PE Chapter 125-144

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Air venting, in an air conditioning system, is required for which of the following reasons? a) to assure adequate water distribution in the coils and supply/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

An eye made by using a Crosby clip will have a strength factor of a) 80% b) 50% c) 95% d) 75% e) 90%

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 common lifting device used in a plant is a block and tackle; a block and tackle is a combination of: a) chains & come-along b) ropes & pulleys c) eye bolts & wire rope d) slings & rigging e) hooks & shackles

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 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

Mechanical steel fasteners that are commonly used in the automotive industry and on various plant machinery are classed as a) carriage bolts b) machine bolts c) hexagon bolts d) whitworth bolts e) self tapping

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

A system consists of two finned tube heat exchangers. 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 ductwork handling exhaust air

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

Air conditioning heat recovery methods include: 1. the runaround system 2. the solar collector system 3. the tempered intake system 4. the thermal wheel system a) 1,2 b) 3,4 c) 1,4 d) 2,3 e) 1,2,3,4

Air is approximately what composition by volume? a) 79% N² and 21% CO² b) 79% O² and 21% N² c) 79% N² and 21% O² d) 79% CO² and 21% O² e) 79% H² and 21% H²O vapour

Air is made up of approximately: a) 79 % N2 and 21% CO2 b) 79 % O2 and 21 % N2 c) 79 % N2 and 21 % O2 d) 79 % CO2 and 21 % O2 e) 79 % H2 and 21 % H2O vapour

Compatibility of oils is determined by a) analysis b) reading the labels c) electrolysis d) diagnosis e) smelling a sample

Smelt liquor used in the Kraft pulp process is a mixture of: a) sodium lignite b) soda solids c) sodium sulfite d) sodium hydroxide e) molten smelt

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

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

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

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

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

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 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 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: 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 only

A relatively new and safer chemical used in boiler cleaning and treatment is a) chelates b) trisodium phosphate c) sodium hydroxide d) caustic soda e) hydrazine

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 moistrue present in a specific amount of air at that absolute temperature e) a specific amount of air saturated with moisture

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

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

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

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

Enthalpy values are found on a psychrometric chart by a) plotting a line through the required point on the chart parallel to the lines of the two enthalpy scales, one on the left side and the other on the right side of chart b) plotting a horizontal line from one of the enthalpy scales c) plotting a vertical line from one of the enthalpy scales d) simply reading values on one of the enthalpy scales e) plotting a line from one of the enthalpy scales

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

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

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

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

The flow through an oil heater is controlled a) automatically b) manually c) proportionally d) generally e) by pressure changes

The minimum mounting height for a louvre in most snowfall area is ______. a) 1.0 m b) 1.5 m c) 2.0 m d) 2.5 m e) 3.0 m

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 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 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

This type of unitary air conditioning system has two compartments, a supply plenum and a condenser compartment. a) a window air conditioner b) a packaged air conditioner c) a unit ventilator d) a rooftop unit e) a combined air conditioner

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 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

When used on a heat pipe heat recovery system, face and bypass damper control can be used to do which of the following? 1. prevent frost formation 2. limit heat recovery 3. dehumidify 4. provide low start up load a) 1,2 b) 3,4 c) 1,2,3 d) 2,3,4 e) 1,2,3,4

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

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 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 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 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.

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

"Slips and locks" refers to _________ a) a means of isolating motors b) special seams used to fasten ducts together c) a system to prevent injuries d) a way to block a doorway e) a type of chain used in industry

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 gas fired hot oil heater has skin thermocouples to measure outside tube temperature. A gradual increase in temperature on all thermocouples is an indication of: a) soot on the tubes b) the tubes coking off c) not enough excess air d) a decrease in oil flow e) faulty thermocouples

A steam heating boiler that is to be shut down for six months during the summer, should be a) left with the water at normal working level and pressurized with air to 50 kPa b) drained, thoroughly dried out, quick lime placed inside and closed up c) A completely water filled boiler with the vent open to atmosphere d) drained, thoroughly dried out, quick lime placed inside and left open e) left with the water at normal working level but opened up to atmosphere

