4th Class Power Engineering Part B 1&2

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A belt driven lubricator is very popular on a a) reciprocating double acting unit b) screw unit c) rotary lobe unit d) centrifugal unit e) sliding vane unit

A bi-metal thermostat reacts to changes of a) pressure b) flow c) humidity d) heat e) temperature

A bimetal thermostat's operating range is between: Choose one answer. a. 5 and 40°C b. 0 and 50°C c. 0 and 40°C d. 10 and 32°C e. 50 and 90°C

A black light crack detection utilizes ultraviolet light and a) iridescent powder b) an infrared solution c) a radium solution d) fluorescent penetrant e) opaque dye

A substance which will absorb humidity inside a boiler during dry lay up is a) zeolite b) sodium sulphite c) sodium chloride d) activated alumina e) lime soda

A system consists of two finned tube heat ex-changers. Where is the preconditioning coil of this system located? a) On the suction side of the pump b) On the discharge side of the 3-way mixing valve c) In the duct work handling the ventilation into the process d) At the end of the charging unit e) In the duct work handling exhaust air

A system of regularly scheduled inspections and lubrication along with the adjustments, minor parts replacement and minor repairs necessary to keep the refrigerating plant and equipment in good operating condition is defined as a) preventative maintenance b) safety controls c) routing operation d) regular maintenance e) none of the above

Absolute or specific humidity is a) the actual mass of moisture present in a specific amount of air b) the maximum mass of moisture that a specific amount of air can hold c) the ratio of the mass of moisture contained in a specific amount of air to the maximum amount of moisture this specific amount of air can contain d) the mass of moisture present in a specific amount of air at that absolute temperature e) a specific amount of air saturated with moisture

Cross contamination is a disadvantage for which of the following systems? a) A runaround system b) A heat pipe c) A heat tube d) A thermal wheel e) A heat valve

In order to check the trueness of a flat surface, one would use a a) Venire caliper b) hermaphrodite divider c) surface plate d) layout bench e) machinists square

The automatic shutdown devices on a hot oil system are called a) interlocks b) locksmiths c) fail safe locks d) lock-ups e) circuit breakers

Safe practice in rigging, when calculating weight of objects, should be accurate within plus or minus __________ for light objects. a) 5% b) 15% c) 20% d) 25% e) 33%

Safety controls serve what function? a) They stop operation if the temperature gets too high. b) They stop operation when the pressure gets too high. c) They stop operation when the pressure is too low. d) They stop operation when the temperature is too low. e) All of the above

Sectional cast-iron boiler sections are connected with a) push nipples b) tie rods c) victaulic couplings d) unions

Taper, plug, and bottoming are types of a) wrenches b) dies c) files d) punches e) taps

Temperature relief devices are effective in eliminating the following problem: a) scale build-up in the system b) flashing of water into steam when faucets are opened c) venting off air released from water during heating d) inadequate heating of the water e) water stagnation

Voltage is a) the rate of current flow b) the rate of electron flow c) electromotive force d) the rate of Ohm flow e) required for current resistance

An excessive rise in stack temperature can be caused by: a. Heavy scale build up b. Too much cold air in the furnace c. High solid content in the fuel d. Over pressurization

Another name for a unit ventilator is: Choose one answer. a. Radiator b. Exhauster c. Convector d. Register e. Univent

Apparent power is the power a) used for the actual work b) generated by rotating equipment c) supplied by the utility d) caused by system capacitance e) resulting from system inductance

Compound motors combine the characteristics of shunt and ______________ motors, as desired by the designer. a) AC b DC c) parallel d) series e) three phase

"An HVAC system that provides cooling and heating all year round is highly energy efficient but has a high initial cost. The system consists of two separate supply and return piping systems that are connected to separate coils". Which of the following systems fits the above description? Choose one answer. a. A single pipe system b. A four-pipe system c. A Hydronic heat pump system d. A three-pipe system e. A two-pipe system

"Barking", as it occurs in a pulp mill, means: Choose one answer. a. To wash the incoming logs b. To chip the logs c. To store the logs d. The removal of bark from the logs e. Cutting the logs into short lengths

"Free Cooling," with regard to HVAC system operation, refers to Choose one answer. a. Recycling of 100% return air to minimize cooling and dehumidification b. Manipulating mixed air dampers on cooler days to eliminate the need for mechanical cooling c. Manipulating mixed air dampers on warmer days to reduce the amount of mechanical cooling needed d. Using a low-temperature thermal mass to provide cooling during peak demand periods e. Using air washers to cool and dehumidify the air.

A "control" should be considered as a special device which a) sends or transmits a positive rather than negative signal b) tries to maintain a set point c) is a logic device capable of making decisions d) notifies operators of errors or faults in a system e) leaves a hard-copy record of a system's performance

A 300 mm tungsten hacksaw blade with a .78 mm teeth pitch is used to cut a) a brass shaft 25 mm diameter b) 38 mm x 39 mm hardwood c) ceramic materials d) PVC pipe e) thin wall tubing

A 6 pole alternator producing 60 Hz power must turn at a) 1800 rpm b) 2400 rpm c) 1000 rpm d) 1200 rpm e) 600 rpm

A Bourbon tube is often in the shape of a spiral so that a) its final output has less travel b) gears can be used for final output c) higher pressures can be sensed d) more power and travel of the output occurs e) its sensitivity will be decreased

A CRT trend display: Choose one answer. a. Mimics a trend chart. b. Is dedicated to a single process. c. Is limited to displaying a fixed or nonadjustable time period. d. Allows a view of only one process variable at a time. e. Is normally mounted beside the final control element.

A _____ saw consists of as many as 40 parallel saws arranged in a movable sash mounted in a heavy steel frame. Choose one answer. a. Chain b. Band c. Gang d. Hand e. Deck

A _____ system uses a thermal fluid in place of steam or water, to conduct heat from a central source to other vessels and heating coils in a plant. Choose one answer. a. Low temperature heating b. Condensing c. Closed d. Hot oil e. Distillation

A ball peen hammer is sometimes referred to as a: Choose one answer. a. Carpenter's hammer b. Machinist's hammer c. Mechanic's hammer d. Millwright's hammer e. Spherical mallet

A basic law of electricity is, unlike charges attract each other and like charges a) repel each other b) hold each other c) attract each other d) are neutralized e) reduce power output

A boiler circulating pump gland should have some leakage a) to prevent the packing from drying out b) so that the shaft sleeve will take the wear c) in order for the stuffing box to run at the desired high temperature d) so the operator can tell when the pump becomes vapour-bound e) in order to keep the motor amperage down

A boiler control transfer or selector station a) can be used to manually override automatic control loops b) can be changed from manual to automatic without balancing c) is located upstream of the controller in a control loop d) output is directed to the primary element of a loop e) must be operated in manual mode for only short periods

A boiler feed water stop valve: Choose one answer. a. Should never be used to control water level b. Is used to isolate the deaerator c. Must be a globe valve d. Should be located close to the feedwater pump e. May be a globe valve, provided water enters below the disc

A boiler feedwater stop valve: Choose one answer. a. Should never be used to control water level b. Is used to isolate the deaerator c. Must be a globe valve d. Should be located close to the feedwater pump e. May be a globe valve, provided water enters below the disc

A boiler inspection a) must be done after every shut down of the boiler b) must be done when the boiler inspector requests it c) must be done every two years d) is done with the owner's permission only e) must be done before the boiler is ready for start-up

A buried ventilation system leading from a fume hood in a chemistry lab would have ducts constructed of Choose one answer. a. Galvanized steel sheet metal b. Aluminum sheet metal c. Cement asbestos d. Black steel sheet metal e. Fiberglass

A cast-iron boiler advantage is a) its high factor of brittleness b) light weight resulting in lesser foundation requirements c) its ability to withstand high pressure d) the choice of assembly location e) their large capacity

A centrifugal compressor refrigerating system can be stopped simply by pressing the stop button unless which of the following circumstances is true? a) The system is automatically controlled. b) The system's auxiliary equipment is not electrically interlocked. c) The system's auxiliary equipment can be stopped simultaneously. d) The compressor can be shut down at the same time as the other equipment. e) None of the above

A centrifugal pump consists of a) an impeller surrounded by a casing b) a piston moving to and fro in a cylinder c) gears rotating in a housing d) sliding vanes e) pulsating disc

A collet is a) a type of hole punch b) used to make a square hole in a piece of plate c) the moving part of a micrometer d) a type of face spanner wrench e) a holder for a thread die

A chemical dot placed under the glass lens of a sight glass which is exposed to the liquid serves what function? a) To monitor liquid flow b) To monitor refrigerant levels c) To monitor the presence of moisture d) To monitor the presence of foreign particles e) To monitor the pressure levels

A chemical method used in boiler cleaning and treatment which requires vigilant control and monitoring is: Choose one answer. a. Chelates b. Trisodium phosphate c. Sodium hydroxide d. Caustic soda e. Hydrazine

A chromatograph uses electric devices which a) utilized electrical current as a measurement base b) have decreased resistance as temperature rises c) increase in resistance as temperature rises d) work in conjunction with a thermocouple e) are made of chromel and alumel

A chromatograph uses electronic devices which a) utilize electrical current as a measurement base b) have inverse resistance properties relative to temperature c) increase in resistance as temperature rises d) work in conjunction with a thermocouple e) are made of chromel and alumel

A circular chart recorder: Choose one answer. a. Provides a different function than a strip chart. b. Is newer design than a strip chart. c. May incorporate a bourdon tube. d. Does not provide a permanent record. e. Is used on a computer screen.

A circulating pump is usually a) connected with some type of heat ex-changer system b) a once through device c) mounted to the piping d) a small capacity unit e) a high head unit

A clamp-on ammeter measures current flow by using a) differential voltage b) differential current flow between two conductors c) a basic transformer principle d) a portion of circuit resistance e) electromagnetism

A closed electrical circuit will a) not allow current to flow b) contain an open switch or relay contact c) be series only d) be parallel only e) allow current to flow

A closed expansion tank is often equipped with: Choose one answer. a. A gauge glass b. A pressure relief valve c. An automatic fill valve d. A circulating pump e. A thermometer

A closed type expansion tank in a hot water heating system must: Choose one answer. a. Be full of water at all times b. Have a vent open to atmosphere at all times c. Be located three meters above the boiler d. Be located no higher than the top of the boiler e. Be partially filled with air at all times

A collar thrust bearing a) must have a shiny surface b) can support more load than a michell thrust bearing c) is an anti-friction type bearing d) is used with steam turbines only e) has boundary lubrication

A collar thrust bearing: 1. can support more load than a Michel thrust bearing 2. can prevent a rotating shaft from moving in both axial directions 3. has boundary lubrication 4. is an anti-friction type bearing a) 1,2 b) 2,3 c) 3,4 d) 2,4 e) 3,4

A shunt type DC generator has __________ output voltage. a) very high b) nearly constant c) very low d) erratic e) smooth

A combined steam and gas turbine arrangement can be termed a) an ideal system b) a co-generation system c) a once through system d) ideal relative to system efficiency e) a high capacity system

A combustion air proving switch a) senses O content of the air 2 b) senses flue gas pressure c) detects O in flue gas 2 d) senses wind box pressure e) senses air temperature

A combustion air proving switch a) senses O2 content of the air b) senses flue gas pressure c) detects O2 in flue gas d) senses windbox pressure e) senses air temperature

A control valve that has one plug that moves upward to close the port is called: Choose one answer. a. Reverse acting single ported. b. Double seated direct acting. c. Reverse acting diaphragm actuated. d. Direct acting single ported. e. A solenoid

A controlled amount of high temperature, high pressure liquid refrigerant: Choose one answer. a. Passes through the regulating valve to the evaporator b. Passes through the regulating valve to the liquid receiver c. Passes through the compressor to the condenser d. Evaporates in the evaporator, leaving mostly refrigerant liquid at the evaporator outlet e. Occurs in isoenthalpic systems

A controller is a device that primarily: Choose one answer. a. Sends or transmits a positive rather than negative signal b. Tries to maintain a set point c. Records a system's performance d. Notifies operators of errors or faults in a system e. Is a logic device capable of making decisions

A cooling tower which requires neither fan nor fill is the a) natural draft unit b) counter flow induced unit c) venturi unit d) cross flow unit e) forced draft unit

A current carrying conductor being moved by a magnetic field is the principle known as a) magnetic flux b) electrolysis c) hydro-electrics d) generator action e) motor action

A disadvantage of a cast iron boiler is: Choose one answer. a. It is subject to corrosion b. Its difficult assembly c. Its extremely high cost d. Its efficiency e. Its pressure limitations

A disadvantage of the atomizing humidifier is a) it has a lower humidification rate than the pan type humidifier b) its evaporation plates clog up due to the salt left behind after evaporation c) it can be used only as an individual area or room humidifier d) its evaporation plates have to be replaced regularly e) the salts that were in the water before atomization and evaporation settle as white dust in rooms and ducts

A file which is always single cut is the a) hand file b) mill file c) warding file d) knife file e) pillar file

A float operated level control: Choose one answer. a. Will recognize swell and shrinkage and correct the feed water flow b. Will have the float in the boiler drum c. Is only used on small boilers d. Is used on fire tube boilers only e. Must be used when a boiler is manually operated

A float operated low water fuel cutoff has its switch separated from boiler pressure by: Choose one answer. a. A float cage b. A seal cage c. A flexible diaphragm d. A siphon e. Packing

A float operated low-water fuel cutoff has its switch separated from boiler pressure by a) a float cage b) a mercury envelope c) a flexible diaphragm d) a siphon e) packing

A form of lubrication which requires continual motion of a shaft or surface is a) boundary lubrication b) alemite fitting lubrication c) forced lubrication d) zerk fitting lubrication e) fluid film lubrication

A globe valve should be used in the feedwater line: Choose one answer. a. At all times b. Whenever it may be used for throttling purposes c. Only if it is of the outside screw and yoke type d. When the system is of multi-boiler installation e. Because of its low resistance to flow

A government agency which covers several aspects of work platforms is the a) Boilers and Pressure Vessels Branch b) Workers' Compensation Board Accident Prevention Regulations c) Hoisting and Rigging Regulations d) Industrial Accident Prevention Association e) Hoisting and Elevator Regulations

A gradual increase in stack temperature is an indication of: Choose one answer. a. Correct burner operation b. Poor operator skill c. A defective stack thermometer d. Boiler corrosion e. Unclean heating surfaces

A high flash point in oil reduces the risk of a) pump cavitation b) condensation c) vapour bubble formation d) heat transfer e) fire

A high gas pressure fuel cut-off switch: Choose one answer. a. Closes when gas pressure is too high b. Automatically resets itself when the gas pressure is restored c. Is located upstream of the automatic fuel valve d. Is a normally open switch e. Prevents excessive fuel pressure from creating an unstable flame condition

A high limit control switch a) is necessary on all boilers b) activates after the safety valve opens c) is a normally open switch d) usually does not require manual resetting e) must be used when a boiler is not under continuous supervision

A high stack temperature in a hot oil heater is probably an indication of: Choose one answer. a. A ruptured tube b. Too much fuel gas being used c. A poor fuel/air ratio d. Burner failure e. Pump failure

A hot oil pump suction is located a) above the surge tank b) level with the surge tank c) inside the surge tank d) below the surge tank level e) at the side of the tank

A hot water boiler is protected from over pressure by means of a) a safety pop valve b) a high limit pressure control c) an expansion valve d) an air release valve e) a safety relief valve

A hot water boiler low water fuel cutoff: Choose one answer. a. Should be tested weekly during routine boiler operation b. Cannot be tested during routine boiler operation c. Cannot be tested d. Must be located at the lowest permissible water level e. Must have a normally closed switch

A hydrostatic test on a high pressure steam boiler a) must be done on a new boiler b) must only be done by the inspector c) will test the high pressure steam fuel cut-off d) should be done with the Chief Engineer present e) must be done before start-up of a boiler

A hydrostatic test should be applied to a boiler: Choose one answer. a. At the request of the boiler inspector b. Once per year c. Once per week d. Every shift e. At the request of the owner

A journal bearing a) controls thrust movement b) does not require lubrication c) improves suction pressure d) does not require a housing e) supports a shaft

A kilowatt hour meter has a small motor which a) turns at a constant speed b) slows down as power consumption increases c) has a speed proportional to power consumption d) moves the meter demand pointer e) indicates the multiplier to be used when reading the meter

A kitchen exhaust fan reduces the calculated heat gain from the cooking appliances it serves, by a factor of Choose one answer. a. 10% b. 25% c. 50% d. 60% e. 75%

A material that conducts electrical current is called a) a volt b) a conductor c) a circuit d) an electromotive force e) a conduit

A packaged tubular steam boiler often has a steel sheathin in front of the water wall tubes due to a) the high radiant energy from the flame b) overheating of the tubing due to poor circulation c) the erosive action of the flame d) the high corrosion action of the combustion process e) the formation of super heated steam in the tubing

A phenomena produced by electronic switch gear which can result in excessively high voltages in transformers are known as a) capacitive reactance b) inductive reactance c) phase lag d) reactive voltage losses e) harmonic distortion

A plugged impeller symptom or result will be a) air leaks in suction line and stuffing boxes b) wrong direction of rotation c) loss of prime d) an overheated stuffing box e) no liquid being delivered

A pneumatic control system a) uses a sensing device to change pressures in the control line b) requires an intermittent air supply c) always uses pressure actuated final controlled devices d) is not used to control air flow for ventilation e) is seldom used to control humidity

A pneumatic relay can also be called a a) selector switch b) air reservoir c) bleed type controller d) cumulator e) pneumatic-electric switch

A pneumatically actuated control valve which opens on air failure has a: Choose one answer. a. Direct acting actuator and direct acting valve. b. Direct acting actuator and reverse acting valve. c. Reverse acting actuator and direct acting valve. d. Is typically used for a burner firing rate control valve e. Is typically used for a feedwater control valve

A positive displacement stand by-pump will have a) the vent and drain valves open b) the suction valve closed and the discharge valve open c) the suction valve open and the discharge closed d) the suction valve open and the discharge valve open e) the suction valve and the discharge valves closed

A potentiometer control a) varies electrical current to a modutrol motor b) will start and stop a boiler c) cannot have its settings adjusted d) eliminates the need for a high limit control e) will not result in simultaneous adjustment of air and fuel

A power meter a) reads the actual power consumed b) does not require a multiplying factor c) reads only a small percentage of the actual load d) will calculate the actual cost of the power e) does not take into account the system voltage

A process computer connected to digital inputs is protected from harmful voltages by means of: Choose one answer. a. Splitter bars b. Fuses c. Isolating circuits d. Circuit breakers e. Stand-alone devices

A refrigeration system used in HVAC service, that can provide both heating and cooling, is a Choose one answer. a. Run around system b. Heat valve c. Heat pump d. Regenerative system e. Thermal wheel

A relief valve is placed on the discharge of a fuel oil pump a) because the pump is a dynamic type b) so burner design pressure is not exceeded c) so burner capacity is maintained d) to prevent pump rupture e) to prevent over-firing of the boiler

A resistance control or "potentiometer" for modulating control a) works in conjunction with a modutrol motor b) utilizes a mercury switch c) senses steam temperature d) can only be used on a fully automatic boiler e) can operate only in the vertical position

A rheostat is also known as a a) voltage regulator b) resistance regulator c) current controller d) variable resistor e) flux field regulator

A rheostat is used to __ the field strength in a DC machine. a) stop b) make c) heat d) vary e) remove

A rheostat or "voltage regulator" of a DC shunt wound generator is used to a) regulate the strength of the electromagnetic field b) regulate the speed of the generator c) regulate the current to the load d) change the AC to DC e) change the unit into a DC motor

A room thermostat should be mounted on an inside wall about _____ above the floor. Choose one answer. a. 0.5 m b. 0.75 m c. 1.0 m d. 1.25 m e. 1.5 m

A rotary pump a) is a variety of dynamic unit b) never has discharge pulsations c) should be equipped with a relief valve d) has the highest capacity of any pump e) never requires cylinder lubrication

A scaffold should always be erected a) by the user only b) plumb c) by a contractor d) plumb and level e) level

A simple trap located in the suction line before the compressor that collects liquid, where it evaporates and returns to the compressor as a gas, is called a) an oil separator b) a strainer-drier c) a distributor d) an accumulator e) a stop valve

A single pole scaffold a) should not be used b) must be constructed of metal only c) is partially supported by a building d) must have supporting rigging attached to it e) need not be plumb, only level

A slight leakage is desired between the pump shaft and packing of the majority of pumps in order to a) prevent the ingress of atmospheric air b) increase the pump capacity and efficiency c) prevent wearing of the wear rings d) lubricate the surfaces e) prevent the pump from vapor locking

A small residence located in a tropical climate may require which of the following elements of an air conditioning system: i) heating ii) cooling iii) humidification iv) dehumidification v) ventilation a) i and ii b) i, iii, and v c) ii and iii d) iv and v e) ii, iv, and v

A stationary crankshaft seal used on refrigeration compressors, which consists of a metallic bellows soldered at one end to a ring, and which presses against a shoulder on the shaft is called a: Choose one answer. a. Packing gland seal b. Diaphragm seal c. Bellows seal d. Rotating Mechanical seal e. Set screw

A steam boiler is blown down to a) discharge sediment and scale forming matter from the boiler b) clean the soot and carbon out of the fire box and tubes c) lower the operating water level in the boiler d) test the rated relieving capacity of the safety valves fitted to the boiler

A steam boiler is regularly blown off in order to: Choose one answer. a. Clean the soot and carbon out of the firebox and tubes b. Lower the operating water level in the boiler c. Discharge sediment and scale forming matter from the boiler d. Test the rated relieving capacity of the safety valves fitted to the boiler e. Restore the drum level

A test lead or "jumper wire" is required when testing: Choose one answer. a. High steam pressure or high water temperature limit controls b. A high gas pressure fuel cut-off switch c. A safety valve with the test lever d. The low water fuel cut-off switch e. A low gas pressure fuel cut-off

A thermal element is a) used to measure pressure b) capable of sensing temperature and converting it to a pressure signal c) a type of open system d) used to measure heat content e) commonly termed an "aquastat"

A thermo hydraulic feed water regulator uses _____ as operating media. Choose one answer. a. Oil and nitrogen b. CO2 and water c. Water and steam d. Mercury and water e. Air and water

A thermocouple: Choose one answer. a. Consists of two similar wires b. Produces an electric signal c. Senses infrared light from the flame d. Is made of several thermopiles connected in series e. Is also called a "pilot-stat"

A two cycle gasoline engine a) has more moving parts than a four cycle b) produces twice as much power as a four cycle c) must have two cylinders d) does not require exhaust valves e) is of more simple construction than a four cycle

A two shaft gas turbine a) has the load turbine downstream from the compressor turbine b) has the first turbine drive the prop on a turbo-prop engine c) is always an open cycle type d) is always a closed cycle type e) does not require a starting motor

A two-position controller compares conditions to a set point and a) will start or stop a process b) desired value c) will modulate the final element d) can automatically readjust the set point e) will maintain final element position at 50%

A type of anti-friction bearing is the __________ bearing. a) spiral b) elliptical c) ball d) sleeve e) journal

A type of directly fired space heater is a) a unit heater b) a floor furnace c) a wall furnace d) all of the above e) none of the above

Activated carbon will absorb odours and objectionable gases by up to _____ of its own weight before requiring replacement. Choose one answer. a. 10% b. 20% c. 30% d. 40% e. 50%

Actual ventilation rates may vary per person from: Choose one answer. a. 0.5 m3/sec to 0.6 m3/sec b. 0.5 m3/min to 0.75 m3/min c. 0.2 m3/m to 1.2 m3/min d. 0.14 m3/min to 1.5 m3/min e. 1.0 m3/hour to 1.5 m3/hour

Advantages of the centrifugal compressor are? a. No moving parts b. Can be coupled to an electric motor c. Cheap d. A and B e. All of the above

Advantages of the high temperature hot water systems are: Choose one answer. a. Reduction in pipe size and greater heat storage capacity b. Low water make-up and better temperature control c. High vacuum in the return lines and pumps d. Higher make-up and better chemical control e. High-pressure piping and controls

After a steam heating system has been operating for some time, you notice that some parts of the heating system are still cold. Which one of the following could be the cause of this? Choose one answer. a. Air is trapped in the affected sections b. Boiler water pressure too low c. Boiler water temperature too low d. Steam does not contain enough heat e. Condensate temperature too low

Air can be removed from steam heating systems by a) air vents b) a steam trap c) an air separator d) an air header e) a dip tube

Air compressor oil should a) have a very low viscosity b) have low carbon residue c) have a low flash point d) not contain anti-oxidants e) have high shock absorption characteristics

All absorption refrigeration systems must be purged of: Choose one answer. a. Condensable gases b. Moisture c. Non-condensable gases d. Nitrogen e. Ammonia vapour

All boiler fittings not properly or clearly identified should be: Choose one answer. a. Rejected b. Used for low pressure services only c. First approved for use by the boiler inspector d. Acceptable for most powerhouse applications. e. Sent back to the manufacturer for proper identification.

All flame safeguard devices have the following in common: Choose one answer. a. Close the main fuel valve in case of pilot flame failure or main burner failure. b. Require a visible light source. c. Are limited to temperatures comfortable to the hand. d. Monitor the pilot flame and main burner simultaneously. e. Activate an alarm system if flame failure is detected

All of the primary and secondary is wound on the centre leg. This transformer is called? a) current transformer b) core type transformer c) potential transformer d) shell type transformer e) resistance indicator

Alternators are constructed to use slip rings made of brass or a) copper b) carbon c) mica d) silicon e) steel

Ambient lighting can be improved by two types of lighting: a) direct and indirect b) natural and artificial c) fluorescent and incandescent d) reflective or refractive e) general or local

An advantage of an electronic control system is that: Choose one answer. a. The controllers can accept a wide variety of inputs b. They are inexpensive to operate c. They are inexpensive to install d. The controllers can be used outdoors e. It is very compact

An advantage of having an alternator with a rotating field is, that the size of the rotating mass is a) constant b) increased c) reduced d) removed e) easily heated

An advantage of low voltage switching is a) that local and remote control of lights is permitted b) the wiring does not require conduits c) changes are simple and economical d) a and b are correct e) a, b and c are correct

An agency or code with which fittings must comply is: Choose one answer. a. Health and Safety Code b. Fittings and Boiler Parts Act c. Boiler Repair Code d. Plumbing Gas Act e. ASME Code

An air atomizing compressor is usually a) a variable displacement type b) a centrifugal type c) an axial type d) a positive displacement type e) a regenerative type

An air compressor auxiliary which will decrease the power requirement is the a) receiver b) diffuser c) intercooler d) variable compression ratio head e) aftercooler

An air compressor which gives two compression strokes per crankshaft revolution is a) multi-staged two cylinder b) multi-cylinder single acting c) single cylinder double acting d) a compound unit e) single acting

An air receiver used in an air compression, system will perform the following functions: a)1. act as a storage vessel b)2. eliminates pulsation in discharge lines c)3. will separate out water from the air d)4. controls the temperature of the air before it enters the system e) 1,2,3

An air separator should always be installed in a) a horizontal pipe b) a cross tee c) a vertical pipe d) an expansion tank e) a converter

An air separator should always be installed in: Choose one answer. a. A horizontal pipe b. A cross tee c. A vertical pipe d. An expansion tank e. A converter

An altitude gauge on a hot water heating boiler is used to indicate: Choose one answer. a. Expansion tank temperature b. Boiler temperature c. Furnace draft d. The highest level of water in the system e. The height of the boiler

An ampere is the ___ of current flow. a) cause b) resistance c) measurement d) cause of reduction e) cause of increase

An analog control loop output must be put through a _____ before the computer can react to the signal. Choose one answer. a. Digital converter b. Signal inverter c. ROM detector d. Modem e. CPU

An anti-friction bearing a) could be a thrust bearing b) is a bearing containing white-metal alloy c) is a sleeve bearing d) receives larger amounts of oil e) cannot operate in an oil bath

An aquastat a) senses water level b) is like a thermal element without a capillary tube c) can be located away from its point of measurement d) measures water flow e) is a modulating device

An atomizing air compressor is usually: Choose one answer. a. A variable displacement type b. A centrifugal type c. An axial type d. A small, rotary air compressor e. A regenerative type

An automatic boiler On-Off or operating control switch has an adjustment for pressure set-point and another for: Choose one answer. a. A differential between the two b. Manual or automatic control c. For rate of modulation d. High steam pressure limit e. Rate of feedback

An average effective temperature chart can be applicable under the following conditions except when a) customary indoor clothing is worn b) the heating method is warm air c) activity is high or heavy muscular work is being done d) the heating method is steam e) the heating method is hot water

An electric boiler feedwater valve will: Choose one answer. a. Eliminate the need for a second low-water fuel cutoff b. Prevent low-water conditions c. Open before the low-water cutoff operates d. Require manual action to open e. Open if the boiler trips due to low water

An electrical device which is designed to start and stop current flow is the a) potentiometer b) fuse c) circuit breaker d) switch e) resistor

An electrical distribution system is composed of service, feeders and a) secondary circuits b) primary circuits c) branch circuits d) trunk circuits e) tertiary circuits

An electronic control system is comprised of a a) meter, sensor, and valve b) sensor, controller, and final control element c) sensor, transmitter, and thermostat d) controller, thermostat, and sensor e) thermostat, electronic controls, and furnace

An increase in air flow increases heat loss of the body by which of the following methods: Choose one answer. a. Convection and Conduction only b. Conduction only c. Evaporation and Convection only d. Radiation, Evaporation, and Convection e. Conduction, Convection, and Evaporation

At the end of the pre-purge period, the combustion programmer: Choose one answer. a. Shuts down b. Opens the main fuel valve c. Closes the pilot valve d. Ends the ignition trial e. Energizes the ignition transformer

Atomizing humidifiers a) break up the water for humidification into small particles by either a spinning disc or spray nozzle and are placed either in the warm air supply duct or in the area to be humidified b) spray water through plates to atomize the water c) spray water through rotating pads to atomize the water d) can be either the power type or the bypass type e) have a lower humidification rate than the pan type humidifiers

Atoms that have greater numbers of electrons in the outer shell are: Choose one answer. a. Positively charged b. Good conductors c. Poor insulators d. Neutrally charged e. Poor conductors

Automatic boiler liquid fuel manual valves should be opened a) prior to pre-purging b) after pre-purge and just prior to pilot ignition c) immediately after completion of the pilot flame trial d) after the automatic main burner fuel valve opens e) with the automatic main burner fuel valve

Axial flow fans a) have maximum horsepower requirements at maximum or free air delivery b) have minimum horsepower at maximum or free air delivery c) are quieter than centrifugal fans d) are the least economical fans used to produce high capacity, low pressure air movements e) are not the logical choice to move large volumes of air at low pressures

Axial flow fans are classified as a) centrifugal and propeller b) vane axial and centrifugal c) tube axial and rotary positive displacement d) vane axial, tube axial, and propeller e) centrifugal and turbine

Backward inclined centrifugal fans a) are noisier than forward curved fans b) are quieter than forward curved fans c) are less efficient than forward curved fans d) operate at lower speeds than forward curved fans e) require more horsepower than the forward curved fans to deliver a specified volume of air

Before starting up a new boiler or one that has been out of service the following must be ensured: Choose one answer. a. The manufacturer's recommendations are read b. The boiler has a valid inspection certificate c. The fuel is shut off d. The boiler control is in the off position e. The boiler is col

Castle nuts are used a) to lock the bolt in place b) to hold shims in place c) with a square pin d) for locking square nuts in place e) with a split pin or cutter pin

Causes of anti-friction bearing failures are: 1. improper fitting 2. false brinelling 3. high operating temperature 4. poor quality lubricant a) 123 b) 134 c) 234 d) 134 e) all of the above

Cavitation of a pump refers to, when: a) the pump is filled with air b) the pump is filled with vapor c) the oil ring is damaged d) the suction valve is open e) the pump is steam driven

Centrifugal fans are classified as a) backward inclined b) straight c) backward inclined with airfoil blades d) forward curved e) all of the above

Checking the condition of electrical starters and contactors is categorized under which of the following maintenance schedules? a) Daily maintenance b) Weekly maintenance c) Monthly maintenance d) Semi-annual Maintenance e) Annual maintenance

Chemical cleaning of smaller boilers is not usually done because a) of the small surface area which the chemical contacts b) of the thin metal of which they are manufactured c) they do not have adequate support for the high density of the chemicals d) it is impossible to get the chemical circulating adequately e) the cost to do so is not warranted or justified

Choose the true statement. The economiser of a packaged water chiller, used for air conditioning, does NOT Choose one answer. a. Have an intercooling effect on the compressor b. Reduce the power required for compression of the refrigerant c. Reduce the flash vapour in the evaporator d. Increase the refrigerating capacity of a system e. Eliminate liquid carryover to the compressor

Coke deposits on the inner walls of a heater tube produce __________ when the tube is tapped lightly with a hammer? a) a clear ringing tone b) a dull sound c) chimes d) a vibrating sound e) a whistling sound

Coking of the oil in hot oil heater tubes will begin to occur if: Choose one answer. a. The oil becomes too thick b. There is too much water in the oil c. The oil temperature becomes excessively high d. The oil flow becomes excessively high e. The surge tank level becomes low

Combustion air safety switches are commonly found a) on natural draft boilers b) on hot water boilers only c) on boilers utilizing a forced draft fan d) on gas fired boilers only e) as noninterlocking devices and take no part in a startup

Dalton's Law of partial pressure states that a) for every pressure there is an equal and opposite pressure b) in a mixture of two or more gases each will exert a partial pressure which is equal to the pressure that it would exert if it filled that space alone c) the pressure exerted by two or more gases on the walls of the containing vessel is equal to a constant d) the sum of the mass of air and water vapour in a vessel is equal to the total pressure e) water vapour must be included when calculating air pressures

Damaged tools a) are best disposed of or properly repaired b) must be used carefully and cautiously if injury is to be prevented c) should be kept in a special tool box d) should be of no concern to the user e) should be replaced under their "Lifetime" warranty

Dew point can be best defined as the: Choose one answer. a. Absolute temperature at which air, upon heating, will evaporate moisture b. Percentage of moisture that air can hold at a given temperature and pressure c. Temperature that air will begin to evaporate moisture d. Temperature at which air, upon cooling, becomes saturated, causing moisture to condense should the temperature drop further e. Atmospheric pressure at which air will condense moisture

Dewpoint can be best defined as a) the absolute temperature at which air, upon heating, will evaporate moisture b) the absolute temperature at which air, upon cooling, will vaporize moisture c) the temperature that air will begin to evaporate moisture d) the atmospheric pressure at which air will condense moisture e) the temperature at which air, upon cooling, becomes saturated and will begin to condense out water vapour below this temperature

Diesel engine governing is accomplished by a) varying the fuel quality b) carburetor c) varying the fuel quantity d) fuel atomizing air quantity e) fuel atomizing air pressure

Digital output signals are processed by _____ before an analog controls can react to them. Choose one answer. a. Digital receivers b. Logic controllers c. Modems d. Analog converters e. Integrated circuits

Direct lighting systems a) have a higher initial cost than indirect lighting b) have greater glare control c) are more energy efficient than indirect lighting d) produce shadow free light e) blend with the environment

Dissolved oxygen in condensate: Choose one answer. a. Will cause pitting in a boiler b. Can cause pitting on the return lines c. Causes grooving of the condensate lines d. Is removed with amines e. Necessitates the installation of a deaerator

Diverter fittings are used in the supply lines to heating units a) to compensate for a low heating load b) when a higher heating output is required from the heating unit c) when the distance from the boiler to heating unit is short d) when there are no balancing valves installed in the supply line e) when a hydraulic balance must be corrected

Drain traps serve which of the following purposes: i) to seal the outlet fixture ii) to prevent back flow of sewer gas iii) to deflect grease and oil for separate disposal a) ii) only b) i) only c) both i) and iii) d) both i) and ii) e) i), ii) and iii)

Dry and flooded evaporators differ principally in what respect? Choose one answer. a. The dry evaporator is designed to cool gases only b. The heat transfer surfaces of a flooded evaporator are kept covered with liquid refrigerant c. Flooded systems primarily use B1 and B2 refrigerants d. Dry evaporators use low-side floats, whereas flooded evaporators use high-side floats e. The drift eliminators in a dry evaporator are considerably smaller

Dry-bulb temperature is a) the absolute temperature corresponding to the atmospheric pressure b) the dewpoint temperature c) not required to find the relative humidity d) the temperature of the air measured with an ordinary thermometer e) the same as the wet-bulb temperature if the relative humidity is less than 100%

Duct liners a) eliminate corrosion b) reduce the noise level of air flowing in the duct system c) reduce fire hazard d) increase erosion to the duct e) increase the pressure

Ducts are fabricated of a) sheet metal b) cement asbestos c) plastic d) fibre glass e) all of the above

Ducts of large dimensions must be diagonally creased to a) provide stiffness b) allow gradual duct size change c) decrease duct weight d) increase air velocity e) decrease air friction in the duct work

During a programmed start-up if an igniter spark is visible but no flame appears the operator should suspect a) a boiler low water level b) the main burner manual fuel valve is closed c) the pilot manual fuel valve is closed d) the scanner lead sulphide cell is weak e) the boiler steam pressure operating control switch is open

During a wet layup, a water tank should be installed above the boiler and attached to the vent connection in order to: Choose one answer. a. Permit the injection of chemicals b. Prevent air from entering the boiler when the water contracts c. Hold the manway doors closed d. Prevent water vapour from entering the power plant e. Prevent chemical wastage

During seasonal startup, when should the purge pump be started? a) Simultaneously with the absorption unit b) One half hour before the absorption unit is started c) At least 24 hours after the compressor is started d) About one half hour after the absorption unit is started

During sensible heating the dry-bulb temperature and the wet-bulb temperature are raised, and a) the dewpoint remains unchanged b) the specific humidity is increased c) the specific humidity is decreased d) the dewpoint temperature increases e) the dewpoint temperature decreases

Effective temperature is defined as a measure of comfort that involves: Choose one answer. a. The effects of relative humidity only b. The effects of air movement and wet-bulb temperature c. The effects of dry bulb temperature and dew-point d. The effects of wet bulb temperature, dry bulb temperature, and relative humidity e. The effects of air movement, dry bulb temperature, and relative humidity

Electric motors give off _________ while running. a) sensible heat b) latent heat c) latent and sensible heat d) no heat to the atmosphere e) solar heat

Electrical power can be determined by the formula a) P = IE b) I = ER c) E = IR d) R = EI e) P = IR

Equalizing lines on a condensate receiver float chamber a) will dampen level fluctuations b) keep receiver level equal to boiler level c) maintain make-up flow equal to condensate flow d) eliminate the need for a make-up level control valve e) maintains equal flow of condensate to multiple boilers

Equivalent resistance is decreased a) when voltage is decreased b) when a circuit is in parallel c) if the amperage is increased d) when a circuit is in series e) when a circuit is opened

Evaporative condenser can save up to __ to __ percent in water consumption a. 50 to 60 b. 60 to 70 c. 70 to 80 d. 80 to 90

Face velocity is the a) velocity of the supply water to the coil b) velocity of the air before it enters the coil c) velocity of the air after it leaves the coil d) average velocity of the air flowing over the face area of the fin surface e) velocity of the return water from the coil

Faraday discovered a) the Right Hand Rule for conductors b) that a conductor will have a voltage induced if it cuts magnetic flux c) the Left Hand Rule for motors d) the Right Hand Rule for generators e) that current flows from positive to negative

Fibre glass ducts are used a) in high pressure systems b) to handle air with high moisture levels or oil and grease c) where its heavy weight is not a problem d) where high strength is required e) in some low pressure systems

Fin spacing of 6.35 to 1.814 mm is most normally used in which of the following cases? a) Direct expansion coils for low temperature applications b) Steam and hot water heating coils c) Chilled water cooling coils d) Cooling refrigerant coils e) Refrigerant condenser coils

Fin surface area is called a) primary surface area b) secondary surface area c) tube surface area d) heater surface area e) none of the above

Fin surface area of a heating or cooling coil is called: Choose one answer. a. Primary surface area b. Secondary surface area c. Tube surface area d. Heater surface area e. Radiant heater surface area

For an alkaline boil out, the boiler is maintained at a desired steam pressure for about a) 12 hours b) 8 hours c) 16 hours d) 48 hours e) 24 hours

Functions of terminal air distribution devices are accomplished a) only by diffusion b) only by diffusion and aspiration c) by aspiration, entrainment, induction, and diffusion d) only by entrainment and diffusion e) only by entrainment and aspiration

Furnace heat exchangers should be checked for corrosion because: Choose one answer. a. Carbon monoxide could leak into the building b. The holes reduce the furnace efficiency c. Cold air could leak into the building d. The air will become too dry for comfortable heating e. Too much air would enter the furnace

Gas turbines are very popular where a) noise does not present a problem b) water is scarce c) industrial sites are small and in congested areas d) thermal pollution is of major concern e) natural gas is plentiful

Glass thermometers with a mercury fill are sometimes pressurized with nitrogen so a) that they can be used in a horizontal position b) that they can be used at a very low temperature c) that they can be used at higher temperatures d) the vaporizing temperature of the mercury is lowered e) the mercury level is suppressed

Glycol coils using ethylene glycol a) give reasonable heat transfer efficiency at low glycol velocity b) are not recommended for use in heating and air conditioning systems in the food industry c) use direct fired boilers as their heat source d) do not use steam-glycol converters as their heat source e) are used only for heating purposes and are not used for cooling purposes

Group "A" refrigerants are: Choose one answer. a. Non-flammable b. Low-flammable c. Low-toxic d. Low-toxic and flammable e. High-toxic and flammable

Heat exchangers in modern gas fired furnaces are made of: Choose one answer. a. Brass b. Copper c. Aluminum d. Steel e. Cast iron

Heat gains by conduction are calculated on the assumption that: Choose one answer. a. Solar heat varies from hour to hour as sun changes position b. Solar heat should be considered separately c. Construction details are irrelevant d. The "U" value is not used e. Heat is conducted at the same rate through roofs, walls, and windows.

Heat is lost from a building in the following ways: a) convection, evaporation, and radiation b) infiltration, condensation, and conduction c) evaporation, conduction, and radiation d) conduction, radiation, and convection e) infiltration, evaporation, and convection

Heat load from people in a room is mostly affected by a) the size of the people b) smoking c) the number of people d) the activity of the people e) none of the above

Heat lost from a building is a) dependent on the shape of the openings in a building b) is not affected by wind speed c) affected by wind speed d) independent of outside temperature e) not affected by the density of the air

Heat lost from a building is: Choose one answer. a. Dependent on the shape of the openings in a building b. Independent of indoor air temperature c. Greater on windier days d. Independent of outside temperature e. Dependant on barometric pressure

Heat that causes an increase in temperature, is called _____ heat: Choose one answer. a. Conductive b. Radiant c. Sensible d. Latent e. Convective

Heating boilers attain maximum efficiency only when they are operated: Choose one answer. a. Intermittently at 90% of the load b. Intermittently at half load c. Continuously at full load d. Continuously at half load e. Continuously at 75% of the load

Helical rotors revolve at speeds up to ___ r/min a. 1550 b. 2550 c. 3550 d. 4550 e. 5550

Higher than normal head pressure is undesirable for all of the following reasons except a) it increases power consumption b) it decreases condenser capacity c) it reduces compressor capacity d) it over stresses compressor parts e) it is detrimental to compressor lubrication

Hog fuel is a term used to describe a a) very poor quality of fuel oil used as boiler fuel in sawmills b) mixture of waste wood and bark used as boiler fuel in a sawmill c) low calorific value waste fuel used as boiler fuel in oil refineries d) low calorific value waste fuel used as boiler fuel in meat processing plants e) waste product from hog barns used as boiler fuel in meat processing plants

Hot oil convection heaters have an approximate efficiency of a) 80 - 90 percent b) 55 - 65 percent c) 85 - 95 percent d) 70 - 80 percent e) 75 - 85 percent

Hot oil heaters should be inspected: Choose one answer. a. Every six months b. Annually c. Every two years d. Whenever it is thought necessary e. According to the CSA code

Hot oil high temperature (TSDH1) shutdown switches are installed on a) the fuel gas line b) the inlet line of the oil heater c) the suction line of the pump d) the surge tank suction line e) the outlet line of the heater

Hot spots on the exterior metal covering of a hot oil heater may indicate that: Choose one answer. a. A poor quality of refractory has been used b. The refractory is cracked c. The burners have been operating at too high a temperature d. A more heat-resistant coating must be used on the lagging e. The tubes are leaking

Hot water heating boilers have stop valves in their supply and return piping: Choose one answer. a. To allow for better warm ups b. To prevent water from entering another in-service unit c. So that each boiler can have separate water treatment d. So that the boiler can be drained without draining the system e. To permit annual maintenance

How far from a furnace heater dike is the drain pit located? a) about 75 meters b) about 100 meters c) about 25 meters d) about 40 meters e) about 50 meters

How long should the circulating pump be run to ensure the system is full when filling a hot oil system? a) 1 or 2 hours b) 3 or 4 hours c) 9 or 10 hours d) 12 to 18 hours e) 24 hours

How many blow-off valves does a steam heating boiler require? Choose one answer. a. None b. One c. Two d. Three e. Four

How many pressure relief valves shall a hot water heating boiler have? Choose one answer. a. None b. At least one c. At least two d. At least three e. At least four

How often would you test the low level fuel cut-off on a low pressure steam heating boiler by blowing out the float chamber? Choose one answer. a. Daily b. Monthly c. Semi-annually d. Annually e. Bi-weekly

Hydrocarbons in a natural gas may include a) carbon dioxide b) ethane c) nitrogen d) hydrogen sulphide e) carbonic acid

Humidification in residences equipped with ducted warm air heating systems a) is not necessary because the humidity does not change with heating b) requires separate humidifiers for each heated area c) is accomplished by installing a second heating system, such as hot water d) is supplied sufficiently by normal living processes such as cooking, washing, and breathing e) is provided for by placing a single humidifier in the furnace plenum or in the warm air duct

Humidifying units that use a small fan to draw warmer air from the furnace plenum or from the room force the air through the wetted pad and return the air to the room, are called: Choose one answer. a. Pan type humidifiers with plates b. Atomizing humidifiers c. Bypass type humidifiers d. Power type wetted element humidifiers e. Industrial pan type steam grid humidifiers

Humidity in the air a) increases when the air temperature decreases b) increases when the air pressure decreases c) decreases when the air pressure increases d) decreases when the air temperature decreases e) remains constant with air temperature changes

If 5.0 cubic meters per second of air enters a heating coil at 20°C dry bulb and 15°C wet bulb, and leaves the heating coil at 30°C dry bulb, what is the approximate volume of air leaving the coil? Choose one answer. a. 6 m3/s b. 5 m3/s c. 5.2 m3/s d. 4.2 m3/s e. 5.7 m3/s

If 5.0 cubic meters per second of air enters a heating coil at 20°C dry bulb and 15°C wet bulb, and leaves the heating coil at 30°C dry bulb, what is the change in enthalpy? Choose one answer. a. 52 kJ/kg b. 42 kJ/kg c. 15 kJ/kg d. 20 kJ/kg e. 11 kJ/kg

If Ep/Es = Np/Ns, the Ns will equal: Choose one answer. a. Ep/NpEs b. EpEs/Np c. NpEsEp d. NpEp/Es e. NpEs/E

If a compressor fails to start but the motor is running, which of the following could be a cause? a) The control circuit is open b) The compressor is seized c) The coupling is sheared or broken d) The motor is burned out e) The starter is defective

If a conductor is held stationary and a magnetic field is moved across it, it forms what is known as a) motor action b) electromagnetism c) generator action d) transformer action e) conduction

If a cooled medium had an evaporation temperature of 2 degrees C, the evaporation temperature of the liquid refrigerant should be approximately a) 2 degrees C b) 6 - 8 degrees C c) 1 degree C d) 0 degrees C e) -8 to -3 degrees C

If a hot-water heating boiler has an automatic fill valve, and is requiring a lot of makeup water, this may indicate: Choose one answer. a. The expansion tank is empty. b. There is probably a leak in the system c. There has been a drastic change in the water quality d. The return pumps are not working e. The flow meter is not working properly

If a pump is cavitating what can you do to prevent or reduce the cavitation? a) close the casing vent valve b) open the vent valve and close the suction valve c) partially close the suction valve d) close the discharge valve e) raise the suction pressure

If a pump is running and has no discharge pressure, what will you do? a) close the suction valve a little b) open the lubrication valve c) check the lubricant level d) check to see if the suction valve is open e) close the discharge valve

If a shutdown occurs during normal firing of a boiler and the steam pressure is below the normal cut-out value, the problem could be a) the sensing line to the combustion air proving switch has broken b) main flame trial failure c) pilot flame trial failure d) igniter transformer failure e) high steam pressure limit switch tripped

If a shutdown occurs during normal firing of a boiler and the steam pressure is below the normal cutout value, the problem could be: Choose one answer. a. An interlock, such as the combustion air proving switch, has failed b. Main flame trial failure c. Pilot flame trial failure d. Igniter transformer failure e. High steam pressure limit switch tripped

If a stuffing box is to prevent the ingress of air, it is equipped with a) a vacuum breaker b) a seal cage c) a bushing d) a thrust collar e) an anti-air siphon

If an electrical ____ is placed across a conductor, the electrons will drift from the negative end towards the positive end of the conductor, assuming the electron theory. a) potential b) current c) resistance d) wire e) meter

If an oil's viscosity changes much with little temperature change then it will have a a) low viscosity index b) high pour point c) high carbon residue d) high viscosity index e) low pour point

If crystallization occurs upon shutdown of a lithium bromide absorption system, what is a possible corrective action? Choose one answer. a. Add octal alcohol charge b. Purge the system c. Adjust cooling tower control d. Check the dilution cycle timer for correct operation e. Reduce steam pressure

In a Lithium Bromide System which of the following is the refrigerant? a) Lithium Bromide b) Ammonia c) Freon-22 d) Water e) None of the above

If operating personnel from an old building are going to be transferred to the new building the system installed in the new building will be the same as in the older building because all the personnel are familiar with that system. This type of system selection is based mainly on which of the following factors? a) Building owner's considerations b) Geographical location c) Building layout d) Operating costs e) Maintenance requirements

If possible, you should not work any higher than _____ steps from the top of a ladder. Choose one answer. a. Three b. Two c. One d. Four e. Five

If pump speed is too high a) the driver may be overloaded b) discharge pressure will be below normal c) no liquid will be delivered d) the pump will lose its prime after starting e) there will be air or gas in the liquid

If the applied voltage in a circuit is 120 volts and the current flow is 3 amperes the resistance of this circuit is r = volts/amperes a) 40 Watts b) .025 Ohms c) 360 Ohms d) 40 Ohms e) 25 Watts

If the chilled water temperature drops approximately 2.5-3°C below the chilled water temperature set point, the chilled water low temperature cut out will: Choose one answer. a. Start the compressor b. Shut down the compressor c. Stop the chilled water pumps d. Shut down the cooling tower fan e. Start the condenser pump

If the first column of a refrigeration table lists the saturation temperature of a refrigerant, which column will most likely list the saturation pressure? Choose one answer. a. Column 1 b. Column 2 c. Column 3 d. Column 4 e. Column 5

If the logs coming into a sawmill must be shortened, they are cut with a _____ saw. Choose one answer. a. Chain b. Band c. Gang d. Hand e. Deck

If the low-water fuel cutoff and/or the high limit control are equipped with a trip-out device on a boiler, it is recommended as part of the startup preparation to a) dismantle the device and check for lose wires b) push the reset button to assure that the switches are closed c) check the low-water fuel cutoff and make sure all the mercury switches are working properly d) check that the high limit switches are set high enough e) dismantle the high limit switches and overhaul if necessary

If the secondary voltage is smaller than primary voltage in a transformer. This transformer is called? a) current transformer b) step down transformer c) potential transformer d) step up transformer e) resistance indicator

If there is a crystallization upon shutdown a possible corrective action is to a) add ethyl alcohol charge b) purge the system c) adjust cooling tower control d) check pump operation e) reduce steam pressure

In a glass stem thermometer the space above the liquid is usually a) nitrogen b) argon c) maximum vacuum d) partial vacuum e) approximately 50% air

In a meat processing plant the blast freezer is maintained at a temperature of approximately: Choose one answer. a. 10°C b. -0°C c. -3°C d. -11°C e. -35°C

In a refrigeration system controlled by a high-pressure float valve, excessive refrigerant charge will cause Choose one answer. a. Liquid carry-over to the compressor b. The float chamber to become flooded c. The evaporator to be starved of refrigerant d. Frost formation on the evaporator e. The compressor to run continuously

In a refrigeration system, a weighted valve pin is used in a high-pressure float valve system in order to: Choose one answer. a. Get proper pressure drop into the evaporator b. Reduce frosting of the line immediately after the float valve c. Allow the room temperature to be adjusted d. Act as a pressure relief device e. Prevent flooding of the evaporator

In an HVAC system, to provide a two-position damper with manual proportional control, a/an _________ is required. Choose one answer. a. Gradual switch b. Offset returned air duct c. Air mixer d. Variable air volume box e. Variable frequency motor drive

In calculating air infiltration the quickest method is a) the air change method b) the crack method c) the solar method d) the conduction method e) none of the above

In comparing absorption and compression systems which of the following comparisons is true? a) Pumps in absorption systems require more electrical power. b) Absorption systems require less space than compression systems. c) Cooling water requirements are larger for an absorption system than for a compression system. d) More equipment and piping are required for a compression system. e) Slugs of liquid carried over from the evaporator do not damage the compression system but can ruin an absorption system.

In electric switch configuration the term "contact arrangement refers to: Choose one answer. a. Normally open or normally closed position b. Switches in series or parallel c. Double or single pole switches d. Switches mounted vertically or horizontally e. Relay contacts

In large buildings approximately what percentage of the electrical load is lighting? a) 60% b) 65% c) 70% d) 75% e) 80%

In order to keep rope from untwisting under load a) it should be moistened b) it requires a synthetic binder c) it is made with left- and right-handed counteracting twists d) each end requires "whipping" e) rope thimbles should be used

In order to keep salt concentrations within safe limits the packaged tubular steam boiler utilizes a) an automatic blowdown b) a des-alinator c) a water softener after the condensate receiver d) a mixing chamber before the heating coil e) a liquid flow control device

In radiant heating system changes are a) difficult to make b) easy to make c) as easy to make as in any other heating system d) dependent on availability of materials e) dependent on location

In rotating mechanical seals the sealing ring is held in position by a) a nut, bolt, and washer b) centrifugal force c) oil suction d) high pressure refrigerant vapour e) a spring

In the Lithium Bromide refrigeration system, what is the function of the concentrator (generator)? Choose one answer. a. To exchange heat between the high temperature refrigerant vapour and the atmosphere b. To increase the absorbency potential of used absorbent c. To speed up the evaporation of the refrigerant d. To cool the concentrated absorbent e. To cool the refrigerant vapour

In the SI (metric) system the enthalpy of air is measured in a) degrees C b) % c) BTU's/kg of dry air d) kJ/kg of dry air e) kW/kg of dry air

Indicate which extinguishing agents are most suitable for hot oil fires. a) water only b) foam and dry chemical c) carbon dioxide gas d) a wet blanket e) ether and ethylene

Indicates the value of the variable (pressure, level, or flow) being monitored or recorded on a chart for future reference. a. Transmitter b. Controller c. Indicator d. Recorder e. Process variable

Infrared heaters are used in: Choose one answer. a. Theaters b. Lecture halls c. Libraries d. Skating rinks e. Offices

Infrared heaters are usually mounted: Choose one answer. a. Overhead b. At shoulder height c. In floors d. Under windows e. Over doors

Insufficient heat throughout a building is likely caused by: Choose one answer. a. Too much ventilation b. Insufficient heat input c. Poorly insulated ducting d. A missing filter e. An unbalanced system

Integral and Derivative functions Choose one answer. a. may be combined with multi-position controllers b. are also called feed-forward and cascade functions c. Help to maintain a process variable on set-point. d. Are used in on-off control. e. Slow down the controller response when the process variable deviates from the set-point.

Just before entering the waterside of the boiler it is important to a) notify the inspector in writing of your intent to do so b) ensure the chief engineer is aware of your intent c) be wearing self contained breathing apparatus (SCBA) d) test the atmosphere with an oxygen "sniffer" e) obtain permission to do so from plant management

Kiln-dried lumber refers to drying lumber a) by air seasoning b) by stacking it in layers so that each surface receives natural air currents c) by automatically maintaining temperature, humidity, and ventilation by using forced ventilation and steam coils d) slowly over a long period of time e) in a shed-like building by natural air circulation

Ladders constructed on the job must comply with the a) WCB suggestions b) ASME codes c) CSA codes d) fire department's by-laws e) WCB regulations

Large power production plants tend to be of the thermal type because they can burn solid fuels and: a) they are the least expensive to build b) the noise level is much less than internal combustion engines c) the heat cycle they use is the most efficient d) solid fuels are the most plentiful and cheapest e) require the least amount of manpower

Larger size solenoid type gas valves open wide in approximately ---- seconds to prevent a furnace puff a) 1 to 2 b) 6 to 8 c) 10 to 12 d) 4 to 5

Maintenance of a flame safeguard device should NOT include which of the following? Choose one answer. a. Using a fine file to clean the contact points b. Removing oxidation from the contacts c. Blowing dust out of the sight tube d. Removing deposits from a flame rod e. Drawing a piece of hard paper between the contacts.

Many typical steam plant auxiliaries are eliminated with a gas turbine due to its a) small size b) high speed c) high power to weight ratio d) simplicity e) low oil consumption

Mechanical seals: a)1. are used where leakage is objectionable b)2. replace stuffing boxes c)3. provide a better seal than packing d)4. are less costly than stuffing boxes e) 123

Moisture in a system can result in which of the following? a) formation of ice b) acid formation c) corrosion d) deterioration of motor insulation e) all of the above

Most dimmer switches sold today a) divert some current through a variable resistor b) can be used with incandescent or fluorescent lighting c) save most of the power not being used by the luminaire d) can control the lighting level from 0 - 100% e) are not cost effective as energy savers

Occupancy sensors are a) semi-automatic switches b) self-regulating switches c) automatic switches d) modulating switches e) packaged switches

Oil burners can be divided into three classes: 1. air and steam atomizing burners 2. mechanical or pressure atomizing burners 3. centrifugal or rotary cup burners 4. atmospherical pressure burners 5. gravitational pressure burners a) 1, 2, and 3 b) 1, 2, and 4 c) 2, 3, and 4 d) 3, 4, and 5 e) 2, 3, and 5

Oil pressure failure switches are used to perform which of the following functions? a) Keep oil from freezing at low pressure. b) Prevent compressor startup if the oil heater fails. c) Separate refrigerant dissolved in the oil from the lubricant. d) Shut down the compressor when the oil pressure drops below the minimum. e) Keep the oil pressure at a level where the oil will not freeze.

Older radiators were usually made of: Choose one answer. a. Steel b. Cast iron c. Stainless steel d. Copper e. Brass

On-off thermostats are equipped with: Choose one answer. a. An open contact switch b. Humidity compensation c. Two or more switches, operated in sequence d. A potentiometer e. A resistance slidewire

One advantage of cast iron boilers is: Choose one answer. a. Their high factor of brittleness b. Reduced vibration due to their heavy foundations c. Unlimited operating pressures d. Resistance to corrosion e. Their capacity is fixed and cannot be increased

One of the main considerations in the construction of radiators suitable for steam heating systems is: Choose one answer. a. Large heating surface area b. Ruggedness c. Attractiveness d. Modern in appearance e. Light weight

One of the main functions of the lubricant in a sealed, grease type anti friction bearing is a) wear reduction b) sealing c) shock absorption d) cooling e) surface separation

One of the main purposes of an external inspection is to a) observe operation and maintenance practices b) check the plant records, log books, etc. c) verify that scale is not present on or in the tubes d) check the operation of each safety shutdown device e) inspect all auxiliary equipment and pressure vessels

One of the main types of illumination is: Choose one answer. a. Emergency lighting b. Direct lighting c. General (uniform) lighting d. Structural lighting e. Indirect lighting

Over charging the system with refrigerant will create: Choose one answer. a. The formation of bubbles in the sight glass b. A high discharge condition c. A low-pressure suction condition d. The formation of frost at the compressor inlet e. A low oil pressure condition

Overheating of boiler heating surfaces due to low water: Choose one answer. a. Is a major cause of boiler failure b. Will cause a furnace explosion c. Can be eliminated with a low water fuel cutoff d. Cannot occur in a hot water boiler e. Can be prevented with proper water treatment

Parallel blade air dampers, when used in HVAC systems, Choose one answer. a. Are used only in small sizes with low velocity air b. Are used when air leakage must be minimized c. Have blades linked so adjacent blades rotate in opposite directions d. Are often used on mixing boxes for both outside and recirculated air e. Are unsuitable for two position damper operation

Parallel blade dampers are usually used for a) changing the direction of the air flow b) varying the amount of air flow c) turning the air flow on or off d) proportional operation e) mixed air control (outside and inside air)

Platforms should have a __________ edge going around them to prevent objects from rolling off. a) square b) wire c) metal d) raised e) magnetic

Plugged _____ on warm air heating and ventilating systems limit the air flow, and result in insufficient heating and fuel wastage. Choose one answer. a. Filters b. Heat exchangers c. Diverters d. Univents e. Convectors

Pneumatic controllers are divided into two basic classes a) direct and indirect b) off/on and proportional c) positive and negative action d) bleed and non-bleed e) reset and gain

Primary and secondary winding's are split into two equal parts, with one half of the primary and one half of the secondary wound on each of the two "legs" of the transformer. This transformer is called? a) current transformer b) core type transformer c) potential transformer d) shell type transformer e) resistance indicator

Quickly closing the main burner manual cock valve during boiler operation should trip the: Choose one answer. a. Flame scanner b. Combustion air proving switch c. Low gas pressure fuel cut-off d. High gas pressure fuel cut-off e. Low fire interlock switch

R-134a is non-toxic and non-flammable. Which of the following groups does it belong to? Choose one answer. a. Group A2 b. Group B4 c. Group A1 d. Group A3 e. Group B2

Resistance temperature devices can provide a relatively linear resistance variation from: Choose one answer. a. -60 to 80°C b. -40 to 120°C c. -40 to 250°C d. 0 to 100°C e. 40 to 100°C

Return air duct leakage calculations include a) 3% seepage if the return air duct is outside the conditioned space b) 3% seepage if the return air duct is both inside and outside the conditioned space c) 10% leakage if the return air duct is inside the conditioned space d) 3% leakage if the return air duct is inside the conditioned space e) 5% seepage if the return air duct is outside the conditioned space

Rippled-finned surface type coils a) are often used for low temperature application where ice may form b) decrease the heat transfer efficiency c) increase the heat transfer efficiency by creating more turbulence at fin surfaces d) have no effect on heat transfer efficiency e) are not used in air handling systems

Rooms that are stuffy and dry are created by: Choose one answer. a. Poor air distribution b. A low supply air temperature c. Too much ventilation air d. Poorly insulated ducts e. Lack of ventilation

Rotary compressor types are? i. Open type ii. Hermetic type iii. Stationary single-blade design iv. Rotating sliding vane design v. Helical rotor design a. iii, iv,v b. i, ii, iii c. ii, iv, v d. i, iii, iv e. ii, iii, iv

Sectional evaporators control the capacity of the evaporator by which of the following means? a) Varying the quantity of air being cooled passing over the evaporator coils. b) Intermittent operation of the compressor. c) Divided multi-part evaporators which have refrigerant control valves which can be shut off independently as the load decreases. d) Switching gears in the compressor. e) Decreasing suction in the compressor

Setpoint deviation is also called: Choose one answer. a. Derivative b. Proportional band c. Offset d. Integral e. Gain

Sewer smells coming from a floor drain in a washroom can be a problem if the floors of the washroom are not cleaned often. Which of the following courses of action is the simplest way to stop the smell from coming out of the drain? a) Pour a pail of water in the drain. b) Cover the drain opening. c) Sanitize the washroom. d) Flush the drain with caustic soda. e) Improve the washroom's ventilation

Since the discovery of electrons, it has been determined that electrons are a negative charge and flow from a) positive to negative b) north to south c) negative to positive d) a lower potential to a higher potential e) the battery to the source

Single stage reciprocating air compressors a) must have an air receiver b) could be of the rotary type c) do need an intercooler d) could have two cylinders e) have a smooth discharge delivery

abd

Some of the characteristics which make the gas turbine a better choice over other prime movers are: a 1. low maintenance b 2. minimum cooling water c 3. high thermal efficiency d 4. rapid start-up and loading

Some of the components of an automatic control loop are a sensing element, a transmitter, a _____ and a control valve. Choose one answer. a. Controller b. Transformer c. Transducer d. Piping system e. Converter

Some of the hazards of transformer cooling oil can be compensated for by adding a) chelates b) anti-foaming substances c) chlorinated hydrocarbons d) Freon e) organic compounds

Stove bolt nuts are usually a) hexagonal b) square c) fine thread d) self locking e) left hand thread

Standard air is the: Choose one answer. a. Mass of 1 cubic meter of dry air at 20°C and atmospheric pressure b. Mass of a cubic meter of air at atmospheric conditions c. Volume of air at ambient temperature and atmospheric pressure d. Volume of 1 kg of dry air at 21°C and atmospheric pressure at sea level or 101.325 kPa e. Volume of 1 kg of air at 15°C and 100 kPa

Standard mechanical air filters will remove: Choose one answer. a. All particles in the air b. Fine particles in the air c. Smoke in the air d. Odour in the air e. Coarse dust in the air

Superheat the evaporator is defined as: a. The most efficient way to remove heat from a process b. The heat required to accelerate the cooling process c. The additional heat absorbed by a refrigerant after it has vaporized d. The best heat available

Supplementary units located in each zone provide a) ventilation b) humidity control c) air circulation d) heating e) filtering

The CSA code states that a boiler not under continuous attendance must be equipped with a low-water fuel cutoff which a) must be a normally open switch b) can also activate an alarm c) may be equipped with isolation valves d) must be a manually reset device e) serves no other purpose

The Hartford Loop prevents the water in the boiler from: Choose one answer. a. Exceeding the maximum temperature b. Exceeding the highest safe level c. Dropping below a safe level d. Entering the equalizer piping e. Flowing out through the steam main

The amount of heat absorbed by water when it evaporates at atmospheric pressure is Choose one answer. a. 99.63 kJ/kg b. 335 kJ/kg c. 417.46 kJ/kg d. 2257 kJ/kg e. 2675.5 kJ/kg

The amount of liquid that may flash into vapour can be as high as? a. 30% b. 40% c. 50% d. 60% e. 70%

The amount of water used in an evaporative condenser is only a small percentage of that used in a water condenser of the same capacity. This is due primarily to what? a) Evaporating condensers also use air to cool the refrigerant. b) The evaporating condensers spray refrigerated water onto condensing coil. c) Water evaporating requires a large amount of latent heat. d) Water being recirculated. e) None of the above.

The amount of water used in the evaporative condenser of a refrigeration plant is only a small percentage of that used in a water condenser of the same capacity, because Choose one answer. a. Evaporating condensers also use air to cool the refrigerant b. The evaporating condensers spray refrigerated water onto condensing coil c. The cooling water evaporates, removing far more heat per kilogram of system coolant d. Of water conservation methods e. Of the scarcity of water in locations that use evaporative condensers

The apparatus which converts current signals to pneumatic and pneumatic to current signals is called a a) converter b) inducer c) inverter d) transducer e) transformer

The basic unit of electrical power is the watt, which is the result of v x amp a) volts plus amperes b) volts times ohms c) volts times amperes d) ohms times amperes e) ohms plus amperes

The basic unit of mechanical or electric power is the a) volt b) watt c) ampere d) ohm e) Newton

The battery of an electrical circuit a) gives a load to the circuit b) withholds neutrons from the circuit c) supplies electromotive force d) maintains lighting for the circuit e) decreases the resistance

The bent tube boiler design allows the tubes to be attached radially on the outside of the a) furnace b) superheater c) economizer d) shell or drum e) air pre-heater

The best type of diagram for showing supply and distribution systems is the a) riser diagram b) one-line diagram c) elementary diagram d) connection diagram e) terminal and connection diagram

The bi-metal sensing element consists of a strip made up of two thin layers of metal with: Choose one answer. a. Similar rates of thermal expansion b. Widely different rates of thermal expansion c. Different specific heats d. Widely different rates of thermal conductivity e. Different resistances

The black demand pointer of a power meter a) moves the red pointer b) always reads the current demand c) resets automatically d) indicates the amperage being drawn e) must be manually reset

The combustion air proving switch a) should be checked when air flow is minimum b) should not be checked while the boiler is in the purge cycle of start-up c) is a normally closed switch d) must always be a manual reset device e) should be checked when air flow is maximum

The capacity of a centrifugal pump should only be reduced by a) throttling the suction valve b) closing in the suction valve c) closing in both the suction and discharge valves d) opening the pump casing vent valve e) closing in the discharge valve

The comfort of human beings is affected by a) temperature b) relative humidity c) air cleanliness d) air movement e) all of the above

The control which is replacing suction throttling and operates by swirling the refrigerant in the same direction as the compressor impeller, resulting in a reduction of power required by the compressor is which of the following controls? a) Hot gas bypass b) Cylinder bypass c) Variable Inlet Guide Vanes d) Damper control e) Compressor un loader

The convection tubes of a typical up-draft model fired heater are located in the a) firebox b) stack c) radiant zone d) breeching e) refractory lining

The copper tube tubular boiler a) can be gas or oil fired b) has a one part heating surface c) has the furnace in the upper section d) is highly susceptible to corrosion e) is capable of very large capacities

The cross-section of a Bourdon tube is generally a) circular b) round c) cylindrical d) spherical e) oval

The design capacity of a constant capacity mechanical atomizer is a function of: Choose one answer. a. Orifice size b. Pump speed c. Pump size d. Supply pressure e. Oil viscosity

The dial of a pressure gauge on a hot water boiler indicating SI units can be graduated in a) metres of mercury b) mm of water c) mPa d) psi e) kPa

The effective throttling range of control pressure used in 100 kPa circuits is usually considered to be from: Choose one answer. a. 20 to 90 kPa b. 0 to 100 kPa c. 3 to 15 kPa d. 2 to 25 kPa e. 20 to 103 kPa

The electrical output from a thermocouple is measured by a a) milliamp meter b) watt meter c) milliwattmeter d) millivoltmeter e) power meter

The electrical pressure that causes current flow through a circuit is a) electromotive force b) very high voltage c) the ohm d) the watt e) amperage

The electrical resistance of a thermistor will a) decrease when cooled b) decrease when heated c) increase when heated d) remain constant with temperature changes e) none of the above

The fan which discharges maximum air delivery at the lowest power requirement and is used mainly to produce large air movements at low pressures is a) the propeller fan b) the tube axial fan c) the backward inclined blade fan d) the radial blade fan e) the forward curved blade fan

The feedwater supply to most heating boilers is controlled by a _____ switch. Choose one answer. a. Flow b. Float c. Differential pressure d. Drum level e. Cut-off

The field rheostat changes the ________in a DC generator. a) output voltage b) input voltage c) output current d) input resistance e) horse power

The function of a flame failure device is to a) shut off the fuel supply when the pressure gets too high b) shut off the fuel when the burner flame goes out c) shut off the fuel when the fuel temperature is high d) shut off the feed-water supply to the boiler

The function of a programming control is a) to supervise feed water supply to the boiler b) to regulate the fuel supply to the burner c) to regulate combustion controls during start-up d) control the boiler blowdown rate e) to regulate fuel, air, and water supply to the boiler

The function of a safety heads is to: a. Relieve the pressure of compression when the compressor cycles off b. Relieve the pressure in the cylinder if a liquid slug of refrigerant is in the cylinder c. Protect the compressor from over heating d. Protect the compressor from short cycling

The great majority of steam turbine governing systems utilize the a) hydraulic system principle b) pneumatic system principle c) mechanical centrifugal principle d) lever principle e) bi-metal expansion principle

The greatest fears in hot water coil installations handling subfreezing air are: i) pipe expansivity ii) outside air temperature being too low iii) failure of the circulating pipe iv) water viscosity being too high v) failure of the heat source a) i, ii, and iv b) i, ii, and iii c) iii only d) i, iv, and v e) iii and v

The group of fans which consist of a rotor or wheel having several radial blades, which is mounted on a shaft within the fan housings is a) Axial flow b) Centrifugal c) Both Axial flow and Centrifugal d) Archial flow e) None of the above

The heat content of air is called the a) temperature of the air b) humidity of the air c) enthalpy of the air d) psychrometry of the air e) entropy of the air

The heat recovery system which makes use of an underground heat exchange coil is called a: Choose one answer. a. Run around system b. Thermal wheel c. Heat tube d. Heat pump e. Heat pipe

The heat that a refrigerant absorbs to cause it to change from a liquid state to a gaseous state is called: a. Sensible heat b. Convection c. Latent heat of Evaporization d. Radiant heat

The inclined "U" tube manometer: Choose one answer. a. Will measure pressure in MPa b. Can only be used with mercury c. Is more accurate than the "U" tube manometer d. Has two furnace connections e. Is more difficult to read than the U-tube manometer

The initial fill of a hot oil system surge tank is usually done by: Choose one answer. a. Pipe line b. Use of a vacuum pump c. Field pressure d. Bucket brigade e. Bulk truck delivery

The initial refrigerant charge is given where on the system? a) The high side of the system b) The low side of the system c) The evaporator d) The expansion valve e) The heat exchanger

The injection pump of a diesel engine is driven by a) piston action b) the governor c) the wrist pin d) the gudgeon pin e) the camshaft

The inner walls and floor of a furnace in a fired heater, are usually lined with a) fiberglass bales b) asbestos blocks c) ceramic tile d) refractory brick e) pyrex glass

The intake section arrangement which draws in room air, conditions it, and then returns it into the room is called a) fixed percentage outdoor air circulation b) full re-circulation c) 100% outdoor air circulation d) mixed air circulation e) blended circulation

The inter meshing of gear teeth is a place where lubrication a) corrosion reduction is very important b) friction reduction is very important c) sealing is very important d) shock absorption is very important e) temperature control is very important

The intersection between the line running vertically from the point on the dry-bulb scale and the downward diagonally running line from the wet-bulb scale is defined as a) the Dewpoint temperature b) the partial pressure c) the reference point d) the specific volume e) the relative humidity

The inverted bucket steam trap is a) used when the coil steam pressure is higher than 172 kPa or 25 psig b) used when the flow is modulated c) used when the coil steam pressure is lower than 172 kpa or 25 psig d) recommended when condensate flows by gravity into a return main at atmospheric pressure e) more expensive than the F & T trap

The knot that forms a loop that will not slip or jam is the: Choose one answer. a. Square or reef knot b. Figure eight c. Clove hitch d. Sheet bend e. Bowline

The larger the difference between the temperature of the liquid refrigerant entering the evaporator and the actual evaporator temperature: a. The larger the refrigerating effect will be b. The smaller the refrigerating effect will be c. The larger the latent heat will be d. The smaller the latent heat will be e. The smaller the senible heat will be

The latent heat of fusion of ice is: Choose one answer. a. The sensible heat required for melting ice b. 335 kJ per kg c. 335 kJ per ton d. The latent heat required for evaporation of ice e. 4.2 kJ per gram

The level in the condensate receiver may be automatically controlled by a: Choose one answer. a. Float switch b. Pressure reducing valve c. Gate valve d. Drain valve e. Sight glass

The lever handle of the shut-off cock between a pressure or altitude gauge and a hot water boiler should be __________ to the pipe in which it is located when the cock is open. a) perpendicular b) parallel c) adjacent d) opposite e) tangent

The life safety code requires that emergency lighting be provided for means of exit in a) places of assembly of less than 300 people b) all occupied spaces indoors c) all multiple residence units d) all educational and institutional occupancies e) office buildings with occupancies of 300 or more people

The liquid line shutoff valve is a) used when purging the system b) a regulating valve c) used to relieve pressure d) required to be closed when charging the system e) on top of the receiver

The load current has no effect on the field excitation of a a) compound wound generator b) series wound generator c) shunt wound generator d) separately excited generator e) reverse wound exciter

The low installation cost of a gas turbine is a) due to cheap materials in the blades b) due to short fuel lines c) because no fuel pump is required d) because no electrical wiring is required e) because less auxiliary equipment is needed

The low water cut-off can be tested by a) raising steam pressure b) shutting off the fire c) shutting off the feed water d) opening the safety valve e) closing the steam discharge valve

The low water cut-off of a low pressure steam heating boiler should be tested Choose one answer. a. By electrician who specializes in boiler controls b. By lowering the water level, and ensuring the boiler shuts off before the water reaches the bottom of the visible part of the gage glass c. Several times per shift d. For correct operation on an annual basis e. By first shutting off the burner, to prevent boiler damage if the cut-off should fail during testing.

The maximum % error we should use when calculating the mass of a light object is a) 3 b) 5 c) 10 d) 15 e) 20

The maximum pressure of a low pressure steam heating boiler is a) 70 kPa b) 103 kPa c) 113 kPa d) 207 kPa e) 1104 kPa

The maximum temperature of water in a gravity hot water system is: Choose one answer. a. 65°C b. 70°C c. 77°C d. 87°C e. 120°C

The most common method of getting a reasonable idea of an object's __________ is by estimating it. a) size b) shape c) density d) mass e) specific gravity

The most common oil heater is the combination of the radiant and ______type. a) convection b) conduction c) superheat d) reheater e) portable

The most common system installed in most residences where the furnace is located in the basement and provides conditioned air via ducts to each room is called a) a forced air system b) a single zone, constant air volume system c) a low velocity terminal reheat system d) a mul-tizone system e) a unit ventilator

The most common type of damper operator is a a) slide b) ramp c) bellows d) piston e) pilot positioner

The most important piece of equipment of a hot oil system is a) the heater b) the pump c) the surge tank d) the UV e) the burner

The net refrigerating effect of a refrigerant is the amount of heat: Choose one answer. a. Discharged by the condenser b. Absorbed by the refrigerant in the evaporator c. Absorbed by the refrigerant in the condenser d. Discharged by the refrigerant in the evaporator e. Absorbed by the evaporator

The number of cycles per unit of time measured in Hz, is known as a) time delay b) commutation c) frequency d) alternation e) motor speed

The operating control which consists of a hygroscopic element made of material similar to multiple strands of human hair is called a a) humidistat b) thermostat c) fluid expansion regulator d) pressure-stat e) bimetal element

The raw material used in pulp and paper mills is a) water b) chemicals c) bark d) wood chips e) bleach

The packing gland of a boiler circulating pump should have some leakage: Choose one answer. a. To prevent the packing from drying out b. So that the shaft sleeve will take the wear c. In order for the stuffing box to run at the desired high temperature d. So the operator can tell when the pump becomes vapour bound e. In order to keep the motor amperage down

The packless radiator valve has a bronze diaphragm that completely seals off the valve body, to prevent: Choose one answer. a. Air from entering the radiator b. Condensate accumulation in the valve body c. Air leaking out around the valve stem d. Steam leaking out around the valve stem e. Differential pressure from changing the valve setting

The performance of a heat pump system (or C.O.P.) is the ratio of: Choose one answer. a. Heat output divided by heat input b. Heat input divided by energy output c. Energy input divided by energy output d. Energy input divided by heat output e. Heat output divided by energy input

The perimeter loop system of furnace ducting is ideal for a building with: Choose one answer. a. No insulation in the walls b. Concrete walls c. No basement d. Low headroom in the basement e. No cold air returns

The piping and heating units of a steam heating system must be so arranged that a) the condensate can flow freely to the heating units b) the air can be kept at the top of the heating units c) steam can flow freely to all heating units d) all of the above e) none of the above

The piping and heating units of a steam heating system must be so arranged that the: Choose one answer. a. Condensate can be circulated back to the heating units b. Steam can flow freely from the heating units and be returned to the boiler c. Air can be expelled from the heating units and piping d. Air can be kept on top of the heating units e. Condensate can flow freely to the heating units

The piston in a motorized gas valve is closed by a) loss of power b) released of hydraulic fluid c) spring action d) all of the above

The point angle of a properly ground drill should be a) 78 degrees b) 35 degrees c) 112 degrees d) 118 degrees e) 121 degrees

The pounding or banging of pipes and shuddering of fixtures caused by a shock wave resulting from a sudden stop of water flow in a pipe results in which of the following sounds? a) chattering of faucets b) whistling of faucets c) water hammer d) hissing in the pipes e) creaking of the pipes

The power supply for an electric resistance coil furnace is a) 60 V b) 120 V c) 240 V d) 220 V e) 480 V

The preferred material for construction of hot oil systems is: Choose one answer. a. Nickel b. Stainless steel c. Non-ferrous d. Cast iron e. Carbon steel

The presence of coke deposits in a heater tube can be confirmed by a) attempting to roll a ball through the suspected bad tube b) rattling the tube mechanically and blowing out the deposit with air c) the use of ultrasound equipment d) radio graphic inspection e) conducting a hydrostatic test

The presence of coke deposits in a hot oil heater tube can be confirmed by: Choose one answer. a. Attempting to roll a ball through the suspected bad tube b. Rattling the tube mechanically and blowing out the deposit with air c. Using ultrasound equipment d. Radiographic inspection e. Conducting a hydrostatic test

The pressure range for pressure-atomizing burners fired with light fuel oil is approximately: Choose one answer. a. 50 to 100 kPa b. 150 to 250 kPa c. 300 to 550 kPa d. 550 to 700 kPa e. 700 to 850 kPa

The pressure relief valve on a hot water boiler: Choose one answer. a. Should be installed on the boiler or close to it b. Can be installed anywhere in the system c. Must be at least 51 mm pipe size d. Does not require annual checking or testing e. Can be installed with an isolation valve

The prime importance of boiler fittings is: Choose one answer. a. Economics b. To satisfy regulations c. Safety & efficiency d. Convenience e. Ease of operations

The programmer will go through a post purge: Choose one answer. a. Only if pilot fails to ignite b. Only on flame failure c. By manually advancing the timer d. On any type shutdown except, power outage e. On routine shutdown only

The propeller axial flow fan a) is the least economical fan used to produce high capacity, low pressure air movements b) is used in ducted air distribution systems c) is used in commercial air conditioning ducting d) requires the least power at minimum air delivery e) finds application in unit heaters, air-cooled condensers, and as an exhaust fan for ventilation purposes

The purpose of a condenser in a refrigeration system is a) to remove the sensible heat from the refrigerant b) to remove the latent heat from the refrigerant c) to cool the liquid refrigerant d) to vaporize the liquid refrigerant e) to reduce the pressure in the evaporator

The purpose of a cut off valve is to: a. Prevents too low of an oil pressure to supply the buner b. Cut off the burner is to high c. Relieve the pressure of the fuel in an over-pressure situation d. None of the above

The purpose of a flow switch installed in a hot water supply line to an air-handling unit is to Choose one answer. a. Stop the fan and close the outside air dampers if the low limit temperature controller malfunctions or the heat source fails b. Open the outside air dampers wide when the water flow is established c. Open the hot water supply valve further if the hot water flow drops below a safe limit d. Close the outside air dampers and stop the fan if the flow of water is interrupted, to protect the coil from freezing e. Alert the operator of a low flow condition

The purpose of a low water fuel cut-off is to a) shut off the feed pump when the water level gets too high b) shut off the fuel supply when the burner flame goes out c) shut off the fuel supply when the water pressure is too low d) start the stand-by feed water pump when level is low e) shut off the fuel supply when the water level gets too low

The purpose of a pressure reducing valve is to: Choose one answer. a. Dampens pulsations in the steam or hot water flow b. Automatically reduce pressure and maintain it at the lower pressure c. Reduce water hammer in a heating system d. Maintain hot water at a required pressure e. To reduce the feedwater pressure to the boiler

The purpose of a spark plug is a) to ignite the fuel air mixture in a gasoline engine b) to produce power for the compression stroke c) to pre-warm the engine d) to raise the ignition point of the fuel e) to ignite the air in the cylinder

The purpose of a vacuum breaker used with steam coils is to a) ensure positive air pressure in the conditioned space b) ensure negative air pressure in the conditioned space c) prevent excessive temperatures within the steam coil d) prevent possible freezing caused by a vacuum or negative pressure in the steam coil e) ensure proper operation of the steam control valve

The purpose of a vacuum breaker used with steam heating coils is to: Choose one answer. a. Prevent freezing caused by a vacuum or negative pressure in the steam coil b. Ensure negative air pressure in the conditioned space c. Prevent excessive temperatures within the steam coil d. Ensure proper operation of the steam control valve e. Prevent flashing of the condensate within the steam coil

The purpose of an inlet separator in a natural gas plant is a) the removal of undissolved gases from the hydrocarbons b) the removal of liquids from the gas c) the removal of hydrogen sulphide from the gas d) the removal of solids from the liquids e) the removal of carbon monoxide from the liquids

The purpose of annealing tube ends is a) to post heat the tube ends b) to harden the tube ends c) to prevent the ends from burning d) to obtain a neat appearance e) to soften the tube ends

The purpose of the flow switch or sail switch used with hot water coils is to a) stop the fan and close the outside air dampers if the low limit temperature controller malfunctions or the heat source fails b) open the outside air dampers wide when the outside air temperature rises c) increase the heat source temperature if the outside air temperature decreases d) close the outside air dampers and stop the fan if the flow of water is interrupted due to pump failure or closing of the hand valves e) increase the hot water flow through the coil if the outside air temperature is too low

The quartz lamp heating element will respond: Choose one answer. a. Instantaneously b. In a few seconds c. In about one minute d. In about thirty seconds e. In about three minutes

The radiator trap is a device that allows: Choose one answer. a. Debris to collect b. Steam to collect c. Water and steam to collect d. Steam to be discharged from the radiator, but prevents water from discharging e. Water to be discharged from the radiator, but prevents steam from discharging

The recommended inspection procedures for a power boiler are outlined in the: Choose one answer. a. CSA B51 Boiler, Pressure Vessel and Pressure Piping Code b. ANSI B31.1 Power Piping Code c. ASME Boiler and Pressure Vessel Code, Section I d. ASME Boiler and Pressure Vessel Code, Section IV e. ASME Boiler and Pressure Vessel Code, Section VII

The recovery system which employs a single exchange unit consisting of a casing split into two sections and a segmented rotating wheel 300 mm (12 in) thick and 1 to 3.7 m (3 to 12 ft) in diameter is called a a) runaround system b) thermal wheel c) heat pipe d) heat valve e) heat pump

The recovery system which has a capillary wick structure consisting of fine circumferential striations machined on its external surface is called a a) heat valve b) runaround system c) heat pump d) thermal wheel e) heat pipe

The reducing of oil into very small Particles is termed. a) atomization b) fractionation c) turbulence d) fluidization

The refrigerant R-11 belongs to the following group a) group "A2" b) group "B1" c) group "A3 d) group "2B" e) group "A1"

The refrigerant R-142b belongs to the following group a) group "A2" b) group "B1" c) group "A3 d) group "2B" e) group "A1"

The residential humidifier which is commonly used in the supply plenum of smaller warm air furnaces and consists of a shallow tray partially filled with water is called a a) bypass humidifier b) welted element humidifier c) steam grid humidifier d) pan type humidifier e) power type humidifier

The resistance of a liquid to internal deformation or shear is known as: a) pour point b) viscosity index c) flash point d) viscosity e) friction resistance

The right hand rule is used to a) indicate the speed of a rotor b) determine the direction of induced current flow c) determine the frequency of an alternator d) determine the direction of motor rotation e) determine magnetic flux rotation

The shrouding installed on the blading of a steam turbine serves to: a) cool the blade tips b) expand the steam c) stop the steam flow d) heat the steam e) confine the steam to the blades

The simple control which restricts the flow of liquid from the condenser to the evaporator and maintains a pressure difference between the two units by using a considerable pressure drop resulting from resistance between the devices length and small bore is called a) a high pressure float valve b) a low pressure float valve c) a bypass line d) a capillary tube e) an external float chamber

The simple, small-bore device that restricts the flow of liquid from the condenser to the evaporator and maintains a pressure difference between the two, is called: Choose one answer. a. A high-pressure float valve b. A low-pressure float valve c. An equalizer line d. A capillary tube e. An intermediate valve (pressure reducing valve)

The size of the conductor is __ to the size of the current. a. Inversely proportional b. Proportional c. Equal d. None of the above

The space around a magnet, through which the imaginary magnetic lines of force are considered to travel, is known as the a) flux field b) clearance space c) magnetic field d) planetary field e) charged field

The space or zone around a magnet through which lines of force travel is termed a) magnetic flux b) permeability c) reluctance d) magnetic strength e) magnetic field

The specific volume of air is expressed as the volume of: Choose one answer. a. 1 kg of air at 101.325 kPa in cm3 b. 0.833 kg of air at standard pressure and temperature in m3 c. 1 kg of air at 101.325 kPa and 21 degrees Celsius in m3 d. 1 g of air occupied at any temperature and pressure e. 1 kg of air, regardless of temperature and pressure

The suction strainer of a hot oil pump should be inspected and cleaned after the initial ____________ hours of oil circulation. Choose one answer. a. 5 - 6 b. 1 - 2 c. 6 - 8 d. 3 - 4 e. 4 - 5

The sulphate process of pulp production produces over _____ percent of all wood pulp produced: Choose one answer. a. 80% b. 30% c. 60% d. 40% e. 75%

The system which allows the highest water temperature is the: Choose one answer. a. Ice melt system b. Radiant panel system c. Closed expansion tank system d. Open expansion tank system e. Reverse return system

The thread pitch of a metric micrometer is a) 0.5 mm b) 2.5 mm c) 5 mm d) 0.25 mm e) 0.05 mm

The tube axial flow fan a) has higher friction losses in ducts than the straight air flow of a centrifugal fan b) has lower friction losses in ducts than the centrifugal fan c) is quiet in operation d) produces lower pressure than the propeller fan e) is not suitable for duct mounting

The two chief methods of chemical pulping are the ___________ processes. Choose one answer. a. white liquor and black liquor b. Sulphate and sulphite c. strong liquor and weak liquor d. Sodium carbonate and sodium hydroxide e. Kraft and thermo-mechanical pulping

The types of humidifiers used for residential purposes are a) air washers, wetted element, and atomizing b) pan, atomizing, and air washers c) pan, hot water, and air washers d) atomizing, wetted element, and pan e) pan, steam, and atomizing

The types of humidifiers used for residential purposes are: Choose one answer. a. Air washers, wetted element, and atomizing b. Pan, atomizing, and air washers c. Pan, hot water, and air washers d. Atomizing, wetted element, and pan e. Pan, steam, and atomizing

The unit for opposition to current flow is the a) volt b) ampere c) ohm d) watt e) newton

The unitary air conditioning system which uses a direct expansion refrigeration system to provide cooling and dehumidification in a local area without duct work is called a) a unit ventilator b) a rooftop unit c) a window air conditioner d) a high velocity terminal reheat system e) a multi zone system

The use of bent tube boiler designs allows the furnace wall to be lined with tubes, thereby exposing more of the heating surface to a) convection heat b) conducted heat c) radiant heat d) residual heat e) latent heat

The ventilation rate of a building is determined based upon the greater of the Choose one answer. a. Solar heat rate and CFM rate per person b. Conduction rate per person and solar heat rate c. CFM rate and conduction rate per person d. Infiltration rate and CFM rate per person e. None of the above

The vertical distance from the liquid surface up to the pump center-line plus the vertical distance from the pump center-line up to the surface of the liquid in the discharge tank is a) static discharge head b) static suction head c) suction lift d) total discharge head e) total static head

The voltage drop across a 20 ohm resistor with 10 amps flowing would be a) 2 b) 0.5 c) 200 d) 20 e) 150

The voltage induced in the secondary windings of the transformer, is _____ the turns ratio of the transformer. Choose one answer. a. Directly proportional to b. Reversed to c. Unrelated to d. Opposed by e. Inversely proportional t

The voltage produced in each phase of a three phase generator is displaced by __________ electrical degrees from the other phases. a) 120 b) 90 c) 60 d) 30 e) 0

The voltage required to be supplied to a 12 kW motor drawing 24 amperes is a) 5 kilovolts b) 50 kilovolts c) 288 volts d) 2 kilovolts e) 500 volts

Thermal conductivity (λ) may be defined as the: Choose one answer. a. Quantity of heat flow per unit time (in Watts) b. Ability of a material of uniform thickness to transmit heat (W/m°C) c. Heat transfer through a one-metre cross-sectional area of a particular material with defined surfaces (W/m2°C) d. Heat flow per unit time through one square metre of a material when exposed to a differential temperature of 1 degree Celsius (W/m2°C) e. Reciprocal of thermal conductance (m°C/W)

Three types of DC motors are shunt, series and a) reverse wound b) armature c) stator d) compound e) cross compound

To assure proper air venting, the a) return water connection should be at the bottom of the coil b) supply water connection should be at the bottom of the coil c) supply water connection should be at the top of the coil d) vent should be located at the lowest points of the supply and return lines, and of the coils e) double serpentine water coil circuit should be used

To avoid start-up difficulties in cold weather a thermal fluid must have a) a low pour point b) antifreeze added to it c) methanol injected into it periodically d) a dehydration system installed in the surge tank e) a low fire point

To calculate the heat gain from fluorescent lighting, add the wattage ratings and multiply by a) 0.8 b) 0.9 c) 1.1 d) 1.2 e) 2.1

To obtain full rated capacity of hot water heating coils, Choose one answer. a. Connect the water supply for counter flow b. Connect the water supply for parallel flow c. Choose a coil with fewer fins per unit length of coil d. Connect the coils with a staggered tube design e. Increase the face velocity