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 tube beading tool a) is used on watertube boilers b) is used on firetube 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 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

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 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 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

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

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

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

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

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

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

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

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

Inlet steam pressure to a heating coil should not be less than what pressure? a) 5 kPa b) 34 kPa c) 16 kPa d) 42 kPa e) 50% of control valve discharge pressure

Installation of a thermal wheel requires: a) minimal space b) that the ducts be adjacent and parallel c) pre-conditioning cols in addition to the thermal wheel itself d) louvers or deflectors to prevent carry-over e) a pump, piping and a circulating fluid

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

Low oil flow shutdowns (FSDL) are usually installed a) on the inlet line of the oil heater b) on the outlet line of the oil heater c) on the pump suction line d) on the surge tank line e) on the pump discharge line

One of the best methods to reduce power consumption of a fan motor is the __________. a) fluid drive b) variable speed motor control c) outlet damper control d) variable inlet vane control e) v-belt drive

One of the best ways to achieve volume control in an air system, from a sound level standpoint, is the __________. a) outlet damper control b) variable speed motor control c) fluid drive d) direct drive e) variable inlet vane control

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

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

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

The Hartford Loop prevents the water in the boiler from: a) exceeding the highest safe level b) dropping below a safe level c) flowing out through the steam main d) exceeding the maximum temperature e) contamination by impurities in the returning condensate

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 flow arrangement best suited for hot water coils is a) the counterflow 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 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 most popular acid for boiler cleaning is a) sulphuric b) hydrochloric c) phosphoric d) nitric e) chelate

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 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

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

Using the psychrometric chart, find the enthalpy if the dry-bulb temperature is 25 degrees C and the wet-bulb temperature is 20 degrees C. a) 55 kJ/kg b) 57 kJ/kg c) 60 kJ/kg d) 50 kJ/kg e) 65 kJ/kg

Using the psychrometric chart, find the relative humidity if the dry-bulb temperature is 20 degrees Celsius and the wet-bulb temperature is 15 degrees Celsius. a) 50% b) 58% c) 52% d) 68% e) 62%

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 Atomizing humidifiers

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

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

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 component of a runaround heat recovery system? a) a recovery coil b) a thermal wheel c) a pre-conditioning coil d) a pump e) an expansion tank

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 functioning of the steam trap.

A new boiler should be flushed and internally inspected after _________ months of operation: a) one b) twelve c) three d) six e) two

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 single pole scaffold a) is free standing from the building b) places no load on the building c) is partially supported by the building d) is always made of metal e) must be made of pipe

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

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

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

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

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

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

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

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 check the trueness of a flat surface, one would use a a) Vernier calliper b) hermaphrodite divider c) surface plate d) layout bench e) machinists square

Lead sulfide cells operate when __________ is present: a) flue gas b) ultra-violet light c) infrared d) no light e) heat

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

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 combined psychrometric process of cooling and humidification is also known as _________. a) enthalpy cooling b) relative humidification c) evaporative cooling d) effective temperature humidification e) humidification

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 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 final step in replacing a firetube 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 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 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 purpose of the fluid catalytic cracking unit (F.C.C.U.) in an oil refinery is a) to receive the crude oil and recover more gas oils by further distilling under high temperature and low pressure b) to remove the propane, butane, and light ends from the crude oil c) to cause the heavy hydrocarbons to be transformed into lighter hydrocarbons d) to remove the sulphur and nitrogen from the diesel e) to remove the hydrogen sulphide and nitrogen from the naphtha

The specific volume of air is a) the volume of 1 kg of air at atmospheric pressure expressed in cubic centimetres b) the volume of 1 gram of air at atmospheric pressure expressed in cubic metres c) the volume of 1 kg of air at atmospheric pressure expressed in cubic metres 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 top of a ladder should extend approximately __________ above the level of the upper landing to which it provides access. a) 2 metres b) 0.5 metres c) 0.9 metres d) 0.2 metres e) 0.3 metres

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

The wet-bulb temperature scale is read on a psychometric 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

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 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 oversized coil e) Two-position damper motor