To obtain full rated capacity of water coils what should be done? a) Connect the water supply for counter flow b) Connect the water supply for parallel flow c) Decrease the number of fins per unit length of coil d) Connect the coils with a staggered tube design e) Increase face velocity

To test a low water fuel cut-off a) call for an electrician who specializes in boiler controls b) lower the water level until the burner shuts down c) connect an ammeter to the mercury switch d) test the water column with a test gage e) shut off the fuel to the boiler

To transfer the power to or from the rotor of alternators or some AC motors a) field poles are employed b) rheostats are used c) a commutator is used d) slip rings are employed e) anti-friction bearings are employed

Turbine lubricating oil a) is not required for small impulse turbines b) must be changed every four months c) lubricates the blades d) can be used to operate the turbine governor e) should be preheated before use

Turbine over speed trip a) prevents the turbine from vibrating b) will close the steam stop valve to the turbine c) is operated by a spring loaded pin in the rotating blades d) supplies the operator with rpm indications e) reduces the turbine speed by increasing the back pressure

Turbine pumps are best suited for a) low capacity low pressure service b) low capacity high pressure service c) high capacity high pressure service d) high capacity low pressure service e) heavy viscous fluids

Turbine pumps: a 1. are high capacity pumps b 2. are high pressure pumps c 3. has the liquid gain energy in a number of impulses d 1&2

Turbine speed can be "fine tuned" with a device which will be limited to about 10% over the rated speed. This device is the a) governor valve b) over speed governor c) sentinel valve d) hand speed control e) over speed trip

Under normal circumstances, the heat produced by the electrical wires of a circuit is very small due to the a) large diameter of the conductor b) low resistance of the conductor c) long length of the conductor d) insulation wrapped around e) small diameter of the conductor

Unit heaters differ from convectors in that they use _____ to increase heat transfer. Choose one answer. a. Metal fins b. Natural circulation c. Blowers d. Copper tubes e. Brass tubes

Unit ventilators : Choose one answer. a. do not filter the air b. do not provide fresh air c. do not use fans to circulate air d. mix outside and inside air. e. do not contain heating coils

Unit ventilators are: Choose one answer. a. Ceiling suspended unit heaters b. Baseboard type heaters c. Cabinet type heaters d. Ceiling mounted unit heaters e. Floor radiators

Using a compressed air starting motor is a popular method of starting a a) large stationary diesel engine b) small two stroke engine c) jet engine d) high performance engine e) natural gas engine

Using the psychrometric chart, find the dew point temperature at a dry bulb temperature of 20°C and a wet bulb temperature of 15°C. Choose one answer. a. 20°C b. 14°C c. 11.5°C d. 10°C e. 16°C

Using the psychrometric chart, find the specific volume if the dry bulb temperature is 20°C and the wet bulb temperature is 15°C. Choose one answer. a. 0.859 m3/kg b. 0.842 m3/kg c. 0.90 m3/kg d. 0.80 m3/kg e. 0.87 m3/kg

Usually, at least _________ pump(s) is/are installed on a hot oil system. Choose one answer. a. Four b. Twelve c. Three d. One e. Two

Utility companies have a surcharge to their customers based a) the maximum voltage used b) the maximum amperage used c) system capacitance d) transformer efficiency e) peak demand

Vapour bubbles in a pump can cause the pump to a) deteriorate b) rotate c) stall d) decoy e) cavitate

Water usage to produce paper by the chemical pulping process may be in the ratio of _____ litres of water for every tonne of pulp produced. Choose one answer. a. 13 000 b. 32000 c. 7500 d. 2 300 000 e. 230 000

Wear rings are usually constructed of a) ceramics or aluminum b) graphite or bronze c) bronze or cast iron d) steel or alloy steel e) wrought iron or pig iron

Wearing rings: a) 1. are used on impellers b) 2. are used on the casing c) 3. give protection to the shaft d) 4. reduce the maintenance cost of the pump e) 124

Wet-bulb temperature is a) the temperature indicated by a thermometer having its bulb covered by a water-wetted wick or cloth and the wet bulb is exposed to a rapidly moving stream of air b) the same as the dry-bulb temperature if the relative humidity is less than 100% c) the dewpoint temperature d) always less than the dry bulb temperature e) not required to find the relative humidity

Wetted element humidifiers a) are the same as pan type humidifiers b) can be either the power type or the bypass type c) have stationary plates placed in a tray and placed in individual rooms d) have a lower humidification rate than the pan type humidifiers e) are the same as the atomizing humidifiers

What are the three different kinds of pressure developed by a fan? a) static pressure, head pressure, suction pressure b) velocity pressure, head pressure, suction pressure c) static pressure, velocity pressure, total pressure d) head pressure, suction pressure, total pressure e) static pressure, head pressure, total pressure

What can cause a high discharge pressure with refrigeration systems? a) low evaporator level b) too much cooling water to the condenser c) over-purging the unit d) when unit runs continuously e) unit over-charged with refrigerant

What factor of safety should be used, to determine safe load for a new fiber rope? a) 10 b) 5 c) 7 d) 4 e) 3

What is the correct sequence, from start to finish, needed to replace a washer in a faucet? i) Unscrew the packing nut and remove the spindle. ii) If the valve seat is smooth and serviceable, replace the spindle and tighten the packing nut. iii) Remove the washer from the end of the spindle. iv) Shut off the water at the nearest isolation valve. v) Place the new washer on the end of the spindle. a) i, ii, iii, iv, v b) iv, i, iii, v, ii c) v, iv, iii, ii, i d) iv, i, v, ii e) v, ii, i, iv, iii

What is the function of the concentrator (generator)? a) To cool the refrigerant vapour b) To increase the absorbency potential of used Lithium Bromide c) To speed up the evaporation of the refrigerant d) To cool the concentrated absorbent e) To exchange heat between the high temperature refrigerant vapour and the atmosphere

What is the name of the refrigerant that has the following characteristics? It is nonflammable, odorless, nontoxic, it does not have a corrosive effect on metal if water is present and at atmospheric pressure it has a boiling point of -40.6 degrees C. a) Ammonia b) Freon-22 c) Sulfur Dioxide d) Butane e) Propane

What is the name of the system that consists of two finned tube heat ex-changers? a) runaround system b) heat valve c) heat pump d) heat tube e) thermal wheel

What is the primary use of the ground wood pulp, produced by the mechanical process? Choose one answer. a. Cardboard b. Soft paper products c. Blending with wood chips d. Stationary products e. Newsprint

What is wet-bulb depression? a) lowering of the thermometer bulb into water b) sum of the wet-bulb temperature and the dry-bulb temperature c) decrease in relative humidity d) difference between the dry-bulb temperature and the wet-bulb temperature e) decrease in the absolute humidity

What piece of equipment in a hot oil system requires the most operator attention? a) the hot oil user b) the flame detector c) the heater d) the burner control panel e) the safety valve

What power is dissipated by a resistor with a supply voltage of 120 volts and current of 8 amperes? P= V x A a) 960 ohms b) 15 ohms c) 15 watts d) 960 watts e) 96 kilowatts

What pressure is a boiler subjected to during a hydrostatic test? Choose one answer. a. Operating pressure b. 1/2 of normal operating pressure c. 1 1/2 times maximum allowable working pressure d. 1/2 times design pressure e. 2 times the setting of the lowest set safety valve

When a number of electrons pass a given point over a specific time period the energy may be referred to as a) an ampere b) voltage c) an ohm d) power or watts e) electromotive force

What size of packing should you use, to repack a pump gland having the following dimensions: stuffing box bore ------------- 8.6 cm pump shaft diameter ------------- 6.7 cm a) .5 cm b) 1.9 cm c) .675 cm d) 1.6 cm e) .95 cm

What type of boiler would you expect to find in a hot water system incorporating a converter? Choose one answer. a. Hot water boiler b. Steam boiler c. Forced circulation boiler d. Single-pass firetube e. Once through boiler

When a process variable has no method of sending information to the final control element the system is known as a) an automatic system b) an open loop system c) a cascading system d) feedback system e) feedforward system

What will the effect be if insufficient liquid refrigerant is admitted to the evaporator by a thermostatic expansion valve? Choose one answer. a. Insufficient force will be generated against the diaphragm and spring to open the expansion valve b. The heat in the vapour leaving the evaporator causes the pressure in the thermal element to increase opening the expansion valve c. The room temperature will decrease closing the expansion valve d. The thermal element reaches an equilibrium leaving the expansion valve in the same position e. The expansion valve will fail to respond

Whatever the size of a micrometer, the working parts can only move a distance of a) 30 mm b) 200 mm c) 250 mm d) 300 mm e) 25 mm

When AC action causes a counter current in a coil it is termed a) self inductance b) capacitance c) hysteresis d) current generation e) electromagnetic induction

When AC action causes a counter current in a coil, it is termed a) self inductance b) capacitance c) hysteresis d) current generation e) electronic induction

When a pump discharges into a vessel operating at 300 kPa, the 300 kPa is referred to as a) dynamic head b) equivalent head c) discharge head d) friction head e) total head

When Teflon is used as part of the mechanical seal, the maximum temperature of oil that can be pumped by a hot oil pump is: Choose one answer. a. 100°C b. 250°C c. 350°C d. 150°C e. 200°C

When a boiler equipped with a combination feedwater control and low water cutoff device shuts down due to a low water condition: Choose one answer. a. The feed water flow will also stop b. The level must be restored to above the cutoff line before the unit can be restarted c. It can be restarted by pressing the manual reset d. The operator must open the feeder valves to allow water into the boiler e. The condensate pump must be restarted

When a pump is operating, your inspection should include the following: a) you must check the impeller b) you must be sure the suction valve is closed c) you should check the discharge pressure d) you must be sure the drain valve is open e) you should check the oil pressure

When a reciprocating pump discharges while its piston or plunger moves in only one direction, it is termed a a) positive displacement unit b) single acting unit c) dynamic unit d) double acting unit e) duplex unit

When a recorder receives a signal from a transmitter, the recorder incorporates a a) signal reverser b) pneumatic relay c) flapper-nozzle assembly d) capsule or bellows e) transducer

When air is forced through a heating unit that contains both the fan and coil, the unit is called: Choose one answer. a. A unit heater b. An injector c. An induction unit d. A unit ventilator e. A convector

When an operator uses CRT displays, the computer control panel a) often has a number of dedicated recorders b) will be equipped with graph limiters c) will not have printout capabilities d) has only single trend display e) will not be connected to the transmitter signal

When an operator uses CRT or LCD displays, the computer control display a) can stretch or compress time periods b) will be equipped with graph limiters c) will not have printout capabilities d) has only single trend display e) will not be connected to the transmitter signal

When charging a refrigeration system it a) should be done to the condenser b) should be done with the cooling water shut off c) should be done to the receiver d) should be done with the compressor off e) should be done with the liquid line shutoff valve closed

When comparing antifreeze to water, which of the following statements is false: Choose one answer. a. Antifreeze is potentially toxic, whereas water is not. b. Antifreeze is denser than water c. Antifreeze has a higher coefficient of thermal expansion than water d. Antifreeze has a higher specific heat than water e. Antifreeze costs more than water

When comparing the tube axial fan with the vane axial fan the main difference between the two is the a) noise output b) location of the fans in the system c) location of the fan bearings d) size of the two units e) motion of the discharge air

When complete control systems become very complex, which control signal medium is preferred? a) Pneumatic b) Electric c) Electronic d) Digital e) Fiber optic

Which type of humidifier breaks water up into a mist or fog? a) A bypass humidifier b) A welted element humidifier c) An atomizing humidifier d) An air washing humidifier e) A steam grid humidifier

When control for multiple locations is required a) a 4-way switch is used b) an off-on switch is used c) two 2-way switches are used d) three or more one-way switches are used e) two 3-way switches and two 4-way switches are used

When controller output is proportional to the amount of deviation, the controller is a) derivative only b) integral c) two-position d) proportion plus reset plus rate e) proportional

When cooling down a steam boiler that has been taken out of service, a vent valve on the steam drum should be opened to a) prevent a vacuum from forming in the boiler b) release the air from the boiler c) purge the shell of impure gases d) let the operator know when the pressure has reached zero e) prevent pressure build-up in the boiler

When current flows in a conductor a) A.C. voltage is generated b) the voltage is reduced in the conductor c) no heat can be generated d) all magnetic forces are dissipated e) a circular magnetic field is set up around the conductor

When using Fleming's Left Hand Rule, the index finger represents a) generator action flux direction b) motor action motion direction c) generator conductor motion direction d) motor action flux direction e) motor action direction of current flow

When initially charging a refrigeration system a) it must be done with the liquid line shutoff valve open b) it is done with a liquid refrigerant c) it must be done after the unit is shut down d) it must be done at the compressor suction e) water should be added to dilute the refrigerant

When installed in a hot oil system, small diameter pipe (25.4 mm or smaller), if it is threaded, should be schedule: Choose one answer. a. 80 b. 100 c. 40 d. 120 e. 160

When installing a siphon it a) must be perpendicular to the piping b) must be dry c) should be downstream of an inspectors' test connection d) should be first filled with water e) shall be as close

When using a step ladder it is best to a) not work higher than the top three rungs b) have a 4:1 slope on the rung side c) have two co-workers hold the ladder steady d) secure the ladder with a rope e) place both feet on the top platform if extra height is required

When is the capacity of a heat pipe at a maximum? a) When the system is level b) When the evaporator is raised above the horizontal c) When the system is placed vertically with the evaporator on top d) When the system is placed vertically with the condenser on top e) When the evaporator is lowered below the horizontal

When joining two ropes of different diameters we use a a) reef knot b) sheet bend c) figure eight knot d) sheep shank e) round turn and three half hitches

When like poles of a magnet are placed adjacent to each other they will a) be attracted to each other b) bend c) increase in temperature d) repel each other e) have no reaction

When looking at building function to select a system which of the following factors are considered? i) Physical size of the building ii) Climatic conditions iii) Amount of zoning required iv) Funds available for the system v) Occupancy periods vi) Need to operate certain areas off-hours a) i, ii, and vi b) iii, v, and vi c) i, iii, iv, v, and vi d) ii, v, and iv e) i, iii, iv, and vi

When lubricating equipment, the operator should also check for: a)1. unusual machine noises b)2. unusual consumption of lubricant c)3. excessive heat in bearing housing d)4. excessive leakage of lubricant e) all of the above

When magnetic flux lines travel and meet in opposing directions the result can be a) generator action b) electromagnetism c) solenoid action d) motor action e) reluctance

When magnetic flux produced by one coil induces an EMF in a second coil it is called a) self inductance b) electromagnetic induction c) mutual inductance d) capacitive reactance e) inductive reactance

When personal computers are linked together and information flows between them, it is called: Choose one answer. a. Telecommunicating b. Networking c. Teleconferencing d. Linking e. Hardware sharing

When petroleum oils break down or crack due to high temperature, the products formed are insoluble and: Choose one answer. a. More viscous b. Less viscous c. Highly flammable d. Corrosive e. Possess good heat transfer characteristics

When plugging off a tube in a boiler, the plug taper should be a) 2 to 1 b) 5 to 1 c) 7.5 to 1 d) 10 to 1 e) 20 to 1

When preparing a boiler for startup and the boiler is equipped with a modulating combustion control, it is best to a) set the manual-auto switch to "auto" b) set the manual-auto switch to "auto" and set the flame control switch in the lowest position c) set the manual-auto switch to "auto" and set the flame control switch in the highest position d) set the manual-auto switch to "manual" and set the flame control switch in the lowest position e) set the manual-auto switch to "manual" and set the flame control switch in the highest position

When pumping down a refrigeration system it is recommended to leave _______ residual pressure in the system to prevent air being drawn in through minor leaks or compressor shaft seals. Choose one answer. a. 7 to 15 kPa abs b. 5 to 15 kPa abs c. 4 to 14 kPa abs d. 7 to 14 kPa abs e. 10 to 20 kPa abs

When reading the dials of a power meter, read a) them in the sequence shown by the letters under each b) them from left to right c) the ones which rotate clockwise first d) them from right to left e) them only at the request of the utility company

When relative movement ceases, production of induced E ceases. This process is called a. Harmonic distortion b. Self inductance c. Mutual inductance d. Electro-magnetic induction

When shutting down a boiler for internal cleaning, you should: Choose one answer. a. Shut down the boiler, then fill it completely with chemically treated water b. Shut off the fire, drain, open up and flush c. Allow the boiler to cool; then drain, open up and flush it d. Shut off the fire and flush with cold water to cool it down e. Let it stand for a couple of days then drain

When shutting down the refrigeration system for a weekend or less which of the following is a correct shutdown procedure? a) Drain the cooling water circuit b) Close the manual steam or hot water supply valve c) Service the purge pump d) Open all disconnect switches e) Turn off the air supply to the pneumatic control system

When some refrigeration systems are to be shut down for a prolonged period of time they should be "pumped down" and the refrigerant stored in the: Choose one answer. a. Evaporator b. Condenser c. Receiver d. Compressor e. Supply cylinders

When starting a steam turbine it is customary practice to a) analyze the oil for water prior to rolling b) turn on all cooling water systems first c) place the speed control system in service once the unit is rolling d) test the over-speed trip as soon as running speed is attained e) stop the auxiliary oil pump as soon as steam begins to turn the unit

When the boiler is removed from service, it can be drained once the temperature reaches approximately a) 150 degrees C b) 30 degrees C c) 50 degrees C d) 90 degrees C e) 70 degrees C

When the fireside of a boiler is first opened up, small leak seepage spots can be detected by a) ultraviolet light b) white salt deposits resulting from water evaporation c) water on the furnace floor d) hissing sounds e) water running down the tubes

When using a step ladder, it is best to: Choose one answer. a. Not work higher than the top three rungs b. Work carefully while standing on the top platform c. Have two co-workers hold the ladder steady d. Use a metal ladder e. Secure the ladder with a rope

When using an electrical meter to check that a circuit is safe to work on, it is important to verify the proper scale, current, or both that is being used because a) it may appear that no voltage or current is present and therefore safe b) the meter will be damaged c) the user will be subjecting himself or herself to danger d) the main high voltage transformer circuit will be opened e) electrical wiring will be damaged by fire or overheating

When working inside a steel heating boiler, which of the following safety precautions should you take? 1. boiler must be cooled and vented 2. valves must be closed and locked, and all lines to and from the boiler must be blanked 3. you may use ungrounded wiring 4. always have one man standing outside, whenever anyone is inside the boiler a) 1, 2, 3 b) 2, 3 c) 2, 3, 4 d) 1, 2, 3, 4 e) 1, 2, 4

Where pistons move in a cylinder it is necessary for the lubricant to provide a) tension b) sealing c) alignment d) shock reduction e) vapor venting

Which type of oil produces higher fluid friction? a) a high viscosity oil b) a low viscosity oil c) a low viscosity oil with a high flash point d) synthetic oils e) all mineral oils

Which column in the refrigerant table lists the absolute pressure in kPa? a) Column 1 b) Column 2 c) Column 3 d) Column 4 e) None of the above

Which control is used to maintain a constant level of liquid refrigerant in a flooded evaporator in the liquid reserve tank? a) thermostatic expansion valve b) automatic expansion valve c) low pressure float valve d) hand operated expansion valve e) high pressure float valve

Which of the following air handling systems is not appropriate for a single zone application? Choose one answer. a. A packaged air conditioner b. A dual duct system c. A unit ventilator d. A rooftop unit e. A single zone constant air volume system

Which is not a method employed to maintain the desired temperature of the spray water in air washers used in air conditioning systems? a) an electric heater and fan b) part of the spray water is recirculated and hot or cold water is added as required c) the spray water if recirculated through a heat exchanger and is cooled by chilled water d) the spray water is recirculated through a heat exchanger and is heated by hot water e) a heating or cooling coil is directly mounted in the sump of the washer

Which law describes the existence of moisture in the air in vapour or evaporated state? a) Newton's laws of gravity b) 1st law of Thermodynamics c) Dalton's Law of Partial Pressures d) 2nd law of Thermodynamics e) Boyle's Ideal Gas Law

Which of the following Is not an airborne contaminant? Choose one answer. a. Dust b. Smoke c. Fumes d. Pollen e. Moisture

Which of the following actuating control valves is electromagnetically operated? a) Thermostat valve b) Fluid expansion regulator valve c) Evaporator pressure regulating valve d) Condenser cooling water regulating valve e) Solenoid valve

Which of the following air handling systems is not suitable for providing cooling simultaneously to several distinct locations in a building? Choose one answer. a. A roof top unit b. A dual duct system c. A low velocity terminal reheat system d. A high velocity terminal reheat system e. A multi-zone system

Which of the following are direct expansion evaporators and flooded evaporators? 1. bare tube 2. the plate surface 3. the shell and tube 4. the finned tube a. 1,3 b. 2,3 c. 1,2,4 d. 1,2,3,4

Which of the following are direct expansion evaporators? 1. bare tube 2. the plate surface 3. the shell and tube 4. the finned tube a. 1,3 b. 2,3 c. 1,2,4 d. 1,2,3,4

Which of the following are elements of a mechanical purging system? i) purge pickup tube ii) purge chamber iii) manual shutoff valve iv) safety solenoid valve v) oil trap vi) vacuum pump a) i and ii only b) i, ii, and v only c) iv and vi only d) i, iii, and v only e) all of the elements

Which of the following are principal parts in a closed cycle compression refrigeration system? i) Absorber ii) Evaporator iii) Compressor iv) Condenser a) both i and ii b) iii only c) i, ii, iv d) ii, iii, iv e) i, ii, iii

Which of the following characteristics is common in all of the group B refrigerants? a) High toxicity b) High flammability c) Average Flammability d) Low Toxicity e) Low flammability

Which of the following components of an air handling system is not likely to be found in a typical constant air volume system when combined with perimeter heat? Choose one answer. a. Cooling coils b. Heating coils c. An air mixing section d. Filters e. A humidifier

Which of the following compressor types uses impellers to draw in vapour? a) Centrifugal compressors b) Rotary compressors c) Reciprocating Compressors d) None of the above e) All of the above

Which of the following devices has a de-clutching feature? a) A fluid drive b) An outlet damper control c) A variable inlet vane control d) A variable speed motor control e) A V-belt drive

Which of the following has a trap as an integral part of the fixture? a) water closet b) sink c) storm drain d) sewer e) sump pump

Which of the following has the greatest effect on the viscosity of a lubrication oil? a) pressure b) load c) flow d) temperature e) speed

Which of the following has the highest boiling point at atmospheric pressure? Choose one answer. a. Ammonia b. Freon 12 c. Freon 22 d. Freon 113 e. Water

Which of the following is NOT an advantage of a run-around heat recovery system? Choose one answer. a. The system can be retrofitted to existing HVAC systems with relative ease b. Maintenance is relatively simple c. 100% heat recovery is possible during the coldest times of the year d. No cross-contamination of airflows occurs e. The exhaust and ventilation ductwork can be located at a distance from one another

Which of the following is NOT considered a rotary refrigeration compressor design? Choose one answer. a. Screw b. Sliding vane c. Helical rotor d. Centrifugal e. Stationary single-blade

Which of the following is not a component of the low pressure side of a compression refrigeration system? Choose one answer. a. Compressor discharge piping b. The evaporator c. The downstream side of the expansion valve d. Compressor inlet e. The suction line

Which of the following pipe joints should be used for high pressure 1 1/4 inch or smaller piping? a) welded b) screwed c) soldered d) flared e) none of the above

Which of the following properties cannot be found on the psychrometric chart? a) dewpoint temperature b) partial pressure c) specific humidity d) enthalpy e) relative humidity

Which of the following statements about Air washers is false? a) Air washers can cool air. b) Air washers can remove tobacco smoke. c) Air washers can dehumidify air. d) Air washers can heat air. e) Air washers can clean air.

Which of the following statements about Lithium bromide systems is false? a) Lithium bromide solution has the ability to absorb water vapour readily. b) The operating cycle in the system is continuous. c) Evacuating the system lowers the boiling point of water. d) As water vapour is absorbed by the Lithium Bromide the vacuum decreases. e) System efficiency is increased by forcing water through a spray header.

Which of the following statements about Manual Purging Systems is false? a) They must be operated on a regular schedule. b) The receiver and condenser should be purged separately. c) Purging rids the system of non condensable gases. d) Refrigerant vapour in the purger is always expelled with the non-condensable gases. e) Gas being vented into the atmosphere must pass through a water beaker.

Which of the following statements about air handling units is true? a) In any system the air is mainly conditioned in the units b) The units can only heat air c) The units only circulate d) For each function there needs to be a separate air handling unit e) None of the above

Which of the following statements about the unit ventilators is false? a) The units are used in areas with limited available floor space b) The units provide individual room temperature control c) The units provide cooling only d) The units provide heating e) Room air is mixed with outside air

Which of the following would you NOT find in a steam heating system? Choose one answer. a. Cushion tanks b. Convectors c. Return traps d. Condensate tanks e. Air vents

Which one is NOT true about rotating mechanical seals a. Low cost b. Less maintenance c. Reduced wear on rotating shafts d. Leakage is reduced to a minimum

Which type of coil circuiting is designed to produce a high heat capacity with a limited water quantity? a) Single serpentine b) Double serpentine c) Half serpentine d) Face velocity e) Steam coil

Which statement about compartmental variable air volume HVAC systems is false? Choose one answer. a. Smaller air handling units are located on each floor replacing a larger central unit b. Each air handling unit is installed in a mechanical room for noise reduction, safety and appearance c. Each air handling unit has its own filter, cooling coil and supply air fan d. Each compartmental unit supplies from 15 to 100% outside air for ventilation and cooling e. A central air handling unit provides humidified air at 12.5°C for ventilation to each floor

Which transformer is used to trap the harmonics on the primary winding's? a) k-type transformer b) core type transformer c) potential transformer d) shell type transformer e) Autotransformer

While addressing the building function factors of an HVAC system, a designer considers Choose one answer. a. operating costs b. operation staff's prior experience and familiarity with the HVAC system c. normal occupancy periods d. maintenance requirements e. capital costs

While refractory is drying in a heater, circulated oil in the tubes is a) allowed to rise in temperature at not more than 55 degrees Celsius per hour b) allowed to drop in temperature at not more than 55 degrees Celsius per hour c) maintained in temperature d) drained from the system e) super heated

While warming up an additional hot water heating boiler in preparation to put into service with other boilers, which of the following is true? Choose one answer. a. Stop valves in the supply and return lines are both closed b. Supply valve is open slightly and the return line is closed c. Supply and return lines are open d. Supply and return line valves are both open slightly e. Boiler must be isolated from the expansion tank

Why is the positioner for the outdoor air damper of an HVAC air handling unit interlocked with the supply fan? Choose one answer. a. So the damper will close when the fan starts b. So the damper will open when the fan starts c. So the fan starts when the damper opens d. To ensure the fan stops when the damper is fully open e. To ensure the fan starts when the damper is fully closed

Wire rope classified as 8 x 12 means it has a) a factor of safety of 8 and is 12 metres long b) a factor of safety of 12 and is 8 metres long c) 8 strands with 12 wires per strand d) 12 strands with 8 wires per strand e) none of the above

A common air pressure range for pneumatic control systems is a) 3 to 15 kPa b) 20 to 100 psi c) 20 to 30 kPa d) 40 to 60 psi e) 20 to 100 kPa

A common complaint against the fan coil unit with make-up air is: Choose one answer. a. The response is very slow when first turned on b. The unit must be shut off when the room is unoccupied c. The fan noise is excessive d. The fan stirs up a great deal of dust e. The unit requires too much maintenance

A common use for a DC generator is a) power supply for an elevator b) an automobile alternator c) power supply for a machinist lathe d) power factor correction e) computer room power supply

A common way to determine the mass of an object to be hoisted is by determining its Choose one answer. a. Density and volume b. Size and shape c. Density d. Weight e. Specific gravity

A compound gauge shows both: a. Pressure and vacuum b. Kilopascals and Pounds per square inch c. Pressure and temperature d. Pressure and head

A compound wound DC generator has a combination of shunt and___________________ characteristics, depending on the predominance of each type of winding. a) parallel b) resistive c) reverse wound d) series e) AC

A compound wound DC generator may have three characteristics which are a: 1. decreasing output voltage versus load 2. no amperage requirement 3. constant output voltage 4. supplementary AC requirement 5. rising output voltage versus load a) 1, 2, 4 b) 2, 3, 5 c) 1, 3, 5 d) 1, 4, 5 e) 2, 3,

A compression refrigeration system can be divided into two parts; a high pressure section carrying the head pressure and a low pressure section carrying the _____ pressure: Choose one answer. a. Discharge b. Back c. Hot d. Return e. Suction

A compressor seal is required to prevent: a. Refrigerant and oil leakage into the compressor b. Refrigerant and oil leakage along the shaft c. Prevent moisture from escaping the compresor d. Prevent dirt and moisture from leaving the compressor

A computer normally displays information to the operator via Choose one answer. a. a CRT or LCD b. an icon c. a CAD d. a Modem e. a CPU

A condensate receiver low level cutoff switch will: Choose one answer. a. Open a make-up solenoid b. Stop the feed pump thereby preventing damage to it c. Shut off the boiler d. Sound an alarm e. Cause the make-up valve to close

A conductor supplied with current while in a magnetic field will a) tend to move at right angles to the flux lines b) tend to remain stationary c) want to move with the flux lines d) have a current induced into it e) form a solenoid

A conductor's resistance is a) directly proportional to its cross-sectional area b) directly proportional to its diameter c) inversely proportional to its cross-sectional area d) not affected by the cross-sectional area e) measured in micro-Newtons

A control device which will change one form of energy into another form of energy is the a) controller b) logic device c) primary element d) transducer e) transmitter

A control loop controller a) does not require a set point value b) sends a signal to a primary element c) measures the manipulated variable value, eliminating the need of a primary element d) will always eliminate deviation e) constantly compares input signals to the set point

A control loop controller: Choose one answer. a. Operates without a set point b. Sends a signal to a primary element c. Measures the manipulated variable value, eliminating the need of a primary element d. Eliminates all setpoint deviation e. Constantly compares input signals to the set point

A control room operator notices that the stack temperature of the hot oil heater is increasing rapidly. The operator should: Choose one answer. a. Activate the emergency shutdown b. Call the shift boss on the intercom c. Send an operator out to see if there is smoke coming from the oil heater stack d. Wait to see if the temperature will come down again e. Alert the fire department

A control valve a) is always normally closed b) is a form of variable resistance in a piping system c) is nearly always reverse acting d) must be part of a cascade control system e) can, by itself, be part of a split range control loop

A device for measuring relative humidity is called a) a dew point tester b) an R.H. gauge c) an aspirating gauge d) a psychrometer e) a chronometer

A device that converts the measurement of a sensing device into a signal, is a a) controller b) logic device c) primary element d) relay switch e) transmitter

A device used to change the voltage and current from one level to another, is known as a/an a) conductor b) resistor c) alternator d) transformer e) power booster

A device used to convert audio tones to computer language is a: Choose one answer. a. Transmitter b. Multiplexer c. Plotter d. Modulator/demodulator e. CPU

A device used to position dampers and control valves is termed a) a controller b) a relay c) a transformer d) an actuator e) a temperature controller

A device used to position dampers and control valves is called: Choose one answer. a. A controller b. A relay c. A transformer d. An actuator e. A temperature controller

A device which will cause a visible light signal to become an instrument analog signal is the a) photoelectric transducer b) transmitter c) controller d) final element e) current-to-pneumatic transducer

A device which will cause a visible light signal to become an instrument analog signal is the: Choose one answer. a. Photoelectric transducer b. Transferor c. Controller d. PE switch e. Current-to-pneumatic transducer

A diesel hydrotreater in an oil refinery a) removes the sulphur and nitrogen compounds before the naphtha goes to the platformer b) removes the water from the crude oil c) only removes the water from the diesel d) removes the sulphur and nitrogen compounds from the diesel before the diesel goes to storage e) causes the heavy hydrocarbons to be transformed into lighter hydrocarbons

A diffuser pump: 1. has stationary guide vanes surrounding the impeller 2. has a higher efficiency than a volute type 3. has high suction lift 4. does not have to be primed a) 1 b) 3 c) 2, 3 d) 1, 2 e) 4

A digital input computer is protected from harmful voltages by means of a) splitter bars b) fuses c) isolating circuits d) circuit breakers e) stand-alone devices

A direct acting controller: Choose one answer. a. Increases its output signal on an increased input signal b. Increases its output signal on a decreased input signal c. Only handles direct acting inputs d. Only handles reverse acting inputs e. Decreases its output signal on an increased input signal

A direct expansion type evaporator that has more than 1 refrigerant circuit in it requires what to have even refrigerant flow in each circuit? a) A stop valve b) A purge valve c) A distributor d) A purge valve e) A thermal regulator

A disadvantage of the water tube or tubular boiler is a) its long warm-up period b) water treatment monitoring c) its thermal stresses d) the foundation requirements due to mass e) its high maintenance cost

A double-acting pump a) has two pistons on the pump end b) will always be driven by the steam pistons c) has two pistons on the driver end d) will have two slide valves e) is a positive displacement pump

A dressing tool is used to a) square the edges of a grinding wheel b) clean the measuring contact surfaces of a micrometer c) clean the grooves of a file d) fit a new handle into a hammer head e) re-set the teeth of a saw

A factor limiting the number of fins that can be used on coils is a) the diameter of the tube b) the temperature of the fluid in the tube c) the material that the tube is made of d) the resistance to airflow e) the direction the fluid is flowing in the tube

A feedwater make-up system should a) utilize demineralizers b) utilize a deaerator c) be able to satisfy normal firing needs d) always be softened water e) be able to satisfy the needs of at least one boiler in a multiboiler plant

A fire eye or flame scanner keeps the burner circuit energized as long as the burner flame is maintained. This is accomplished using a: Choose one answer. a. Control valve b. Recorder c. Thermocouple d. Photoelectric transducer e. Controller

A fired heater which is installed on the location where the heat is needed and heats the air directly without the use of any ducting is called a: Choose one answer. a. Unit heater b. Unit ventilator c. Convector d. Fin-coil heat exchanger e. Rooftop unit

A flame control switch: Choose one answer. a. Varies electrical current to a modutrol motor b. Will start and stop a boiler c. Cannot have its settings adjusted d. Will not result in simultaneous adjustment of air and fuel e. Eliminates the need for a high limit control

A flame failure device a) must be installed on every high pressure boiler b) will shut off the steam leaving the boiler c) will control the pressure of the boiler d) will shut off the fuel to the burner e) will shut down the flame in the boile

A flame failure device is unresponsive to: Choose one answer. a. Ultraviolet light b. Infra-red light c. Visible light d. Fuel flow e. Heat

A flame scanner (1) requires a photoelectric cell (2) responds to temperature changes (3) requires a clear line of sight to the flame (4) produces a steady voltage signal a) all of the above are correct b) 1 & 2 are correct c) 1, 2, & 4 are correct d) 1 & 3 are correct e) none of the above

A flame scanner: Choose one answer. a. uses a pilot-stat b. Responds to temperature changes c. conducts current through the flame d. Requires a clear line of sight to the flame e. Produces a steady voltage signal

A flapper-nozzle assembly is basic to all a) controllers b) transmitters c) recorders d) pneumatic devices e) actuators

A float operated mechanical feeder valve in a secondary feedwater supply should: Choose one answer. a. Be a normally closed valve. b. Open just after the low-water cutoff switch opens. c. Be located above the water column. d. Not open until the level is well below the feed pump cut-in level. e. Not be deemed a stand-by device

A function of a Bourdon tube gauge hairspring is to a) return the tube to its zero position b) keep the pointer on zero c) eliminate backlash or play in the pointer d) return the pointer to zero

A gas sweetening unit in an oil refinery a) uses heat only to drive off the hydrogen sulphide from the sour gas b) uses an amine contactor to absorb the hydrogen sulphide from the sour gas c) uses an amine contactor to absorb the hydrogen sulphide from the crude oil d) uses amine solution to absorb the hydrogen sulphide from the gasoline e) uses heat only to drive off the hydrogen sulphide from the crude oil

A gas sweetening unit in an oil refinery uses: Choose one answer. a. Heat to drive off the hydrogen sulphide from the sour gas b. An amine solution to absorb the hydrogen sulphide from the sour gas c. An amine solution to absorb the hydrogen sulphide from the crude oil d. Amine solution to absorb the hydrogen sulphide from the gasoline e. Heat to drive off the hydrogen sulphide from the crude oil

A gas turbine compressor is usually a) centrifugal type b) downstream of the turbine c) dynamic axial design d) downstream of the combustor e) driven by a motor

A gas turbine is not self-starting. It must be rotated at __________ of its maximum speed before fuel is turned on. a) 10% to 30% b) 15% to 30% c) 20% to 30% d) 25% to 30% e) 25% to 50%

A gas turbine performs most effectively if a) lube oil is of the proper viscosity b) cooling water temperature is kept low c) ambient air temperature is high d) ambient air temperature is low e) loaded immediately after starting

A hot water boiler operating control can be a pressure switch: Choose one answer. a. That is normally open b. That is sensitive to the expansion and contraction of boiler water c. Utilizing a closed liquid filled system d. That is sensitive to system steam pressure e. That is sensitive to boiler steam pressure

A hot water heating system circulator should a) be directly coupled b) have its own vibration-free base c) be very quiet in operation d) develop an extremely high differential pressure e) not run continuously

A hot water heating system is also known as a _____ heating system. Choose one answer. a. Warm air b. Circulation c. Loop d. Hydronic e. Radiant panel

A hot water system which circulates water through the pipes with a pump is known as a: Choose one answer. a. Circulating system b. Forced circulating system c. Pumped system d. Gravity system e. Return system

A hydra motor valve a) opens and closes quickly b) is slow to open and quick to closed c) uses air as its working medium d) should not be the last fuel valve to open

A knot used to pull at right angles to a pipe or pole is the a) timber hitch b) round turn and two half hitches c) bowline d) reef knot e) clove hitch

A large journal bearing which is running hotter than normal can be cooled by a) direct application of cool water b) loosening the bearing caps c) decreasing the viscosity of the oil by cooling it d) adding pour point depressant to the oil e) using CO vapour 2

A large reaction turbine will have a) no thrust bearings b) steam pressure dropping in only the moving sections c) blades which are basically symmetrical in cross-section d) never more than 5 stages e) steam pressure dropping through moving and stationary sections

A lead sulfide cell is sensitive to IR rays and a) its resistance to current flow varies inversely with ray emissions b) its resistance to current does not change during operation c) will not sense steady IR rays, only pulsating ones d) will not respond to glowing hot refractory e) must be replaced at least monthly

A lead sulphide cell is sensitive to IR rays and a) its resistance to current flow varies inversely with ray emissions b) its resistance to current does not change during operation c) will not sense steady IR rays, only pulsating ones d) will not respond to glowing hot refractory e) must be replaced at least monthly

A levelling indicator is found on a) the casing of a heating boiler b) a low-water fuel cutoff switch c) a boiler feedwater pump d) a modutrol motor e) an ON-OFF operating control switch

A low fire switch a) is a type of manual over-ride b) takes no part in the start-up of an automatic boiler c) is a normally closed switch d) utilizes a thermal element for its operation e) acts as an interlock to ensure minimum damper setting

A low hot oil flow shutdown (FSDL) ____________ installed in the outlet line of an oil heater. a) is almost always b) is always c) is sometimes d) is never e) cannot be

A low temperature catalytic heater contains a layer of: Choose one answer. a. Metal impregnated with a ceramic material b. Wool fiber impregnated with a catalyst c. A ceramic mat impregnated with a catalyst d. Glass wool impregnated with a catalyst e. Porous glass impregnated with a catalyst

A low water fuel cut-off is fitted to a boiler to prevent a) damage to the radial stays in the steam dome b) the fire from shutting off too quickly and damaging the boiler c) shutting off the water when there is no fuel d) damage to the boiler from an overheated condition e) damage to the boiler from over pressure

A low water fuel cut-off may be activated by a) lowering the water level in the boiler b) lowering the water level with the try cocks c) lowering the water level in the gage siphon d) lowering the water with the surface blowdown e) lowering the water level in the sight glass

A low-water fuel cutoff switch should close the automatic fuel valve(s) when the water level is a) at the lowest permissible water line b) at the lowest visible water line c) 1 to 2.5 cm above the bottom gage glass nut d) 1 to 2.5 cm below the gage glass nut e) 76 mm above the lowest permissible water line

A low-water fuel cutoff which serves no other purpose a) cannot be equipped with isolation valves b) must be a normally closed switch c) must be a manually reset switch d) must be a float activated switch e) cannot be an electrical conducting type

A lubricant characteristic which will indicate its ability to support a heavy load at low speed is a) viscosity index b) pour point c) viscosity d) density e) relative density

A luminary is a a) type of light reflector b) type of light refractor c) lamp ballast d) complete lighting unit e) type of lamp

A main advantage of steam grid humidifiers over steam pan humidifiers in HVAC systems is? Choose one answer. a. Steam grid humidifiers can use inexpensive 2-position controls b. There is minimal response-time lag with steam grid humidifiers c. Steam grids can achieve higher relative humidity d. Steam grids do not require humidistat e. Steam grids humidifiers require less space

A main advantage of steam type humidifiers over pan type humidifiers is that a) steam type humidifiers are inexpensive b) there is minimal time lag with steam type humidifiers c) steam types can achieve higher relative humidity d) steam types do not require a humidistat e) steam type humidifiers require less space

A major difficulty encountered with a two-stroke cycle engine is a) the high torque at low speeds b) maintenance of many moving parts c) the difficulty in cold weather starting d) the high speeds compared to an equivalent four stroke engine e) exhausting the spent gases from the cylinder

A manual "high-low" switch should be switched to "high" or "auto": Choose one answer. a. As soon as the main flame has stabilized b. Prior to ignition of the main flame c. When pressure is too low d. When the boiler has been properly warmed up e. During boiler pre-purge

A material which is commonly used as a solid lubricant is a) tallow b) molybdate sulphide c) lime d) molybdenum disulphide e) sodium carbonate

A measure of comfort that involves the combined effects of the dry bulb temperature, relative humidity and air movement is defined as: Choose one answer. a. Comfort zone b. Effective temperature c. Comfort condition d. Shock effect e. Psychrometric climate

A membrane water wall a) is usually not gas-tight b) consists of a metal sheeting in front of the tubes c) has metal connecting the tubes d) has firebrick in front of the tubes e) is applicable to an externally

A mercury switch bulb is under high vacuum and contains inert gas: Choose one answer. a. So it will not explode b. To prevent corrosion of the contacts c. To decrease electrical resistance d. So contacts will not overheat e. Because the switch is normally closed

A mixing box is an example of which kind of damper? a) A manual damper b) A modulating damper c) A two-position damper d) A relief damper e) A louver

A modulating capacity mechanical atomizing oil burner is also called an? a. Constant capacity b. Steam atomized c. Wide range atomizer d. Centrifugal Cup

A modulating control steam heating boiler: Choose one answer. a. Is always fully automatic b. Will have a narrow operating pressure range c. Maintains a steady boiler pressure d. Will have a constant combustion air, flow rate e. Cannot be adjusted

A modulating control valve a) can be over sized b) is used for steam coils where the condensate is lifted to an overhead return c) is used for steam coils when the entering air temperature is below 1.5 degrees C d) can be used to control steam coils when the entering air temperature is above 1.5 degrees C e) is not used to control steam coils at any air inlet temperature

A modulating pressure atomizer has its return oil flow regulated by: Choose one answer. a. A modulating valve to the burner b. A modulating valve in the return line c. A solenoid valve in the return line d. A pressure regulator e. Pump speed

A multi- burner cluster has secondary and tertiary nozzles ignited by a) an igniter spark b) an intermittent pilot flame c) the primary burner d) an interrupted pilot

A multi-stage pump would be used a) when the lift is great b) when a greater volume must be pumped c) when the head is great d) when the temperature of the water being pumped is high e) whenever there is sufficient boiler room floor space

A multiplexing sequence may be repeated as frequently as Choose one answer. a. Once per hour b. Twice per minute c. Twice per second d. Four times or more per second e. Fifty times per second

A multiplexing sequence may be repeated as high as a) once per hour b) twice per minute c) twice per second d) four times per second e) fifty times per second

A non-bleed controller bleeds control air: Choose one answer. a. When the supply pressure is decreased b. When the supply pressure is increased c. Non-bleed controllers do not bleed air d. When the control air pressure is increased e. When the control air pressure is decreased

A non-metallic part of a mechanical seal might be made from a) asbestos b) teflon c) fibreglass d) rubber e) carbon

A normal anti-friction bearing temperature operating range is a) 150 to 160 degrees C b) 120 to 250 degrees C c) 20 to 50 degrees C d) 65 to 70 degrees C e) 80 to 120 degrees C

A packaged steam boiler modulating combustion control system will routinely a) maintain drum level within a desired range b) maintain flue gas temperature at some set point c) alter fuel flow without changing the air flow d) satisfy all load demands regardless of capacity e) maintain boiler steam pressure within a desired range

A packaged steam boiler modulating combustion control system will routinely: Choose one answer. a. Maintain drum level within a desired range b. Maintain flue gas temperature at some set point c. Maintain boiler steam pressure within a desired range d. Satisfy all load demands regardless of capacity e. Alter flue flow without changing the air flow

A pressure balancing arrangement that prevents the boiler pressure from forcing boiler water into the return lines is called a: Choose one answer. a. Relief valve b. Check valve c. Pipe siphon d. Back-flow preventer e. Hartford loop

A pressure or altitude gauge for a hot water heating boiler: Choose one answer. a. Must be calibrated in kPa b. Shall have a dial scale at least three times the maximum allowable working pressure c. Does not require a siphon d. Must have a temperature dial e. Must be of 51 mm pipe size

A pressure relief device on a refrigeration system shall have sufficient capacity to prevent the pressure in the pressure vessel from rising more than _____ above the setting of the pressure relief device. Choose one answer. a. 10% b. 15% c. 103 kPa d. 25% e. 50%

A pressure sensor converts pressure changes into a) an electrical signal b) a change in electrical resistance c) variables such as voltage, current, or resistance d) air pressure e) a temperature change

A prime factor in determining the voltage to be used in a circuit is a) transformer capacity b) peak demands c) degree of access to equipment d) the number of motors involved e) the resistance of the circuit

A prime mover is a) an electric motor b) a steam turbine c) a centrifugal pump d) an air compressor e) a boiler

A process used in refineries to separate components by using the property of different boiling temperatures is: Choose one answer. a. Platforming b. Stabilization c. Absorption d. Catalytic cracking e. Fractional distillation

A process variable which is adjusted in order to maintain or achieve some desired value of another variable is termed the a) process variable b) final variable c) manipulated variable d) controlled variable e) transmitting variable

A process variable which is adjusted in order to maintain or achieve some desired value of another variable is termed the: Choose one answer. a. Process variable b. Final variable c. Manipulated variable d. Controlled variable e. Transmitting variable

A property of a magnet is that it will always point in the north and south direction, when a) submerged in oil b) charged with electricity c) it is demagnetized d) in the presence of iron filings e) freely suspended in the air

A proportional controller: Choose one answer. a. Is also called a multi-position controller b. Provides a proportional output based on the error between process variable and set-point c. Does not allow operator input d. Provides on-off control e. Allows the process variable to always be maintained at the set-point

A proportional only controller a) cannot maintain maximum value of the final element b) cannot maintain set point except at 50% c) can be compared to the cruise control on an automobile d) will maintain measured variable at set point e) will respond fully when deviation is high

A proportional-only controller: Choose one answer. a. Are mostly used for on/off control. b. Compare actual conditions to controller outputs. c. Must provide reset action. d. Cannot always maintain the process variable exactly at the set-point. e. Are sometimes called Multi-position controllers

A pump is capable of suction lift due to a) its ability to convert kinetic energy into potential energy b) the speed at which it operates c) its input power d) its size e) atmospheric pressure

A purpose of a liquid refrigerant control or regulating valve (expansion valve)is to: Choose one answer. a. Drain the receiver b. Regulate the refrigerant flow to the condenser c. Maintain a constant level in the receiver d. Regulate the cooling water to the condenser e. Meter the flow of refrigerant to the evaporator in response to the evaporator load

A purpose of a liquid refrigerant control or regulating valve is a) to drain the receiver b) to regulate the refrigerant flow to the evaporator c) to maintain a constant level in the receiver d) to regulate the cooling water to condenser e) to isolate the high side from the low side

A radiator valve is used to control the amount of: Choose one answer. a. Air leaving the radiator b. Condensate leaving the radiator c. Steam leaving the radiator d. Air entering the radiator e. Steam entering the radiator

A recorder utilizing a spiral Bourdon tube will have a pen movement a) linear to the tube travel b) proportional to the change in tube pressure c) angular to the tube travel d) range of 0 to 24 hours e) range of 0 to 7 days

A refrigerant in the "B" Group that is used more than others in its group in refrigeration systems is: Choose one answer. a. R-290 b. Ammonia c. R-134a d. R-22 e. CO2

A refrigeration compressor's oil pressure failure switch uses a _________ element as part of its operating mechanism. Choose one answer. a. Fluid expansion b. Bimetallic c. Thermostatic d. Humidity activated e. Volumetric

A refrigeration system circulates warm brine back to a chiller. Which of the following statements about this system is true? Choose one answer. a. The condenser in the system is located in direct contact with the material being refrigerated b. The evaporator in the system is located in direct contact with the material being refrigerated c. The brine or water is the refrigerant d. The evaporator cools the brine e. The system is a direct refrigeration system

A refrigeration system contains 30 kg of an A1 refrigerant. Which of the following system locations does NOT require a stop valve, according to CSA B52 code? Choose one answer. a. Suction inlet of each compressor b. Discharge outlet of each compressor c. Suction inlet of each condensing unit d. Discharge outlet of each condensing unit e. Suction inlet of each liquid receiver

A rung ladder should a) never be able to conduct electricity b) not be equipped with rubber feet, only metal ones c) be inclined with a 5:1 slope d) always have at least one rail touching the support e) be inclined with a 4:1 slope

A safety control designed to protect the chiller from freezing is the: Choose one answer. a. Vane closed switch b. Low oil pressure shut down switch c. Motor demand limiter d. Chilled water flow switch e. Purge unit

A screwdriver having a square tip is known as type. a) a slot b) an allen c) a robertson d) a phillips e) a jacobson

A semi-solid lubricant: a) can only be used for high temperature services b) has a low viscosity c) is less likely to drip or splash from bearings d) has a low pour point e) is best suited for heat removal

A sensing element responds to the value of the Choose one answer. a. Controller b. Recorder c. Control valve d. Transducer e. Controlled variable

A sensing element sends its signal to Choose one answer. a. a Transmitter b. an air line c. a Conveyer d. a Flapper and nozzle e. a Recorder

A sensing element sends its signal to a: Choose one answer. a. Transmitter b. Controller c. Control valve d. Recorder e. Process variable

A steam boiler must be equipped with two low water fuel cut-off devices when the boiler: Choose one answer. a. Has over 47 m² of heating surface b. Has dual fuels c. Is not continuously attended d. Uses coal as fuel e. Has two burners c

A steam heating boiler that is to be shut down for six months during the summer, should be: Choose one answer. a. Drained, thoroughly dried out, have desiccant placed inside and be left open b. Drained, thoroughly dried out, have desiccant placed inside and be closed up c. Left with the water at normal working level but opened up to atmosphere d. Left with the water at normal working level and pressurized with air to 50 kPa e. Filled completely with water and the vent left open to atmosphere

A steam turbine should trip or shut down when normal operating speed is exceeded by a) 250 RPM b) 3 to 5% c) 50 RPM d) 10 to 15% e) 25 RPM

A steam turbine's exhaust can often supply a process with steam because a) processes always require a lower steam pressure b) processes never require the high steam temperatures turbines do c) turbine exhaust steam is always dry and saturated d) it is free of oil e) the steam will be at a temperature above the initial temperature

A strand of fiber rope Choose one answer. a. Is normally 20 meters in length b. Will un-twist if subjected to a heavy load c. Is the smallest component of the rope d. Is composed of yarns with a left-handed twist e. Is the most important part of the rope

A strand of fibre rope is a) at least 20 metres in length b) composed of fibres twisted right-handed c) the smallest component of the rope d) composed of yarns twisted left-handed e) the most important part of the rope

A stuffing box: a)1. stops air leaking into the casing when the pressure is below atmospheric b)2. decreases leakage out of the casing when the pressure is above atmospheric c)3. is always supplied with a lantern ring d)4. is filled with packing e) 124

A system used extensively in hotels and motels due to its minimal space requirement, relatively low initial cost, and high degree of individual zone control is called a) a hydronic heat pump system b) an induction system c) a variable volume system with perimeter heating d) a fan coil unit with make up air system e) a compartmental atomizing system

A system which provides cooling and heating all year round is highly energy efficient but has a high initial cost. The system consists of two separate supply and return piping systems which are connected to separate coils. Which of the following systems fits this description? a) A single pipe system b) A four pipe system c) A hydronic heat pump system d) A three pipe system e) A two pipe system

A tap with the marking M4 would indicate a: Choose one answer. a. High-strength alloy steel tap b. Metric thread, 4 mm nominal diameter c. Metric thread, 4 cm nominal diameter d. Metric thread, 4 threads per mm e. Tap with metallic threads

A taper tap is tapered from the end for approximately a) 2 threads b) 3 threads c) 4 threads d) 6 threads e) 8 threads

A thermocouple will produce a DC millivoltage which a) will be read on a pressure scale b) will be fully proportional to a temperature difference c) increases as temperature decreases d) is not quite proportional to temperature differences e) varies inversely with temperature

A thermostat which is sometimes installed in the return air duct serves which main function? a) To limit temperature of the heated outside air b) To control the throttle of the steam in the tubes c) To sense the temperature of the steam in the coils d) To minimize temperature fluctuations in discharge air e) To heat recirculated air

A thrust bearing a) prevents radial movement of the shaft b) prevents axial movement of the shaft c) must be installed on both ends of the shaft d) has a volute casing e) should rotate opposite to the shaft

A thrust bearing which does not utilize the oil wedge principle of lubrication is the a) Mitchell type b) collar type c) flotation type d) Kings-bury type e) vertical type

A time delay oil valve a) opens when the pump starts b) opens once ignition is verified c) opens on flame failure d) is located on the return line e) is upstream of the pressure regulating valve

A time delay oil valve: Choose one answer. a. Opens when the oil pump starts b. Opens 5 to 15 seconds after ignition begins. c. Opens on flame failure d. Is located on the return line e. Is upstream of the pressure regulating valve

A transducer is a device that is used to: Choose one answer. a. Generate a set point b. Produce an off or on signal c. Convert direct acting to reverse acting d. Amplify an electronic signal, or convert it to another energy form e. Filter an electronic signal

A transformer has a primary voltage of 500 volts and 20 turns on the primary winding. If the secondary winding has 5 turns the voltage of the secondary is Sv = Pv X St/Pt a) 2000 volts b) 2500 volts c) 125 volts d) 100 volts e) 4 volts

A transformer is a device that is used to change: Choose one answer. a. AC amperage to DC amperage b. AC voltage from one value to another c. DC amperage from one value to another d. DC voltage to AC voltage e. low power to high power

A transformer works on the principle of a) reverse polarity b) magnetic induction c) DC power flowing in one direction d) straight polarity e) automatic induction

A triple pole single throw switch is one a) which opens and closes three wires of an electric circuit b) that has three magnetic poles c) which is used for three phase circuits only d) which cannot be operated manually e) which requires three toggles

A tube beading tool a) is used on wate rtube boilers b) is used on fire tube boilers c) is used to fasten the stays in the tube sheet d) is used to cut fire tubes e) is used to unfasten fire tubes from the tube sheet

A tube beading tool is used: Choose one answer. a. On water tube boilers b. On fire tube boilers c. To fasten the stays in the tube sheet d. To cut fire tubes e. To unfasten fire tubes from the tube sheet

A two cycle engine a) must always have lube oil premixed with the fuel b) can never have a crankcase lubrication system c) can never be operated in an inverted position d) "pops" twice as often as an equivalent cylinder four stroke engine e) gives one power stroke every other crankshaft revolution

A typical extra low voltage device would be a a) toaster b) set of tree lights c) door bell d) dry cell battery charger e) night light

A typical stationary crankshaft seal consisting of a metallic bellows soldered at one end to a ring (seal nose) which bears either against a shoulder on the shaft or against a seal ring on the shaft is called a a) packing gland seal b) diaphragm seal c) bellows seal d) rotating mechanical seal e) setscrew seal

A typical use of a mainframe computer system in a process would be a) the operation of a modulating control valve b) acting as a "host" computer c) producing hard copies of a plant system d) producing graphics of a plant system e) storing information onto a floppy disk

A valve actuator a) cannot be reverse acting b) will always have one side of the diaphragm open to atmosphere c) is a two-position device d) position is a function of controller output e) causes a valve to always fail open

A valve body that seals on the down stroke is: Choose one answer. a. Reverse acting b. Single sealed c. Direct acting d. Double sealed e. Unidirectional

A valve which gives good throttling action, takes less actuator force, but does not seal well is a: Choose one answer. a. Double seated valve b. Reverse acting valve c. Multiple-disc valve d. Single seated valve e. Direct acting valve

A valve which prevents water flow over the fill of a tower during cold weather should not be closed until the temperature reaches a) - 0.5 degrees C b) + 0.5 degrees C c) + 5 degrees C d) + 20 degrees C e) + 27 degrees C

A variable air volume HVAC system requires static pressure control on the _______ air duct system. Choose one answer. a. Return b. Supply c. Ventilation d. Exhaust e. Recycled

A ventilation V system leading from a fume hood in a chemistry lab would have which duct material used for its duct work? a) Galvanized steel sheet metal b) Aluminum sheet metal c) Cement asbestos d) Black steel sheet metal e) Fiberglas

A very important requirement for a pneumatic control system is a) maximum transmitter output signal pressure must be maintained b) air supply must be clean and dry c) tubing diameters must be kept large d) noise attenuation must be used at each bleed device e) a proper sized compressor which will run continuously

A voltmeter is connected to a circuit a) in series b) in series and parallel c) in series and shunt d) in parallel e) between the last resistance and the source

A volute type pump a) is a positive displacement pump b) has a progressively expanding spiral casing c) reduces the velocity in the discharge nozzle d) is more costly than diffuser pumps e) is a regenerative type pump

A water tank should be installed above the boiler and attached to the vent connection during a wet lay up in order to a) permit the injection of chemicals b) prevent air from entering the boiler during water contraction c) hold the manway doors closed d) prevent water vapour from entering the power plant e) prevent the wastage of chemicals

A/an _____ valve is needed to keep a hot water heating system with a closed expansion tank automatically filled and under proper pressure. Choose one answer. a. Feed water control b. Pressure relief c. Expansion d. Pressure reducing e. Hydramotor

According to CSA B52 code, refrigerant discharge from a pressure relief device to the atmosphere shall not be less _____ from any window, ventilation opening or exit in any building. Choose one answer. a. 4 m b. 4.6 m c. 6.5 m d. 7.6 m e. 10 m

According to code, the scale of a pressure gauge for a steam heating boiler shall be graduated between Choose one answer. a. 100 to 300 kPa b. 200 to 414 kPa c. 200 to 300 kPa d. 125 to 325 kPa e. 230 to 414 kPa

According to the ASME Code Section IV steel or wrought iron pressure gauge connections are to be a minimum of ____ mm in pipe size. a) 6.35 b) 21.3 c) 12.7 d) 19.05

Air conditioning involves a) only the cooling of the air in a conditioned space b) the control of the air temperature, the control of humidity, air circulation, and the removal of contaminants c) only the control of air temperature d) only the control of humidity and temperature e) only air purification

Air conditioning with respect to heating coils is achieved in which of the following ways? a) A combination of tempering control functions b) The selected mixing of warm return air and cooler outside air c) Selective heating by passing air through the heating coils d) Proportioning the amount of air flow through the face damper for heat addition, or through the bypass dampers for no heat addition. e) All of the above

Air dampers used for HVAC service are Choose one answer. a. Parallel blade types only b. Single blade types only c. Opposed blade, parallel blade, and single blade types d. Opposed blade types only e. Made of fiberglass

Air filters can be divided into two groups: Choose one answer. a. Permanent and disposable b. Washable and dry-clean only c. Dry and viscous d. HEPA and MERV e. Mechanical and electronic

Air in a hot water heating system is directed to the: Choose one answer. a. Relief valve b. Boiler c. Radiator vents d. Expansion tank e. Atmosphere

Air is approximately what composition by volume? a) 79% N and 21% CO 2 2 b) 79% O and 21% N 2 2 c) 79% N and 21% O 2 2 d) 79% CO and 21% O 2 2 e) 79% H and 21% H O vapour 2 2

Air louvers a) are often used for mixing boxes b) are always used for fire and smoke dampers c) are suited for two position damper operation d) are used in fresh air intake openings to minimize the amount of water and snow entering the air handling system e) are used as relief dampers

Air louvers, installed in HVAC systems, are: Choose one answer. a. Often used for mixing boxes b. Always used for fire and smoke dampers c. Suited for two position damper operation d. Used in fresh air intake openings to minimize the amount of water and snow entering the air handling system e. Used as relief dampers

Air receivers a) must have a gage glass b) must have a thermometer c) must have a high pressure alarm d) must have a safety valve e) must have a high water alarm

Air tends to collect in the high spots of piping and heating units in hot water heating systems, which could: Choose one answer. a. Increase the temperature of the system, due to the partial pressure of the air b. Cause the circulating pumps to cavitate c. Restrict the flow of water d. Restrict the airflow e. Cause other parts of the heating system to overheat

Air used for ventilating purposes in an office building should be kept within a certain range of relative humidity as indicated below: Choose one answer. a. 30 to 50% b. 30 to 70% c. 40 to 50% d. 50 to 60% e. 10 to 30%

Air used for ventilating purposes in an office building should be kept within certain range of relative humidity as indicated below. a) 30 to 50 b) 30 to 70 c) 40 to 50 d) 50 to 60 e) 10 to 30

Air ventilation is based on the larger of these two requirements: a) solar heat rate and CFM rate per person b) conduction rate per person and solar heat rate c) CFM rate and conduction rate per person d) infiltration rate and CFM rate per person e) none of the above

Air venting is required for which of the following reasons? a) To assure adequate water distribution in supply and return lines b) To assure adequate air distribution in supply lines c) To assure adequate air distribution in return lines d) To maintain face velocity e) All of the above

Air vents are a) not required when an inverted bucket steam trap is used b) not required on the steam mains if an inverted bucket steam trap is used at the steam coil c) not required at the steam coil if a float and thermostatic (F & T) trap is used at the steam coil with an atmospheric return and the steam main is adequately vented d) not required anywhere if a float and thermostatic (F & T) trap is used at the steam coil e) required only with hot water coils

Air washers used in air conditioning systems a) only clean the air b) only clean and cool the air c) only humidify and dehumidify the air d) humidify, heat, cool, dehumidify, and clean the air e) only humidify, cool, and clean the air

Air washers used in air conditioning systems achieve cooling and dehumidification by a) heating the spray water to a temperature above the dry bulb temperature of the entering air b) cooling the spray water to a temperature below the dew point temperature of the entering air c) cooling the entering air below its dry bulb temperature d) heating the entering air above its dry bulb temperature e) heating the spray water to a temperature above the dew point temperature of the entering air

Air washers used in air conditioning systems achieve heating and humidification by a) cooling the spray water to a temperature below the dew point of the entering air b) cooling the spray water to a temperature below the dry bulb temperature c) heating the spray water to a temperature above the dry bulb temperature of the entering air d) heating the entering air above its dry bulb temperature e) cooling the entering air below its dry bulb temperature

Air washers used in air conditioning systems achieve simultaneous cooling and humidification by: Choose one answer. a. Heating the spray water to a temperature above the dry bulb temperature of the entering air b. Cooling the spray water to a temperature below the dew point temperature of the entering air c. Using spray water that is above the dewpoint of the entering air, but cooler than the dry bulb temperature d. Heating the entering air above its dry bulb temperature e. Cooling the spray water to below the dry bulb temperature of the incoming air, but above its wet-bulb temperature

Air washers, used in HVAC systems, cannot: Choose one answer. a. Cool air b. Remove tobacco smoke c. Dehumidify air d. Heat air e. Clean air

Air-cooled condensers of large capacity are found mainly in which of the following locations? a roof tops b) closed rooms with low air circulation c) warm dry rooms d) cold rooms with low air circulation e) any of the above

All refrigeration evaporators: Choose one answer. a. require regular defrosting b. are part of the high side of the system c. are located between the expansion valve and the king valve. d. are flooded with refrigerant e. boil liquid refrigerant at low pressure and low temperature

All supply and drain lines of a steam heating system must be pitched to: Choose one answer. a. Allow for drainage of condensate b. Allow collection of air at the highest points c. Prevent corrosion d. Allow for thermal expansion e. Allow steam to rise to the system high points.

Alternators must run at constant speed in order to maintain a) current b) power c) voltage d) resistance e) frequency

Ambient lighting can be improved by using two types of lighting: Choose one answer. a. Direct and indirect b. Natural and artificial c. Florescent and incandescent d. Reflective and refractive e. General and local

Ammeters are connected with the negative or black lead connected to the a) positive side of the circuit b) north pole of the circuit c) negative side of the circuit d) switch of the circuit e) neutral wire of the circuit

Ammonia is explosive in concentrations between? A. 5 to 10 % b. 11 to 14 % c. 16 to 25 % d. 26 to 31 % e. 32 to 40 %

Ammonia is the only commonly used refrigerant which has the physical property of a) miscibility b) enthalpy c) flammability d) density e) low condensing pressure

Ammonia refrigerants a) have high sensible heat capacity b) mix well with oil c) are very expensive d) are well suited for industrial refrigeration e) are ideally suited to copper piping systems

Ammonia systems are seldom used for air conditioning purposes in large buildings mainly because a) ammonia systems require too much maintenance b) ammonia systems are too expensive c) ammonia is too toxic d) ammonia does not provide sufficient cooling power for large operations e) ammonia systems require a separate power supply not available in most large buildings

Ammonia, as well as being toxic, is also : Choose one answer. a. Miscible b. Odourless c. Flammable d. Dense e. A low pressure refrigerant

An AC motor which will drop out of synchronize and simply trip when overloaded is the a) slip-ring induction motor b) induction motor c) wound rotor induction motor d) synchronous motor e) single phase motor

An M24 course thread bolt has a) 3 threads per mm b) 3.5 threads per mm c) 3 mm per thread d) 3.5 mm per thread e) 2 mm per thread

An ON-OFF steam boiler: Choose one answer. a. Will maintain a fairly constant steam pressure b. Operates most efficiently at continuous firing c. Will cycle on and off based on temperature d. Must have a low capacity e. Cannot operate in a multi-boiler system

An active current transformer should never a) be inspected until properly grounded b) have its primary circuit opened c) produce excessively high voltage d) have its secondary circuit opened e) have its secondary connected to a meter

An active current transformer should never a) be inspected until properly grounded b) have its primary circuit opened c) produce excessively high voltages d) have its secondary circuit opened e) have its secondary connected to a meter

An advantage of a packaged low pressure tubular or water tubes boiler is a) its ability to meet load changes due to its heat reserve b) its less critical water treatment requirement c) its lower initial cost d) easier waterside maintenance e) safety due to the low volume of water it contains

An advantage of an electronic control system is that a) the controllers can accept a wide variety of inputs b) they are inexpensive to operate c) they are inexpensive to install d) the controllers can be used outdoors e) it is very compact

An air vent is partially filled with volatile liquid so that: Choose one answer. a. When hot steam surrounds cylinder, it causes the needle valve to open. b. When relatively cool air surrounds the cylinder, it causes the needle valve to open c. When relatively cool air surrounds the cylinder, it causes the needle valve to close d. Then operating mechanism will be protected from live steam e. The air will flow in one direction only

An automatic feed water regulator is used to a) take the place of the boiler feed pump b) activate the low water fuel cut off c) maintain a constant water level in the boiler d) control the chemical feed treatment to the boiler e) control the feed water pump output

An automatic fill valve for a hot water boiler: Choose one answer. a. Will maintain maximum system pressure at all times b. Operates to maintain a constant boiler water level c. Is not mandatory d. Operates to maintain a constant expansion tank level. e. Can be used with an open tank system

An electronic control system is comprised of a: Choose one answer. a. Meter, sensor, and valve b. Sensor, controller, and final control element c. Sensor, transmitter, and thermostat d. Controller, thermostat, and sensor e. Thermostat, electronic controls, and furnace

An electronic controller is a) not part of the electronic control system b) used to position an actuator c) used to generate a set point d) a type of sensor e) used only in pneumatic systems

An electronic controller is: Choose one answer. a. Operated on variable current signals b. Used to position an actuator c. Cannot interpret variable voltage inputs d. Operate only as on-off controls e. Convert 2-poition inputs to proportional outputs

An electronic filter is also known as: Choose one answer. a. an ionic filter b. a HEPA filter c. a static filter d. an air-purifier e. an electrostatic filter

An engine which develops one power stroke with every other turn of the crankshaft is the a) two stroke diesel engine b) type which requires pre-mixing lube oil and fuel c) four stroke natural gas engine d) V type engine e) external combustion unit

An essential fitting between the boiler and the steam pressure gauge is a a) check valve b) gate valve c) gauge glass d) siphon

An evaporator that contains only a small amount of liquid refrigerant at any time is what type of evaporator? a) Dry evaporator b) Flooded evaporator c) Wet evaporator d) All of the above e) None of the above

An evaporator which can easily be cleaned and defrosted manually without interrupting the cooling process is which type of evaporator? a) Bare finned b) Finned c) Plate surface d) Shell and tube e) None of the above

An example of a controlled device would be a) a damper motor operating air louvers b) a hot water boiler c) a radiator d) a steam boiler e) a thermostat

An example of an auxiliary device for a pneumatic control system would be a a) reducing valve b) three way air valve c) damper d) pump e) bellows

An example of an auxiliary device for a pneumatic control system would be a: Choose one answer. a. Reducing valve b. Three way air valve c. Damper d. Pump e. Bellows

An example of an engine which gives high torque at low speeds would be that of a a) chain saw b) two cycle snowmobile c) four stroke motocross motorcycle d) two cycle lawnmower e) two cycle transit bus

An example of final control device for a heating system is a) slide-gate b) pump c) fan d) set of louvers e) all of the above

An expansion tank is used to: Choose one answer. a. Dampen pulsations in the water pressure b. Increase water temperature c. Allow for the expansion of the water d. Provide more efficient water circulation e. Allow free expansion of the steam

An eye made by using a Crosby clip will have a strength factor of a) 80% b) 50% c) 95% d) 75% e) 90%

An inclined manometer is commonly used a) when very low pressures or vacuums are being measured b) to measure high pressure differentials c) in conjunction with a flexible rubber diaphragm d) when reading accuracy is not critical e) for measuring level

An increased air flow increases heat loss of the body by which of the following methods: i) convection ii) conduction iii) evaporation a) only b) ii only c) i and iii d) i and iii e) i, ii, and iii

An indication of a pressure gauge not performing properly is: Choose one answer. a. The needle fluctuating b. The needle not returning to zero when gauge is depressured c. The safety valve popping when gauge reads normal d. A reading that is not the same as some other gauge e. A dial that rotates

An induction system gets its name from which property of the system? a) The way air in the room is circulated b) The type of units in each zone c) The type of air handling unit d) The air used in the central element of the system e) The volume of air conditioned

An inhibitor, when added to acid, will a) minimize the effect the acid has on the metal b) make the acid compatible with the sewer system for disposal c) strengthen the acid thereby shortening the cleaning procedure d) prevent the acid from attacking the boiler metal e) cause foaming in the boiler

An inhibitor, when added to acid, will: Choose one answer. a. Prevent or minimize the effect of the acid on the boiler metal b. Make the acid compatible with the sewer system for disposal c. Strengthen the acid, thereby shortening the cleaning procedure d. Neutralize the acid residue remaining on the boiler metal after a chemical cleaning e. Cause foaming in the boiler

An initial problem with the tubular boiler being used as a steam unit was a) metals which would not stand up to the temperatures involved b) dissolved impurities forming scale on the tube c) metals not standing up to the pressures involved d) inadequate capacities e) inability to maintain pressure

An inspector's test connection for a boiler pressure gauge: Choose one answer. a. Should be located upstream of a siphon b. Should be of 12.7 mm NPT size c. Is required on all boilers d. Shall be located adjacent to the boiler's pressure gauge e. Is mandatory by code on LP boilers only

An instrument transformer used to measure voltage is called a) current transformer b) step down transformer c) potential transformer d) step up transformer e) resistance indicator

An insulator is material that will not _electrical current. a) reduce b) retard c) resist d) slow e) conduct

An intermittent pilot a) lights the main flame then extinguishes b) must be manually ignited c) lights the main flame and remains on d) lights a pilot flame then extinguishes

An interrupted pilot of an automatic boiler a) burns continuously, like that in a home furnace b) lights before the main burner and goes out with it c) is one which has been extinguished by a flame scanner d) lights, completes a trial, and extinguishes after a main flame trial e) must be manually ignited

An interrupted pilot of an automatic boiler: Choose one answer. a. Burns continuously, like that in a home furnace b. Ignites before the main burner ignites, and is extinguished when the main burner is extinguished c. Is one that has been extinguished by an inadequate flame signal d. Ignites, is proven stable and extinguishes after the main flame is established e. Must be manually ignited

An oil used as thermal transfer fluid must not only be readily available, it must also be at a) low cost b) all costs c) cost d) reasonable cost e) low viscosity

An open circuit is one in which a) a switch is closed b) the current flows through the resistance c) the wires are bare d) a switch is open e) voltage may exit

An open loop control system requires a) a transducer and a recorder b) minimum deviation from set point c) a very small amount of dead time or lag d) constant attention e) two final control elements

An open loop control system requires: Choose one answer. a. A transducer and a recorder b. More accurate sensing devices c. A very small amount of dead time or lag d. Constant operator attention e. Two final control elements

An operating control switch for an ON-OFF boiler: Choose one answer. a. Uses a differential spring to reduce cycling b. Can only have its cut-in setting adjusted c. Has an un-adjustable span between cut-in and cut-out d. Utilizes a resistance coil e. Operates in conjunction with a Modutrol motor

An orifice plate with a round opening that is centred in the middle of the plate is called a: Choose one answer. a. Segmental orifice b. Concentric orifice c. Eccentric orifice d. Concentric flange e. Centralized flow

An outside screw and yoke valve: Choose one answer. a. Must be a gate valve b. Readily shows its operating position c. Is difficult to lubricate d. Requires no packing e. Has a non-rising stem

An upset in a plant process is called a/an: Choose one answer. a. Agitation b. Disruption c. Disturbance d. Error e. Malfunction

Any leakage occurring through the surfaces of a mechanical seal will a) not be visible to the operator b) result in an audible sound and be readily noticed c) be indicated by pump vibrations d) be axial to the shaft e) be radial to the shaft

Applying installation forces through the balls of a bearing can cause a) bearing misalignment b) false brinelling c) cracking or breaking of the balls d) improper lubrication e) brinelling

As a general rule the size of the condensate receiver should be large enough to hold a volume of condensate equal to the water evaporated by the boiler in a _____ period. Choose one answer. a. Two hour b. One and one half hour c. One hour d. 45 minute e. 20 to 30 minute

As the boiler pressure increases, the bourdon tube of the pressure gauge will a) tend to straighten b) compress more c) become less circular in cross-section d) become smaller in diameter e) tend to twist

Authority or Compensation Authority is the: Choose one answer. a. A process of automatically adjusting the set-point of a controller. b. Point in which the compensation effect is reversed in action. c. System element that senses a variable other than the controlled variable. d. Setting that indicates the effect a compensating sensor has on the main setpoint. e. Entity that awards compensation after a workplace injury

Automatic boiler programming controls a) must incorporate a modulating control system b) do not require interlocking devices c) require an ON-OFF or two-position control switch d) cannot make use of high-low fire control e) are not interconnected with the water level control system

Automatic snow melting systems do not use: Choose one answer. a. Hot water and antifreeze mixtures b. Electric resistance heating c. Infrared lamps mounted above sidewalks and ramps d. Hot water and ethylene glycol mixed e. Forced air heat

Automatic systems which can make decisions are termed a) annunciation systems b) indicating systems c) logic systems d) open loop systems e) go-go systems

Backward inclined airfoil fans a) are mostly used for low capacity, high pressure applications b) are mostly used for high capacity, low pressure applications c) are mostly used for high capacity, high pressure applications d) have a lower initial cost than the plain backward inclined fan e) are less efficient than the plain backward inclined fan

Bare tube evaporators are applied where the space temperature is maintained below a. 3C b. 2C c. 1C d. 0C e. -1C

Batteries a) do not pose any immediate electrical hazards b) produce a steady AC voltage c) produce a varying DC voltage d) produce a steady DC voltage e) produce a varying AC voltage

Because of the different circuit lengths to each convector, the direct return hot water system is difficult to: Choose one answer. a. Construct b. Maintain c. Return water to the boiler d. Balance e. Design

Because of variations in flow rate, nearly all large steam heating plants utilize: Choose one answer. a. Fully modulating burners b. A deaerator c. A condensate receiver d. Multiple boilers e. Steam pressure, regulating valves

Before a welder is allowed to weld on a boiler he must have a a) certificate of qualification b) certain minimum number of years experience c) performance qualification card d) welding test conducted e) certificate of qualification and a performance qualification card

Before charging a system which of the following needs to be done? a) Interlocks need to be tested b) Controls need to be set c) Required valves need to be opened d) All of the above

Before cleaning the waterside and as far as is possible a) a visual inspection of pressure parts should be completed b) all drum internals should be removed c) mud drum sludge should be completely removed d) a scale sample should be taken and an analysis done e) tubes should be "turbine"

Boiler blowoff piping has a specific size range, depending upon: Choose one answer. a. Water impurities b. The type of boiler c. Boiler capacity d. Operating pressure e. Blowoff line length

Boiler blowoff piping: Choose one answer. a. Can be reduced in size after the blowdown valves b. Must be full size to the point of discharge c. Must be at least 51 mm in size d. Can have valves of a smaller size than piping e. May discharge to the sewer system

Boiler fuel should be shut off immediately if it fails to ignite, in order to: Choose one answer. a. Save fuel b. Prevent furnace explosions c. Save money d. Save power e. Prevent fireside corrosion

Boiler furnaces are purged a) so that the programmer has time to verify permissiveness of interlocks b) in order to ensure combustion gases are fully removed prior to ignition c) while the operator is given the opportunity to check fuel and water systems d) so that combustibles are fully removed prior to ignition e) to cool any glowing refractory

Boiler modulating feed water control flow rate depends on a) level set point b) control valve position c) actual level d) feed water pressure e) set point, level, and valve position

Boiler modulating feedwater control flow rate depends on a) level set point b) control valve position c) actual level d) feedwater pressure e) set point, level, and valve position

Boiler stop valves shall be: Choose one answer. a. Always of the outside screw and yoke design b. Globe valves c. Identified with durable tags d. Installed on horizontal piping only e. Throttled during operation

Boiler water legs: Choose one answer. a. Increase the radiant heating surface b. Surround the furnace entirely c. Make water treatment less critical d. Support the boiler on concrete piers e. Make waterside maintenance easier

Brush gear for DC machines have brushes made from carbon because they: 1. are softer 2. wear to a smooth finish 3. are low cost 4. can produce large quantities of heat 5. have a low coefficient of friction a) 2, 3, 5 b) 1, 3, 4 c) 1, 2, 5 d) 3, 4, 5 e) 2, 4, 5

Building codes generally limit the highest pressure permissible in plumbing systems to: Choose one answer. a. 350 kPa b. 490 kPa c. 500 kPa d. 560 kPa e. 600 kPa

Building codes recommend that nowhere in a building plumbing system should the water pressure fall below: Choose one answer. a. 100 kPa b. 175 kPa c. 350 kPa d. 490 kPa e. 560 kPa

Buildings require heat sources to: Choose one answer. a. Offset the heat gain from the atmosphere b. Replace the ventilation air c. Reduce the humidity of the outside air d. Replace the exhaust air e. Offset the building's heat losses

Calculations of supply air duct leakage loss include: Choose one answer. a. 20% leakage loss when the supply air duct is outside the conditioned space b. Losses from bare supply air ducts within the conditioned space c. 10% leakage loss when the supply air duct is outside the conditioned space d. 5% leakage loss when the supply air duct is outside the conditioned space e. 10% leakage loss when some of the supply air duct is outside the conditioned space and some inside

Cascade control utilizes: Choose one answer. a. One controller, one transmitter and two valves. b. One controller, two transmitters and two valves c. Two controllers, one transmitter and two valves. d. Two controllers, two transmitters and two valves. e. Two controllers, two transmitters and one valve.

Cast-iron boiler capacity a) is very large compared to steel boilers b) can be increased by simply adding sections c) cannot be increased once assembly is completed d) is not a function of section numbers e) can be increased by increasing section size

Cast-iron boiler sections maximize heat transfer by a) utilizing as few passes as possible b) vertical firing c) exposing as large a surface as possible to the hot gases d) utilizing an external furnace e) using four push nipples per section

Centrifugal pump power requirements are decreased when a) discharge pressure is decreased b) the liters moved per minute is decreased c) the casing pressure drops d) the discharge velocity is high e) the discharge head is at minimum

Centrifugal pumps convert rotating mechanical energy into kinetic energy then a) discharge the kinetic energy b) back to mechanical energy c) absorb the energy d) into potential energy in the form of pressure e) into centrifugal force

Centrifugal pumps do not develop good suction lift because a) atmospheric pressure is usually too low b) the pumped medium relative density is too high c) their internal component clearances are too high d) the speed is too low e) they favor pressure rather than volume

Chain blocks are designed a) for mainly horizontal use b) with the top hook strongest c) with a very low mechanical advantage d) with the bottom hook strongest e) for lifting very long objects

Chalk or ______________ may be used to rub on the surface of rough castings as a marking material. a) aluminum sulphate b) grinding compound c) paint d) blue vitrol e) wax

Charging a refrigeration system a) is done with the expansion valve closed b) is done by adding refrigerant between the liquid shutoff valve and the expansion valve c) is done with the compressor shut down d) is done between the condenser and the receiver e) is done between the suction valve and the compressor

Clamp-on ammeter readings may be inaccurate if a) jaws are dirty or misaligned b) circuit voltage is too high c) circuit resistance is too low d) circuit power is too high e) conductor insulation is too thick

Classifications of air conditioning ducts include a) low pressure and medium pressure b) low pressure, medium pressure, and high pressure c) medium pressure and high pressure d) absorption and compression e) heating and cooling

Compared to a cross flow tower, a counter flow tower a) is not as tall b) has much less capacity c) requires less floor space d) requires more fan power e) has a higher pressure drop

Compatibility of oils is determined by a) analysis b) reading the labels c) electrolysis d) diagnosis e) smelling a sample

Compressed air machinery would most likely be used in a) coal mines b) residential garages c) home furnace control systems d) agricultural applications e) tool and die shops

Compressed air tools tend to be a) heavier than equivalent electrical tools b) damaged by overloading c) hot after prolonged operation d) more expensive than electrical tools e) less compact than electrical tools

Compression ignition engines a) need suction end discharge valves b) will compress air only on the compression stroke c) need a carburetor to mix the fuel with the air d) will compress air only on the power stroke e) require a spark timing device

Compression type packing: a)1. prevents air from entering the pump b)2. reduces the maintenance cost on pumps c)3. protects the shaft from scoring and corrosion d)4. is used with all mechanical seals e) 1&2

Compressor unloaders a) could close the discharge valve b) must be used on centrifugal compressors c) could keep the suction valve open d) activate the stop and start button e) are located on the driver of the compressor

Computer "Run Time Totals" are commonly used a) in graphic displays b) for inventory control c) for logic supervisory systems d) for maintenance management e) with a MODEM

Computer "soft keying" is a) done only with lap top units b) done to make the computer quicker and easier to use c) a method of pressing a key twice before a result is obtained d) the same as using a mouse or joystick e) a system used to tint graphics

Concentration of the Lithium Bromide can be most easily controlled by which of the following means? a) Controlling the volume of water sprayed into the absorber. b) Controlling the temperature in the cooling tower. c) Controlling the amount of weak Lithium Bromide pumped into the generator. d) Controlling the pressure in the vacuum between the evaporator and the absorber. e) Controlling the temperature in the generator.

Condensing turbines a) are always impulse turbines b) will have a vacuum in the last row of rotating blades c) will use the condensate for heating d) are very small units e) cannot have counter-flow stages

Conduction heat gains are calculated on the assumption that a) solar heat varies from hour to hour as sun changes position b) solar heat gains are not included c) construction details are unimportant d) the "u" value is not used e) solar heat gains are included

Consider a single stage, single acting reciprocating compressor. Calculate the piston displacement in cubic meters per minute, if given the following: piston stroke 12 cm piston diameter 10 cm piston speed 1100 working strokes per minute a. 1.031 b. 1.033 c. 1.035 d. 1.037 e. 1.039

Control motors are divided into two classifications: Choose one answer. a. High-torque and low-torque b. AC and DC c. Valve operators and damper operators d. High voltage and low voltage e. Pump and fan controllers

Control of the static pressure and horsepower requirements at a given speed is obtained by using a) direct drives b) fluid drives c) outlet damper control d) variable inlet vane control e) belt guards

Convection type hot oil heaters have an approximate efficiency of: Choose one answer. a. 25 - 35% b. 90 - 95% c. 85 - 95% d. 70 - 80% e. 75 - 85%

Convectors use ________ to increase heat transfer. a) metal fins b) radiators c) blowers d) copper tubes e) brass tubes

Copper losses in a transformer are reduced by a) using fan cooling b) using oil cooling c) using larger diameter wire d) reducing the primary voltage e) increasing the secondary voltage

Copper sulphate may be used a) as a thread cutting fluid b) for lubricating very fine threads such as those in a micrometer c) for coating tools in order to prevent rusting d) to free nuts which are corroded to bolts e) as a marking material

Corrugations in outside aluminum storm piping are required to: Choose one answer. a. Increase the flow of storm water b. Decrease potential for blockage c. Eliminate corrosion d. Allow water to flow if there is scale build up e. Permit expansion of the aluminum

Cracks in the refractory of a hot oil heater may indicate that a) a poor quality of refractory has been used b) there may have been hot spots at this point c) the burners have been operating at too high a temperature d) there is nothing to be concerned about e) the tubes are leaking

Current flow direction and intensity will a) affect magnetic field direction and intensity b) affect the voltage c) affect the resistance of a circuit d) not affect electromagnetic field direction e) not affect electromagnetic field intensity

Current flow is a) proportional to the applied voltage b) proportional to the resistance c) reversed by a resistance d) increased by a decrease in applied voltage e) inversely proportional to the applied voltage

Current flow is inversely proportional to the a) voltage b) amperage c) resistance d) wattage e) conductance

Current transformers step down the current rather than the a) resistance b) flux strength c) conductance d) number of poles e) voltage

Cylinder scavenging a) is more efficient in a 2 cycle engine than a 4 cycle type b) is scoring the cylinder by a broken piston ring c) is the removal of exhaust gases from the cylinder d) prevents the air from entering the cylinder e) removes excessive oil from the cylinder walls

Damper designs include a) only parallel blade types b) only single blade types c) opposed blade, parallel blade, and single blade types d) only opposed blade types e) none of the above

Dampers in air handling systems a) may only be manual and modulating b) may only be modulating c) may be modulating, manual, or two position d) may only be manual and two position e) may only be two position

Data cannot be permanently stored on a Choose one answer. a. CD-ROM b. Hard disk c. CPU d. Monitor e. DVD-ROM

De-humidification is achieved by a) absorbing the moisture with a sponge filter b) absorbing moisture with a chemical drying agent c) cooling the air to a corresponding dew point temperature d) heating air to a corresponding wet bulb temperature e) saturating the air until the precipitation point at room temperature is reached

De-humidification occurs in an Air washer when which of the following occurs? a) If the level in the bottom tank drops lower than the minimum level b) If water temperature is heated above the dry bulb temperature c) If spray water is cooled to a temperature below the dew point d) Heating of the spray water e) None of the above

Defective condenser operation is a result of the presence of all of the following except a) scale forming chemicals b) dirty cooling water c) non-condensible gases d) low coolant circulation e) compressor lubricating oil

Diverter fittings are used in the supply lines to heating units when: Choose one answer. a. Compensating for a low heating load b. A higher heating output is required from the heating unit c. The distance from boiler to heating unit is short d. There are no balancing valves installed in the supply line e. They cannot be easily installed in the return lines.