Using the psychrometric chart, find the dew point temperature if the dry-bulb temperature is 20 degrees C and the wet-bulb temperature is 15 degrees C. a) 20 degrees C b) 14 degrees C c) 11.5 degrees C d) 10 degrees C e) 16 degrees C

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%

Using the psychrometric chart, find the specific humidity if the dry-bulb temperature is 25 degrees C and the wet-bulb temperature is 20 degrees C. a) 0.12 kg of water vapour per kg of dry air b) 0.012 kg of water vapour per kg of dry air c) 0.0125 kg of water vapour per kg of dry air d) 0.013 kg of water vapour per kg of dry air e) 0.0115 kg of water vapour per kg of dry air

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 does it mean when it is said that the air temperature in an air conditioning system has been "tempered"? a) the temperature has been raised b) the temperature has been lowered c) the temperature has been adjusted to within the required range by the addition of heat or cold d) the air temperature has been adjusted so as to approach its dew point e) the temperature has been held at the desired level in all possible conditions

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 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

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

With a counterflow 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 counterflow 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

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 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 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 ductwork operating at less than 10 m/s is said to be a _________duct system. a) high velocity b) medium pressure c) medium velocity d) low pressure e) high pressure

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 fan is referred to as non-overloading when a) the free air delivery is at minimum b) the static pressure remains low c) velocity pressure is at maximum d) the power curve falls at free air delivery e) the static efficiency is low

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 oil pump suction strainer should be inspected and cleaned after how long, following initial circulation of oil through the system? a) 5 - 6 hours b) 1 - 2 hours c) 6 - 8 hours d) 3 - 4 hours e) 4 - 5 hours

A lean amine solution contains little: a) water b) amine c) nitrogen d) H2S e) hydrocarbon

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

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 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 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 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 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 type of fan, which is well suited for air handling units which require two or more fans on the same shaft and low rotation speed is the _________. a) backward inclined airfoil blades b) straight radial blade c) tube axial fan d) forward curve fan e) vane axial fan

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

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

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

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

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

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

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

Heat gains from the sun change and depend on: 1. The type of house 2. The latitude 3. The season 4. The time of day a) 1,2 b) 3,4 c) 1,2,3 d) 2,3,4 e) 1,2,3,4

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

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

Power consumption reduction of a fan motor can be best achieved by __________. a) direct drive b) forward curved fan c) v-belt drive d) volume control e) static pressure control

Psychrometry is a) the study of the behaviour of people b) the study of the behaviour of air c) the study of the behaviour of water vapour d) the study of the behaviour of mixtures of air and water vapour e) the study of the behaviour of ideal gases

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

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 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 likely cause of a fire in a hot oil system is: a) pump seal leak b) exchanger leak c) wrong gasket material d) furnace tube rupture e) failure of the blanket gas system

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 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

Using the psychrometric chart, find the specific humidity if the dry-bulb temperature is 20 degrees C and the wet-bulb temperature is 15 degrees C. a) 0.009 kg of water vapour per kg of dry air b) 0.008 kg of water vapour per kg of dry air c) 0.010 kg of water vapour per kg of dry air d) 0.0085 kg of water vapour per kg of dry air e) 0.0085 kg of dry air per kg of water vapour

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

Which of the following statements is true regarding a heating coil fitted with face and bypass dampers? a) temperature control is achieved by the use of the steam or hot water valve b) the face and bypass dampers are two position dampers c) the steam supply to the coil is controlled by the outside air thermostat d) the coil temperature is held constant e) when the bypass damper is open, steam supply is shut off

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

The two types of wood pulping processes are the mechanical and the a) thermal b) industrial c) hydraulic d) triple train e) chemical

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 H.P. a) i and iv b) i and iii c) i and iv d) iii only e) i, ii, iii, and iv

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

This type of fan drive system is normally used on systems where the resistance can be determined accurately. a) fluid drive b) variable speed motor control c) v-belt drive d) variable inlet van control e) direct drive

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

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 upset in a plant process is called a/an: a) disturbance b) agitation c) perturbation d) malfunction e) disorder

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 "turbined"