Double serpentine water coil circuiting is used a) where the water velocity in the tubes is less than 0.3 m/s b) where the water velocity in the tubes is more than 2.4 m/s c) for any water velocity in the tubes d) where the water velocity in the tubes is between 0.3 and 2.4 m/s e) in applications requiring low water velocities and low water pressure drops

Double-wound transformers can be connected as? a) current transformer b) core type transformer c) potential transformer d) shell type transformer e) Autotransformer

During sensible cooling a) relative humidity decreases b) enthalpy increases c) wet-bulb temperature increases d) relative humidity increases e) dewpoint temperature increases

During sensible heating which of the following results is true? a) dry-bulb temperature lowers b) wet-bulb temperature remains constant c) relative humidity increases d) enthalpy remains constant e) none of the above

During sensible heating, only a) the relative humidity remains unchanged b) the relative humidity increases c) the dewpoint temperature increases d) the specific volume increases e) the relative humidity decreases

During sensible heating, only the _________________ decreases. Choose one answer. a. Relative humidity b. Specific humidity c. Dew point temperature d. Specific volume e. Wet bulb temperature

During shutdown, oil heater pilots and main burners are checked for a) setting b) temperature c) pressure d) cleanliness e) flame pattern

During start-up of a boiler equipped with an automatic control system and a flame scanning device, the main burner shutoff valve: Choose one answer. a. Must be opened before the pilot will ignite b. Can be opened before the scanner sees a flame c. Should be open during the full start sequence d. Should open as soon as the pilot valve opens e. Must be closed before pilot ignition

During the start-up of a boiler equipped with an automatic control system and flame scanning device, the main burner safety shut-off valve: Choose one answer. a. Must be opened before the ignition transformer energizes b. Can be opened before the flame scanner sees a flame c. Can be opened any time during the start-up sequence d. Should be opened as soon as the pilot valve opens e. Must be closed before pilot ignition

During the summer, the majority of people feel comfortable when the effective temperature is between a) 17.2 and 21.7 degrees C b) 16 and 19.5 degrees C c) 15 and 19 degrees C d) 21 and 25 degrees C e) 19 and 24 degrees C

During the summer, the majority of people feel comfortable when the effective temperature is approximately between: Choose one answer. a. 15 and 19°C b. 21 and 24°C c. 19 and 24°C d. 17 and 22°C e. 16 and 20°C

During the warm up period of a heating boiler, the main burner goes out. The operator should: Choose one answer. a. Shut down the boiler immediately purge the boiler and restart it b. Shut down the boiler, close the fuel valves and determine the cause of the problem c. Try to re-light the burner immediately d. Check the altitude gage to ensure there is enough water in the system e. Clean the burner, purge the boiler and restart it

During the winter, the majority of people feel comfortable when the effective temperature is between a) 15 and 19 degrees C b) 20.5 and 24 degrees C c) 19 and 24 degrees C d) 17.2 and 21.7 degrees C e) 16 and 19.5 degrees C

During the winter, the majority of people feel comfortable when the effective temperature is approximately between: Choose one answer. a. 15 and 19°C b. 21 and 24°C c. 19 and 24°C d. 17 and 22°C e. 16 and 20°C

During warm-up of a cold hot water boiler excessive pressure build-up is prevented by a) a very slow warm-up b) an expansion tank c) a pressure relief valve d) opening the boiler outlet valve e) venting the system

Early gas turbines were handicapped by a) metal not being able to withstand high speed centrifugal forces b) the inability to get enough air into the combustion chamber c) metals not standing the high temperatures involved d) their high operating speeds e) their inadequate power capability

Electrical heating can be divided into two general groups: Choose one answer. a. Radiant and convective b. Direct and indirect c. AC and DC d. Radiant panel and infrared e. Ultraviolet and infrared

Electrical starters and contractors should be inspected Choose one answer. a. Daily b. Weekly c. Monthly d. Semi-annually e. Annually

Electromotive force a) is capable of moving a quantity of electrons at some rate per period of time b) is able to move ohms through a resistance c) is increased by a resistor d) is increased by a voltage drop e) induces resistance to an open circuit

Electronic air cleaners are divided into ____________ air cleaners. Choose one answer. a. Commercial and residential b. impingement and non-impingement c. High voltage and low voltage d. Electrostatic precipitators and charged media e. AC and DC

Electronic controllers can be divided into two types a) on or off b) modulating and direct acting c) indirect and direct acting d) on or off and modulating e) actuators and relays

Electronic filters will remove: Choose one answer. a. All particles from the air b. Fine particles from the air c. Odours d. Smoke e. Carbon monoxide

Electrons are negatively charged particles a) flowing through the atoms center b) orbiting about the nucleus of an atom c) firmly attached to the neutrons of an atom d) which can easily flow through insulators e) which seek open circuits

Electrostatic filters are highly efficient in the removal of: Choose one answer. a. Odours b. Fine dust, smoke, and fumes c. Bacteria and spores d. Lint e. Mists and fogs

Emergency discharge is used to counter which of the following problems? a) Dangerously low system pressures b) Toxic refrigerant leaks c) Combustion of flammable refrigerants d) Dangerously high system pressures e) All of the above

Enthalpy of air depends on a) the pressure, temperature, and relative humidity of the air b) the relative humidity of the air only c) the pressure and temperature of the air only d) the air velocity e) the temperature of the air only

Ethylene glycol used in glycol coils a) has a higher heat transfer efficiency than hot water b) has less friction losses in the coil and piping than hot water c) requires a smaller pump and less horsepower than hot water d) has much lower pressure drops through the coil and piping e) has a lower heat transfer efficiency than hot water

Evaporative cooling is a) heating and humidification of the air b) heating and dehumidification of the air c) cooling and humidification of the air d) cooling and dehumidification of the air e) cooling of the air only

Excessive pressure build-up due to a rise in temperature and the resulting expansion of the water in the system is prevented by the use of a) a float tank b) a relief valve c) an expansion tank d) a cushion valve e) a safety valve

Excessive wind velocity in a natural draft cooling tower may cause a) louvers to become broken b) high water drift or losses c) rotation reversal of the fan d) over-cooling of the water e) under-cooling of the water

Extended type tubes used with oil heaters are tubes a) which have been expanded b) which have extensions attached c) with fins on their outer surfaces d) of varying lengths e) that reach beyond the top drum

Eye bolts should be a) threaded with fine threads only b) shackled when more than two are used c) angled so the load is applied non-axially d) hot forged e) self tapping

Finned convectors should be kept free of: Choose one answer. a. Air b. Steam c. Corrosion d. Dust e. Scale

Finned tube coils in air handling systems are often called a) fish coils b) bare tube coils c) extended surface coils d) cooling coils e) heating coils

Firetubes are cleaned annually to remove _______ deposits. Choose one answer. a. Refractory b. Oil c. Soot d. Chemical e. Biological

Flame rods: Choose one answer. a. Should be cleaned of carbon deposits monthly. b. Generate a voltage, which is then used to monitor flames. c. Should shut off the fuel within four seconds of flame failure. d. Are unreliable and unsafe. e. Should not be exposed to temperatures above 100°C

Flange faces used in hot oil system construction should be: Choose one answer. a. Grooved and recessed b. Smooth and raised c. Grooved and raised d. Tongue and groove e. Threaded

Flat-finned surface type coils are normally used for a) steam heating purposes b) water heating purposes c) high temperature application d) low temperature application where ice may form e) greater turbulence of air at the fin surface

Flexible couplings will compensate for a) overheating of packing b) axial shaft misalignment c) bearing failure d) shaft eccentricity due to a badly bent shaft e) impeller imbalance

Fluid film lubrication a) is always used with a high viscosity oil b) is also called flood lubrication c) is always used with a grease lubricant d) is different from flood lubrication e) does not separate the metal surfaces

Fluid film lubrication a) is used for heavy loads b) removes all friction in the bearing c) is used on all anti-friction bearings d) is used only during low ambient temperature conditions e) is used for light loads

Flutes are found on a) the inside edges of thread dies b) the body of a twist drill bit c) the point of a twist drill bit d) thread taps e) scribers

For a Helical Rotor Design rotary compressor which of the following statements is true? a) The compressor consists of 3 opposing grooved rotors. b) The driving rotor has less helical lobes than the driven rotor has flute. c) The vapour is drawn in via the closed space between the driving rotor and the casing. d) The cylinders around the rotor screws must be considerably larger in diameter than the screws. e) All of the above

For a direct expansion system which of the following statements is true? a) The evaporator in this system is never in direct contact with the material or space being refrigerated. b) For large systems calcium chloride brine is cooled by the evaporator then pumped to the area being refrigerated. c) Water cooled by the chiller evaporation coils is used to refrigerate at temperatures below 0 degrees C. d) The evaporator can be located in air circulating ducts communicating with the material or space being refrigerated. e) Water cooled by the chiller evaporation coils is used to refrigerate at temperatures equal to 0 degrees C

For a glycol preheat system, using hot water as its heat source, which of the following statements is false? Choose one answer. a. The glycol in the system prevents the heat exchanger from freezing if the hot water circulating pump fails. b. Flanges or unions and manual shutoff valves must be provided to facilitate removal of the heat exchanger coil c. The temperature controller opens the hot water supply valve when the temperature outside drops to 10°C d. A hot water flow switch prevents the glycol pump from starting until the hot water supply valve is established e. Hot water temperature should not exceed 100°C

For a glycol system using hot water as its heat source which of the following statements is false? a) Valve V-3 will be opened to feed a constant flow of hot water to the converter. b) Hot water temperature should not exceed 100 degrees C. c) Temperature controller TC-1 opens V-3 when the temperature outside drops to 10 degrees C. d) Flow Switch FS automatically starts the glycol pump automatically after V-3 is opened. e) Provide flanges or unions and manual shutoff valves to facilitate coil removal

For which HVAC system is the central fan usually provided with variable inlet vanes, so that the air supply duct pressure can be maintained at a setpoint? Choose one answer. a. Variable air volume system b. Hydronic heat pump system c. Dual duct system d. Fan coil unit with make-up air system e. Constant air volume system

Forced warm air heating systems, as compared to steam or hot water heating systems, are used more extensively to heat residences, small commercial buildings, shops, and stores since: Choose one answer. a. They are very portable b. There is no maintenance required c. They do not require duct work d. Installation and maintenance costs are lower e. They are very quiet in operation

Forward curved centrifugal fans a) operate at a lower speed than backward inclined fans for the same air volume b) operate at a higher speed than backward inclined fans for the same air volume c) require less horsepower than backward inclined fans to deliver a specified air volume d) are more efficient than backward inclined fans e) are quieter than backward inclined fans

Forward curved fans a) require larger size shafts than backward inclined fans b) are desirable when air handling units have two or more fans mounted on a common shaft c) operate at higher speeds than backward inclined fans d) are quieter than backward inclined fans e) are more desirable for large fans

Four cycle engine lubrication is usually a) forced by pump b) by gravity oilers c) by the scoop method d) by the dip tube method e) by grease fitting

Four-stroke cycle engine valves are a) operated by cams b) of the pressure differential variety c) a number of ports in the cylinder wall d) often termed reed or channel valves e) always open as the piston travels upwards

Freezing problems in steam coils with long tube lengths, handling a large amount of low temperature outside air a) are minimized by using preheat coils controlled by an outdoor temperature controller b) are minimized by using modulating control valves to control the steam heating coil output c) are best minimized by using a two-position control valve to control coil output d) are minimized by using an over sized coil e) are minimized by using an over sized control valve

Freon 22 refrigerant a) is not miscible with oil b) is mostly used in packing plants c) is corrosive on copper d) is corrosive on aluminum e) is a heat transferring medium

Frost formation on the suction line indicates what? a) Moisture in the system b) "Copper-Plating" on the bearings and compressor exhaust valve c) Overcharging the system d) Thermostat controlled solenoid deterioration e) Inadequate levels of refrigerant in the system

Gas turbines are ideal when considering a) long warm-up periods b) emergency power generation c) automotive power d) cooling water pump operation e) good thermal efficiency

Grease is not a suitable lubricant a) if the atmosphere contains a lot of moisture b) when the atmosphere is dusty c) if corrosion protection is desired during downtime d) in the food industry e) if a large amount of cooling is desired

HVAC control systems maintain minimum _______ air during periods of extreme high and low ambient temperature. Choose one answer. a. Return b. Supply c. Ventilation d. Exhaust e. Recycled

Half serpentine water coil circuiting is used a) in applications requiring high water velocities and low water pressure drops b) where the water velocity in the tubes is more than 2.4 m/s c) where the water velocity in the tubes is between 0.3 and 2.4 m/s d) for any water velocity in the tubes e) where the water velocity in the tubes is less than 0.3 m/s

Hand operated pet cocks for expelling air from heating systems have been superseded by: Choose one answer. a. Steam traps b. Diverters c. Automatic air vents d. Check valves e. Pipe siphons

Hand taps are usually made in sets of three called a) SAE, ISO, and metric b) warding, mill, and bastard c) rough, coarse, and fine d) plug, taper, and bottoming e) primary, secondary, and finishing

Heating plants with multiple boilers often have: Choose one answer. a. Independent boiler feed water controls b. Individual feed water systems c. Problems controlling water level d. Separate condensate receivers e. A common feedwater control valve

High capacity steam turbine oils should a) have a low specific heat b) have a very high viscosity c) be fire resistant d) have a low pour point e) mix well with water

High efficiency furnaces and heaters range in annual fuel utilization efficiency (AFUE) from: Choose one answer. a. 94 - 98% b. 80 - 98% c. 70 - 75% d. 60 - 70% e. 50 - 60%

High viscosity oils are normally used for the following applications: a) low speed, high load b) low speed, low pressure c) high speed, high load d) high speed, low temperature e) high temperature, low load

Higher gearing is commonly used on a) rotary lobe units b) screw units c) sliding vane units d) reciprocating units e) centrifugal units

Hot water heating boilers must be equipped with a a) thermometer b) fusible plug c) return trap d) blow down tank e) steam pressure gage

SMIB

I WILL STRIVE TO LIVE WITH LOVE & CARE UPON THE LEVEL BY THE SQUARE

If exhaust fans are used over cooking only a) 10% of the heat gain is used in calculations b) 25% of the heat gain is used in calculations c) 50% of the heat gain is used in calculations d) 60% of the heat gain is used in calculations e) 75% of the heat gain is used in calculations

If the number of secondary turns is greater than the number of primary turns in a transformer. This transformer is called? a) current transformer b) step down transformer c) potential transformer d) step up transformer e) resistance indicator

If the packing gland of a centrifugal water pump is leaking too much, you should a) tighten up the gland until all leakage has been stopped b) tighten up the gland but permit a slight amount of leakage c) tighten up the gland as far as is possible d) throttle the suction valve a little e) tighten up the gland until there is 10% leakage

If the pilot flame is adequate but the main burner fails to ignite, the programmer must: Choose one answer. a. Hold the program in its present state b. Recycle the start-up sequence c. Proceed to post purge and lockout while sounding an alarm. d. Go directly to a lockout condition e. Sound an alarm

If the power dissipated by a resistor is 1.2 kW when supplied with 110 volts, the amperage will be a) 91.666 amperes b) 1320 amperes c) 19.006 amperes d) 10.909 amperes e) 132 amperes

If the water level falls too low during operation of a steam heating boiler the operator should a) tell his or her supervisor b) add more water immediately c) operate the safety valve d) shut the boiler down e) lower the flame and add water to bring it up to a safe level

If two unlike poles are placed adjacent to each other there is a) a force of repulsion between the magnets b) a development of iron filings between the magnets c) a reversal of the north and south poles of each magnet d) a force of attraction between the magnets e) a production of AC power

If you desire an oil to flow at a much lower temperature you would most likely add a) a viscosity index improver b) pour point depressants c) a dispersant d) a thickening agent e) low viscosity oil

If your low pressure steam boiler was in service and you found that there was no water level showing in the gauge glass, your first action would be to: Choose one answer. a. Lift the safety valve try lever b. Cut off the fuel and air to the furnace c. Start the standby feed pump d. Send for the Boiler Inspector e. Call a reliable plumber

Ignition in a diesel engine is started by a) a glow plug b) a spark plug c) a starter motor d) compression in the cylinder e) air injection

Improper location of the expansion tank in relation to the circulating pump can cause: Choose one answer. a. Pumping inefficiencies b. De-pressurization of the expansion tank c. The pump motor to be overloaded d. Over-pressurization of the expansion tank e. Vapour bubbles to form in the circulating pump

In a Fluid catalytic cracker; Choose one answer. a. Light gas oils are contacted with a hot catalyst in a reformer b. Light gas oils are contacted with a hot catalyst in a reactor c. Heavy gas oils are contacted with a hot catalyst in a reformer d. Heavy gas oils are contacted with a hot catalyst in a reactor e. Naphtha is the main input

In a absorption refrigeration system, which one is NOT a possible cause for crystallization following start-up in the system? a. Noncondensables in machine b. Condenser cooling water too cold c. Faulty purging d. Cooling water too warm

In a absorption refrigeration system, which one is NOT a possible cause for decreased capacity in the system? a. Noncondensables in machine b. Purging ineffective c. Dilution cycle is to short d. Lithium brodmide requires octyl alcohol e. Cooling water too warm

In a basic electric control system an example of a controlled device is a) a fuel valve b) a louver c) a diverter valve d) an electric switch e) all of the above

In a basic electric control system an example of a controlled device is a: Choose one answer. a. fuel valve b. thermostat c. pressure-stat d. humidistat e. flow switch

In a basic electrical control system the device that senses a drop in air temperature is called the: Choose one answer. a. Final controlled device b. Pneumatic temperature sensor c. Humidistat d. Thermostat e. Regulator

In a cast iron modular heating boiler, the operation of the burner of each module is controlled by a __________ which starts or stops modules in sequence as load demand increases or decreases. a) temperature sensor b) step controller c) thermostat d) temperature transmitter e) flow controller

In a central air conditioning system, supplementary units are located in each zone to provide additional: Choose one answer. a. Ventilation b. Humidity Control c. Air circulation d. Heating e. Filtering

In a centrifugal compressor the kinetic energy is converted to potential energy in the a) volute, diffuser, or both b) intercooler c) diffuser only d) compressor cavity e) volute only

In a circulating hot water system automatic air vents serve which of the following functions? a) They cool the water in the storage tank to increase the temperature differential to increase circulation. b) They remove air that is released when water is heated. c) They supply air to cooling water in the storage tank. d) They are required for adequate water aeration. e) None of the above

In a circulating hot water system the municipal distribution systems and/or local storage tanks are used for which of the following reasons. a) Cold water supply only b) Water supply to heaters only c) Hot water supply from municipal heating stations d) Both cold water and heater water supply e) Water meter rationing

In a closed expansion tank system an air separator: Choose one answer. a. Removes air from the system b. Is installed at the boiler inlet c. Is installed at the boiler outlet d. Directs air into the expansion tank e. Removes air from the expansion tank

In a closed tank that is partially filled with a salt solution at a temperature well below the boiling point of the solution: Choose one answer. a. Some molecules of water vapour will actually escape from the solution b. There will be a steady stream of water vapour molecules leaving and entering the solution c. No molecules of water vapour will be able escape from the solution d. No molecules of water vapour will be absorbed back into the solution e. Some molecules of water vapour will actually be absorbed back into the solution

In a closed tank the salt solution is said to be in equilibrium Choose one answer. a. when the ratio of water and salt does not change b. just before crystallization occurs c. when the solution is saturated d. when the salt precipitates e. when the ratio of water in the solution increases

In a closed vessel, the boiling point of a liquid can be raised by: Choose one answer. a. Raising the liquid level in the vessel b. Lowering the pressure in the vessel c. Raising the pressure in the vessel d. Lowering the liquid level in the vessel e. Raising the temperature in the vessel

In a compression ignition engine the fuel is ignited by a) an electric spark b) the compressed air temperature c) the atomized fuel d) a cross-combustor e) compressed air pressure

In a constant air volume system with perimeter heating which of the following elements are fluids in the air handling unit? i) Heating coils ii) Cooling coils iii) An air mixing section iv) Filters v) A humidifier vi) A dehumidifier a) i, ii, iii, and iv b) i, ii, v, and vi c) ii, iii, iv, and v d) i, iii, and v e) iii only

In a dc circuit, self-inductance is __ when voltage is at maximum, while in a ac circuit self inductance is __ a. Not a factor, continually a factor b. Sometimes a factor, not a factor c. Continually a factor, not a factor d. Not a factor, sometimes a factor

In a fin-coil heat exchanger the primary source of heat for the exchanger is a) steam or hot water b) gas c) oil d) solar e) radiant

In a fin-coil heat exchanger, the heat exchanger is Choose one answer. a. a steam or hot water coil b. Gas-fired c. Oil-fired d. Electric e. Direct-fired

In a float type low water fuel cutoff, the main purpose of the mercury switch is to: Choose one answer. a. Open the burner circuit when the level is high b. Close the burner circuit when the level is low c. Activate a low water alarm d. Open the burner circuit when the level is low e. Close the burner circuit when the level is high

In a forced circulation system, the closed expansion tank allows the system to operate: Choose one answer. a. At a vacuum b. At well above atmospheric pressure c. At pressures above sea level d. Effectively at the lower floors e. At atmospheric pressure

In a forced lubrication system, a pump supplies oil _________________ for the bearings. a) by gravity b) to an oil sump c) to a drip feeder d) to a wetted wick e) under pressure

In a glass stem thermometer the space above the liquid is usually: Choose one answer. a. Filled with Nitrogen b. Filled with Argon c. Under a vacuum d. Open to atmosphere e. filled with alcohol

In a gravity return system, the boiler should be placed: Choose one answer. a. Well above the highest radiator b. Well below the lowest radiator c. On an elevated platform d. At the same level as the radiators e. In a central location

In a high efficiency furnace or heater the temperature of the flue gases are _____ in the secondary heat exchanger. Choose one answer. a. Very high b. Very low c. Above the dew point d. Below the dew point e. At the dew point

In a hot water coil which of the following is not included for providing a good guideline for the correct application of the system with minimal possibility of freeze-up? a) Positive air venting of the coil is essential b) The air velocity should exceed 10 m/s c) A constant flow of water should be fed to the coil d) The water velocity should exceed 0.8 m/s e) The water temperature should be maintained at a reasonable preset temperature

In a lithium bromide refrigeration system, the _____ lithium bromide solution has the ability to absorb water vapour readily. Choose one answer. a. Hot b. Cold c. White d. Weak e. Strong

In a low pressure serpentine tube water tube boiler, the serpentine tubes are attached to upper and lower headers with__________ connections. a) welded b) pressure sealed c) threaded d) seamless e) nozzle

In a meat processing plant hot water for knife sanitization is maintained at a temperature of approximately: Choose one answer. a. 10°C b. 50°C c. 70°C d. 105°C e. 121°C

In a mechanical air intake, natural exhaust ventilation system, the pressure in the building is: Choose one answer. a. Well below atmospheric pressure b. Slightly below atmospheric pressure c. At atmospheric pressure d. Slightly above atmospheric pressure e. Well above atmospheric pressure

In a multi-zone system, _________ valves prevent continuous circulation of hot water after the zone control has stopped the circulator pump. Choose one answer. a. Isolation b. By-pass c. Air separator d. Balance e. Flow control

In a non-bleed type controller the device that senses a change in room temperature is called a a) sensing valve b) bellows c) set point gage d) temperature switch e) feedback switch

In a one pipe hot water system, the fitting that directs the water to each converter is called the: Choose one answer. a. Diverter b. Balancing valve c. Vent valve d. Separator e. Syphon

In a pneumatic control system, the nozzle receives a regulated air supply pressure of approximately: Choose one answer. a. 140 psi b. 20 kPa c. 140 kPa d. 210 kPa e. 30 kPa

In a pulse combination furnace, the stated efficiency is: Choose one answer. a. 94 - 98% b. 80 - 95% c. 70 - 75% d. 60 - 70% e. 50 - 60%

In a radiant heating system the maximum surface temperature is a) 10 degrees C b) 20 degrees C c) 30 degrees C d) 40 degrees C e) 50 degrees C

In a refrigeration system, the liquid refrigerant is changed to a gas in the: Choose one answer. a. Condenser b. Charging drum c. Receiver d. Compressor e. Evaporator

In a refrigeration system, the purpose of the compressor is to a) establish two pressure levels b) reject the heat from the system c) absorb the heat into the system d) regulate the flow of the refrigerant e) heat the refrigerant

In a refrigeration system, which of the following is NOT a cause of poor condenser performance? Choose one answer. a. Waterside scale accumulation b. Oil film accumulation on the inside of the condenser c. Accumulations of non-condensable gases in the condenser d. Inadequate coolant circulation e. Inadequate refrigerant charge

In a rotating vane design rotary compressor, a good seal is maintained between the vanes and the cylinder by a) centrifugal force b) the oil c) high pressure refrigerant vapour d) low pressure suction e) the eccentric rotor size

In a self-contained control system the energy for operation is provided by a) electricity b) air pressure c) the reaction of the sensing device d) a bellows e) a bleed type nozzle

In a series wound DC generator a) brushes do not change AC to DC b) there are no field poles c) load current passes through the field winding's d) the shunt winding taps in after the series winding e) the shunt winding taps in before the series winding

In a sliding vane design refrigeration compressor, a good seal is maintained between the vanes and the cylinder by: Choose one answer. a. Centrifugal force b. Lube oil c. High pressure refrigerant vapour d. Liquid refrigerant carryover e. The eccentric rotor size

In a system controlled by a high pressure float valve insufficient liquid will cause which of the following results? a) automatic system shut down b) boosting the compressors pressure c) liquid being carried over to the compressor with the vapour d) starving the evaporator and reducing the capacity of the system e) all of the above

In a two element feed water control the following items are measured: a) boiler water level and steam flow b) feed water flow and steam flow c) boiler water level and feed water flow d) boiler water level and fuel flow e) temperature and volume of feed water

In a two element feedwater control the following items are measured: a) boiler water level and steam flow b) feedwater flow and steam flow c) boiler water level and feedwater flow d) boiler water level and fuel flow e) temperature and volume of feedwater

In a vertical sectional boiler, the sections are placed: Choose one answer. a. One above the other b. Side by side c. On the furnace d. Above the draft hood e. 180° to each other

In a warm air heating system, the cold air return registers are located: Choose one answer. a. In exterior walls b. In interior locations c. Under windows d. In floors e. In ceilings

In a warm air heating system, the heated air should enter the rooms preferably via the a) high wall registers on the inside wall b) baseboard registers on the inside wall c) baseboard registers on the outside wall d) high wall registers on the outside wall e) unit heaters on the outside wall

In actual systems there will be a gradual pressure drop through each side of the system due to a) the economizer b) friction in the evaporator, condenser, and piping c) decomposition of refrigerants d) coefficients of expansion of system components e) super heating effects

In all systems, the horizontal steam supply pipes between boiler and heating units are called the: Choose one answer. a. Mains b. Risers c. Banks d. Branches e. Downcomers

In an Ammonia Absorption System what is used as the absorbent? a) Ammonia b) Air c) Lithium Bromide d) Water e) Freon

In an HVAC air-handling unit, temperature control that uses face and bypass dampers: Choose one answer. a. Closes the bypass damper and opens the face damper to direct air through the coil b. Closes both the bypass damper and the face damper to direct air through the coil c. Opens the bypass damper and closes the face damper to direct air across the coil d. Increases air flow through the bypass to increase air temperature e. Modulates the hot and cold deck airflows to maintain a constant supply air temperature

In an HVAC system, a differential pressure controller maintains supply air duct static pressure constant by Choose one answer. a. modulating the position of the relief air damper b. decreasing air temperature c. modulating the damper on the suction side of the fan d. modulating the damper on the discharge side of the fan e. increasing air temperature

In an HVAC system, which of the following is not a function of terminal air distribution devices? Choose one answer. a. Distribute the conditioned air to the occupied spaces b. Provide uniform space temperatures c. Control or counteract the effects of conduction, convection and radiation d. Provide adequate air motion e. Promote stratification of conditioned air and room air

In an absorption refrigeration system, the compressor used in a compression refrigeration system is eliminated. Instead, the compressor's functions are performed by the: Choose one answer. a. condenser, expansion valve, and the receiver b. evaporator, absorber and generator c. generator pump, evaporator pump, and the absorber pump d. absorber, generator, and the generator pump e. evaporator, absorber, and the generator

In an ammonia absorption refrigeration system, the _____ ammonia is absorbed by the _____ aqua. Choose one answer. a. Vaporized, weak b. Vaporized, strong c. Liquid, strong d. Liquid, weak e. Fluid, hot

In an area flow meter, the flow is measured at: Choose one answer. a. The bottom of the float b. The top of the float c. The edge of the float head d. The outlet connection e. Mid range of the float travel

In an atom the electrons a) orbit around each other b) are repelled by the neutrons c) are attracted to the protons d) are large in size when compared to the protons e) orbit only the neutrons

In an automatic control system, the controller output signal changes the position of the: Choose one answer. a. Recorder b. Transmitter c. Sensing element d. Control valve e. Indicator dial

In an electric snow melting unit, a thermostat should be used to automatically shut the system down when the outdoor temperature is above a) 0 degrees C b) 1 degrees C c) 2 degrees C d) 3 degrees C

In an equivalent circuit developed from a multi-resistor series circuit a) the resistance will be the reciprocal sum of the original resistances b) voltage drop will be the same as for each of the original resistances c) the sum of voltage drops across the original resistances will be equal to the voltage drop of the equivalent circuit d) original circuit resistances will each have to be the same as the equivalent resistance e) amperage flowing will be different than the original circuit amperage flowing through each resistance

In an impulse turbine a) the steam flow is reduced through the nozzles b) the steam pressure is reduced in the nozzles c) the steam pressure will drop across the blades d) the steam velocity is increased through the blades e) the exhaust steam is directed

In an internally fired, gas-fired infrared heater, the surface temperature is about: Choose one answer. a. 300°C b. 400°C c. 500°C d. 600°C e. 700°C

In an oil refinery, it is important to: Choose one answer. a. Maximize production of the high demand products such as gasoline b. Maximize production of the high demand products such as asphalt c. Ensure that each refinery is nearly identical to others d. Generate enough electricity so the entire plant is self-sufficient e. Regulate production quantities to achieve the highest market value for the final product

In an open wire type, heating element, the resistance wire is made of: Choose one answer. a. Tungsten b. Magnesium oxide c. Mica d. Steel e. Nickel-chromium

In extremely cold climates, it may be necessary to _________________________ in an HVAC system. Choose one answer. a. Increase the temperature controller's throttling range b. Close the outdoor air dampers c. Install two separate pre-heater coils d. Heat the dampers e. Spray warm glycol on the hot water coils

In fin coil type heaters, individual room temperature is controlled by Choose one answer. a. Switches b. Automatic valves c. Dampers d. Air relays e. Supply ducts

In high efficiency furnaces, if the temperature of the flue gas drops below 65°C, the: Choose one answer. a. Flue gas will condense b. Water vapour will condense out of the flue gas c. Furnace burner will shut down d. Furnace burner will start up e. Furnace will cycle off

In hot oil heaters, hot gases moving through the furnace transfers the heat to a) a conduction heater b) a convection heater c) a radiant heater d) a space heater e) a superheater

In hot water boiler operation the maximum operating temperature should never exceed a) 77 degrees C b) 87 degrees C c) 100 degrees C d) 121 degrees C e) 131 degrees C

In many cases evaporator pressure must not be allowed to drop below a certain level to prevent which of the following results? a) frosting of coils b) evaporator valve lock c) tubing implosion d) overheating of the evaporator e) overheating of the compressor

In nearly all LP steam heating systems the feedwater: Choose one answer. a. Is condensate b. Requires daily close scrutiny of chemical values c. Contains a high percentage of makeup water d. Is deaerated e. Is softened

In newer steam heating systems, the condensate discharged by the steam traps, convectors, or other heating equipment, drains by gravity through the return piping to: Choose one answer. a. The boiler b. A condensate tank c. The condensate scrubber d. The deaerator e. The vacuum pump

In order not to be harmful to the metals used in hot oil systems the thermal fluid must a) be kept at a low temperature b) have a neutral pH value c) be noncorrosive d) be diluted with glycol e) be mixed with kerosene

In order to burn heavy fuels, they must be heated to approximately ----- C before they can be properly atomized a) 65 b) 75 c) 95 d) 50

In order to keep some hot oil flowing backwards through a standby pump and around the discharge check valve, it is important that the _______ valve of the standby pump be left open. Choose one answer. a. Bypass b. Suction c. Non-return d. Check e. Relief

In order to keep some hot oil flowing backwards through a standby pump and around the discharge check valve, it is important that the ____________ valve be left open. a) bypass b) suction c) automatic d) pneumatic e) relief

In order to lower the boiling point of the refrigerant it is important that the system maintain a) an extremely high vacuum b) very high pressure c) very low temperatures d) very fast refrigerant flow e) high absorbent circulation

In order to prevent a rope from untwisting under load: Choose one answer. a. It should be moistened b. It requires a synthetic binder c. It has counteracting left-handed and right-handed twists d. Each end requires "whipping" e. Rope thimbles should be used

In order to produce the strength of magnetic flux required in larger DC machines a) electromagnets are used b) copper switches are used c) permanent magnets are used d) the field windings are double wound e) booster transformers are used

In order to protect the driver, a start-stop air compressor should be equipped with a) an intercooler b) an automatic blowdown system c) safety heads d) pre-start automatic unloading e) manual cylinder bleed petcocks

In order to provide uniform steam distribution to the individual tubes of a steam coil, steam coils are designed to Choose one answer. a. Constantly eliminate air b. Constantly eliminate condensate, air, and non-condensable gases c. Constantly eliminate non-condensable gases d. Be installed with counterflow e. Provide minimal pressure drop across the coil

In refrigeration systems, the most common methods used to control the capacity of a reciprocating compressor are: Choose one answer. a. Cylinder bypass and hot gas bypass b. Intermittent operation and continuous operation c. Cylinder unloaders and variable speed drives d. Suction throttling and variable inlet vanes e. Cylinder unloaders and cylinder bypass

In severely cold weather what adjustment must be made to properly preheat the outside air? a) The temperature controller's throttling range must be increased b) The outdoor damper should be closed c) Two separate pre-heater coils should be installed d) Damper must be heated e) Preheat coil temperature should be increased

In steam coils with long tube lengths and heating large amounts of low temperature outside air, freezing problems are minimized by using: Choose one answer. a. Preheat coils controlled by an outdoor temperature controller b. Modulating control valves to control the steam heating coil output c. A two-position control valve to control coil output d. An oversized coil e. An oversized control valve

In the ammonia absorption refrigeration system the generator is used to convert the _____ aqua to _____ aqua. Choose one answer. a. Strong, weak b. Weak, strong c. Hot, cold d. Cold, hot e. High pressure, low pressure

In the case of a simple ice box which of the following heat transfers is correct? a) Air loses latent heat, ice does not gain any heat. b) Air loses sensible heat, ice does not gain any heat. c) Air loses sensible heat, ice gains sensible heat. d) Air loses sensible heat, ice gains latent heat. e) Air loses latent heat, ice gains latent heat.

In the case of radiators and convectors, the main sources of trouble are the: Choose one answer. a. Air vents b. Fins c. Push nipples d. Connecting rods e. Valves and traps

In the condenser of a refrigeration system: Choose one answer. a. Latent heat is restored to the refrigerant b. The surrounding medium must be hotter than the refrigerant c. The heat in the refrigerant given up in the evaporator must be restored d. The condensing medium absorbs heat from the refrigerant e. The high pressure vapour is converted to low pressure liquid.

In the kraft process, the chipped wood is further processed in one of the following: a) recovery boiler b) bleacher c) press d) hogger e) digester

In the lithium bromide absorption refrigeration system the generator is used to convert the _____ solution to a _____ solution. Choose one answer. a. Strong, weak b. Weak, strong c. Hot, cold d. Cold, hot e. High pressure, low pressure

In the past the most popular method used to provide ventilation in a residence or small building has been by: Choose one answer. a. Mechanical ventilation b. Natural ventilation c. Forced air d. Convection e. Unit ventilator

In the pneumatic control nozzle and vane system the: Choose one answer. a. Vane approaches the nozzle increasing air pressure b. Vane approaches the nozzle decreasing air pressure c. Nozzle pressure increases moving the vane further away d. Nozzle pressure decreases allowing the vane to move closer e. Vane and nozzle both move to maintain equilibrium

In the two, pipe variable vacuum steam heating system, the steam temperature can be varied from: Choose one answer. a. 200°C to as low as 100°C b. 150°C to as low as 100°C c. 150°C to as low as 55°C d. 105°C to as low as 55°C e. 105°C to as low as 45°C

Infrared heaters send out _____ energy in the form of invisible infrared waves that travel in straight lines through the air. Choose one answer. a. Convection b. Conduction c. Radiant d. Microwave e. Electrical

Infrared radiant energy is directed towards: Choose one answer. a. Ceilings b. Walls c. Windows d. Floors e. Doors

Inputs for logic and supervisory computer functions are mainly a) by switch contacts b) actions of an operator using the keyboard c) stored on a disk which is required for operation d) controlled by relays e) non-decision making

Instantly show the values of different variables to the operators and maintenance personnel. a. Transmitter b. Controller c. Indicator d. Recorder e. Process variable

Inter coolers should be equipped with a) moisture separators b) safety valves c) baffles d) vents e) automatic blow downs

Intercoolers a) cool the air in the cylinders b) are used on all compressors c) should have a safety valve d) are required to cool compressor lubricating oil e) cool the air at the inlet valves

Intercoolers a) must have a drain b) are more efficient when cooled with air than with water c) are used on double acting single stage compressors d) help increase the volume of the air e) should use an antifreeze solution

Intermediate and high fire burner nozzle may have higher capacities than primary burner nozzle to a) give greater firing variations b) prevent pressure surges c) prevent ignition puff-backs d) allow better boiler warm-ups

Iron and steel may be magnetized by rubbing the metal with a) stainless steel b) steel wool c) a brass rod d) a magnet e) an iron filing compound

Iron loses in a transformer are caused by? a. Eddy currents b. Magnetic hysteresis c. Harmonic distortion d. All of the above e. A and B

It is generally accurate to say that a) 9.8 kPa pressure results from every meter of water depth or height b) a water height or depth of 10.34 meters results in 1 kPa c) 1 kPa will result from a water head of 9.8 meters d) 10.21 kPa will result from 1 meter of static water head e) atmospheric pressure has no bearing on static water head

It is good design practice to select a steam coil size a) so that 100% of the coil capacity is needed when the air temperature entering the coil is -1 degrees C b) so that at least 40% of the coil capacity is needed when the air temperature entering the coil is -1 degree C c) so that at least 80% of the coil capacity is needed when the air temperature at the coil inlet is -1 degree C d) so that at least 10% of the coil capacity is needed when the air temperature at the coil inlet is -5 degrees C e) so that it is twice the size that is required to handle the heating load

It is good practice to select steam coils which require at least 40% of coil capacity when air temperature is 1 degree C for which of the following reasons? a) Steam flow is high enough at high temperature and prevents build-up and freezing of condensate b) The load on the circulating fan is kept from overheating c) The mixing valve will never cut out if capacity stays above 40% d) To avoid hot condensate splashing e) None of the above

It is important to drain an hot oil heater prior to attempting a radio graphic inspection, because a) oil and coke appear similar on the x-ray picture b) oil and coke give a similar sound when the tube is hammered c) x-rays passing through the oil might cause an explosion d) drained tubes are cleaner for the radiologist to work with e) it is safer

It is not recommended to use an on-off switch for steam grid humidifiers because a) fogging would occur b) overheating would occur c) misting would occur d) wide fluctuations in relative humidity would occur e) all of the above

It is recommended that a new boiler be shut down, drained, opened up, flushed out and inspected after the first _____ months of operation. Choose one answer. a. Two b. Three c. Six d. Nine e. Twelve

It is recommended that the differential between the safety relief valve set pressure and the operating pressure of a hot water boiler be kept to a minimum of 69 kPa (10 psi) or __________ % of the relief valve setting. a) 10 b) 15 c) 20 d) 25 e) 30

It is very important that boilers should be: Choose one answer. a. Warmed up quickly to prevent condensation b. Warmed up quickly to prevent scale build-up c. Warmed up at a rate of one degree every five minutes d. Warmed up slowly to prevent thermal shock e. Lit only when cool

It is very important to open oil drain valves and plugs in the crankcase for which of the following reasons? a) The oil is very hot. b) The oil is very cold. c) Residual pressure in the crankcase may blow refrigerant vapour and oil out. d) Old oil is contaminated with refrigerant and may be very acidic. e) Oil can never be drained below the critical minimum level.

It is vitally important to slowly heat up a cold boiler to prevent: Choose one answer. a. Smoky flue gas b. Uneven expansion c. Even expansion. d. Low efficiency e. Cavitation in the boiler feedwater pump

Ladders that are used in the workplace should comply with: Choose one answer. a. WCB regulations only b. ASME codes c. CSA standards only d. Local building codes e. WCB regulations and CSA standards

Lantern rings: a)1. prevent liquid leakage from the pump b)2. are fed by a liquid c)3. provide a seal to prevent air from entering the pump d)4. are mostly used on high lift pumps e) 234

Large areas, such as warehouses, are usually heated by: Choose one answer. a. Unit heaters b. Radiators c. Convectors d. Open heaters e. Space heaters

Large journal or sleeve bearings have grooves a) in the high pressure area of the bearing Babbitt b) cut into the bearing housing c) for distributing lubricant evenly just after the pressure area d) in the non-pressure area e) cut in them for cooling purposes

Laying up a boiler means: Choose one answer. a. Raising the boiler b. Preparing the boiler for a period of storage c. Setting the boiler on its foundation d. Taking the boiler down for an annual overhaul e. Preparing a boiler for start up

Leak testing for tightness under pressure of a refrigeration system a) is done by the manufacturer b) is done with oxygen c) is done with ammonia d) is done with an inert gas e) is done with softened water

Leak testing on a refrigeration system a) is done with a sulphur stick for freon refrigerant b) is done with litmus paper for freon c) is done with a sulphur candle for ammonia d) must be done with the compressor running e) is done with a vacuum on the system

Leakage from supply air ducts, when the ductwork is installed completely outside the conditioned space, Choose one answer. a. Adds load to the calculated sensible heat requirements of the conditioned space b. Adds load to the calculated specific latent heat load c. Must be subtracted from the return air duct leakage d. Must be added to the return air duct leakage e. Need not be considered in a heat loss calculation

Leakage tendency is determine by: a. Operating pressure b. Viscosity c. Density d. Molecular mass e. All of the above

Level, pressure, flow, temperature, composition, vibration, speed and clearance are all examples of: Choose one answer. a. Transmitters b. Process variables c. Sensing elements d. Disturbances e. Manipulated variables

Liquid fuel manual valves for an automatically controlled boiler should be opened a) prior to pre-purging b) after pre-purging c) immediately after completion of the pilot flame trial d) after the automatic main burner fuel level e) with the automatic main burner fuel

Liquid must be in its vapour form a) in order to measure density b) if purity is to be measured c) when a chromatograph is being used d) when conductivity is measured e) when resistance or reluctance is being measured

Liquids must be vapourized Choose one answer. a. In order to measure density b. If purity is to be measured c. When a chromatograph is being used d. When conductivity is measured e. When resistance or reluctance is being measured

Locating HVAC equipment in mechanical rooms is preferred: Choose one answer. a . So that larger equipment can be used b. To make the maintenance easier c. So that maintenance may be performed without disturbing occupants d. To make maintenance more difficult e. So that all equipment is close together

Lock washers: Choose one answer. a. Prevent marring of the work surface b. Distribute the lock nut force c. Allow oversized bolts or nuts to be used d. Reduce the chances of unwanted turning of the bolt or nut e. Prevent the equipment from being dismantled

Low oil flow shutdowns (FSDL) are usually installed on the: Choose one answer. a. Inlet line of the oil heater b. Outlet line of the oil heater c. Pump inlet line d. Surge tank line e. Pump discharge line

Low pressures and vacuums may be measured: Choose one answer. a. With a transducer b. With a rotameter c. In MPa d. With a manometer e. In milli-Newtons

Low voltage systems may have an acceptable voltage variation of plus or minus a) 10% b) 5% c) 1.5% d) 7.5% e) 12.5%

Low water fuel cut-off must shut the fuel off before the water level drops to; a) the lowest possible water level b) the fire line c) the lowest visible water level in gauge glass d) 25 mm above the bottom of the gauge glass e) the lowest heating surface

Lowboy furnaces are just over _____ in height: Choose one answer. a. 1.0 m b. 0.8 m c. 1.4 m d. 1.6 m e. 1.2 m

Lubricant for an anti-friction bearing is a) mineral oil b) graphite c) calcium or lime base grease d) not required e) barium and lithium base grease

Machine bolts are most commonly supplied with a) pan heads b) oval heads c) Truss heads d) hexagon heads e) square heads

Magnetic field direction and intensity depend on the a) temperature of the EMF b) EMF of the magnet c) copper content of the magnet d) direction and intensity of current flow e) specific heat of the conductor

Magnetic flux can be said to be a) lines of force within a magnet and flowing N to S b) lines of force outside a magnet and flowing N to S c) a zone of lines outside a magnet d) lines of force flowing S to N outside a magnet e) lines of force flowing in a magnet

Manual or hand-operated expansion valves are seldom used in modern refrigeration systems except, occasionally: Choose one answer. a. To control the temperature of the evaporator b. In the bypass line around the automatic control valve c. To control the temperature of the cooling medium d. In the compressor oil cooling system e. To control the temperature of the condenser

Manway gaskets should be coated with an anti-seize compound a) which will act as a sealant and prevent leakage b) so the gasket will harden and set once temperature is raised c) thereby allowing the gasket to move during seating d) to prevent the gasket from sticking to the mating surfaces e) so that leaks will show up more readily

Materials used in sheet metal ducts are a) only copper b) only aluminum c) only stainless steel d) galvanized or black steel, aluminum, copper, and stainless steel e) only galvanized or black steel

Maximum static pressure in a fuel oil line before the oil pump is limited by code to approximately: Choose one answer. a. 10 kPa b. 15 kPa c. 80 kPa d. 35 kPa e. 70 kPa

Medium and high pressure duct systems require less space than low pressure duct systems, but this feature is partly offset by a) higher operating cost and higher initial cost of air handling apparatus b) costly special control devices and costly noise suppressing devices c) higher first cost for special equipment required to reduce the air velocity before distribution to the air space d) more costly fabrication and installation of duct work e) all of the above

Micrometers are available in a variety of types and are used mainly for the measurement of a) length, width, and thickness of the boiler house structure b) vertical, perpendicular and parallel distances in assembly of power plant machines c) outside, inside and depth dimensions of relatively small openings of objects d) the density of the boiler flue gases for pollution control e) dissolved solids in boiler water

Modern radiators are usually made of: Choose one answer. a. Steel b. Cast iron c. Stainless steel d. Copper e. Brass

Modular cast iron boiler water flow is: Choose one answer. a. Continuous through all modules b. Connected in series c. Intermittent, occurring only while the unit is firing d. Always vertically upwards e. Done without the use of headers or manifolds

Modular cast-iron boiler water flow is a) continuous through all chapters b) connected in series c) intermittent, occurring only while the unit is firing d) done without the use of headers or manifolds

Modular cast-iron boiler water flow is a) continuous through all modules b) connected in series c) intermittent, occurring only while the unit is firing d) always vertically upwards e) done without the use of headers or manifolds

Modulating combustion control on a heating boiler is accomplished by a) shutting down or lighting up the burner as pressure or temperature rises or falls b) regulating the air flow to control combustion c) changing the amount of fuel and air to the burner d) opening or closing the forced draft damper e) regulating the fuel and feed water flow

Modulating combustion control on a heating boiler is accomplished by: Choose one answer. a. Shutting down or lighting up the burner as pressure or temperature rises or falls b. Regulating the air flow to control combustion c. Changing the amount of fuel and air to the burner d. Opening or closing the forced draft damper e. Regulating the fuel and feed water flow

Modulating combustion control will a) change air and fuel flow proportionally to steam pressure change b) always be at set point when demand is at 50% c) alter only the air flow if a selector station is on manual d) respond to changes in atmospheric pressure e) always be a cascading control system

Modulating combustion controls Choose one answer. a. Regulate the steam and feedwater flow b. Regulate the fuel and air flow c. Control the atomizing air d. Control the combustion programmer e. Control the draft and feedwater temperature

Modulating combustion controls: Choose one answer. a. Regulate the steam and feed water supply b. Regulate the fuel and air supplies c. Modulate only the fuel flow, because air flow is kept at maximum throughout the firing range. d. Are found only on the smallest of boilers e. Operate at either high or low fire

Modulating dampers in air handling systems are NOT used: Choose one answer. a. To mix different air flows, such as outdoor air and recirculated air, in the correct proportions b. To vary the volume of conditioned air needed to meet load requirements c. As face dampers, to control the volume of air that goes through a cooling or heating coil d. As bypass dampers to throttle the air flow around a heating or cooling coil e. As relief dampers

Modulating dampers in air handling systems are used a) as mixing boxes to proportion the amounts of two different air flows such as outdoor air and recirculated air b) to modulate the volume of conditioned air needed to meet load requirements c) as face dampers to modulate the volume of air that goes through a cooling or heating coil d) as bypass dampers to throttle the balance of the constant total air flow around a heating or cooling coil e) all of the above

Modulating pressure control a) will shut down and start up the burner b) will control the fuel and air flow to the boiler c) will control the temperature of the furnace d) can be used on small boilers only e) will control the pressure of the boiler

Modulating pressure controller output: Choose one answer. a. Will shut down and start up the burner b. Will vary the fuel and air flow to the boiler c. Will control the temperature of the furnace d. Is used on small boilers only e. Is unresponsive to steam flow.

Molecular mass is a dependent factor in which of the following physical properties? a) miscibility b) leakage tendency c) toxicity d) flammability e) explosiveness

Most absorbency systems are put in place where there is cheap excess or waste heat available. What is this heat primarily used for? a) To pressurize the system b) To maintain the continuous vacuum c) To decrease the evaporation point of the refrigerant d) To run the pumps which force the water through the sprayers e) To evaporate the water out of the weak Lithium Bromide

Most building regulations prohibit single pipe systems over ________ in length from a hot water heater or hot water recirculating line. Choose one answer. a. 10.5 m b. 12.2 m c. 15.2 m d. 20.5 m e. 25.5 m

Most conductors tend to a) increase in resistance with increase in temperature b) decrease in resistance with increase in temperature c) shrink when heated d) melt when voltage is applied e) oscillate when voltage is applied

Most gas-fired infrared heaters use the principle of: Choose one answer. a. Indirect heating of a gas b. Heating a solid surface c. Heating a liquid d. Heating a porous material e. Catalytic oxidation of a fuel at high combustion temperatures

Most heater fuel controls are ____________ to prevent pilot burner fuel supply if hot oil flow is below a preset limit. a) locked b) interlocked c) unlocked d) jammed e) by-passed

Most low capacity cast iron boilers: Choose one answer. a. Cannot be site assembled b. Can withstand higher pressures c. Will pass through standard size doorways d. Are factory assembled as packaged units e. Require special foundations

Most low capacity cast-iron boilers a) cannot be site assembled b) can withstand higher pressures c) will pass through standard size doorways d) are factory assembled as packaged units e) require special foundations

Most pump failures, damage, or both occurs a) after about six months of continuous service b) due to vapor-binding c) during initial start-up d) due to wrong rotation e) because of inadequate operator training

Most solenoid valves are unlike globe valves in that upstream line pressure will a) act to open the valve b) be less than downstream pressure c) be sensed by a transmitter d) act to close the valve e) pass through a restriction or nozzle

Most solenoid valves operate so that the upstream line pressure will: Choose one answer. a. Act to open the valve b. Be less than downstream pressure c. Be sensed by a transmitter d. Act to close the valve e. Must pass through a restriction or nozzle

Most warm air heating furnaces are often equipped with a _____ to supply moisture to the air during the dry winter season. Choose one answer. a. Dehumidifier b. Humidifier c. Water sprayer d. Steamer e. Vaporizer

Natural draft cooling towers operate most effectively in large open spaces and a) where wind is relatively constant b) where relative humidity is high c) where a large body of water is nearby d) require a windbreak e) must not be in direct sunlight

Natural refrigeration is best described by the example of an: a. Cooling fan b. Outdoor rink c. Ice box d. Ceiling fan

Natural ropes are made of a) nylon b) polyethylene c) manila d) dacron e) polyvinyl chloride

Natural ventilation is improved by the use of a roof a) ventilator b) radiator c) grille d) louver e) panel

Negative pressure in a sanitary drainage system may result in which of the following problems: Choose one answer. a. Clogging of drain pipes b. Build up of scale in water closets c. Loss of trap sealing water d. Forcing of sewer gases through traps e. Collection of sediment in drain traps

Neglecting the efficiency of a 15 kW motor connected to a 400 volt supply, the amperage will be a) 26.667 amperes b) 37.5 amperes c) .0375 amperes d) 3.75 amperes e) 2.667 amperes

Neutralizing amines: Choose one answer. a. Raise the pH of condensate b. Lower the pH of boiler water c. Eliminate boiler pitting d. Can cause return grooving e. Absorb carbon dioxide

New pump packing should be installed a) tight enough to stop leakage b) loose enough to allow leakage for lubrication c) every shut down d) every year e) every time prior to start-up

Normally-closed solenoid operated valves open when Choose one answer. a. a coil is electrically energized b. pressure below the valve disc overcomes the spring pressure above the disc c. a pneumatic signal exceeds 20 kPa d. an electric motor opens the valve e. it is de-energized

Occupancy sensors typically use _________ for activation. Choose one answer. a. Loud sounds b. Ultraviolet energy c. Microwave energy d. Ultrasonic energy e. Proximity sensors

Occupancy sensors: Choose one answer. a. Are Semi-automatic switches b. Are Self-regulating switches c. Are Automatic switches d. Dim the lights when the room is unoccupied e. Are best suited where fluorescent lights are frequently turned on and off

Octal alcohol is added to the lithium bromide solution to: Choose one answer. a. Act as a drying agent b. Act as a wetting agent c. Prevent crystallization d. Help the lithium bromide solution absorb non-condensables e. Act as a dispersing agent

Of the following refrigeration system evaporators, the ___________ evaporators require the greatest refrigerant charge. Choose one answer. a. Direct expansion b. Bare tube c. Plate surface d. Flooded e. Finned tube

Of the following, which is a method of indirect electric heat? Choose one answer. a. Baseboard heaters b. Electric boilers c. Radiant panel heaters d. Wall heaters e. Unit heaters

Ohms Law can be stated as a) E = IR b) R = I/E c) I = R/E d) volts equals ohms divided by amperes e) watts times ohms equals volts

Oil added to refrigeration compressors a) is done when the compressor discharge valve is closed b) is done with a vacuum on the crankcase c) is done with the equalizing valve closed d) is done with the charging line open e) must be preheated

Oil additives a) should not affect all other characteristics greatly b) will always affect the pour point greatly c) should be used as little as possible d) are not a component of most lube oils e) never lose their effect during use of the oil

On a basic pneumatic transmitter, a movement of the flapper towards nozzle will: Choose one answer. a. Increase the nozzle bleed. b. Change the size of the supply orifice. c. Maintain steady transmitter output. d. Change transmitter supply pressure. e. Increase feedback bellows pressure.

On a boiler with high-low fire control, if the damper positioning switch is in the wrong position a) the damper motor may not operate b) a pre-purge will not occur c) a high fire main flame ignition could occur d) nothing will happen when the manual start switch is closed e) the pre-purge period will last indefinitely unless the problem is corrected

On a cluster burner, the high fire nozzle will: Choose one answer. a. Be in operation on start-up. b. Operate continuously when steam demand exceeds boiler capacity. c. Be ignited by a pilot flame. d. Operate regardless of where the manual over-ride switch is set. e. Respond to electrical resistance

On a gas fired automatic boiler a normal programmed start-up takes approximately a) 105 seconds b) 55 seconds c) 27 - 40 seconds d) 120 seconds e) 70 seconds

On a multiple steam boiler heating system, a stop valve must be placed at each boiler outlet to: Choose one answer. a. Permit slower system warm-ups b. Allow the boiler to be isolated from the system c. Prevent steam from entering another boiler d. Allow each boiler to supply only a part of the system e. Permit different system pressures

On a packaged boiler a number of electrical switches connected in series can be categorized as a) controls b) interlocks c) start-up devices d) programmer controls e) detectors

On a steam boiler with single element feed water control, the following item is measured: a) steam flow b) feed water flow c) boiler water level d) fuel flow e) feed water pressure

On a steam boiler with single element feedwater control, the following item is measured: a) steam flow b) feedwater flow c) boiler water level d) fuel flow e) feedwater pressure

On a two fixed capacity nozzle system both burners are lit when the system is: a. Low fire b. Initial start up c. High fire d. On-off cycling

One method of controlling the capacity of reciprocating compressors is to bypass the discharge from one or more cylinders back to the suction side of the compressor. The control is called a) compressor unloading b) dampering c) suction throttling d) cylinder bypass e) sectional evaporating

One negative factor of Hermetic type reciprocating compressors is a) the compressor and motor are mounted within the same housing b) the motor is cooled by the low pressure, low temperature vapour being drawn into the housing c) it does not have or require shaft sealing d) field servicing is not possible e) the compressor is driven by an electric motor

One of the advantages a forced warm air heating systems has over the steam or hot water heating systems is: Choose one answer. a. Its ease of installation of duct works b. That controlled amounts of ventilation air can be admitted c. The systems are maintenance free d. The systems are virtually noise free e. The systems do not require electricity

One of the advantages of a common exhaust duct system used for ventilation in a large building is: Choose one answer. a. No fan to maintain b. The building can be maintained at a slight negative pressure at all times. c. Only one fan to maintain d. Windows can be eliminated e. No power is required

One of the advantages of electric heating over other heating systems is: Choose one answer. a. Low operating cost b. No fuel storage or handling equipment c. Ideal for large warehouses d. High operating temperatures e. It can be direct or indirect

One of the advantages of electric infrared heating by quartz lamp is: Choose one answer. a. It can heat a large area effectively b. No ventilation is required c. It can be used as the main heating source for a large building d. It is not seriously affected by exposure to wind e. It can be used in explosive atmospheres

One of the advantages of gas-fired infrared heating over other types of heating systems is: Choose one answer. a. It can heat a large volume enclosure with little fuel b. It requires no fuel handling equipment c. It eliminates the need for ventilation d. It can provide effective spot heating e. It can be used efficiently as the main heating source for a large building

One of the advantages of the forced circulation heating systems as compared to the gravity heating systems is: Choose one answer. a. Large pipes can be used b. Small pipes can be used c. Low maintenance d. Low cost e. Low power consumption

One of the advantages of the low pressure serpentine water tube boiler is a) virtually no maintenance required b) virtually eliminates feed water treatment c) virtually eliminates expansion and contraction stresses d) virtually no operational supervision required e) virtually no need for tubes replacement

One of the advantages of the low pressure serpentine tube water tube boilers is a) ease of feed water treatment b) excellent water circulation c) low cost d) ease of replacement of defective tubes e) virtually no operational supervision required

One of the advantages of the one pipe forced circulation hot water heating system is: Choose one answer. a. An expansion tank is not needed b. An air separator is not needed c. Air vents are not needed d. A circulating pump is not required e. It is simple in design

One of the advantages of the radiant panel hot water heating system over the conventional heating system is: Choose one answer. a. Less piping is needed b. Low water flow resistance c. Low in cost d. Ease of repair of heating coils e. Even heat distribution throughout the rooms

One of the biggest heat losses in the warm air furnaces and space heaters is: Choose one answer. a. In the combustion chamber b. The flue gases c. Poor combustion design d. High combustion air temperature e. Poor air/fuel mixtures

One of the disadvantages of forced warm air heating systems is the: Choose one answer. a. Installation and maintenance costs are higher than steam heating systems b. Air contains too much moisture c. System can be quite noisy as compared to gravity warm air heating systems d. Poor air circulation e. High cost for the system due to specialty equipment required

One of the disadvantages of the gravity hot water system is: Choose one answer. a. The water temperature must be very high to compensate for heat losses b. Piping used must be rated for high temperature services c. There is a slow response to changes in heat demand d. The maximum water temperature is limited to approximately 100°C e. High maintenance

One of the first ways to detect a fault in a reciprocating engine is a) by sound b) temperature indication c) performance efficiency d) by oil consumption e) by smell

One of the legal responsibilities of the engineer during an inspection is to a) be in possession of an inspection certificate b) point out any known or suspected defects to the inspector c) have at least two staff members present at all times d) allow the inspector onto the premises, but only during working hours e) notify the Workers' Compensation Board of the inspection

One of the most widely used process variables in a system a) temperature b) pressure c) density d) purity e) flow

One of the reasons that industrial type water tube boilers are seldom selected for low pressure heating plants is a) high fuel consumption b) low overall efficiency c) poor water circulation d) high cost e) poor steam production

One purpose of the small valve on top of the shell or the water column on most boilers is to: Choose one answer. a. Signal when the boiler is full of water r. b. allow water into the boiler when the boiler is being drained or cooled preventing the formation of a vacuum. c. allow water to escape before the steam stop valve is opened during the warm-up period. d. allow air to escape from the boiler when the boiler is being filled with water. e. allow air into the boiler when the boiler is being filled with water.

One tonne of refrigeration is a) 13958 kJ per day b) 100 kJ per minute c) 233 kJ per minute d) 13958 J per hour e) 335 J per second

One tonne of refrigeration is: Choose one answer. a. 13 958 kJ per day b. 1000 kg of mass c. 233 kJ per minute d. 13958 J per hour e. 12000 BTU per hour

Packing gland seals are used on what compressor? a. Open type b. Hermetic type c. Large capacity ammonia compressor d. Rotating sliding vane design e. Helical rotor design

Pan type humidifiers with plates a) consist of rotating plates in a pan partially filled with water b) are placed in individual rooms to humidify the individual rooms c) consist of a shallow pan, partially filled with water in which absorbent plates are placed and the pan is installed in the supply plenum of smaller warm air furnaces d) consist of plates in a pan through which water is sprayed by a spinning disc or cone e) can be a power type or a bypass type

Parallel blade dampers a) are used only in small sizes with low velocity air b) are used when modulation of air flow is required c) have blades linked so adjacent blades rotate in opposite directions d) are often used on mixing boxes where two sets of dampers are mounted with blades direct e) are not suited for two position damper operation

Permanent magnets are used for a) the largest DC motors and generators b) constant speed alternators c) variable speed alternators d) the smallest DC motors and generators e) ensuring less maintenance

Petroleum oils are widely used as heat transfer media for systems operating up to a) 290 degrees Celsius b) 190 degrees Celsius c) 390 degrees Celsius d) 250 degrees Celsius e) 160 degrees Celsius

Piston displacement is defined as a) the distance along which the piston travels b) the cylinder bore c) the volume of refrigerant that can be circulated through all the cylinders per unit time d) piston stroke length e) the revolutions per minute of the compressor motor

Pistons and connecting rods are found in which of the following types of compressors? a) Reciprocating b) Rotary c) Centrifugal d) Both Rotary and Centrifugal e) Both reciprocating and centrifugal

Positive displacement air compressor types are a) centrifugal compressors b) gear compressors c) axial compressors d) multi-stage centrifugal compressors e) not capable of producing high discharge pressures

Positive pressure testing of a new refrigeration system may be done Choose one answer. a. Using litmus paper b. By filling the system with oxygen c. By filling the system with ammonia d. By filling the system with an inert gas e. By filling the system with softened water

Pre-mixing lube oil and fuel or having a special lube oil injection system is typical of the average a) snowmobile engine b) automobile engine c) aircraft engine d) tractor engine e) heavy equipment engine

Preferably, dynamic pumps should be located a) directly under the liquid source when suction lift is involved b) above the liquid source when suction head is involved c) above the liquid source when suction lift is involved d) at the liquid source level when suction lift is involved e) below the liquid source when suction head is involved

Pressure controllers can be divided into two classes: Choose one answer. a. High and low temperature b. High and low pressure c. High and low flow d. High and low voltage e. Panel mounted or duct mounted

Priming a water pump means a) raising the suction line to the level of the water b) removing the foot valve to allow the water to flow through c) closing the discharge valve before starting the motor d) filling the pumps casing and suction line with water e) the water is foaming in the pump

Priming of a centrifugal pump refers to a) removal of water from pump b) filling the pump casing with liquid and removing the air c) lifting the pump d) closing the vent on the pump casing e) starting the pump driver

Prior to a boiler safety valve popping during routine boiler operation: Choose one answer. a. A try lever test should be performed b. The pressure gage should be checked c. The high limit switch should open d. The feedwater pump should stop e. The high level alarm should sound

Prior to a worker entering the steam drum of an off-line boiler that is connected to a common, pressurized steam header, the Choose one answer. a. Worker must be equipped with the correct tools and a list of required repairs b. Worker must be provided with a safety kit for confined space entry c. Worker must be provided with a safety line, first aid kit, and hard hat d. Main steam, blowdown and feedwater valves must be closed, locked and tagged e. Drum must be vented, the safety valve must be gagged, and all ash and soot removed from the fire box

Prior to hoisting an object it is best to a) know the route required b) know or calculate the mass c) measure its length d) attach at least two slings e) measure the width

Proper performance of heating and cooling water coils depends on a) adequate air velocity over the finned surface b) counter flow arrangement of air and water c) air venting from the system and the coil d) tube circuiting and finning e) all of the above

Proper priming and venting of a pump is important, especially if a) the medium being pumped is high temperature b) the medium being pumped contains suspended solids c) the pump has a stuffing box and lantern ring d) a mechanical seal is used e) oil or other low flash point lubricant is being pumped

Proper ventilation makes a building comfortable and habitable for its occupants. Which of the following is NOT a function of effective ventilation? : Choose one answer. a. to provide fresh air b. to remove smoke from the air c. to prevent condensation on the walls d. to create air circulation e. to increase the humidity of the air

Proportional band or throttling range is the: Choose one answer. a. Control method in which the final control element moves proportionally to the deviation of the controlled variable from the set-point b. Control algorithm that combines the proportional and integral algorithms c. Compensation action where a decrease in the compensation variable has the same effect as an increase in the controlled variable d. Control point range through which the controlled variable must pass to drive the final control element through its full range e. Sustained deviation between the control point and the setpoint of a proportional control system under stable operating conditions

Psychrometers are a) instruments used to determine the purity of air b) meters used to measure air speed c) meters used to measure the density of air d) instruments used to measure atmospheric pressure e) instruments used to determine the relative humidity of air

Psychrometry is a) the study of the behavior of people b) the study of the behavior of air c) the study of the behavior of water vapour d) the study of the behavior of mixtures of air and water vapour e) the study of the behavior of ideal gases

Pump wear rings are installed on an impeller by set screws, threading or a) shrinking b) welding c) brazing d) soldering e) forging

Pumps handling cryogenic materials operate a) as staged units b) at extremely low temperatures c) nearly always as dynamic units d) as tandem units e) as high speed units

Putting a controller on manual control means: Choose one answer. a. The operator controls the final control element. b. The controller output responds to a process variable. c. There is no control of the final control element. d. The operator manually adjusts the process by changing the process variable signal e. The automatic controls have failed.

R-22 (Freon-22) is nontoxic and nonflammable. Which group does it belong to? a) Group A2 b) Group B4 c) Group A1 d) Group A3 e) Group B2

R-22: Choose one answer. a. Is non-toxic b. Has a strong, pungent odour c. Is explosive when mixed with air d. Is highly toxic e. Is not an ozone-depleting substance

Radiators can be classified as: Choose one answer. a. Floor, window or ceiling b. Window, duct or floor c. Wall-hung, floor, and window d. Legless, ductless and floor e. Cast iron, steel and copper

Raising the condensing point (saturation temperature) of the refrigerant vapour above the temperature of the cooling medium is the function of the a) compressor b) condenser c) evaporator d) absorber e) refrigerant

Raising the condensing point (saturation temperature) of the refrigerant vapour above the temperature of the cooling medium is the function of the: Choose one answer. a. Compressor b. Condenser c. Evaporator d. Absorber e. Refrigerant

Reaction turbines a) have all of the steam pressure drop take place in the stationary nozzle b) have a velocity increase in the fixed blading c) are used for higher speed only d) have a velocity decrease through the fixed blading e) require little blade sealing

Reaction turbines a) have bucket shaped blades b) have a pressure drop through the moving and stationary blades c) are used for high pressures only d) have a pressure drop in the moving blades only e) have little axial

Reciprocating Compressor Types are? i. Open type ii. Hermetic type iii. Semihermetic type iv. Rotating sliding vane design v. Helical rotor design a. i, ii, iv b. ii, iii, v c. i, ii, iii d. iii, iv, v e. i, iii, v

Reduction in sealing qualities between the piston rings and cylinder wall by the lube oil may be the result of a) low cooling water temperature b) high lube oil viscosity c) high cooling water temperature d) high carbon residue of the lube oil e) wrong fuel being used

Refrigerant compressors a) must have inter-coolers b) could be a centrifugal type c) are of the positive displacement type only d) are used with vapour absorption systems only e) discharge directly into the evaporator

Refrigerant condensers a) are always water cooled b) cool the gas refrigerant discharged from the compressor c) have a safety valve d) remove sensible heat only from the refrigerant e) are not required for freon type refrigerants

Refrigerant evaporators a) always have the refrigerant on the shell side b) are located between the expansion valve and the receiver c) may have brine pumped past the coils in an indirect system d) may be of the walk-in type e) are usually oil cooled

Refrigerant evaporators a) are only used in ammonia systems b) are part of the high side of the system c) are used to transfer oil d) are only used with very high pressure refrigeration systems e) are used to transfer heat

Refrigerant mediums will evaporate a) when pressure is increased b) when temperature is increased c) when they are diluted d) when temperature is decreased e) when heat is removed

Refrigerants will evaporate when the: Choose one answer. a. Pressure is increased b. Temperature is increased to saturation temperature c. They are diluted d. Temperature is reduced below saturation temperature e. Heat is removed from them

Refrigeration is usually measured in: a. Kilojoules b. Kilowatts c. Tons d. All the above

Regulations require that the minimum distance between an oil-fired furnace and an indoor oil storage tank must be: Choose one answer. a. 7 m b. 5.2 m c. 2.1 m d. 4.7 m e. 9.8 m

Relative humidity a) increases when the air temperature is raised without the addition of moisture to the air b) remains the same when the air temperature is raised c) decreases when the air temperature is raised without the addition of moisture to the air d) remains the same when the air temperature is lowered e) decreases when the air temperature is lowered without the addition of moisture to the air

Relative humidity is a) the ratio of water vapour in the air compared to the total amount water vapour the air could contain at a given temperature b) equal to the dry bulb temperature divided by the wet bulb temperature c) equal to the wet bulb temperature divided by the dry bulb temperature d) the ratio of the mass of water vapour divided by the mass of dry air e) the ratio of the mass of water vapour divided by the mass of wet air

Relative humidity is a) the actual mass of moisture present in a specific amount of air b) the ratio of the mass of moisture contained in a specific amount of air to the maximum amount of moisture this specific amount of air can contain c) the maximum mass of moisture that a specific amount of air can contain d) the ratio of the mass of air contained in a specific amount of moisture to the maximum amount of air this specific amount of moisture can contain e) a specific amount of air saturated with moisture

Relative humidity is the amount of a) moisture contained in the air compared to the maximum amount of moisture the air is capable of holding at the stated temperature b) moisture contained in the air compared to the maximum amount of moisture the air is capable of holding, air temperature being irrelevant c) air contained in the air-moisture mixture compared to the maximum amount of air the air-mixture moisture is capable of holding at the stated temperature d) air compared to the amount of moisture in the air at any temperature e) moisture contained in the air at 0 degrees C

Relative to a dry-pipe fire system, an automatic air supply shall be connected so that proper pressure can be maintained in each system, is a statement of the a) National Fire Protection Association Code b) Industrial Accident Prevention Association c) Canadian Standards Association d) Occupational Health and Safety e) Society of Municipal Fire Marshall's

Relative to flow, velocity is kinetic energy and when velocity increases, the a) pressure and potential energy, will also increase b) cross-sectional area of the piping will be increased c) the mass quantity flowing per second will decrease d) potential energy in the form of pressure will decrease e) density will decrease

Relative to lubrication, one place where wear is beneficial is a) new Babbitt bearing surfaces which wear smooth b) on pump wear rings c) on the oil pump sealing surfaces d) on the cylinder walls of internal combustion engines e) in anti-friction bearings

Relative to plant maintenance, a power engineer should have easy access to a) all ASME codes b) the Chief Inspector c) the Workers' Compensation Board Accident Prevention Regulations d) all plant maintenance records and schedules e) equipment suppliers

Relief dampers a) allow air flow in both directions b) allow air flow in one direction only c) allow air mixing d) are the same as bypass dampers e) are the same as face dampers

Rotary pumps: 1. are high pressure pumps 2. must be primed 3. use mechanical seals 4. are positive displacement pumps a) 1, 2 b) 2, 3 c) 1, 4 d) 1, 3, 4 e) 1, 2, 3, 4

Rotary pumps: a)1. have tight clearances on all moving parts b)2. deliver high pressure liquid without pulsations c)3. are positive displacement units d)4. should not be started with discharge closed e) 134

Run time totals, recorded by a computer, are commonly used: Choose one answer. a. In graphic displays b. For inventory control c. For logic supervisory systems d. For maintenance management e. With a modem

Rust in the gauge glass is an indication that: Choose one answer. a. The boiler should to be blown down b. Raw water is leaking into the boiler c. The copper and brass seats of the valves are deteriorating d. Corrosion is occurring in the system e. It is time to add boiler chemicals

Scaling is not as severe in towers when compared to boilers because a) tower water does not evaporate b) there are not as many dissolved solids in tower water c) pressure is not as high d) temperatures are not as high e) water is constantly being aerated

Sectional evaporators, installed in a refrigeration plant, control their capacity by Choose one answer. a. Varying the quantity of air passing over the evaporator coils b. Intermittent operation of the compressor c. Using solenoid valves to stop the refrigerant flow to one or more evaporator sections d. Altering the evaporator pressure in one or more of the evaporator sections e. Switching gear in the compressor

Seepage in return air ducts turned within the conditioned space may have what kind of effect? a) It will add to the amount of air needed to supply the cooled space. b) It will ruin the duct's insulation. c) It will increase the load on the air system in terms of volumes of air. d) It will increase the load on the air system in terms of pressure. e) It will create a loss of cooling effect.

Semi-rigid fibrous glass blankets attached to the insides of the ducts are in place to mainly a) restrict spread of smoke b) insulate c) act as fire retardants d) attenuate airborne noises e) stop leakage in the seams of the duct work

Shaft misalignment during operation of a pump can be caused by bearing wear, thermal expansion, and a) shaft flexing b) throttling of the discharge valve c) overloading the pump d) loss of lubricant e) improper installation

Shaft sealing carbon glands are a) lubricated by the main oil pump b) limited to a temperature of 250 degrees C c) replaced monthly due to erosion d) self-lubricating e) metal sprayed components

Shaft sealing in high output turbines is done with a) water seals b) mechanical seals c) wear rings d) packing glands e) labyrinth seals

Shaft seals are used on what compressor? a. Open type b. Hermetic type c. Stationary single-blade design d. Rotating sliding vane design e. Helical rotor design

Sharing and transferring information between computers is termed a) analog b) multiplexing c) plotting d) number crunching e) networking

Shock Effect is a) a constant dry-bulb temperature of 25 degrees C b) a constant effective temperature of 15 degrees C c) the discomfort felt when a person moves from a much hotter space to a much cooler space or vice versa d) more apparent in the winter e) a constant wet-bulb temperature of 20 degrees C

Short radius elbows should be provided with a) stiffeners b) turning vanes c) mitre elbows d) positive lock dampers e) flexible connections

Shunt wound DC motors are common where speed must remain constant regardless of load such as on a) automobile starters b) machinist lathes c) portable drills d) traction engines e) grinders

Single serpentine water coil circuiting is used a) where the water velocity in the tubes is less than 0.3 m/s b) where the water velocity in the tubes is more than 2.4 m/s c) for any water velocity in the tubes d) where the water velocity in the tubes is between 0.3 and 2.4 m/s e) in applications requiring high water velocities and low water pressure drops

Siphon is not required between a pressure or an altitude gauge and a hot water boiler since these boilers are a) filled with steam b) partially filled with steam c) partially filled with air d) filled with water e) filled with water and air mixtures

Sleeve bearings on furnace fans require: Choose one answer. a. No lubrication b. Grease every six months c. A few drops of oil every six months d. A few drops of oil monthly e. Fluid lubrication

Slight smoking during the start-up of a cold oil-fired boiler is caused by: Choose one answer. a. Dislodging soot from the gas passes b. Having the initial fire too hot c. Over purging of the furnace d. A cold furnace e. Under purging of the furnace

Slow or insufficient heat in one or more rooms in a steam, heated building can be caused by a faulty: Choose one answer. a. Steam trap b. Condensate tank float switch c. Heater d. Return trap e. Boiler limit control

Slow or insufficient heat throughout a building heated by steam can be caused by: Choose one answer. a. Too high a firing rate b. Too low a firing rate c. Air leaks d. Condensate pump cavitation e. A defective steam trap

Small diameter pipe used in building hot oil systems is a) 25.4 mm or smaller b) 34.5 mm or smaller c) 45.2 mm or smaller d) 52.4 mm or smaller e) 80 mm or smaller

Smoking conditions during the operation of a boiler can be caused by a) improper air/fuel ratio b) steam demands too great c) low water conditions d) too much combustion air e) not enough fuel

Snow melting systems are usually filled with a) water only b) methanol and water c) ethylene glycol and water d) steam e) warm air

Special diverter fittings are required in the one-pipe hot water systems to: Choose one answer. a. Divert air from each convector b. Ensure condensate flow to the boiler c. Divert water from the condensate tank to the boiler d. Ensure an adequate flow of water through each convector e. Divert airflow from the boiler to the expansion tank

Standard air is a) the volume of 1 kg of air at 15 degrees Celsius and 100 kpa b) the mass of 1 cubic meter of air at atmospheric conditions c) the volume of 1 kg of air at ambient temperature and atmospheric pressure d) the volume occupied by 1 kg of dry air at 21 degrees Celsius and atmospheric pressure at sea level or 101.325 kPa e) the mass of 1 cubic meter of dry air at 20 degrees Celsius and atmospheric pressure

Starting, stopping or unloading of the compressor is usually done by all of the following operating controls except a) temperature actuated control b) viscosity activated control c) pressure activated control d) humidity activated control e) All of the above can control the starting, stopping or unloading of the compressor.

Static pressure exerted by air is measured by connecting a) a manometer at right angles to the air duct b) a bourdon tube pressure gage to the air duct c) a pressure gage with the opening facing air flow d) a manometer with the opening facing the air flow e) a manometer to the fan

Steam Coils must be designed to: i) constantly eliminate air ii) constantly eliminate condensate iii) constantly eliminate noncondensable gases iv) constantly maintain face velocity v) constantly eliminate air venting a) ii, iii, and v b) iii only c) ii and iv d) i, iii, iv, and v e) i, ii, and iii

Steam coil piping and trapping a) is the same as for hot water and glycol coils b) only handles steam and non-condensable gases c) differs from the hot water and glycol coil because it carries more fluids: steam, air, water, and non-condensable gases d) are installed in the horizontal position whenever possible e) can be supported directly by the coils

Steam coils a) should be installed with tubes in a vertical position to ensure positive condensate drainage b) when installed in the horizontal position, do not have to be pitched toward the return c) are installed exactly the same as are glycol coils d) do not require a vacuum breaker e) do not require air venting

Steam coils with a short tube length of 1.1 m or less a) are more likely to freeze, even if the steam trap is properly chosen b) are not recommended because they are more likely to freeze c) are more likely to freeze, even if the coil is properly piped and sloped d) are less likely to freeze if the steam trap is properly chosen and the coil is properly piped e) are less likely to freeze regardless of steam trap choice and coil piping

Steam coils with long tube lengths a) have the greatest freezing problems at extremely low temperatures such as -35 degrees C b) have the greatest freezing problems at temperatures of about -2 to -1 degrees C c) have freezing problems at any temperature d) are not likely to freeze at any temperature e) are less likely to freeze than steam coils with short tube lengths

Steam grid humidifiers used in HVAC systems achieve humidification by: Choose one answer. a. The installation of a steam coil in the entering air stream b. The installation of a water coil in the entering air stream c. Injecting steam directly into the rooms to be humidified d. Injecting steam into the spray water of an air washer e. Injecting steam in the supply air stream

Steam grid humidifiers used in air conditioning systems achieve humidification by a) the installation of a steam coil in the entering air stream b) the installation of a water coil in the entering air stream c) injecting steam in the supply air stream d) injecting steam into the spray water of an air washer e) injecting steam directly into the rooms to be humidified

Steel mechanical fasteners that are commonly used in the automotive industry and on plant machinery are classed as: Choose one answer. a. Carriage bolts b. Machine bolts c. Hexagon bolts d. Whitworth bolts e. Self tapping

Supply outlets should always be located: Choose one answer. a. In walls b. In floors c. In ceiling d. To best prevent cold drafts e. In baseboards

Synchronous motors are used to a) start alternators b) reduce the power factor of a power system c) prevent the need for a DC source of power d) improve the power factor of a power system e) drive variable speed loads

Synchronous motors have construction that is identical to a) reciprocating equipment b) gas turbines c) air driven motors d) centrifugal fans e) alternators

Temperature relief devices limit the temperature in domestic hot water systems to no more than: Choose one answer. a. 50°C b. 79°C c. 90°C d. 99°C e. 121°C

Temperature rise in a hot oil system during the period that the refractory is drying out is allowed at a rate of a) not more than 55 degrees Celsius per hour b) not more than 65 degrees Celsius per hour c) not more than 45 degrees Celsius per hour d) not more than 75 degrees Celsius per hour e) not more than 100 degrees Celsius per hour

Temperatures are measured by a) watt meters b) bourdon tubes c) thermowells d) pressure differential e) thermocouples

The Bourbon tube is often shaped in the form of a "C", having an arc span of about a) 180 degrees b) 360 degrees c) 200 degrees d) 90 degrees e) 270 degrees

The Bourdon tube is often shaped in the form of a "C", having an arc span of about: Choose one answer. a. 180 degrees b. 360 degrees c. 200 degrees d. 90 degrees e. 270 degrees

The CSA B52 code requires that pressure limiting devices shall be provided on all systems operating above atmospheric pressure, except on a factory sealed system containing less than _____ of group A1 refrigerant: Choose one answer. a. 9 kg b. 7 kg c. 10 kg d. 5 kg e. 3 kg

The Hartford loop will: Choose one answer. a. Only be installed on multiple-boiler systems b. Ensure continuous circulation of a hot water system c. Prevent steam from entering a steam pressure gage d. Prevent boiler water level from going below the lowest safe water level e. Replace the feedwater check valve

The __________ type tubes have fins on their outer surfaces. a) looped b) extended c) firetube d) flared e) tangential

The ___________ of the completed job depends largely on the care taken during laying out. a) time b) accuracy c) cost d) price e) size

The ______________ is a unitary air conditioning system that uses a direct expansion refrigeration system to provide cooling and dehumidification, serving a local area without using ductwork. Choose one answer. a. Unit ventilator b. Rooftop unit c. Window air conditioner d. High velocity terminal re-heat system e. Multi-zone system

The ______________ system overcomes the difficulty of returning condensate back to the boiler due to inefficient static head. Choose one answer. a. One pipe, gravity return system b. Two pipe, gravity return system c. One pipe, steam trap system d. Two pipe, return trap system e. Two pipe, steam riser system

The ____of a DC machine is built up of laminated steel plates mounted on the shaft. The coils are connected to a commutator mounted on one end of the rotor shaft. a) armature b yoke c) bearings d) coils e) rheostat

The ability of a refrigerant to be dissolved into oil and vice versa is called a) moisture reaction b) enthalpy c) density d) leakage tendency e) miscibility

The absorber is equipped with a pump for which of the following reasons? a) To force water into a finely divided state b) To keep the cycle pressure constant c) To decrease the refrigerant evaporation point d) To speed the absorption of water vapour e) To decrease contact between absorbent and refrigerant

The accessory which maintains efficient heat transfer by collecting oil that coats the tubes of the condenser is called a) a strainer b) a strainer-drier c) an oil scrubber d) a filter e) an oil separator

The activated carbon used for absorbing odours can often be reactivated Choose one answer. a. by heating it b. by cooling it c. by exposing it to a DC current d. with chlorine bleach e. by soaking it in water

The actual movable range of a metric micrometer is typically: Choose one answer. a. 30 mm b. 200 mm c. 250 mm d. 300 mm e. 25 mm

The advantage of a mechanical ventilation system is: Choose one answer. a. The system is self powered b. The system supplies a controlled amount of filtered and heated air. c. The entire system only requires one fan. d. It stratifies the air, to help with filtration e. There are no ducts required

The advantage of having duct furnaces instead of a large central furnace is: Choose one answer. a. Less initial cost b. Easier installation c. Better control of heat in each zone of the building d. Requires less space e. Lower maintenance costs

The advantage of using a venturi tube, rather than an orifice plate for flow measurement is it: Choose one answer. a. Produces less permanent pressure drop b. Costs less to install c. Requires only one pressure tap d. Is less bulky e. Is flexible

The air removed by the air separator is vented to the a) air space at the top of the boiler b) nearest convector c) dip tube d) expansion tank e) relief valve

The air side of a gas turbine re-generator is located a) before the compressor b) after the combustion chamber c) between the turbine and combustion chamber d) between the turbine and atmosphere e) downstream of the compressor

The apparatus which converts current signals to pneumatic and pneumatic to current signals is called a: Choose one answer. a. Converter b. Inducer c. Inverter d. Transducer e. Transformer

The approximate efficiency of a hot oil radiant heater is a) 25 - 35% b) 50 - 60% c) 30 - 40% d) 40 - 50% e) 45 - 65%

The approximate mass of a 15 cm "I" beam is a) 20 kg per running metre b) 60 kg per running metre c) 30 kg per running metre d) 26 kg per running metre e) 37 kg per running metre

The armature core of a DC machine is built up of lamination's of a) copper bars b) mica sheets c) reinforced carbon plates d) electromagnets e) silicon steel plates

The aspect of air conditioning that is responsible for replenishing stale indoor air with outside air is Choose one answer. a. Heating b. Cooling c. Ventilation d. Humidification e. Air circulation

The authority charged with responsibility for drafting regulations to cover the use of natural gas is the a) American Society of Mechanical Engineers b) Canadian Standards Association c) Fire Fighter's Union d) Gas Conservation Board e) Boilers and Pressure Vessels Act

The automatic expansion valve in a refrigeration system operates on the principle of balancing: Choose one answer. a. The volumetric expansion of a fluid against a return spring b. Evaporator temperature against a return spring c. Condenser pressure against a return spring d. Condenser temperature against a return spring e. Evaporator pressure against a return spring

The automatic purge system does not require? a. Vaccum pump b. Suction chamber c. Return chamber d. Storage chamber e. A and D

The average amount of water volume which evaporates from a cooling tower is a) 2% b) 10% c) 15% d) 5% e) 3.5%

The back flow prevention method consisting of two independent check valves with an automatic operating pressure differential relief valve located between them is called: Choose one answer. a. Air gap back flow prevention b. Double check valve c. Reduced pressure principle device d. Atmosphere vacuum breaker e. PVB

The body needs considerable time to adjust when moving from one space to another when temperature and humidity conditions vary widely. This may be described as a) shock effect b) comfort zone c) comfort condition d) effective temperature e) air/motion effect

The brine pump of a refrigeration system: Choose one answer. a. Circulates the refrigerant through the evaporator b. Pumps brine through the condenser cooling circuits c. Circulates the brine through the cooling circuits d. Maintains the brine level in the cooling circuit e. Is used to remove heat from the condenser

The burners in a cast iron boiler chapter are controlled by the a) temperature of the circulating water b) step controller c) ambient air temperature d) boiler operator

The capacity of a centrifugal pump a) varies with discharge pressure b) can be altered by speed variation only c) indicates that the unit is a positive displacement type d) should be varied by suction valve manipulation e) is fixed and can only be altered by changing the impeller

The capacity of a transformer can be increased by: 1. submerging the core and winding's in a tank of oil 2. submerging the core and winding's in a tank of water 3. forced air cooling the oil in a heat exchanger 4. wrapping the core with a thermal insulation 5. forced air cooling of the core a) 1, 3, 5 b) 2, 3, 4 c) 1, 4, 5 d) 2, 3, 4, 5 e) 2, 4, 5

The cast-iron sectional boiler is generally used for steam and hot water heating systems in a. Small sized buildings b. Medium sized buildings c. Large sized buildings d. All of the above e. A and B

The category of air conditioning which is responsible for getting outside air into the building to replenish the oxygen supply for the occupants is a) heating b) cooling c) ventilation d) humidification e) air circulation

The chilled water flow switch prevents the: Choose one answer. a. Cooling tower fan from starting if chilled water flow has not been established b. Cooling tower fan from starting if cooling water flow has not been established c. Refrigeration compressor from starting if chilled water flow has not been established d. Refrigeration compressor from starting if cooling water flow has not been established e. Refrigeration compressor from starting if cooling tower fan has not been started

The chilling coil in an automatic purger has a primary function to a) lower the operating temperature of the purger b) keep the system cooling while being purged c) increase the efficiency of the system d) keep discharge through the coil at the lowest available suction pressure e) separate refrigerant vapour from the non-condensable gases to be purged.

The clove hitch is used for attaching a rope to pull a) at right angles b) vertically c) horizontally d) straight e) upwards

The coils or winding's on a DC machine armature, are placed in_____________ cut in the face of the armature. a) bars b) holes c) pairs d) sequence e) slots

The combustion chamber of a gas turbine a) increases the pressure of the compressed air b) is heated between the load turbine and the compression turbine c) burns fuel with excess air d) is water cooled e) rotates at shaft speed

The combustion chamber of a serpentine tube water tube boiler is a) equipped with gas power burners b) located above the tube c) surrounded by the tube d) located below the tube e) enclosed by a non-insulated metal casing

The comfort of human beings is affected by the atmospheric conditions surrounding them. Which of the following is not an atmospheric condition which affects comfort? a) Temperature b) Relative humidity c) Saturation temperature d) Air movement e) Air cleanliness

The common standard control modes for a plant control system are a) integral and derivative b) proportional and reset c) proportional, reset, and integral d) reset, integral, and rate e) derivative, proportional, and integral

The common types of evaporators used in refrigeration systems are: 1. bare tube 2. the shell and coil 3. the plate surface 4. the shell and tube 5. double tube 6. the finned tube a. 1, 2, 3, 4 b. 1, 3, 4, 6 c. 2, 3, 4, 5 d. 3, 5, 6, 7 e. 4, 5, 6, 7

The common types of water-cooled condensers used in refrigeration systems are: 1. the shell and tube 2. the shell and coil 3. the double tube 4. the plate surface a) 1, 2, 3 b) 1, 3, 4 c) 2, 3, 4 d) 1, 2, 4 e) 3, 4

The commutator of a DC machine is made of copper bars mounted in a) glass b) micanite c) steel plates d) fiber-glass e) carbon rings

The component of a control system that adjusts the value of the manipulated variable a. Process variable b. Final control element c. Manipulated variable d. Controlled variable e. Transmitting variable

The composition of pure dry air is generally taken to be a) 23.2% oxygen and 76.8% nitrogen by volume b) 21% oxygen and 79% nitrogen by weight c) 23.2% oxygen and 76.8% nitrogen by weight d) 24% oxygen and 76% nitrogen by volume e) 21% oxygen and 79% carbon dioxide by volume

The compressed air used as atomizing air in the air atomizing oil burner is also called: Choose one answer. a. Secondary air b. Primary air c. Pre-mixed air d. Combustion air e. Post-compressed air

The compressor on the gas turbine a) can be driven by the load turbine b) is always of the axial type c) is always a multi-stage compressor d) is always independently driven e) is always a reciprocating type

The compressor which would favor volume over pressure would be the a) rotary lobe b) screw c) axial d) centrifugal e) sliding vane

The concentration of Lithium Bromide in an absorption refrigerating system will change during which of the following steps? a) Going through the expansion valve b) Going through the suction valve c) Cooling through the heat exchanger d) Absorbing water vapour in the absorber e) None of the above

The condensate that drains from the evaporator of a window air conditioner is: Choose one answer. a. Drained on the floor b. Drained to a pan below the condenser fan where it is thrown against the condenser coil and evaporates c. Piped to a drain on the evaporator side of the unit d. Used to add humidity to the room air e. Circulated over the evaporator coil to keep it clean

The condenser which is very expensive to clean and requires the tubes to be cleaned with acid and neutralized is the a) shell and tube condenser b) shell and coil condenser c) double tube condenser d) evaporative condensers e) baffle condensers

The connection provided on DC motors to supply the armature with power a) are slip rings b) are field poles c) is a rheostat d) is a commutator e) is a rotating conductor

The constant head connection in a remote water level indicator is made to the: Choose one answer. a. Feed water pump discharge b. Water space c. Atmosphere d. Feed water regulating valve e. Steam space

The constant volume system with perimeter heating provides air from the air-handling unit in the central mechanical room at approximately: Choose one answer. a. Ambient temperature b. 22°C c. 10.5°C d. 12.5°C e. 15°C

The contaminants in a natural gas may include a) hydrogen sulphide b) penthane c) hexane d) methane e) oxygen

The control used in a mechanical refrigeration system to maintain a constant level of liquid refrigerant in the accumulator tank of a flooded evaporator is called Choose one answer. a. A thermostatic expansion valve b. An automatic expansion valve c. A low-pressure float valve d. A hand operated expansion valve e. A high-pressure float valve

The device used to maintain a constant pressure throughout a pneumatic control system is called a: Choose one answer. a. Reducing valve b. Gradual switch c. Pneumatic valve d. Balancing valve e. Proportional band controller

The devices which are used to minimize vibration problems and premature wearing of the belts are called a) direct drives b) V-belt drives c) belt guards d) fluid drives e) outlet damper controls

The dewpoint is the a) temperature at which dew forms on the grass b) temperature at which water vapour will start to be absorbed into the air c) temperature at which water will start to evaporate d) pressure below which water vapour will start to condense out of the air e) temperature below which water vapour will start to condense out of the air

The dewpoint temperature scale is read on a psychrometric chart a) along the top horizontal scale b) along the saturation line, same scale as wet-bulb temperature, but is plotted along horizontal lines c) along the horizontal axis on the bottom of the chart d) along the right vertical axis e) along the left vertical axis

The difference between a convector and a radiator is: Choose one answer. a. The convector uses fans b. The radiator's fins are much larger c. The radiator is controlled by a thermostat d. That one is made of cast iron and the other of steel or copper e. The radiator is a compact design.

The difference between static suction head and static discharge head is a) total static head b) static discharge head c) static suction head d) equivalent head e) dynamic head

The difference between the wet and dry bulb readings is called the a) wet bulb depression b) relative humidity c) dewpoint d) correction factor e) dry bulb depression

The direction of the ______________ due to motor action may be determined using the Left Hand Rule. a) force b) current c) resistance d) rotation e) applied voltage

The discharge pressure of steam heating pressure relief valves should never exceed a) 14.7 kPa b) 121 kPa c) 93 kPa d) 103 kPa e) 153 kPa

The drain of a hot water boiler low water fuel cutoff should be opened to flush out any debris: Choose one answer. a. Annually b. Daily c. Weekly d. Monthly e. Each shift

The dry-bulb temperature scale is read on a psychrometric chart a) along the left vertical axis b) along the right vertical axis c) along the saturation line and slope downward to the right d) along the top horizontal axis e) along the horizontal axis on the bottom of the chart

The electrical resistance of a thermistor will: Choose one answer. a. Decrease when cooled b. Decrease when heated c. Increase when heated d. Remain constant with temperature changes e. Depend upon its application

The electromagnetic field for a DC machine is termed the a) armature b) yoke c) field poles d) brush gear e) commutator

The emergency discharge line in a refrigeration system a) is located only on the condenser b) should have a shut-off valve outside the building c) is required on all sizes of refrigerating units d) is located on the evaporator e) is a vented sewer line

The enthalpy of a vapour is a. Sensible heat of a liquid b. Sensible heat of a liquid plus latent heat of evaporation c. Latent heat of evaporation

The entrained air in a hot water heating system is directed to the: Choose one answer. a. Relief valve b. Boiler c. Radiator vents d. Expansion tank e. Atmosphere

The equivalent resistance of three resistances 10 ohms, 25 ohms and 50 ohms connected in parallel is 1/RT= 1/R1+1/R2+1/R3 a) .16 ohms b) 6.25 ohms c) 85 ohms d) 18.75 ohms e) 62.5 ohms

The evaporator which increases heat exchange by crimping thin metal plates to its form is which type of evaporator? a) Plate surface b) Bare tube c) Shell and tube d) Finned tube e) none of the above

The exhaust steam from a steam turbine is more acceptable for process than the exhaust from a steam engine because a) it is much hotter b) it is easily controlled c) it is free of oil d) it is free of moisture e) it contains more condensate

The expansion and contraction rod type of temperature relief device will open the valve at __________ degrees Celsius and close it at __________ degrees Celsius. a) 99 and 80 b) 100 and 71 c) 101.3 and 75 d) 99 and 71 e) 100 and 80

The expansion tank is normally attached to the a) boiler or the hot water supply line near the boiler b) highest point in the system directly above the boiler c) supply line after the circulating pump d) supply line above the lowest convector e) return line directly before the boiler

The expansion valve in a refrigeration system Choose one answer. a. Expands the liquid to the receiver b. Relieves high pressure in the receiver c. Regulates the liquid refrigerant flow to the evaporator d. Is used to charge the refrigeration system e. Isolates the compressor from the condenser

The expected temperature and pressure at the exit of a fired hot oil heater are: Choose one answer. a. 120°C and 60 kPa b. 235 to 290°C and 450 kPa c. 60°C and 120 kPa d. 450 to 500°C and 255 kPa e. 150 to 300°C and 100 kPa

The external inspection of a boiler a) may include making sure the valves are in good operating condition b) may include making sure the furnace refractory is in order c) may include making sure the tubes are free of scale d) must be done after the boiler has been drained e) may include making sure the exterior of the tubes are in good condition

The external inspection of a boiler: Choose one answer. a. May include making sure the valves are in good operating condition b. May include making sure the furnace refractory is in order c. May include making sure the exterior of the tubes are in good condition d. Must be done after the boiler has been drained e. May include making sure the tubes are free of scale

The fact that the system can be treated against corrosion is an advantage for which system? a) A run around system b) A heat pipe c) A heat pump d) A thermal wheel e) A heat valve

The field rheostat in a DC generator is used to adjust the _______________ of the motor. a) direction of rotation b) current c) output voltage d) torque e) slip

The field strength of an alternator can be adjusted by varying the amplitude of the DC power supplied to the a) rotating field b) stator winding's c) alternator frame d) rotating stator e) shaft

The field strength of an alternator may be changed by varying the amplitude of the DC power, supplied to the rotating field by: 1. the use of a field rheostat 2. a reducing gear 3. changes of the input frequency 4. electronic control a) 1, 2, 3 b) 1, 4 c) 1, 3, 4 d) 2, 3, 4 e) 3, 4

The final step in replacing a fire tube is a) a light re-expansion b) filling the boiler with water and checking for leaks c) applying a hydrostatic test d) firing the boiler up to normal working pressure e) annealing the tube ends

The fins cast on the flat surface of the sections of a cast iron sectional boiler are used for the purpose of increasing the a) effectiveness of heat transfer b) steam capacity c) water capacity d) water circulation e) steam output

The fins cast on the flat surface of the sections of a cast iron sectional boiler are used for the purpose of increasing the: Choose one answer. a. Effectiveness of heat transfer b. Steam space c. Water space d. Water circulation e. Steam quality

The float chamber of the low water cut-off is blown out often to prevent a) the chamber collecting sediment b) the electric wiring from deteriorating c) the mercury from oxidizing d) the magnets rusting e) water hammer to the chamber

The flow arrangement best suited for hot water coils is a) the counter flow arrangement because it is more efficient b) the parallel flow arrangement because it gives better protection against freezing c) one in which the cold air enters the coil where the coldest water is flowing d) the half serpentine e) the triple bypass flow arrangement

The flow of electrons in a uniform direction from atom to atom through a circuit, is known as a) electromotive force b) potential difference c) a short circuit d) current e) voltage drop

The flow of electrons in a uniform direction is called a) voltage drop b) electrical current flow c) potential difference d) electromotive force e) direct current

The flow of water in a multiple-circuit hot water heating system is controlled by: Choose one answer. a. Vacuum pumps b. Diverter fittings c. Balancing valves d. A circulating pump in each heating zone e. An expansion tank in each heating zone

The flow through an oil heater is controlled a) automatically b) manually c) proportionally d) generally e) by pressure changes

The footing drains in a storage heater is used to a) eliminate pressure build-up in the heater. b) monitor unsafe temperatures. c) release steam should the heater malfunction to avoid flashing of steam in the fixtures. d) remove sediment carried to the heater through the water line. e) shut off the flow of gas if the flame and pilot light are extinguished.