Building a high velocity terminal reheat central air conditioning system allows for what? a) The use of smaller ducts b) The use of smaller fans c) The use of a variable air fan d) Terminal boxes to be located directly in the conditioned space e) The use of a rooftop unit for cooling

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

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 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

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

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 oversized coil e) are minimized by using an oversized control valve

If 5.0 cubic metres/second of air enters a heating coil at 20 degrees C dry-bulb and 15 degrees C wet-bulb, and leaves the heating coil at 30 degrees C dry-bulb, what is the mass of air flowing? a) 5.94 kg/sec b) 6.84 kg/sec c) 5.0 kg/sec d) 6.2 kg/sec e) 5.4 kg/sec

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

It is important to drain an hot oil heater prior to attempting a radiographic 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

One of the following is not a centrifugal fan a) the propeller fan b) backward inclined fan wheel c) backward inclined airfoil blade fan d) forward curved fan wheel e) radial blade fan

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

Paper is produced from which of the following constituents of trees: a) cellulose b) lignin c) hemicelluloses d) pectin's e) pentosans

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

Relative 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

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 plotted on a psychrometric chart a) on lines curved upwards from the lower left to the right side of the chart b) along the horizontal axis on the bottom of the chart c) on vertical lines and read along the horizontal scale at bottom of the chart d) on horizontal lines and read along the left side scale e) along the saturation line and plotted along horizontal lines

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

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

Stripping steam in a refinery a) is directly injected in a tower to remove a light product b) is low pressure steam from a waste heat boiler c) is used for heat tracing d) is steam generated from process water e) is used in an exchanger to heat a process for distillation

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

The clove hitch is used for attaching a rope to pull a) at right angles b) vertically c) horizontally d) straight e) upwards

The contaminants in a natural gas may include a) hydrogen sulphide b) pentane c) hexane d) methane e) oxygen

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 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 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 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 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 main advantages of a low pressure duct system is the: a) relative quietness of the air movement b) higher operating costs c) special control devices d) noise suppression devices required e) careful fabrication and installation of the ductwork

The main disadvantage of a sawmill gangsaw 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 function of air distribution devices is to introduce supply air into the conditioned space. This is accomplished by using which of the following methods. 1. diffusion 2. induction 3. entrainment 4. aspiration a) 1,2,3,4 b) 1,2,3 c) 2,3,4 d) 1,3,4 e) 1,2,4

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 multizone system e) a unit ventilator

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, counterflow, and serpentine

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 outside temperature 18 - 25 degrees C is saturated (Air at -25 degrees C holds a maximum of 0.0005 kg of moisture/kg of water). This air is drawn into the building and heated to 21 degrees C (air at 21 degrees C holds a maximum of 0.015 kg of moisture/kg of water). What is the relative humidity of the air inside? a) 3.3% b) 0.015% c) 0.5% d) 10.6% e) 4.5%

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 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 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 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

To obtain full rated capacity of water coils what should be done? a) Connect the water supply for counterflow 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 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

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

Using the psychrometric chart, find the dew point temperature if the dry-bulb temperature is 25 degrees C and the wet-bulb temperature is 20 degrees C. a) 17.5 degrees C b) 14 degrees C c) 20 degrees C d) 16 degrees C e) 19 degrees C

Using the psychrometric chart, find the relative humidity if the dry-bulb temperature is 25 degrees C and the wet-bulb temperature is 20 degrees C. a) 62% b) 70% c) 52% d) 72% e) 75%

Using the psychrometric chart, find the specific volume if the dry-bulb temperature is 20 degrees C and the wet-bulb temperature is 15 degrees C. a) 0.859 cubic metres / kg b) 0.842 cubic metres / kg c) 0.90 cubic metres / kg d) 0.80 cubic metres / kg e) 0.87 cubic metres / kg

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

What is the difference between "thermal conductance" and "thermal conductivity"? a) Thermal conductance deals with a composite material. Thermal conductivity deals with a uniform type or material b) Thermal conductivity uses SI units; thermal conductance uses Imperial units. c) Thermal conductivity deals with heat given off by a single electrical device. Thermal conductance deals with the heat given off by all electrical devices in a building. d) There is no difference. e) Thermal conductivity deals with heat gain. Thermal conductance deals with heat loss.