The forms commonly used for power-plant equipment control include analog, digital, mechanical, pneumatic and: Choose one answer. a. Physical b. Electrical c. Manual d. Thermal e. Magnetic

The fuel for a diesel engine is a) light fuel oil b) vaporized by a carburetor c) mechanically atomized by high pressure d) atomized before the cylinder e) mixed with air before the cylinder

The fuel oil supply pressure in a modulating burner and pilot system is a approximately a) 950 kPa b) 1500 kPa c) 1380 kPa d) 2000 kPa

The function of a check valve is similar to the function of which type of damper? a) A manual damper b) A modulating damper c) A two-position damper d) A relief damper e) A louver

The function of the condenser in a refrigeration system is to: Choose one answer. a. Lower the temperature of the liquid refrigerant b. Change high pressure refrigerant vapour to liquid c. Pressurize low pressure refrigerant vapour d. Vent off vaporized refrigerant e. Lower the liquid refrigerant pressure

The function of the condenser is to a) vaporize the liquid refrigerant b) change high pressure refrigerant vapour to liquid c) pressurize low pressure refrigerant vapour d) vent off vaporized refrigerant e) lower the liquid refrigerant pressure

The function of vibration absorbers is to a) lower noise levels b) reduce pipe hammer c) increase longevity of the system d) insulate piping and make the system more efficient e) allow the load on the system to increase dramatically without straining the components in the system

The funds available for the air conditioning portion of the building refers to which factor of system selection? a) Building function b) Capital cost c) Building layout d) Operating costs e) Maintenance requirements

The furnace refractory in a boiler should be ___________ to prolong its life. Choose one answer. a. Wash coated with a dilute solution of heat resistant cement b. Painted with heat resistant paint c. Oiled d. Wire brushed e. Washed with a high-pressure hose

The furnace walls in a bent-tube water tube boiler are formed by water filled tubes and these walls are called a) furnace walls b) water walls c) fireside walls d) waterside walls e) radiant walls

The gas burners of a horizontal rectangular direct-fired oil heaters, are located a) on the floor of the furnace b) in the ceiling of the furnace c) in the front of the furnace d) in the corners of the furnace e) external to the furnace

The low water fuel cut-off of an unattended automatically fired heating boiler should shut the fuel off if the water level drops below: Choose one answer. a. Below the top row of tubes b. The furnace tube c. The lowest visible water level d. 25 mm above the bottom of the gauge glass e. The lowest permissible water level

The lubricant for an anti-friction bearing a) will separate the moving parts completely b) must be cooled c) could be a semi-solid lubricant d) prevents axial trust e) should have a high viscosity

The lubricant performs a number of functions. Indicate which of the following are the most important: a)1. reduce wear b)2. temperature control c)3. reduce corrosion d)4. reduce friction e) 1& 4

The magnetic field in a DC machine may be supplied by permanent magnets in small units. Large DC machines use field poles that are essentially a) insulators b) resistors c) non-magnetic d) flux resistant e) electromagnets

The main advantage of a pump using a mechanical seal is a) lower first cost b) less maintenance c) less lubrication d) smaller shaft required e) increases discharge pressure

The main component of any computer is the: Choose one answer. a. Keyboard b. Screen c. Modem d. Printer e. Central processing unit

The main components of a DC machine are the yoke or frame which supports the ____and the rotor which is called an armature. a) wiring b) field poles c) rheostat d) fuse box e) generator

The main disadvantage of a sawmill gang saw is a) the logs cannot be turned, nor the thickness varied b) it produces a very small volume of smoothly sawed lumber c) it produces a large volume of roughly sawed lumber d) the logs can be turned, but the thickness cannot be varied e) the thickness can be varied, but the logs cannot be turned

The main disadvantage of electric heating is the a) high maintenance cost b) poor local temperature control c) expensive installation d) high operating cost e) all of the above

The main function of a mainframe computer system is to a) evaluate systems by comparison b) rapidly process large amounts of data c) perform only a specific dedicated task d) produce "hypothetical" solutions to problems e) act as a networking switch

The main function of a mainframe computer system is to: Choose one answer. a. Evaluate systems by comparison b. Rapidly process large amounts of data c. Perform only a specific dedicated task d. Produce hypothetical solutions to problems e. Act as a networking switch

The main function of an air conditioning duct system is a) to only transmit return air from the space to be conditioned b) to only transmit supply air from the air handling apparatus c) to only transmit air to the refrigeration compressor d) to transmit supply and return air between the air handling apparatus and the space to be conditioned e) to transmit air from the refrigeration compressor to the condenser

The main function of gas burner is a) atomization of the fuel b) a source of ignition c) mixing of fuel gas / air prior to ignition d) regulation of the fuel flow

The main steam boiler control device used with an on/off combustion fuel control is a _____ sensing element. Choose one answer. a. Pressure b. Level c. Temperature d. Flow e. Pneumatic

The manual fuel shut-off valves of an automatic oil-fired boiler must be opened Choose one answer. a. Prior to pre-purging b. After pre-purging and just prior to pilot ignition c. Immediately after completion of the pilot flame trial d. After the automatic main burner fuel valve opens e. At the same time as the automatic main burner fuel valve

The margin by which an automatic controller misses the desired value a. Agitation b. Disruption c. Disturbance d. Error e. Malfunction

The maximum temperature of oil which can be pumped by a hot oil pump if teflon is used as a non-metallic part of the mechanical seal is a) 100 degrees Celsius b) 250 degrees Celsius c) 350 degrees Celsius d) 150 degrees Celsius e) 200 degrees Celsius

The maximum voltage generated by a single loop DC generator occurs when the conductor is cutting the magnetic lines of force at an angle of a) zero degrees b) 45 degrees c) 90 degrees d) 120 degrees e) 180 degrees

The mechanical seal material in a hot oil pump determines the: Choose one answer. a. Temperature of the oil that can be pumped b. Pressure of the oil that can be pumped c. Volume of oil that can be pumped d. Viscosity of oil that can be pumped e. Capacity of oil that can be pumped

The minimum reading on an altitude gauge of a boiler in a large plant is from the top of the boiler to the highest point in the system plus: Choose one answer. a. 0.6 m b. 0.8 m c. 1.0 m d. 1.2 m e. 1.4 m

The minimum size of the blowoff piping of a steam heating boiler is: Choose one answer. a. 75 mm b. 51 mm c. 20 mm d. 19 mm e. 15 mm

The minimum voltage generated by a single loop DC generator occurs when the conductor is cutting the magnetic lines of forces at an angle of a) 45 degrees b) 90 degrees c) 120 degrees d) 180 degrees e) 270 degrees

The mixing box of an HVAC system uses a ______________ damper. Choose one answer. a. manual b. modulating c. two-position d. relief e. face

The most accurate way to determine the mass of an object, prior to attempting to hoist it, is to Choose one answer. a. Test lift it b. Err on the side of caution c. Use the manufacturer's original specification sheets d. Determine the volume of the material e. Check its relative density

The most common measurement made with a meter is a) amperage b) watts c) resistance d) voltage e) capacitance

The most commonly applied oil heater, is the combination convection and __________ type heater because of its efficiency. a) superheater b) conduction c) radiant d) stationary e) portable

The most commonly used types of water coil circuiting are a) single serpentine, double serpentine, and half serpentine b) full circuit, double circuit, and triple circuit c) single serpentine, double serpentine, and triple serpentine d) parallel and serpentine e) parallel, counter flow, and serpentine

The most efficient way to keep oxygen out of the boiler water system is to: Choose one answer. a. Add sufficient oxygen scavenger b. Keep make-up water to a minimum c. Operate the deaerator at a higher pressure d. Increase boiler blowoff e. Maintain a higher pH in the boiler water

The most important fitting installed between the operating switch of a steam boiler and the boiler itself is a Choose one answer. a. Tee with a plug b. Syphon c. Blowdown valve d. Test connection for an inspector e. Pressure gage

The most important rule in safe operation of a steam heating boiler is: Choose one answer. a. Operate the burner properly b. Keep the water level in the boiler at the proper level c. Maintain the proper operation of automatic controls d. Maintain the correct level in the altitude gauge e. Ensure air is kept out of the system

The most important rule in safe operation of steam boilers is to: Choose one answer. a. Watch the steam pressure b. Not overheat the boiler c. Ensure an adequate air supply d. Ensure a fuel supply e. Keep the correct water level

The most popular acid for boiler cleaning is a) sulphuric b) hydrochloric c) phosphoric d) nitric e) chelate

The most reliable method of checking or testing a low water fuel cutoff is to: Choose one answer. a. Blow the low water cutoff down through the water column until the burner cuts out. b. Blow the float chamber down to see if the burner will cut out. c. Lower the water in the boiler to the level where the burner should cut out. d. Blow down the sight glass to see if the burner goes out. e. Manually trip the mercury switches to shut off the burner.

The most reliable method of checking or testing a low-water fuel cut off is to a) manually trip the cut-off linkage to shut off the burner b) blow the float chamber down to see if the burner will cut out c) lower the water in the boiler to the level where the burner should cut out d) blow the low water cut-off down through the water column until the burner cuts out e) blow down the sight glass to see if the burner goes out

The most typical fired heater model is the a) down-draft b) dual-draft c) up-draft d) balanced-draft e) induced-draft

The most vital element to ensure effective heat transfer in a fin-type heat exchanger coil used for HVAC service, Choose one answer. a. The fin must be crimped b. The fins must be made of highly conductive material c. A good bond must exist between the tube and fin d. Narrow fin spacing is necessary e. Wide fin spacing is necessary

The most widely used refrigerant control which consists of bellows or a diaphragm chamber connected to a temperature sensing bulb by means of a small capillary tube is a/an a) thermostatic expansion valve b) automatic expansion valve c) low pressure float valve d) hand operated expansion valve e) high pressure float valve

The natural gas from the wells, for use in a gas processing plant, is known as: Choose one answer. a. Sour gas b. Emulsion c. Feedstock d. Hydrocarbon e. Well site supply

The operating control which uses a bi-metal element is a a) fluid expansion actuating control b) pressure actuated control c) humidity actuated control d) temperature actuated control e) solenoid actuated control

The operating pressure control will control the a) steam pressure in the boiler b) gas pressure to the burner c) water pressure to the boiler d) boiler furnace pressure e) steam pressure in the steam header

The opposition a device or material offers to the flow of electric current, is known as: a) a resistance b) a short circuit c) a voltage drop d) an insulator e) counter flow

The outdoor air inlet damper of an HVAC air handling unit may be split into two parts to provide: Choose one answer. a. Extra outside air when extra ventilation is required b. A means of controlling building static pressure c. Minimum outside air during periods when maximum air is being exhausted d. Maximum outside air during periods when minimum air is being exhausted e. Minimum outside air required for ventilation, during times of maximum return air recirculation

The output power of a gas turbine is directly related to the a) mass of gas passing through the turbine per second b) temperature at the turbine inlet c) mass of the unit d) slippage between the turbine and compressor e) turbine exhaust temperature

The output pressure signal of a transmitter relay is usually a) direct and proportional to nozzle pressure b) a function of supply pressure c) inversely proportional to nozzle pressure d) fed to a final element of a loop e) the same as the primary element output signal

The output voltage of a shunt dc generator may be varied by adjusting the a) field rheostat b) brakes c) output current d) number of poles e) main breaker disconnect

The output voltage rises sharply from minimum load to full load conditions for DC wound generators, if constructed with one of the following systems: a) shunt b) compound c) parallel d) anti-friction bearing e) series

The outside air is a a temperature of -25°C, and is saturated. This air is drawn into the building and heated to 21°C. What is the relative humidity of the air after passing through the heating coil? (Air at -25°C holds a maximum of 0.0005 kg of moisture/kg of water, and air at 21°C holds a maximum of 0.015 kg of moisture/kg of water). Choose one answer. a. 3.3% b. 0.015% c. 0.5% d. 10.6% e. 4.5%

The over speed trip of a steam turbine a) operates on turbine vibrations due to high speed b) is installed on all turbines c) can be adjusted according to the load demand d) is regulated by exhaust pressure e) sheds the load in the event of high pressure

The overall purposes of an oil refinery are to a) only remove the crude oil contaminants such as water and hydrogen sulphide b) only process the crude oil into specific end products c) only process the crude oil into diesel and gasoline d) remove crude oil contaminants and process the crude oil into specific end products e) only fractionate the raw crude oil into specific end products

The pressure ratio of a refrigeration compressor can be calculated by dividing the: Choose one answer. a. Discharge gage pressure by the inlet gage pressure b. Swept volume of a cylinder by its clearance volume c. Absolute inlet pressure by the absolute discharge pressure d. Absolute discharge pressure by the absolute inlet pressure, and then multiplying by the number of cylinders e. Absolute discharge pressure by the absolute inlet pressure

The pressure relief valve on a hot water heating boiler should be set a) 25% lower than operating pressure b) 10% lower than operating pressure c) 25% above operating pressure d) 20% lower than operating pressure e) at the operating pressure

The primary difference between direct and indirect refrigeration systems is the a) type of heat transfer medium b) type of refrigerant c) evaporator pressure d) compressor location e) evaporator location

The property of an oil which indicates its ability to support a load is a) viscosity b) viscosity index c) pour point d) floc point e) consistency

The property of resistance to conducting magnetic lines of force is known as a) resistance b) reluctance c) impedance d) repulsion e) voltage drop

The property which determines whether or not a material will be easily magnetized or not is called a) reaction b) conductivity c) fluctuation d) magnetism e) permeability

The property which has to be known for the calculation of the size of control valve and piping etc, is a) specific volume b) enthalpy c) refrigerating effect d) density e) boiling point

The provision of outside air into a building does not: Choose one answer. a. Provide "makeup" air b. Replenish the oxygen supply c. Dehumidify or humidify the air d. Remove odors e. Ventilate the building

The purpose of "cooking" in a pulp mill is to: Choose one answer. a. Soften the wood chips b. Remove the lignin from the wood chips c. Heat the wood chips d. Remove the fiber from the wood chips e. Remove the bark from the logs

The purpose of a re-generator is a) to clean the exhaust gases b) to improve the efficiency of the turbine c) to increase the temperature in the combustion chamber d) to lower the temperature in the combustion chamber e) to recirculate the exhaust gases back through the compressor

The purpose of a reformer in an oil refinery is a) to cause the molecular structure of the naphtha to change so that the octane rating is increased and also to produce the hydrogen for the hydrotreaters b) to remove the sulphur and nitrogen compounds from the diesel and naphtha c) to cause the naphtha to change so the octane rating is decreased d) to remove the water from the diesel e) to remove the water from the crude oil

The purpose of a spiral or a helix Bourdon tube is a) to increase the pressure rating b) to provide a greater degree of rotation c) to decrease the degree of rotation d) to decrease the linear motion e) to reduce fluttering of the indicator needle

The purpose of an inlet separator in a natural gas plant is to remove the: Choose one answer. a. Un-dissolved gases from the hydrocarbons b. Liquids from the gas c. Hydrogen sulphide from the gas d. Solids from the liquids e. Carbon monoxide from the liquids

The purpose of dampers in an air handling system is a) to control the flow of air b) to regulate refrigeration compressor speed c) to control the flow of water in a hot water heating system d) to regulate the fire in heating boilers e) to control the flow of water in a water cooling system

The purpose of dehydration in natural gas treatment plants is a) to remove water vapour and remaining hydrocarbon condensates from the main gas stream b) to lower the temperature of the hot condensates c) to remove hydrogen sulphide from the hydrocarbons d) to remove the liquid hydrocarbons from the gas e) to dry the carbon dioxide in the inlet separator

The purpose of having an upward movement of a switch handle to close the switch is a) to have the handle out of the way b) to meet the requirements of the electrical act c) because it is easier to operate when opening the switch d) it indicates the condition of the circuit e) to prevent the switch from closing due to gravity

The purpose of humidification is to a) add humidity to the air during the cooling season b) add humidity to the air during the heating season c) remove moisture from the air during the heating season d) remove moisture from the air during the cooling season e) add moisture to the air during the cooling season

The purpose of pressure relief valve on a constant capacity fuel supply is to: a. Relieve the pressure from the oil line any discharge it to atmosphere b. Re-direct fuel oil that above the set pressure back to the tank or strainer c. Protect the oil tank from rupturing d. All the above

The purpose of stabilization in natural gas treatment plants is a) to stabilize the gas from the contactor b) to flash off the gases at low pressure from the liquid hydrocarbons c) to stabilize the liquid and gas in the inlet separator d) to flash off the gases at high pressure from the liquids e) to prevent water from evaporating in the gas stream

The purpose of the "freeze-stat" temperature controller used with hot water coils is to a) close the outside air dampers and stop the fan if the heat source fails or the low limit temperature controller malfunctions b) increase the hot water flow through the coil if outside air temperature is too low c) increase the heat source temperature if the outside air temperature decreases d) open the outside air dampers wide when the outside air temperature rises e) increase the fan output if the return air temperature is too low

The purpose of the absorber in a natural gas plant is to a) remove condensates from the gas b) absorb all the hydrocarbons from the gas c) scrub the gas from amine d) remove hydrogen sulphide and carbon dioxide from the gas e) absorb carbon dioxide from the gas stream

The purpose of the fluid catalytic cracking unit (FCCU) in an oil refinery is to: Choose one answer. a. Receive the "reduced crude" and recover more gas oils by further distilling under high temperature and low pressure b. Remove hydrogen sulphide and nitrogen from the naphtha c. Cause the heavy hydrocarbons to be transformed into lighter hydrocarbons d. Remove the propane, butane and light ends from the crude oil e. Remove the sulphur and nitrogen from the diesel fuel

The purpose of the naphtha hydrotreater in an oil refinery is to: Choose one answer. a. Remove water from the naphtha b. Remove sulphur and nitrogen compounds before the naphtha goes to the platformer c. To cause the heavy hydrocarbons to be transformed into lighter hydrocarbons d. To remove water from the crude oil e. To remove diesel fuel from the naphtha

The purpose of the pipe siphon installed between the boiler and the pressure gauge is to prevent: Choose one answer. a. Air from entering the gauge b. Water from entering the gauge c. Hot steam from entering the gauge d. Air from entering the boiler e. Condensate returning to the boiler from the pigtail

The purpose of the reformer in an oil refinery is to: Choose one answer. a. Increase the octane rating of the naphtha and produce hydrogen for the hydrotreaters b. Remove the sulphur and nitrogen compounds from the diesel fuel and naphtha c. Remove octane from the naphtha, to be blended with gasoline d. Remove water from the diesel fuel e. Remove water from the crude oil

The purpose of the tee fitting on the piping leading to a boiler steam pressure gauge is to: Choose one answer. a. Bypass the siphon tube b. Test a sample of steam for purity c. Install the boiler inspector's pressure gauge d. Blowoff condensate from the pigtail e. Vent air from the pressure gauge

The purpose of the vacuum unit in an oil refinery is a) to receive the "reduced crude" and recover more gas oils by further distilling under high temperature and low pressure b) to only take off the propane, butane, and light ends from the crude oil c) the same as the fluid catalytic cracking unit d) to remove the hydrogen sulphide and nitrogen from the naphtha e) to remove the sulphur and nitrogen from the diesel

The purpose of turbine glands is to prevent a) water from entering the turbine b) steam from entering the turbine c) steam escaping from the turbine d) steam from entering the lubrication system e) oil from entering the turbine

The rate at which a system will remove heat from the refrigerated medium is defined as a) coefficient of performance b) net refrigerating effect c) refrigeration capacity d) compression ratio e) differential efficiency

The ratio of heat released to heat transferred to boiler water is known as the a) combustion efficiency b) heating surface efficiency c) boiler efficiency d) enthalpy transfer

The refrigerant R-152a belongs to the following group a) group "A2" b) group "B1" c) group "A3 d) group "2B" e) group "A1"

The refrigerant R-290 belongs to the following group a) group "A2" b) group "B1" c) group "A3 d) group "2B" e) group "A1"

The refrigerant R-600 belongs to the following group a) group "A2" b) group "B1" c) group "A3 d) group "2B" e) group "A1"

The refrigerant R-717 belongs to the following group a) group "A2" b) group "B1" c) group "A3 d) group "B2" e) group "A1"

The refrigerant R-764 belongs to the following group a) group "A2" b) group "B1" c) group "A3 d) group "2B" e) group "A1"

The refrigerant liquid charging valve connection is: Choose one answer. a. On the condenser b. On the compressor suction crossover valve c. On the liquid line after the liquid shutoff valve d. On the liquid receiver e. Between the evaporator and the compressor inlet

The refrigerating effect of a refrigerant is a) equal to its latent heat of vaporization b) greater than its latent heat of vaporization c) less than its latent heat of vaporization d) equal to its specific heat capacity e) equal to its specific volume

The refrigerating effect of a refrigerant is: Choose one answer. a. Equal to its latent heat of vaporization b. Greater than its latent heat of vaporization c. Less than its latent heat of vaporization d. Equal to its specific heat capacity e. Less than its net-refrigerating effect

The refrigeration condenser design that requires the tubes to be cleaned with acid and then neutralized, is the: Choose one answer. a. Shell and tube condenser b. Shell and coil condenser c. Air-cooled condenser d. Evaporative condensers e. Baffle condensers

The relative humidity should be maintained between a) 50% and 80% during the winter b) 20% and 60% during the winter c) 40% and 75% during the summer d) 25% and 60% during the summer e) 30% and 70% during the summer and the winter

The removal of hydrogen sulphide and carbon dioxide from the natural gas a) is done by boiling the gas b) is done in the inlet separator c) is done in the dehydrator d) is not necessary e) can be done with amine

The rotating field of an alternator is obtained by exciting the winding's on the rotor with a) AC power b) stator current c) magnetic particles d) DC power e) carbon poles

The run around coil heat recovery system uses a _____ coil in the inlet air duct and a _____ coil in the exhaust air duct. Choose one answer. a. Preconditioning, recovery b. Heating, cooling c. Cooling, heating d. Recovery, conditioning e. Heating, recovery

The safety control in a centrifugal compressor which ensures the compressor to only be started under a no-load condition is called a) low oil pressure cutout switch b) condenser high pressure cutout c) chilled water flow switch d) motor demand limiter e) vane closed switch

The safety control which uses a current transformer with a resistor in the motor circuit is known as a) high motor temperature cutup b) low oil sump temperature protection c) motor overload protection d) solenoid valve e) high oil temperature cutout

The safety head of a refrigeration compressor is designed to: Choose one answer. a. Unload over-loaded cylinders b. Be installed on a hermetic compressor c. Relieve pressure due to liquid in the cylinder d. Prevent explosion damage e. Operate in place of a safety relief valve

The safety valve discharge on a hot oil system returns to a) the pump suction b) the surge tank c) a unit user d) the process system e) the pump casing

The saturation temperature of a refrigerant is the same as its: Choose one answer. a. Boiling point b. Freezing point c. Flash point d. Fire point e. Auto ignition temperature

The scale on the dial of the pressure or altitude gauge on a hot water heating boiler shall be graduated approximately to not less than _____ times the maximum allowable working pressure. Choose one answer. a. 0.5 b. 1 c. 1.5 d. 2 e. 2.5

The scale on the dial of the pressure or altitude gauge on a hot water heating boiler shall be graduated to not more than _____ times the pressure at which the safety relief valve is set. Choose one answer. a. 1.5 b. 2 c. 2.5 d. 3 e. 3.5

The seal cage on the shaft of a centrifugal pump a) holds the shaft packing against the shoulder of the stuffing box b) assists in reducing shaft vibration c) distributes sealing water to the packing d) prevents water from leaking out of the pump casing e) reduces suction pressure drop

The sealed ball bearings used on a blower in the warm air heating systems: Choose one answer. a. Require regular lubrication b. Require a few drops of oil once or twice a year c. Should be dismantled every two years for maintenance d. Should be dismantled every five years for maintenance e. Require no lubrication

The second element of a two element feed water control system compensates for or offsets a) level variation b) differential feed water pressure c) differential steam flow rate d) feed water temperature variation e) shrink and swell

The second from last step in an automatic boiler programmed shutdown sequence is a) timer shutdown b) main flame trial c) post purge d) operating control switch contacts closing e) flame failure switch contacts opening

The sections in cast iron boiler are sealed using a) flexitallic gasket b) high temperature putty c) high temperature rope d) highly machined metal surface

The sections of a cast iron sectional boiler are held together by: Choose one answer. a. Cast iron pipes b. High-temperature rope c. Steel studs d. Push nipples and tie rods e. Stay bolts

The sections of cast iron boilers are mainly designed to obtain maximum a) water space b) steam space c) water circulation d) heat transfer e) steam output

The setpoint transfer from a day-time to a night-time setpoint, when a dual-temperature thermostat is used, is made by changing the air pressure from Choose one answer. a. 3 kPa to 15 kPa b. 5 kPa to 25 kPa c. 20 kPa to 90 kPa d. 0 kPa to 100 kPa e. 100 kPa to 125 kP

The specific volume of air is a) the volume of 1 kg of air at atmospheric pressure expressed in cubic centimeters b) the volume of 1 gram of air at atmospheric pressure expressed in cubic meters c) the volume of 1 kg of air at atmospheric pressure expressed in cubic meters d) the volume of 1 kg of air at any pressure e) the volume of 1 gram of air occupied at any temperature and pressure

The standard refrigeration cycle is used to compare refrigerants and machines operating under comparable conditions. These standard conditions are: a) 1030 kPa and atmospheric pressure b) 30 degrees Celsius condensing and -15 degrees Celsius evaporating c) 30 kPa and atmospheric pressure d) -30 degrees Celsius condensing and 15 degrees Celsius evaporating e) 30 kPa and atmospheric temperature

The stator of an alternator is built of ________________ mounted in a frame. a) copper alloys b) silicon steel c) carbon ring d) asbestos impregnated silver e) non-metallic materials

The steam and water spaces of a cast iron sectional boiler are connected by: Choose one answer. a. Tie rods b. Tie nipples c. Hydraulic jacks d. Steel studs e. Push nipples

The steam turbine that has a pressure drop across every set of blades is the __________ turbine. a) double-stage impulse b) single-stage impulse c) topping d) back pressure e) reaction

The strength of the magnetic field produced in a shunt wound generator a) is weak b) is fairly constant c) fluctuates d) is regulated by an external AC supply e) cannot be varied

The system which has a storage tank above the highest fixture in the system is called a) an up feed system b) a constant pressure system with suction tank c) a tank-less constant pressure system d) a down-feed system e) a direct pressure system

The system which makes use of a coil installed underground below frost levels is called a a) runaround system b) thermal wheel c) heat tube d) heat pump e) heat pipe

The system which runs as a refrigeration system used for air conditioning purposes in the summer and can be modified to run in reverse in cooler weather is called a a) runaround system b) heat valve c) heat pump d) heat pipe e) thermal wheel

The tap drill is always smaller than the tap, to leave sufficient material for the tap to produce ______ per cent of thread. a) 25 b) 30 c) 40 d) 50 e) 75

The temperature control on a steam to hot water converter, controls a) the pump speed b) the steam temperature c) the water flow d) the steam control valve e) the firing rate

The temperature in the evaporator a) depends on pressure in the receiver b) will decrease when the compressor stops c) depends on the pressure in the evaporator d) depends on the ambient temperature e) is controlled by the charging valve

The temperature indicator of a hot water boiler should indicate water temperature: Choose one answer. a. At the boiler inlet b. In the expansion tank c. Midway through the system d. At the boiler outlet e. In the boiler

The temperature of the oil in a fired oil heater is controlled by: Choose one answer. a. Increasing the oil flow b. Decreasing the gas flow alone c. Varying the firing rate d. Decreasing the air, flow alone e. Controlling water level in the drum

The temperature to which the air can be raised at the turbine inlet is a) an indication of a unit's power b) directly related to the unit's size c) a function of the air compressor input d) an indication of the unit's efficiency e) important for proper compressor performance

The term "relative humidity" applies to a) the percentage of moisture in the air as compared to the amount of moisture the air can hold at a specific temperature b) the weight of the moisture in the air c) the dryness fraction of the air d) the amount of moisture in the air e) the amount of humidity in the air

The term that refers to the normal electric supply voltage is ___________. Choose one answer. a. Operating voltage b. Low voltage c. High voltage d. Line voltage e. Standard voltage

The terminal reheat air handling system has very high energy consumption because: Choose one answer. a. The large volumes of air that it must supply b. The resistance to flow created by the duct work c. Excessive air leakage and air seepage in the ductwork d. It cools the air for the solar radiation heated zones and then reheats the air for the remaining zones e. Hot deck coils must be energized year-round to provide adequate dehumidification

The three main classifications of refrigeration compressors are: Choose one answer. a. Scroll, rotary, and positive displacement b. Axial, centrifugal, and positive displacement c. Centrifugal, dynamic, and positive displacement d. Reciprocating, rotary, and centrifugal e. Rotary, reciprocating, and lobe

The three main types of DC generators are the: 1. compound wound 2. parallel wound 3. series wound 4. reverse wound 5. shunt wound a) 1, 3, 5 b) 1, 2, 4 c) 2, 3, 5 d) 3, 4, 5 e) 2, 4, 5

The top of a ladder should extend approximately __________ above the level of the upper landing to which it provides access. a) 2 meters b) 0.5 meters c) 0.9 meters d) 0.2 meters e) 0.3 meters

The total number of lines of force per square meter in a magnetic field is a) known as the EMF b) controlled by varying the temperature c) called the magnetic flux d) determined by the north magnetic pole e) depends on the force of gravity

The total resistance of three resistances in a series circuit can be given as a) R1 + R2 + R3 b) 1/R1 + 1/R2 + R3 c) R1/1 + R2/2 + R3/3 d) R1 x R2 x R3 e) (R1 x R2 x R3)/3

The total static head of a pump a) is the capacity of the pump b) is the difference between the static suction head and the static discharge head c) is the discharge pressure in meters d) is all the parts of the pump casing e) is the discharge head of the pump

The turbine over speed trip: 1. prevents the turbine from vibrating 2. prevents the turbine exceeding the maximum rated speed 3. is operated by a spring loaded pin in the rotating blades 4. will close the steam stop valve 5. should be tested before the turbine is placed in service a) 2, 4, 5 b) 2, 3, 4, 5 c) 1, 2, 4 d) 3, 4, 5 e) 4, 5

The two basic varieties of mechanical atomizing oil burners are the: Choose one answer. a. Variable capacity and modulating burners b. Constant and variable capacity burners c. Modulating and cluster burners d. Rotary and reciprocating cup burners e. light oil and heavy oil burners

The two chief methods of chemical pulping are: 1. the sulphite process 2. the phosphate process 3. the sulphate process 4. the sodium carbonate process a) 1, 2 b) 1, 3 c) 2, 4 d) 3, 4 e) 1, 4

The two general groups of fans are a) rotary positive displacement and centrifugal b) reciprocating and centrifugal c) reciprocating and axial flow d) positive displacement and axial flow e) centrifugal and axial flow

The two major types of refrigeration systems are: Choose one answer. a. Frosting and non-frosting b. commercial and residential c. Type I and Type II d. Indirect and Direct e. High pressure and low pressure

The two pipe gravity return steam heating system, now obsolete, had the disadvantage that during startup, some steam could pass through a radiator without condensing and could enter other radiators via the return main, thus trapping: Choose one answer. a. Water in the center b. Steam in the center c. Condensate in the center d. Debris in the center e. Air in the center

The two pipe reverse return hot water heating system has the advantage of: Choose one answer. a. All circuits have the same length b. Low cost c. No circulating is needed d. Elimination of an expansion tank e. Elimination of air vents

The two types of evaporators, dry evaporators and flooded evaporators differ principally in what respect? a) the dry evaporator cannot cool liquids b) method of refrigerant circulation c) type of refrigerant used d) size of the evaporator e) field maintenance availability of the types

The two types of wood pulping processes are the mechanical and the a) thermal b) industrial c) hydraulic d) triple train e) chemical

The type of brine used for skating and hockey rink refrigeration systems is usually a) calcium sulphate b) calcium chloride c) calcium carbide d) calcium nitrate e) sodium chloride

The type of circuit used to store (write) and retrieve (read) information from a computer is known as its: Choose one answer. a. Bytes b. Motherboard c. RAM d. CPU e. ROM

The type of combustion control frequently used on a small packaged boiler is Choose one answer. a. a semi-automatic control b. a modulating control c. a proportional control d. a constant pressure control e. an on-off control

The type of combustion fuel control frequently used on small package boilers, is a/an: Choose one answer. a. Scanner b. Modulating control c. High fuel level cut-off d. Constant pressure control e. On and Off control

The type of luminaire used in industrial warehouses and storage areas is the: Choose one answer. a. Open reflector b. Ceiling mount wraparound c. Recessed troffer d. Structural light e. Luminaire

The type of operation which stops the compressor when the desired low temperature of the substance to be cooled is reached and starts the compressor up again when the temperature rises to a set level is called a) intermittent operation b) continuous operation with reduced output c) cylinder bypass operation d) unloading operation e) variable guide operation

The type of pump normally used with a hot oil system is a: Choose one answer. a. Multistage reciprocating pump b. Conventional, single stage centrifugal pump c. Rotary screw pump d. Sliding vane pump e. Regenerative pump

The unit of current flow is the a) watt b) ampere c) ohm d) volt e) hertz

The unit of measure for electrical current flow is the a) Ohm b) Watt c) Volt d) Ampere e) Electron

The use of ethylene glycol solution will result in which of the following: i) Lower heat transfer rate ii) Better protection against freezing iii) Increased friction losses in the coil and piping iv) The requirement of a larger pump with more horsepower a) i and iv b) i and iii c) i and iv d) iii only e) i, ii, iii, and iv

The utility's responsibility will not go beyond the a) first branch line b) first over current device c) primary transformer d) first trunk circuit e) motor control center

The vacuum pump performs the following function: a) supplies water to the condensate receiver b) supplies steam to the boiler c) returns the condensate (water) back to the boiler d) returns the condensate water to the condensate receiver e) none of the a

The vacuum unit in an oil refinery: Choose one answer. a. Stores cryogenic material at a cold temperature b. Receives gas oils from the F.C.C.U. and at lower temperature and pressure 'cracks' the product c. Treats sour diesel with water d. Receives gas oils from the crude unit and distills it further at higher temperature and lower pressure e. Sucks up spilled oil

The value of the current flow in an electric circuit, where the voltage is 12 volts and the resistance is 3 ohms is a) 4 watts b) 36 amperes c) .25 amperes d) 4 amperes e) 3.6 amperes

The valves on a reciprocating compressor are opened by a) a pressure difference b) the cam shaft c) the eccentric d) hydraulic pressure e) a timing gear

The vane axial flow fan a) has a more spiral air flow than the tube axial fan b) has more turbulent air flow than the tube axial fan c) has lower efficiency than the tube axial fan d) has a less spiral air flow, less friction, and better efficiency than the tube axial fan e) is not suitable for duct mounting

The vapour space of the surge tank is a) a separate compartment in the tank where gas is separated from the oil b) the section where the oil can bubble c) a place where gas is added to the oil d) the space in the tank above the level of the oil e) the space in the tank below the level of the oil

The variable area meter consists of a) a fluid being measured, flowing through the tube from the top to the bottom b) a float across which the differential pressure varies c) a tube which is of constant area d) a tapered tube in which the fluid being measured flows through the tube from the bottom to the top e) an opening that can be varied as required

The voltage required to force a current of 15 amps through a resistance of 5 ohms would be V= AMP x Ohms a) .33 volts b) 3 volts c) 7.5 volts d) 33 volts e) 75 volts

The volume of standard air is a) 0.533 kg/cubic meters of dry air b) 0.633 kg/cubic meters of dry air c) 0.733 kg/cubic meters of dry air d) 0.833 kg/cubic meters of dry air e) 0.933 kg/cubic meters of dry air

The warm air outlets in a warm air heating system should always be located along the: Choose one answer. a. Inside walls of the rooms at or near the floor level b. Outside walls of the rooms on or near the ceiling and preferably over the windows c. Inside walls of the rooms near the ceiling d. Outside walls of the rooms at or near the floor level and preferably under the windows e. North-facing walls

The watt is an electrical unit of measure for a) resistance b) current flow c) potential difference d) power e) magnetic flux strength

The wet-bulb temperature is plotted on a psychrometric chart on the: Choose one answer. a. Right vertical axis b. Left vertical axis c. Lines which originate at the saturation line and slope downward to the right d. Horizontal axis on the bottom of the chart e. Relative humidity lines

The wet-bulb temperature scale is read on a psychrometric chart a) along the right vertical axis b) along the left vertical axis c) along the saturation line and slope downward to the right d) along the horizontal axis on the bottom of the chart e) along the top horizontal axis

The working medium in the dead weight tester is a) air b) water c) heavy oil d) medium weight oil e) alcohol

The yoke that supports the main components of the DC machines frequently made of a) copper or brass b) mica and carbon c) copper and carbon d) cast steel or iron e) aluminum

There are three main types of DC generators; series, shunt and compound wound. Each is a) separately excited b) capable of constant voltage regardless of load c) not excited by load current d) self-excited e) supplied with DC from batteries

There are two conditions that may occur during the warm up period which may seem to be abnormal to the operator but will disappear after the boiler heats up. These conditions are a) uneven expansion and thermal shock b) fluctuation of water and steam pressures c) slight smoking and condensation d) high stack and hot water/steam temperature e) low stack and hot water/steam temperature

Thermal resistance (R) may be defined as the: Choose one answer. a. Quantity of heat flow per unit time (in Watts) b. Ability of a material of uniform thickness to transmit heat (W/m°C) c. Heat transfer through a one-metre cross-sectional area of a particular material with defined surfaces (W/m2°C) d. Heat flow per unit time through one square metre of a material, when exposed to a differential temperature of 1 degree Celsius (W/m2°C) e. Reciprocal of thermal conductance (m2°C/W)

Thermal shock to boilers can be reduced by a) warming up boilers slowly b) keeping the boiler free of scale build-up c) covering the tube sheets with refractory d) not allowing full flow of cold water into a warm hot water boiler e) all of the above

Thermal shock to boilers can be reduced by: Choose one answer. a. Warming up boilers quickly b. Allowing the boiler to develop a thin, insulating coating of scale c. Slowly draining hot boilers d. Preventing the full flow of cold water into a warm hot water boiler e. Starting cold boilers on "automatic"

Thermal transmission may be defined as the: Choose one answer. a. Quantity of heat flow per unit time (in Watts) b. Ability of a material of uniform thickness to transmit heat (W/m°C) c. Heat transfer through a one-meter cross-sectional area of a particular material with defined surfaces (W/m2°C) d. Heat flow per unit time through one square meter of a material, of a particular composition and thickness, when exposed to a differential temperature of 1 degree Celsius (W/m2°C) e. Reciprocal of thermal conductance (m°C/W)

Thermal transmittance (U) may be defined as the: Choose one answer. a. Quantity of heat flow per unit time (in Watts) b. Ability of a material of uniform thickness to transmit heat (W/m°C) c. Heat transfer through a one-metre cross-sectional area of a particular material with defined surfaces (W/m2°C) d. Heat flow through one square metre of a material, per unit of thickness and unit of time when exposed to a differential temperature of 1 degree Celsius (W/m2°C) e. Reciprocal of thermal conductance (m°C/W)

Thermocouples are connected in series to: Choose one answer. a. Monitor more than one flame source b. Increase the sensitivity of the detection system c. Generate a higher voltage d. Provide redundancy if one should fail e. Create what is called a "flame rod"

Thermostats may be classified according to their a) application b) type of temperature sensing element c) type of control action provided d) temperature range e) all of the above

This occurs when the temperature of a strong but still unsaturated solution is lowered so far that its salt concentration exceeds the maximum concentration possible at the lower temperature. a) Ionization b) Dissociation c) Crystallization d) Vaporization e) Neutralization

Three factors which control the electromotive force developed by a DC generator are the: 1. size of the frame 2. speed with which conductors cut the magnetic lines of force 3. number of conductors cutting the magnetic lines of force 4. diameter of the conductors 5. strength of the magnetic flux 6. diameter of the armature a) 1, 3, 6 b) 2, 3, 5 c) 2, 5, 6 d) 1, 4, 6 e) 3, 4, 6

Three major losses which occur in a transformer are iron losses, copper losses and a) cooling losses b) heat losses c) flux leakage d) capacitive losses e) inductive losses

Three resistances of 20, 50 and 80 ohms make up a series circuit. Supply voltage is 400. The current flowing would be a) 2.67 amps b) 20 amps c) 8 amps d) 5 amps e) 60 amps

Three resistors of 20, 60 and 120 ohms are connected in parallel and the circuit amperage is 60. The applied voltage would be AMP/(1/Rt = 1/20 + 1/60 + 1/120) a) 7,200 b) 12,000 c) 800 d) 3.33 e) 0.33

Thrust bearings: 1. are used on reaction turbines 2. prevent the turbine rotor moving axially 3. are always installed on both ends of the rotor shaft 4. are lubricated with the same oil as the main bearings a) 1,2 b) 3,5 c) 1,2,4 d) 1,2,4 e, 2,3,4

To avoid liquid slugging in a direct expansion evaporator after shutting down a reciprocating or rotary compressor refrigerating system which of the following measures needs to be taken? a) Pump down the evaporator b) Fill the compressor with liquid refrigerant c) Fill the evaporator with refrigerant vapour d) Open all the suction valves on the connecting condenser line e) Discharge all the condenser refrigerant into the evaporator

To control static pressure in the air ducts a differential pressure controller is installed. How does the controller control static pressure? a) By increasing air temperature b) By decreasing air temperature c) By modulating the damper on the suction side of the fan d) By modulating the damper on the discharge side of the fan e) By grounding the duct work and carrying the charge to a battery

To determine the mass of an object you may a) calculate its area b) calculate its length c) use specification sheets d) determine the volume of the material e) check its relative density

To ensure effective heat transfer which of the following is the most vital element? a) The fin must be crimped b) Highly conductive material used in fins c) A good bond must exist between the tube and fin d) High fin spacing e) Low fin spacing

To ensure that each zone circuit has the proper flow of water to provide the required heat a: a) flow control valve is used b) diverter fitting is used c) gate valve is used d) pressure reducing valve is used e) balancing valve is used

To find various properties of air a) a psychrometric chart is used b) a Ringleman chart is used c) a Mollier chart is used d) a dewpoint chart is used e) an enthalpy chart is used

To keep humidifiers in top condition the plates of plate type units should be cleaned by soaking them in a slightly acidic solution and then washing them in soapy water to a) remove dirt b) remove grease c) remove soot d) remove mineral salts e) remove corrosion on the plate

To maintain space conditions during heating this system zone thermostat reduces the air flow to a minimum of 20% before modulating the output of the heat supply. Choose one answer. a. Hydronic heat pump system b. Fan coil unit with make-up air system c. Variable air volume system d. Dual duct system e. Constant air volume system

To measure valve tappet clearances one would most apply use a) an inside micrometer b) a thread micrometer c) a depth micrometer d) feeler gauges e) round or fillet gauges

To offset internal and external heat gains, a building requires Choose one answer. a. A humidifier b. A heat source c. Ventilation d. A cooling source e. A dehumidifier

To offset the heat gain through the building's exterior shell from solar radiation, the atmosphere surrounding the building, and from internal sources of heat, what is required? a) a humidifier b) a heat source c) ventilation d) a cooling source e) a dehumidifier

To operate the type of flame failure device which incorporates a lead sulphide cell, it must receive a) heat from flame b) ultraviolet rays c) infrared rays d) heat and radiation e) a digital signal

To overcome the head that a multi-story building exerts on a basement-located hot water boiler, Choose one answer. a. Additional hot water boilers are used b. Combination of steam and hot water boilers are used c. Larger hot water boilers are used d. Condensate pumps are used e. Steam to hot water converters are used

To prevent cooling tower basin water from freezing during cold weather many units are equipped with a) ethylene glycol antifreeze systems b) electric basin heaters c) propane burners d) ice defrosters e) warming tapes

To prevent corrosion in the expansion tank, it is sometimes filled with: Choose one answer. a. Nitrogen b. Air c. Oxygen d. Helium e. Sodium Sulfite

To prevent damage to a work surface while fastening a) do not over-tighten a nut b) use castle nuts only c) use toothed lock washers d) use flat washers e) use a lubricant during threading and tightening

To prevent damage to a work surface while fastening with bolts: Choose one answer. a. Do not over-tighten a nut b. Use castle nuts only c. Use toothed lock washers d. Use flat washers e. Use a lubricant during threading and tightening

To prevent flue gases from escaping in a cast iron sectional boiler, the spaces between the sections are sealed with high temperature a) silicon chalking b) foam insulation c) plastic insulation d) putty e) asbestos rope

To prevent freezing of downstream equipment in a coil handling a large amount of outdoor air, which of the following is required? a) A long coil length b) A vacuum breaker c) A preheat coil d) An over sized coil e) Two-position damper motor

To prevent freezing of the steam coil when steam pressure at the coil inlet is too low or is lost a) a second preheat coil is installed at the outside air inlet b) a modulating steam control valve is installed at the coil inlet c) a two-position steam control valve is installed at the coil inlet d) the fan output is increased e) provisions are made to stop the fan and close the outdoor air dampers

To prevent freezing of the steam coil when steam pressure at the coil inlet is too low, or is lost: Choose one answer. a. A second preheat coil is installed at the outside air inlet b. A modulating steam control valve is installed at the coil inlet c. A two-position steam control valve is installed at the coil inlet d. Provisions are made to stop the fan and close the outdoor air dampers e. Inverted bucket steam traps must be used

To prevent the possibility of a furnace explosion, it is important that the furnace is _____ before the igniter is energized and fuel is supplied to the burner nozzle(s). Choose one answer. a. Pre-heated b. Post-heated c. Purged d. Cooled e. Pressurized

To prevent too frequent starting and stopping of the compressor in a cooling system what should be done? a) Regulate the operation of the compressor with a set point thermostat b) Turn off the compressor when temperatures required for conditioning are reached c) Run the compressor continuously and vent any excess cold air d) Run the main fan only e) Run the compressor continuously and modulate refrigerant flow

To provide a two position damper, equipped with a fan that provides 100% outdoor air, with a ratio of damper opening what is required? a) A gradual switch b) Offset returned air duct c) An air mixer d) A three phase damper interchange e) A variable volume tank

To reduce air temperature between stages, we would use a) an intercooler b) an aftercooler c) a receiver d) a converter e) a chiller

To regulate the flow of water to a zone circuit a: Choose one answer. a. Flow control valve is used b. Diverter fitting is used c. Gate valve is used d. Pressure-reducing valve is used e. Balancing valve is used

To which of the following oil burners is the oil supplied under high pressure? Choose one answer. a. Mechanical atomizing burner b. Air atomizing burner c. Rotary cup burner d. Steam atomizing burner e. Multi-spud burner

Total pressure exerted by the air is the sum of a) suction pressure and velocity pressure b) head pressure and suction pressure c) head pressure and velocity pressure d) static pressure and velocity pressure e) head pressure, suction pressure, and velocity pressure

Total pressure exerted by the air is the sum of: Choose one answer. a. Head pressure, suction pressure, and velocity pressure b. Head pressure and suction pressure c. Head pressure and velocity pressure d. Static pressure and velocity pressure e. Suction pressure and velocity pressure

Transformer cooling oil has a) a very high specific heat b) a poorer insulating characteristic than air c) a very high fire point d) no factors which necessitate better wire insulation e) a very low safety hazard

Transformers are rated in terms of: 1. Volt amperes 2. Kilowatts 3. Kilo volt amperes 4. Ohms a) 1, 2 b) 2, 4 c) 2, 3 d) 3, 4 e) 1, 3

Transformers should be inspected at least a) quarterly b) bi-annually c) semi-annually d) annually e) tri-annually

Transformers should be inspected at least: Choose one answer. a. Quarterly b. Bi-annually c. Semi-annually d. Once or twice a year e. Every five years

Transmitters which transmit digital codes directly to a computer are known as a) digital transmitters b) smart transmitters c) analog transmitters d) pneumatic transmitters e) AND-OR devices

Turbine thrust bearings are fixed to the casing and prevent axial movement of the spindle by contacting a component on the shaft known as a a) shaft sleeve b) labyrinth c) collar d) shroud e) diaphragm

Turbines often have segmental carbon ring sealing glands which are held in place by a) labyrinths b) shrouding c) drive screws d) garter springs e) thrust runners

Two fan wheels are rotating at the same speed. One wheel has forward curved blades and the other has backward inclined blades. The velocity of the air leaving the forward curved blades is considerably higher for which of the following reasons? a) The centrifugal force of the forward curved blades is higher. b) The forward motion of the forward curved blades is higher. c) The air resistance of the backward curved blades is much lower. d) The inclination of the blades in the forward curved fan increases the resultant force vector while the backward curved blade inclination decreases the resultant vector. e) All of the above.