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

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

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 petroleum oils break down or crack due to high temperature the products formed are insoluble and a) more viscous b) less viscous c) equally as viscous d) not viscous e) unchanged

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) superheated

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 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 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 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 measure of comfort which involves the combined effects of the dry-bulb temperature, relative humidity and air movement is defined as a) comfort zone b) effective temperature c) comfort condition d) shock effect e) psychrometric climate

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

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

Belt guards are required on _________ a) variable speed motor controls b) v-belt drives c) direct drives d) outlet damper controls e) fluid drives

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

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

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

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

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

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

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

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

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

How is the electric heating element in an industrial pan type humidifier protected from overheating? a) by a minimum flow switch b) by a low water cutoff switch c) by a thermal resistive switch d) by an overpressure limit switch e) by a cooling spray

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 compartments are window air conditioners divided into? a) 1 b) 2 c) 3 d) 4 e) 5

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

If 5.0 cubic metres per second of air enters a heating coil at 20 degrees C dry-bulb and 15 degrees C wet bulb, and leaves the heating coil at 30 degrees C dry bulb, what is the heating capacity of the coil? a) 52 kW b) 59.4 kW c) 42 kW d) 65.2 kW e) 51.7 kW

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 an induction type combined air conditioning system, where is the air filtered? a) in the induction unit b) in the make-up unit c) in the low velocity ducting d) in the attenuator e) in the room diffusers

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

Sharing and transferring information between computers is termed: a) Plotting b) Networking c) Number crunching d) Multiplexing e) Analogging

Short radius elbows should be provided with a) stiffeners b) turning vanes c) mitre elbows d) positive lock dampers e) flexible connections

Specific humidity scale on a psychrometric chart is a) along the horizontal axis at the bottom of the chart b) along the vertical axis of the chart and right side of chart c) along the horizontal axis at the top of the chart d) along the left saturation line e) along the vertical axis of the chart and left side of chart

Steam coils with long tube lengths a) have the greatest freezing problems at extremely low temperatures such as -35° C b) have the greatest freezing problems at temperatures of about -2 to -1° 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

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

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 breaking down on long chain hydrocarbon molecules to smaller more valuable ones is called: a) hydro treating b) cracking c) stabilization d) thermal degradation e) dehydration

The condenser section of a window air conditioner: a) is larger than the supply plenum b) is exposed to outside air c) has an automatically controlled damper to vary the amount of outside air introduced into the room d) has a water cooling arrangement e) has heat recovery section for maximum efficiency

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 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 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 recirculation c) 100% outdoor air circulation d) mixed air circulation e) blended circulation

The output pressure signal of a transmitter relay is usually: a) fed to a final element of a loop b) direct and proportional to nozzle pressure c) inversely proportional to nozzle pressure d) a function of supply pressure e) the same as the primary element output signal

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 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 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 naphtha hydrotreater in an oil refinery is a) to remove the hydrogen sulphide and nitrogen from the diesel b) to remove the 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 the water from the crude oil e) to remove the diesel from the naphtha

The purpose of the naphtha hydrotreater in an oil refinery is: a) to remove the hydrogen sulphide and nitrogen from the diesel b) to remove the sulphur and nitrogen compounds from the naphtha c) to cause the heavy hydrocarbons to be transformed into lighter hydrocarbons d) to remove the diesel from the naphtha e) to remove the water from the crude oil

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

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

What functions do the mixing boxes in a dual duct air conditioning system perform? 1. humidification 2. blending air temperatures 3. maintain constant air flow 4. filtration a) 1,2 b) 2,3 c) 3,4 d) 1,2,3 e) 2,3,4

What is a drop in humidity in a controlled space sensed by? a) a pressurestat b) a humidistat c) thermostat d) a water sensor e) the humidifier

What is the name of the air conditioning system that has all the major equipment located in one mechanical room? a) packaged system b) central system c) combined system d) multi-zone system e) dual duct system

What type of unitary air conditioning system do the following statements describe? 1) it may be installed in a false ceiling 2) it has a direct expansion coil 3) it may be fitted with auxiliary heating coils 4) single zone in operation a) window air conditioner b) packaged air conditioner c) unit ventilator d) rooftop unit e) combined unit

When an automatic unattended boiler starts up, the program timer will first: a) energize the main gas valve b) start the force draft fan c) energize the ignition transformer and pilot gas solenoid valve d) energize the main feed water valve e) start the post purge period

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 taking wire rope off a spool the spool should always be rotated, removing the rope from the side may result in: a) knotting b) kinking c) friction d) braiding e) hoisting

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

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 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 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

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

____________ 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

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 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

Ammonia is removed from a hydrotreater by washing the oil with _________. a) amine b) naphtha c) Water d) steam e) hydrazine

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 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

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

Dehumidification 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

Dehumidification 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

Disadvantages of a thermal wheel heat recovery include: 1. a large space is required 2. perfect sealing is impossible 3. the ducts must be side-by-side 4. the recovery rate is relatively low a) 1,2 b) 3,4 c) 1,2,3 d) 2,3,4 e) 1,2,3,4

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

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

If 5.0 cubic metres per second of air enters a heating coil at 20 degrees C dry-bulb and 15 degrees C wet bulb, and leaves the heating coil at 30 degrees C dry bulb, what is the volume of air leaving the coil? a) 5.94 cubic metres per second b) 5.0 cubic metres per second c) 5.17 cubic metres per second d) 4.2 cubic metres per second e) 5.72 cubic metres per second

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

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 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 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 preheater coils should be installed d) Damper must be heated e) Preheat coil temperature should be increased

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

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

Natural ropes are made of a) nylon b) polyethylene c) manila d) dacron e) polyvinyl chloride

One of the following is not a property of a good heat transfer oil : a) high specific heat b) low pour point c) good load bearing properties d) high flash point e) non corrosive

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

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 centre of gravity c) held in a shackle d) used only with a come-along e) fastened with a Crosby clip

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

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%

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.

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

Specific humidity is a) the ratio of the actual amount of water vapour present in the air to the amount of water vapour the air can contain when it is saturated b) the same as specific volume of humid air c) the actual moisture content of air expressed as kg of moisture per kg of dry air d) the ratio of dry air to moisture e) the moisture content of air of 100% relative humidity

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 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

Supply air duct leakage loss calculations include a) 20% leakage loss when all 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 all the supply air duct is outside the conditioned space d) 5% leakage loss when all 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

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 typical fired heater model is the a) down-draft b) dual-draft c) up-draft d) balanced-draft e) induced-draft

This type of unitary air conditioning system incorporates heating/cooling coils along with boilers and chillers. a) window air conditioner b) packaged air conditioner c) unit ventilator d) rooftop unit e) combined air conditioner

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 ductwork and carrying the charge to a battery

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

What is the temperature of the cold deck supply air in both multi-zone and dual duct air conditioning systems? a) 5ºC b) 8.7ºC c) 12.5ºC d) 14.4ºC e) 17ºC

What other system is a single zone, constant air volume air conditioning system similar to? a) multi-zone system b) dual duct system c) rooftop unit system d) packaged air conditioning system e) central air conditioning system

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 piece of equipment was developed to provide temperature control in individual rooms in buildings such as hotels? a) a rooftop unit b) a window air conditioner c) a unit ventilator d) a packaged air conditioner e) a multi-zone unit

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 does the capacity of a heat pipe decrease to zero? a) at minus 10oC b) when the RH approaches 0% c) when the effects of gravity overcome the effects of the capillary action d) when the temperature differential is greater than 10oC e) when the vapour pressure in the heat tube is less than atmospheric vapour pressure

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 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 using a steam humidifier, what steam pressure should be used? a) 5 - 10 kPa b) 20 - 40 kPa c) 35 - 70 kPa d) 100 - 120 kPa e) 150 - 200 kPa

Which is not a disadvantage of a heat pipe recovery system? a) they are more expensive than the runaround system b) a large space is required c) relatively low recovery range d) difficult to retrofit e) recovery is limited when there's a chance that frost will form on the exhaust section