Two fan wheels are rotating at the same speed. One wheel has forward curved blades and the other has backward inclined blades. The velocity of the air leaving the forward curved blades is considerably higher, because Choose one answer. a. The centrifugal force of the forward curved blades is higher. b. The linear velocity of the forward curved blades is higher. c. The air resistance of the backward inclined blades is much lower. d. The velocity of the air leaving the fan blades, added to the linear velocity of the fan blades, is greater with the forward-inclined fan blades than backward-inclined fan blades. e. Fans with forward curved blades must be constructed with larger diameter wheels to provide the same airflow as a fan with backward-inclined blades.

Two methods of calculating air infiltration into a building are a) the crack and solar method b) the air change and solar method c) the crack and conduction method d) the air change and crack method e) the conduction and solar method

Two types of modern coils used for heating and cooling services in air handling systems are a) the continuous-plate finned surface and the spiral-finned surface b) the bare tube and the spiral-finned surface c) the continuous-plate finned surface and the bare tube d) the bare tube and the insulated tube e) none of the above

Ultraviolet light is used to remove _____ from the air. Choose one answer. a. Dust and pollen b. Fine dust and smoke c. Bacteria and spores d. Mists and fogs e. Lint

Using pressurized air to blow out a cleaned bearing a) should only be done when ventilation is maximum b) must be done only while the bearing is hot c) will cause the bearing to become "pitted" d) requires high pressure air e) can not cause damage to or affect our skin in any way

Using the psychrometric chart, find the enthalpy if the dry bulb temperature is 20°C and the wet bulb temperature is 15°C. Choose one answer. a. 40 kJ/kg b. 45 kJ/kg c. 55 kJ/kg d. 50.5 kJ/kg e. 42 kJ/kg

Using the psychrometric chart, find the relative humidity if the dry-bulb temperature is 25 degrees C and the wet-bulb temperature is 25 degrees C. a) 50% b) 90% c) 100% d) 95% e) 60%

Velocity pressure exerted by the air is measured by connecting a a) manometer at right angles to the air duct b) manometer with the opening facing the air flow in the air duct c) manometer to the fan d) bourdon tube pressure gage to the air duct e) pressure gage at right angles to the air duct

Very low humidity does not result in Choose one answer. a. Cracked lips b. Static electricity build-up c. Evaporation of moisture on the skin decreases d. At sufficiently high room temperatures people still feel cool e. Wood furniture and floor squeaks and cracks

Viscous filters are highly efficient in the removal of: Choose one answer. a. Fine dust, fumes, and smoke b. Bacteria and spores c. Cooking odours d. Dust and pollen e. Mists and fogs

WCB Regulations state: Tubular and similar type section scaffolding shall be erected plumb and __________. a) square b) straight c) without braces d) vibration free e) level

Water contained in the air stream at the discharge of a cooling tower is removed a) with centrifugal separators b) by a series of chevron dryers c) by refrigeration means d) by a series of baffles e) with drift eliminators

When a chiller has stopped due to low water temperature, and the chilled water temperature subsequently rises approximately 5-6°C above the chilled water temperature set point, the: Choose one answer. a. Compressor will restart b. Compressor will require a manual reset c. Cooling tower fan will restart d. Cooling tower fan will shut down e. Condenser pump will restart

When a closed expansion tank is used and the system is cold a) the auto fill valve will maintain a system minimum pressure b) the tank level will be high c) there will be no air in the tank d) the possibility of air in the system will be high e) the tank should be manually filled

When a closed type expansion tank on a hot water boiler is completely filled with water and the water in the system is raised in temperature so that it expands, the result will be that the: Choose one answer. a. Circulating pumps cavitate b. Pressure build up opens the safety relief valve c. Heating system becomes noisy d. Circulation pump will stop e. The boiler water will back-up into the potable water system

When a conductor is moved to cut magnetic flux lines at an angle of 90 degrees a) maximum resistance to current flow is attained b) current will flow with the least resistance c) motor action will be experienced d) voltage generated will be maximum e) motion will be easiest

When a diaphragm device is used for boiler water level measurement, the boiler pressure is compensated for or off-set by a) using a bellows on the HP side b) a spring which balances the differential pressure c) applying the pressure to both sides of the diaphragm d) reversing the reference and variable legs e) joining the reference and variable legs upstream of the device

When a fan outlet is considered fully open which of the following statements is true? a) Air volume delivery is considered a minimum. b) The pressure volume curve of a backward inclined fan increases. c) There is free air volume delivery. d) The power requirements for a forward curved fan are at a minimum. e) Vane axial fans have maximum horsepower requirements.

When a float is used for measuring level, and installation within a vessel is impractical, a device often used is the a) float manometer b) float cage c) differential head meter d) diaphragm level indicator e) head transmitter

When a greater than normal amount of combustible mixture is ignited, the result may be: Choose one answer. a. A boiler explosion b. A puff-back c. A negative furnace pressure d. A too rapid boiler warm-up e. Liquid fuel entering the furnace

When a liquid evaporates, it Choose one answer. a. Gains sensible heat b. Gains latent heat c. Loses sensible heat d. Loses latent heat e. Loses in heat content

When a material or substance does not form a magnetic flux easily it is said to have a) permeability b) resistance c) reluctance d) low field reluctance e) low magnetic flux

When a single main is used to carry both the steam supply from the boiler to the radiators and the steam condensate from the radiators back to the boiler, the system is called a one pipe: Choose one answer. a. Condensate return system b. Gravity return system c. Return trap system d. Vacuum pump system e. Variable vacuum system

When air-handling units use hot water heating coils, energy can be saved by: Choose one answer. a. Shutting of the hot water circulating pump when the air temperature set point is reached b. Switching over to electric heat when the outside air temperature drops excessively c. Preheating the water with the boiler exhaust heat d. Turning off the supply air fans when the air temperature setpoint is reached e. Adjusting the water temperature setpoint according to the outside air temperature

When all supply air duct is outside the conditioned space there is a certain leakage. This leakage must be calculated how? a) It must be added to the calculated room sensible heat load. b) It need not be considered in loss calculation. c) It must be subtracted from the return air duct leakage. d) It must be added to the return air duct leakage. e) It must be added to the calculated room specific latent humidity load.

When designing a lighting system which of the following should be considered? a) initial cost b) operating cost c) maintenance cost d) all of the above e) none of the above

When fan belts show signs of fraying, cracking, and wear, they should be: Choose one answer. a. Repaired b. Replaced c. Reported d. Re-tightened e. Realigned

When filling a hot oil system with oil and replacing nitrogen gas used to purge air from the system, __________ should be followed. a) a line b) a path c) a pattern d) an example e) a code

When filling a hot water system prior to putting it into service, it is most important to: Choose one answer. a. Close all valves and fill the system quickly b. Filter the water c. Remove the safety valve d. Vent all air e. Deaerate the water

When grease is used in an anti-friction bearing, the bearing housing should not be filled more than _______full. a) 1/4 b) 1/3 c) 1/2 d) 3/4 e) completely

When magnetic flux produced by one coil induces an EMF in a second coil, it is called: Choose one answer. a. Self inductance b. Electromagnetic induction c. Mutual inductance d. Capacitive reactance e. Inductive reactance

When one ampere of current flows through a resistance by the application of one volt the resistance will be a) one watt b) one ohm c) one kilowatt d) one ampere e) one kilovolt ampere

When replacing a firetube in a tubesheet, the tube end should extend beyond the tubesheet by: Choose one answer. a. 5 mm b. 1 tube wall thickness c. 10 mm d. 2 times the tube wall thickness e. 15 mm

When replacing a firetube in a tubesheet, the tube should extend beyond the tubesheet a) 5 mm b) one tube wall thickness c) 10 mm d) two tube wall thickness' e) 15 mm

When replacing or removing an anti friction ball bearing, the applied force should a) not be transmitted through the bearing balls b) always be against the inner race c) always be against the outer race d) be applied suddenly and fully e) be made only after heating the bearing

When starting up a steam heating boiler, it should be filled to: Choose one answer. a. The maximum level b. 3/4 of the gauge glass c. 1/2 of the gauge glass d. 1/4 of the gauge glass e. The bottom of the gauge glass

When starting-up a rotary pump you must be sure that the a) discharge valve is closed b) discharge valve is open c) pump is filled with air d) pump is at the correct temperature e) pump suction valve is closed

When storing a hacksaw a) the blade should be removed b) the saw should be stored in a protective sheath c) strain should be removed by loosening the blade d) it should be hung rather than laid in with other tools e) none of the above are applicable

When synchronizing an alternator; voltage, phase and frequency must all be the same as well as a) phase sequence b) speed c) current d) power e) capacity

When the maximum building demand for water is always less than the maximum flow available from a municipal or local distribution system which of the following systems can be used? a) A constant pressure system with suction tank b) A constant pressure system with pneumatic tank c) Tankless constant pressure system d) A downfeed system e) A gravity system

When the maximum building demand for water is always less than the maximum flow available from a municipal or local distribution system which of the following systems can be used? Choose one answer. a. A constant pressure system with suction tank b. A constant pressure system with pneumatic tank c. A tank-less constant pressure system d. A down feed system e. A gravity system

When the outdoor air damper increases the flow of fresh air, which of the following is true? a) The return air damper throttles up to reduce the volume of recirculated air. b) The return air damper throttles up to increase the volume of returned air. c) The return air damper is not affected. d) The return air damper throttles down to reduce the volume of returned air. e) The return air damper throttles up to increase the volume of returned air

When the pressure pointer of a closed system reads lower than the altitude pointer the a) system is full of water b) expansion tank level will be high c) boiler is being over-fired d) gage is faulty e) system requires water

When the return main of a gravity return steam heating system is located below the level of the water line in the boiler, it is called: Choose one answer. a. Flooded return b. Dry return c. Wet return d. Reverse return e. Direct return

When the steam outlet of a boiler is 51mm or larger, the boiler steam outlet stop valve should be a: Choose one answer. a. Non-rising stem globe valve b. Rising spindle gate or globe valve c. Non-rising spindle gate valve d. Rising spindle plug valve e. Motorized butterfly valve

When the steam pressure drop occurs only the stationary members or components of a turbine, the turbine is known as a) a single stage unit b) an impulse unit c) a reaction unit d) a Parsons unit e) a cross compound reaction unit

When the temperature of a solution increases, which of the following statements is true? a) The vapour pressure is high b) Less water molecules leave the solution c) The solubility of the salt decreases d) The concentration decreases e) The equilibrium constant decreases

When the temperature of a solution increases, which of the following statements is true? Choose one answer. a. The vapour pressure above the solution increases b. Less water molecules leave the solution c. The solubility of the salt decreases d. The concentration of the solution decreases e. The equilibrium constant decreases

When too much air has been absorbed by water in the expansion tank of a closed system, the tank must be: Choose one answer. a. Attached to an air separator b. Filled c. Removed d. Drained e. Replaced

When using compressed air to each cylinder for starting purposes, the pressure is approximately a) 520 kPa b) 255 kPa c) 3,030 kPa d) 2,100 kPa e) 435 kPa

When using lighted sulphur candles to test for ammonia leaks in a refrigeration system, the presence of ammonia will be indicated by a) a cloud of yellow smoke b) light brown smoke c) heavy white smoke d) heavy black smoke e) light red smoke

When using mechanical fuel oil atomization a) 70 kPa steam pressure is required at the burner b) 35 kPa oil pressure is required c) high pump pressure is required d) steam pressure is required to keep the by-pass open

When working on a platform it is important to a) always wear a lifeline harness b) ensure it is equipped with a full guard railing c) construct it yourself d) warn people on the ground of hazards e) notify the applicable government agency of usage

When working with high voltage systems, the minimum distance of approach should be a) 1 meter b) 5 meters c) 2 meters d) 3 meters e) 0.5 meters

Whenever feasibly possible, when checking bearings on running pieces of equipment it is wise to a) check the oil quality leaving each b) check the oil quantity leaving each c) get accustomed to normal running temperature and vibration by feel d) smell the normal odors of the running bearing e) observe the temperature on a thermometer

Whenever two or more sling eyes are used in lifting an object they should be a) of equal strength b) spaced evenly regardless of the object's center of gravity c) held in a shackle d) used only with a come-along e) fastened with a Crosby clip

Which of the following air dampers acts like a check valve? Choose one answer. a. A manual damper b. A modulating damper c. A two-position damper d. A relief damper e. A louver

Which of the following instruments use a battery-operated fan to draw air over the thermometer bulbs? a) hydrometer b) aspirating psychrometer c) sling psychrometer d) dry psychrometer e) potentiometer

Which of the following is NOT a characteristic of a dual duct system? Choose one answer. a. It provides a constant volume air circulation rate in each zone b. It provided good control of space conditions c. It can handle many more zones than a multi-zone system d. It is easier to modify than a multi-zone system e. Humidity control is excellent

Which of the following is NOT a component of the low pressure side of the system? a) compressor discharge b) evaporator c) downstream side of the regulating valve d) medium to be cooled e) all of the above

Which of the following is NOT a form of refrigeration evaporator construction? Choose one answer. a. Bare tube b. Plate surface c. Shell and tube d. Finned tube e. Double-tube

Which of the following is NOT a function of terminal air distribution devices? a) Distribute the air to the spaces b) Provide uniform space temperatures c) Control or counteract the effects of conduction, convection, and radiation d) Provide adequate air motion e) Create local still pockets of air

Which of the following is NOT a function of the refrigeration compressor? Choose one answer. a. Raises the pressure of the refrigerant b. Raises the temperature of the refrigerant c. Maintains a low pressure in the evaporator d. Circulates refrigerant through the system e. Removes energy from the vapour

Which of the following is NOT a hydronic heating system? Choose one answer. a. Loop system b. One pipe system c. Two pipe direct return system d. Two pipe reverse return system e. A wet-return system

Which of the following is NOT a refrigerant metering device? Choose one answer. a. Low-pressure float b. Automatic expansion valve c. Thermostat d. Capillary tube e. High-side float

Which of the following is NOT a result of having non-condensable gases in the absorption systems? a) Corrosion b) Oxidation of Lithium Bromide c) Lower than normal temperatures of the chilled water leaving the evaporator d) Reduction in capacity of the system e) Crystallization in the heat exchanger

Which of the following is NOT a type of oil burner? Choose one answer. a. Atmospheric burners b. Steam atomizing burners c. Mechanical or pressure atomizing burners d. Centrifugal or rotary cup burners e. Air atomizing burners

Which of the following is NOT an advantage of a factory assembled packaged refrigerant? a) Components are designed to match each other. b) Parts can be ordered and installed separately. c) The unit is more compact. d) Space requirements are minimized. e) The unit is equipped with all the required auxiliary equipment.

Which of the following is NOT an advantage of electrical control systems? Choose one answer. a. Electricity is readily available b. The wiring is relatively simple and easy to install c. Certified electricians must install the control system d. Signals from sensing elements can produce more than one output e. Controller/actuators do not require an air supply

Which of the following is a disadvantage of heat pipe heat recovery systems? Choose one answer. a. Heat pipes have high maintenance requirements b. Heat pipes suffer from cross-contamination of the air streams c. Heat pipes have high power consumption d. A side-by-side duct arrangement is needed e. The necessary pumps and piping are complicated and expensive to install

Which of the following is a flame sensing device? a) thermopile b) heat sensing control c) stack relay d) cut-off valve e) scanner

Which of the following is a programming language? Choose one answer. a. English b. Word c. Desktop publishing d. Latin e. Pascal

Which of the following is a result of an economiser on the refrigeration system? a) an intercooling effect on the compressor b) reduction of the power required for compression in the second stage compressor c) reduction of flash vapour in the evaporator d) increase in the refrigerating capacity of a system e) all of the above

Which of the following is a thermodynamic property of heat? a) entropy b) enthalpy c) density d) volume e) all of the above

Which of the following is a type of outlet in a warm air heating system? a) a grill b) a register c) a ceiling diffuser d) a perforated panel e) all of the above

Which of the following is an advantage of cast-iron sectional boilers a) high resistance to corrosion b) ease of assembly c) possibility of enlarging capacity d) all of the above

Which of the following is an advantage of medium and high pressure HVAC duct systems? Choose one answer. a. Lower operating cost b. Inexpensive control devices c. No need for costly noise suppression devices d. Less costly fabrication and ductwork installation e. Less physical space requirements

Which of the following is an example of a loss of latent heat? i) water evaporating ii) ice melting iii) refrigerant evaporating iv) air cooling a) iv only b) iii only c) i, iii, and iv d) both i and iii e) none of the above

Which of the following is an example of a loss of latent heat? Choose one answer. a. Steam condenses b. Water evaporates c. Ice melts d. Refrigerant evaporates e. Air is cooled

Which of the following is not a cause of freezing in hot water coils? a) failure of the circulating pump b) very low circulating water velocity c) very high circulating water velocity d) failure of the heat source e) poor air venting of the coil

Which of the following is not a centrifugal fan? a) backward inclined fan wheel b) forward curved fan wheel c) the propeller fan d) radial blade fan e) backward inclined airfoil blade fan

Which of the following is not a component of a closed cycle compression refrigeration system? Choose one answer. a. Evaporator b. Receiver c. Compressor d. Absorber e. Condenser

Which of the following is not a component of a mechanical purging system for a lithium bromide absorption chiller? Choose one answer. a. low pressure cut-off b. Purge Pickup tube c. Purge chamber d. Oil trap e. Vacuum Pump

Which of the following is not a correct method of heat regulation? a) Direct modulation of the control valve on the steam or hot water to the heating coil b) Modulating the position of a 3-way mixing valve on the hot/cold water line into the coil c) Modulating the relative positions of face and bypass dampers controlling air flow across the coils d) Modulating the actuators or the steam or water supply in conjunction with the coil bypass damper e) Modulating the valve and the face and the bypass damper 30 degrees out of phase

Which of the following is not a function of terminal air distribution devices? a) provide uniform space temperatures b) provide adequate air motion to prevent local still pockets of air without excess drafts c) maintain comfortable conditions mainly along the ceiling and outside walls within the occupied zone d) distribute the air to the spaces e) control or counteract the effects of conduction, radiation, and convection

Which of the following is not a function of the compressor in refrigeration system? a) draw low pressure refrigerant out of the evaporator b) draw low temperature refrigerant out of the evaporator c) lower the temperature of the refrigerant d) maintain sufficiently low pressure in the evaporator e) raise the pressure of the refrigerant

Which of the following is not a gas-fired infrared heater? Choose one answer. a. Surface combustion heater b. Low temperature catalytic heater c. Quartz tube heater d. Vented heater e. Directly fired

Which of the following is not a physical property of refrigerants? a) Toxicity b) Odour c) Leakage tendency d) Density e) Explosiveness

Which of the following is not a physical property of refrigerants Choose one answer. a. Toxicity b. Odour c. Leakage tendency d. Corrosiveness e. Miscibility

Which of the following is not a recommended step for the procedure in which dry nitrogen is used for a system leak test? a) Remove controls and relief valves which may be damaged by the test pressure. b) Connect the nitrogen cylinder to the system charging valve. c) Close the liquid line shut-off valve. d) Open the liquid line shut-off valve. e) Set the pressure reducing valve for the minimum design pressure of the high side.

Which of the following is not a result of very low humidity? a) Throat and nose membranes drying up b) Static electricity build-up c) Evaporation of moisture on the skin decreases d) At sufficiently high room temperatures people still feel cool e) Wood furniture and floor squeaks and cracks

Which of the following is not a steam user in a meat processing plant? a) edible and inedible rendering plants b) building heating c) sanitation on the killing floor d) steam tracing e) blast freezer

Which of the following is not a step in the seasonal pre-start service? a) clean all cooling and chilled water strainers b) add water treatment chemicals c) turn on energy sources d) check the purge pump e) check the magnetic strainers

Which of the following is not an advantage for a runaround system? a) Installation costs are comparatively low. b) The system is readily adaptable to retrofit applications. c) Piping is not required in the system. d) The exhaust and ventilation streams can be remote. e) Maintenance is relatively simple.

Which of the following is not an advantage of a factory assembled, packaged refrigeration unit? Choose one answer. a. Components are designed to match each other b. The final installation must be according to code c. The unit is equipped with all the required auxiliary equipment d. Space requirements are minimized e. The unit is factory tested in operation

Which of the following is not an element found in a circulating hot water system? a) A fire recoil element b) Air vents c) Heaters d) Back flow valves e) Return Piping

Which of the following is not an installation recommendation for steam traps? a) Base steam trap selection or the pressure difference across the trap and a minimum capacity corresponding to three times the coil condensate rate. b) Locate the steam trap so that its outlet is at least 30 cm (12 in) above the coil return connection. c) Trap each coil separately. d) Install a strainer near the inlet of each trap. e) Drip the steam supply main through a steam trap into the return condensate main.

Which of the following is not found on the low side of an ammonia system? a) Evaporator b) Generator c) Absorber d) Cooling water e) Low pressure ammonia vapour

Which of the following is the compressor responsible for doing? i) Maintains a high pressure in the condenser ii) Maintains a low pressure in the evaporator iii) Raises the pressure of the refrigerant a) i only b) both i and iii c) both ii and iii d) iii only e) i, ii, and iii

Which of the following is the most common type of warm air outlets used in a house? Choose one answer. a. Ceiling diffusers b. Wall diffusers c. Perforated panels d. Wall registers e. Floor registers

Which of the following statements about Non-Circulating hot water systems is true? a) The systems have a return line. b) The systems are used in large residential buildings. c) The systems eliminate hot water stagnation. d) The systems contain a differential fire recoil element. e) The systems force large amounts of water to be wasted before hot water is available in each fixture.

Which of the following statements about a constant pressure system with Pneumatic Tank is false? a) Water entering directly into the pump suction is discharged into pressurized tank. b) This system is primarily used in larger buildings. c) A system controller automatically starts a standby pump in the event of pump failure. d) The system has a pressure regulator to maintain a relatively constant pressure above the water level inside the tank. e) Air must continuously be introduced into the tank.

Which of the following statements about a pressure relief valve in a building hot water system is false? Choose one answer. a. The valve may be installed anywhere in the hot water system close to the heater or tank b. The valve discharge must NOT be directly connected to a drain or vent pipe c. The valve is opened by pressure in the line surpassing a preset pressure set on the spring in the valve d. The valve is automatically closed when the water line pressure drops below the spring pressure setting e. The relief valve may be isolated from the vessel it serves by means of a gate valve, for the purposes of maintenance.

Which of the following statements about a system that circulates warm brine or water back to a chiller tank is true? a) The system is a direct refrigeration system. b) The evaporator in the system is located in direct contact with the material being refrigerated. c) The brine or water is the refrigerant. d) The evaporator cools the brine or water. e) All of the above.

Which of the following statements about adding oil to a system is true? a) Oil is added by charging it into the crankcase. b) Because the crankcase is pressurized it is not possible for air to get in the system when adding oil. c) Oil cannot be added while the compressor is in operation. d) The system must be recharged, purged and re-pressurized after the oil has been added. e) None of the above.

Which of the following statements about central air conditioning systems is false? a) Central systems are used in large buildings. b) All the major equipment in central systems is located in a central mechanical room in the building. c) Air is conditioned in the main mechanical room and distributed by duct work. d) The central system is able to utilize large central equipment with high efficiency and low initial cost. e) Unitary systems are able to control noise and vibration better than central systems

Which of the following statements about coil surfaces is false? a) Air flows across the fins b) Finned coils are more compact than smooth tube coils of the same capacity c) Fins increase the contact surface area between the air stream and the tubes d) All fins must be crimped e) Finned coils are less expensive than smooth coils of the same capacity

Which of the following statements about cooling and de-humidification is false? a) Air washers are used to dehumidify air. b) When air leaves the washer it will be close to 100% relative humidity. c) The spray water carries off the latent heat of condensation of the water vapour in the air. d) Dry bulb temperatures are increased. e) Dewpoint temperatures are lowered.

Which of the following statements about double tube condensers is true? a) It consists of two separate tubes side by side. b) It cannot be used with air cooled condensers. c) Water flow in the inner tube is in the opposite direction of the flow of refrigerant. d) It has the highest efficiency of the water-cooled condensers. e) It is a small condenser for a large capacity system.

Which of the following statements about duct leakage losses is true? Choose one answer. a. The effects of air leakage in supply air ducts are the same as those in return ducts b. For insulated supply air ducts located within the conditioned spaces, determination of air leakage into the conditioned space is difficult and can only be evaluated by judgment c. Leakage inspection can only be done after the duct is covered in insulation d. Losses from bare supply air ducts within the conditioned space have a substantial impact on loss calculations e. Air leakage varies from 40% to 45%

Which of the following statements about effective temperature is true? a) It can be easily determined by using a thermometer. b) Relative humidity does not affect the relative temperature. c) For each combination air velocity remains constant. d) The test involved people all dressed in different amounts of clothing for each combination. e) Charts with metric units cannot be used for making adjustments in SI units

Which of the following statements about evaporator dampers is true? a) These dampers decrease the resistance to the passage of air. b) When the damper is closed the quantity of air passing over the evaporator coils is at a maximum. c) Depending on the damper position the quantity of air passing through the duct varies widely. d) Multi-speed blowers cannot be used in combination with evaporator dampers. e) None of the above.

Which of the following statements about fan coil units makeup air systems is false? a) The units include a disposable filter, fan, and heating/cooling coil. b) Ventilation is provided by a 100% outside air system. c) The air handling unit includes filters, heating coil, cooling coil, humidifier, and supply fan. d) Fan coil units are installed in each room. e) Humidity is controlled by the fan coil units.

Which of the following statements about fan performance curves is false? a) They are plotted from theoretical calculations. b) The curve is a plot of static pressure against air volume delivery. c) The curve is a plot of horse power against air volume delivery. d) The curve is a plot of static efficiency against air volume delivery. e) The curve range is from shutoff to free delivery.

Which of the following statements about flow switches is false? a) They are used on chilled water. b) They are used as lockout switches when flow is insufficient. c) They are operated by the force exerted on a flexible vane immersed in the liquid flowing in the line. d) They can only be used to regulate liquid flow (i.e. not air flow). e) They can be used to close flow indicator circuits

Which of the following statements about footing drains is true? a) Installed to prevent an accumulation of ground water around the building foundations. b) Used to reduce the hydrostatic pressure on the walls below ground level. c) Perforated or porous pipe is used to collect the water near the footings d) The collected water is drained to a remote area or into a sump. e) All of the above

Which of the following statements about high-side pressure and temperature is true? a) The heat flow is from the cooling medium to the hot refrigerant. b) The condensing temperature of the vapour is 15 - 20 degrees C higher than the temperature of the medium used in the condenser. c) The condensation temperature of the refrigerant will be lower if the pressure of the vapourized refrigerant is lowered. d) The condenser functions by taking latent heat from the surrounding air and adding it as sensible heat to the refrigerant. e) None of the above

Which of the following statements about low-side pressure and temperature is false? a) The evaporation temperature of the refrigerant should be 5 - 10 degrees C higher than that of the cooled medium. b) For a given amount of heat transfer an oversize evaporator can be operated at a higher temperature. c) The low side pressure depends on the type of evaporation used. d) The evaporation temperature of the refrigerant will be higher if the evaporator lowers the refrigerant pressure. e) All of the above.

Which of the following statements about manual refrigeration system purgers is false? Choose one answer. a. Gas being vented into the atmosphere must pass through a beaker filled with water b. The receiver and condenser should be purged separately c. Purging rids the system of non-condensable gases d. Purgers cause considerable loss of refrigerant e. They must be operated on a regular schedule

Which of the following statements about multi-zone systems is true? a) The cooling coils are installed in-line b) The dampers are out of phase by 10 degrees c) When the hot deck is fully opened the cold deck is fully closed d) The system cannot operate a humidifier e) All of the above

Which of the following statements about pressure gauges is true? a) They indicate pressures and corresponding temperatures in a system. b) Dials on refrigeration pressure gauges do not indicate saturation temperature. c) Only one pressure gage is required for each system. d) The pressure gage will not work if the system is equipped with pulsation dampeners. e) None of the above.

Which of the following statements about pressure relief valves is false? a) The valve may be installed anywhere in the hot water system close to the heater or tank. b) The valve must be directly connected to a drain or vent pipe. c) The valve is opened by pressure in the line surpassing a preset pressure set on the spring in the valve. d) The valve is automatically closed when the water line pressure drops below the spring pressure setting. e) None of the above.

Which of the following statements about pressure stats is false? a) The control is connected to the suction line of the compressor. b) The control consists of a switch actuated through a linkage arrangement connected to a bellows or diaphragm. c) A pressure-stat can be used in conjunction with an automatic expansion valve. d) When the pressure drops to the minimum allowable the switch acts opposite to a thermostat and opens. e) A pressure-stat cannot be used with a

Which of the following statements about run around heat recovery systems is false? Choose one answer. a. Installation costs are comparatively low b. The system is readily adaptable to retrofit applications c. Piping is not required in the system d. The exhaust and ventilation streams can be remote e. Maintenance is relatively simple

Which of the following statements about steam distributing coils is true? a) The coils never freeze b) The coils distribute steam evenly over the entire coil c) The coils are used when steam cannot be throttled d) The coils cannot be used where freezing air temperatures are frequently encountered over the coil e) The coils can only have same end connections

Which of the following statements about strainers is false? a) The strainer is installed in the suction line. b) Piping must be disconnected to clean the strainer. c) Hermetic type compressors are equipped with a built-in suction strainer. d) Strainers typically consist of a fine mesh screen basket. e) Strainers prevent foreign particles from damaging compressor valves.

Which of the following statements about the economizers is false? a) It controls the flow of liquid refrigerant from the low pressure evaporator to the high pressure condenser. b) It is composed of two chambers. c) The upper float chamber is connected to the bottom of the condenser. d) The economizer float chamber is connected via the motor to the second stage inlet of the compressor. e) Liquid refrigerant levels in each chamber are controlled by a float operated valve in the evaporator

Which of the following statements about the evaporator bypass dampers in a refrigeration system is true? Choose one answer. a. They decrease the resistance to the passage of air when they close b. When the face damper is closed, the quantity of air passing over the evaporator coils is at a maximum c. The quantity of air passing through the duct depends on the damper position d. Multi-speed blowers cannot be used in combination with face and bypass dampers e. Actuators are required to provide damper movement

Which of the following statements about the shell and tube evaporator type is false? a) It is also known as a chiller. b) This type of evaporator cools mainly liquids. c) The refrigerant is circulating in the shell in the flooded operation. d) Refrigerant vapour is drawn out of the evaporator by the compressor. e) The liquid to be cooled circulates through the tubes in the direct-expansion operation.

Which of the following statements about the shell and tube refrigeration evaporator is false? Choose one answer. a. It is also known as a chiller b. The brine circulates through the tubes in a direct-expansion chiller c. The refrigerant is contained in the shell, and surrounds the tubes, in the flooded chiller d. Refrigerant vapour is drawn out of the evaporator by the compressor e. This type of evaporator cools mainly liquids

Which of the following statements about two-pipe arrangements is false? a) The arrangement is the least costly. b) Piping is connected to the boiler during winter. c) Piping is connected to the chiller during summer. d) The arrangement is made up of a supply and return connection to a single coil. e) The system can heat and cool at the same time.

Which of the following statements about vacuum breakers is false? a) They are used to prevent freeze-ups caused by negative pressure in the coil. b) The vacuum breaker must be installed before the control valve and as near as possible to the outlet connection of the coil. c) Check valves used as vacuum breakers may be left open to the atmosphere. d) Check valves used as vacuum breakers may be connected to the return header. e) Vacuum breakers are essential for satisfactory

Which of the following statements about water coils is false? a) Coils should be hooked up in a counter flow arrangement. b) Coils need to be able to vent air. c) Adequate air velocity over the finned surface must be maintained. d) Circuiting should minimize the performance of the water flow versus the pressure drop through the coil. e) The bottom connection should always be the water inlet

Which of the following statements is NOT true for an induction HVAC system? Choose one answer. a. The ratio of secondary air to primary air flow is typically 4 to 1 b. The room thermostat modulates the flow of chilled or hot water to the induction unit coil c. The primary air can be heated proportionally to the outside air temperature d. The primary high-pressure air is supplied at a constant 12.5°C e. With a two-pipe system temperature control is difficult during seasonal changes

Which of the following statements is true? a) Branch line connections to the waste stack should be connected at an angle of more than 45 degrees. b) The stack vent prevents sewer gas from being vented through the roof. c) The stack vent and loop vents allow equalization of pressure in the system. d) In multi-story buildings one stack is used for venting and waste disposal. e) Most buildings have several waste and soil stacks with each stack providing drainage for all the sections of the building.

Which of the following steam traps are preferred for use with steam coils operating at low and medium steam pressure? a) inverted bucket b) dynamic c) F & T trap (float and thermostatic) d) thermostatic only e) none of the above

Which of the following steps is not a step in the startup of a reciprocating or rotary compressor refrigerating system? a) Check oil level in the compressor, it should be at or above the center of the sight glass. b) Check the setting of high and low pressure cutout switches. c) Open all shutoff valves in the system except bypass valves used elsewhere in the system. d) Valves in lines connecting suction gauges should be closed. e) Check oil level in the compressor; it should be below the center of the sight glass.

Which of the following steps is not part of the start-up procedure of a centrifugal compressor refrigerating system? Choose one answer. a. Operate the oil pump for at least ten (10) minutes before starting the compressor b. Open the stop valves in the chilled water system c. Open the main circuit breakers d. Open the makeup water valve e. Check the refrigerant levels

Which of the following units would the pressure gauge on a steam boiler likely use? Choose one answer. a. Pascals b. Pascals per square metre c. Kilograms per square centimeter d. Kilograms per hour e. Kilopascals

Which of the following would be the best choice for a powerhouse control-room installation? Choose one answer. a. A minicomputer b. A mainframe computer c. A microcomputer d. A netbook computer e. A laptop computer

Which of the statements about automatic expansion valves is false? a) The valve maintains constant pressure in the evaporator during compressor operation regardless of the load. b) When the compressor stops the valve automatically shuts off. c) A spring exerting a downward force on the diaphragm tends to open the valve. d) The spring force is countered by evaporator pressure acting downward against the diaphragm which closes the valve. e) The control may be used with multiple cooling coils connected to the same compressor.

Which of these statements about hydronic heat pumps is true? Choose one answer. a. The units discharge heat to the water piping during the cooling mode b. The piping must be insulated c. The water temperature is below the dewpoint of the room air d. Condensate drains from each unit are not necessary e. The refrigeration system is cooled by Freon, such as R-12

Which one is NOT an advantage of Pneumatic Signals? a. They are simple and provide trouble free operation b. They can transmit over long distances c. Less expensive than electronic instruments d. Safe in operation

Which one is NOT an disadvantage of Pneumatic Signals? a. Always lag or delay in the signal b. Friction causes a decrease in the value of the signal c. More expensive than electronic instruments d. Cost of tubing is greater than electrical wiring e. Ensuring a clean, dry air supply may be costly.

Which one is NOT true about the shell and tube condenser? a. High maintenance cost b. High cooling efficiency c. Cleaned easily d. Used in medium to large air conditioning installations

Which one of the following air cleaning devices can be used for the removal of gases and vapour? Choose one answer. a. Dry filters b. Air washers c. Electronic air cleaners d. Charcoal absorbers e. Air sterilizers

Which one of the following methods is a method of ensuring uniform steam distribution in steam coils? Choose one answer. a. Installation of distributing plates within the steam header b. Controlling the face velocity of the air flowing over coils, using face and bypass dampers c. Half-serpentine coil circuitry d. Parallel flow coils e. Double-serpentine coil circuitry

Which one of the following methods is not a method of ensuring uniform steam distribution in steam coils? a) installation of distributing plates within the steam header b) "steam distributing" coils c) installation of individual orifices into the supply end of each tube d) once called "non-freeze coils" e) controlling the face velocity of the air flowing over coils

Which one of the following should a ideal refrigerant should NOT have? a. A low boiling point at atmospheric pressure b. A high latent heat capacity: that is, it should require a large amount of heat to convert it from a liquid to a gas after its boiling point has been reached c. A fairly low condensing pressure d. An offensive odour e. A nonpoisonous nature f. A noncorrosive action on metals g. A nonflammable and nonexplosive nature when mixed with air h. A reasonable price

Which part is not a part of a reciprocating compressor? a. Inlet vane b. Crankshaft c. Connecting rod d. Piston

Which turbine uses a condenser? a) back pressure turbine b) a turbine exhausting to a vacuum c) a bleeder turbine exhausting at atmospheric pressure d) a non-condensing extraction turbine e) a turbine exhausting to atmosphere

Which type of grease is the cheapest and most commonly used? a) lithium base b) teflon base c) paraffin base d) calcium base e) silicon base

Who is responsible for providing safe working conditions in the plant? a) Management b) The Boilers Branch c) Worker's Compensation (Occupational Health and Safety) d) The ASME code e) The union

Who is responsible for providing safe working conditions in the plant? Choose one answer. a. Management b. The Boilers Branch c. Worker's Compensation Occupational Health and Safety d. The ASME Code e. The Union

With automatic fuel fired boiler programmed control the normal firing period begins approximately a) 44 seconds after FD fan starts b) 75 seconds after FD fan starts c) 60 seconds after FD fan starts d) 10 seconds after pilot extinguishes e) 47 seconds after pre-purge

With counte rflow arrangement of air and water a) the water supply connection is on the same side as the entering air b) it decreases the heat transfer efficiency c) the water supply connection is on the same side as the leaving air d) the water return connection is on the same side as the leaving air e) the heat transfer efficiency is the same as with parallel arrangement of air and water

With regard to a refrigeration system pressurestat, which of the following statements is false? Choose one answer. a. The control is connected to the suction line of the compressor b. The control consists of a switch actuated through a linkage arrangement connected to a bellows or diaphragm c. A pressurestat can be used in conjunction with an automatic expansion valve d. When the pressure drops to the minimum allowable the switch acts opposite to a thermostat and opens e. A pressurestat cannot be used with a capillary tube

With regard to economizers installed on packaged air-conditioning chillers, which of the following statements is false? Choose one answer. a. Economizers control the flow of liquid refrigerant from the evaporator to the condenser b. Liquid refrigerant levels in each chamber are controlled by float operated, valves c. The upper float chamber is connected to the bottom of the condenser d. The economizer float chamber is connected via the motor to the second stage inlet of the compressor e. It is composed of two chambers

With regard to hot water heat coil installation, which of the following is not an important factor in prevention of coil freeze-up? Choose one answer. a. Air must be continually vented from the coil, before and during service b. The air velocity should exceed 10 m/s c. The water temperature should be maintained at a reasonably high pre-set temperature d. The water velocity should exceed 0.9 m/s e. A constant flow of water should be fed to the coil

With regard to oil leaving each heater pass, of particular importance is the a) pressure b) volume c) velocity d) temperature e) flash point

With regard to the condenser in a refrigeration system, which of the following statements is true? Choose one answer. a. In the condenser, heat transfers from the cooling medium to the refrigerant b. The condensing temperature of the refrigerant vapour is 15°-20°C higher than the temperature of the cooling medium c. The condensing temperature of the refrigerant will be lower if the pressure of the refrigerant is increased d. The condenser transfers latent heat from the cooling medium and adds it as sensible heat to the refrigerant e. The refrigerant absorbs latent heat of condensation from the cooling medium.

With regard to the high pressure side, the maximum setting for a pressure limiting device on a refrigeration system shall not exceed the pressure relief device set-point by: Choose one answer. a. 100% b. 75% c. 90% d. 80% e. 50%

With regard to their application in refrigeration systems, which of the following statements about flow switches is false? Choose one answer. a. They are used on chilled water systems b. They are used as shutdowns or permissives when flow is insufficient c. They are operated by the force exerted on a flexible vane immersed in the fluid flowing in the line d. They can only be used to regulate liquid flow, not air flow e. They can be used to close flow indicator circuits

With respect to steam trap installations, which of the following is NOT advisable? Choose one answer. a. Choose a steam trap based on the pressure difference across the trap, and a minimum capacity corresponding to three times the coil condensate rate b. Locate the steam trap so that its outlet is at least 30 cm above the coil condensate outlet c. Each steam coil requires its own, dedicated steam trap. d. Drip the steam supply main through a steam trap into the return condensate main e. Install a strainer near the inlet of each trap

With single element feed water control the level transmitter output is a) received by a final element b) proportional to drum level c) sent to a selector station d) constant regardless of level e) a function of steam flow

With single element feedwater control the level transmitter output is a) received by a final element b) proportional to drum level c) sent to a selector station d) constant regardless of level e) a function of steam flow

With the fusible plug type of temperature relief device, the fusible plug will melt at __________ degrees Celsius and allow hot water to escape. a) 131 b) 121 c) 101.3 d) 100 e) 99

Wood pulp production by chemical means, requires the removal of_______, in order to obtain the cellulosic fibre. a) pentosan b) lignin c) sugar d) hemicellulose e) sodium sulphite

You are replacing the cooling tower fan motor bearings because a) the motor was running single phase b) winding in the motor were faulty c) a noise which sounded like a bad bearing was heard d) the rotor was rubbing the stator e) the gear reducer pinion shaft was misaligned

You discover that your feed water pump is not delivering sufficient water. A possible cause is a) the impeller is plugged b) the suction lift is too low c) the discharge head is not high enough d) there is too much water in the pump e) the foot valve is fully open

___ are often used to aid the return of condensate through the return piping of large complexes. Choose one answer. a. Boiler feed pumps b. Vacuum injectors c. Pressure controls d. Vacuum pumps e. Vacuum breakers

____ are used on motors and generators to set up a magnetic field. a) Insulated wires b) Transformers c) Carbon rings d) Mica strips e) Field poles

____ is an electromotive force. a) Amperage b) The ohm c) Power d) The watt e) The volt

____________ are required to prevent oil from spreading beyond the confines of a heater in the event of a ruptured tube. a) Moats b) Dikes c) Tunnels d) Rails e) By-pass pipes

_____________ current flow is from positive to negative. a) Reversed b) Generated c) Static d) Conventional e) Electron

a A CRT or LCD display trend recorder Choose one answer. a. Often has a number of dedicated displays b. Is equipped with graph limiters c. Does not have print out capabilities d. Displays only a single trend at a time e. Is independent of the transmitter signal

c The top of a ladder should extend approximately _____ above the level of the upper landing to which it provides access. Choose one answer. a. 3 rungs b. 0.5 m c. 1 m d. 0.2 m e. 1 rung

flame rod: Choose one answer. a. Is used in combination with a photocell b. Is used only for oil fired burners c. Forms an electric circuit with the rod, flame and burner d. Senses the temperature of the flame e. Develops a high resistance in the presence of a fl

n a "direct" lighting systems all or most of the luminous intensity is: Choose one answer. a. Directed up at the ceiling b. Reflected off the walls c. Directed down toward the work place d. Reflected off the ceiling e. Task lighting

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