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 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 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 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 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 multizone 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 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 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 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 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 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

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 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

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

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

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

Depending on the workmanship, air leakages from ducts can vary by __________. a) 1% to 5 % b) 3% to 5 % c) 5% to 10 % d) 5% to 30 % e) 10% to 40 %

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%

During sensible cooling a) relative humidity decreases b) enthalpy increases c) wet-bulb temperature increases d) relative humidity increases e) dewpoint temperature increases

During shutdown, oil heater pilots and main burners are checked for a) setting b) temperature c) pressure d) cleanliness e) flame pattern

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

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 cooling purposes, the mixed air temperature of an air handling unit is set to maintain what temperature? a) 5ºC b) 7.5ºC c) 10.5ºC d) 12.5ºC e) 15ºC

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

How is dehumidification in a large air conditioning system achieved? a) by the use of adsorbents b) by the use of absorbents c) by the use of steam grid dehumidifiers d) by cooling the air to its dewpoint e) by the use of activated charcoal

Humidifying units which 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 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 a steam heating coil control valve were properly selected, what would the outlet pressure from the valve be if the inlet pressure was 150 kPa? a) 150 kPa b) 120 kPa c) 100 kPa d) 75 kPa e) 50 kPa

If air at 13 degrees C can hold a maximum of 0.0032 kg of moisture per kilogram of air, what is the relative humidity if the air contains 0.0015 kg of moisture per 1 kg of air? a) 100% b) 2.13% c) 0.4% d) 47% e) 32%

In an air conditioning system that uses static pressure regulation to control volume flow, what happens when the differential pressure controller senses a rise in duct pressure? a) the zone temperatures rise b) velocities in the duct decrease c) the zone dampers throttle in d) the static pressure damper is throttled e) the fan motor speeds up

In an induction type combined air conditioning system, what causes the primary air to mix with the secondary air and circulate throughout the room? a) a mixing fan b) high velocity louvres c) mixing vanes d) movement of primary air through a nozzles e) distribution boxes

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

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

Machine bolts are most commonly supplied with a) pan heads b) oval heads c) Truss heads d) hexagon heads e) square heads

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

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

Specific volume on a psychrometric chart a) is plotted on vertical lines and read on the horizontal scale at bottom of the chart b) is plotted on horizontal lines and read on the vertical scale at left side of the chart c) is plotted on horizontal lines and read on the vertical scale at right side of the chart d) has its lines originate on the volume scale along the horizontal axis and they slope steeply upwards to the left of the chart e) is plotted on vertical lines and read on the horizontal scale at the top of the chart

Standard air is a) the volume of 1 kg of air at 15 degrees Celsius and 100 kpa b) the mass of 1 cubic metre 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 metre of dry air at 20 degrees Celsius and atmospheric pressure

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

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

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 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 average amount of water volume which evaporates from a cooling tower is: a) 10 % b) 2 % c) 3.5 % d) 5 % e) 15 %

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

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

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 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) radiographic inspection e) conducting a hydrostatic test

The propeller axial flow fan is used a) for low capacity, high pressure applications b) for low capacity, low pressure applications c) for high capacity, high pressure applications d) for high capacity, low pressure applications e) in ducted air distribution systems

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

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

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 type of material used for kitchen exhaust ducts are made of _________. a) fiberglass b) cement asbestos c) galvanized steel d) heavy gauge black steel e) copper

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 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 vane axial flow fan a) has a more spiral air flow that tube axial fan b) has a more turbulent air flow than the tube axial fan c) has a 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 volume of standard air is a) 0.533 kg/cubic metres of dry air b) 0.633 kg/cubic metres of dry air c) 0.733 kg/cubic metres of dry air d) 0.833 kg/cubic metres of dry air e) 0.933 kg/cubic metres of dry air

This type of combined air conditioning system uses a central makeup unit, high velocity ducting, a sound absorber, and individual room units a) hydronic heat pump system b) constant air volume system with perimeter heating c) fan-coil units with makeup air d) induction system e) variable air volume with perimeter heating

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 calculate the heat gain from fluorescent lighting, add the wattage ratings and multiply by: a) 0.4 b) 0.8 c) 1.1 d) 1.2 e) 2.1

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 measure valve tappet clearances one would most aptly use a) an inside micrometer b) a thread micrometer c) a depth micrometer d) feeler gauges e) round or fillet gauges

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

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

What is one method of preventing ice build-up on the recovery coil of a runaround heat recovery system during cold weather? a) by using electric heating elements on the coil b) by the use of a pre-heat coil c) by using a steam to glycol heat exchanger d) by using a three-way mixing valve to mix cold and warm glycol e) by throttling the air inlet dampers to restrict the airflow

What is the Coefficient of Performance of a heat pump which uses 4 kW of energy to produce 10 kW of heating capacity? a) 40 b) 0.4 c) 5 kW d) 2.5 e) 0.4 kW

What type of heat exchanger is a heat pipe recovery unit? a) cross flow, air to water b) counter flow, water to air c) parallel flow, air to air d) counter flow, air to air e) parallel flow, process to process

What type of piping systems may be used in a "Fan-coil Unit with Make-up Air" type combined air conditioning system? 1. one-pipe 2. two-pipe 3. three-pipe 4. four-pipe a) 1,2 b) 3,4 c) 1,2,3 d) 2,3,4 e) 1,3,4

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 shutting down a boiler for internal cleaning, you should: a) let it stand for a couple days then drain b) shut off fire, drain, open up and flush c) shut down the boiler then fill the boiler completely with chemically treated water d) allow it to cool, then drain, open up and flush e) shut off fire and flush with cold water to cool it down

When talking about heating or cooling coils, 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

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 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 there is the possibility of freezing temperatures, what type of liquid is used in a runaround type heat recovery system? a) steam b) water c) mineral oil d) ethylene glycol e) silicone thermal fluid

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

Which is not an advantage of a thermal wheel recovery system? a) pump, liquid, and piping is not required b) only a small motor is required c) good recovery of both latent and sensible heat d) it is easy to retrofit into a system e) a wide recovery temperature range is possible

Which of the following is a hand tool? a) electric drill b) steel tape c) micrometer d) hammer e) compound grinder

Which of the following is a limiting factor for the number of fins that can be used? a) Temperature of steam in coils b) Temperature of chilled water in the coils c) Fin material d) Resistance to airflow e) Face velocity

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 airstream 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 dehumidification 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 water coils is false? a) Coils should be hooked up in a counterflow 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.

With regard to oil leaving each heater pass, of particular importance is the a) pressure b) volume c) velocity d) temperature e) flash point

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 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 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 forced hot water circulating system can be classified as the following type: a) loop system b) one pipe system c) two pipe direct return system d) two pipe reverse return system e) all of the above

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

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 pressure duct system operates at _____ a) static pressure above 0.50 kPa b) static pressure less than 0.50 kPa c) static pressure up to 1.50 kPa d) velocities between 11 m/s to 25 m/s e) velocities greater than 25 m/s

A hot oil system uses a ______________________ fluid in place of steam or water, to conduct heat from a central source to other vessels and heating coils in a plant. a) refrigerant b) cooling c) heating d) condensing e) thermal

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 residential forced air system: a) is restricted to buildings of less than 180 square metres b) is usually fitted with a hot air duct, a cold air duct, and a return air duct c) is able to provide individual room temperature control d) can use low velocity ducting to increase temperature control e) is single zone in operation and control

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 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 typical hot oil circulating pump would be: a) a reciprocating pump b) a lobe pump c) a sliding vane pump d) a diaphragm pump e) a centrifugal pump

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

All power engineers should become familiar with workplace safety standards laid down and enforced by: a) ABSA b) SER c) ERCB d) ACB e) WCB

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

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

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

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

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

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

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

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 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

Effective temperature is defined as a measure of comfort which involves a) the effects of relative humidity b) the effects of air movement c) the effects of dry-bulb temperature d) the effects of wet-bulb temperature e) all of the above

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

Fiberglass ducts are used a) in high pressure systems b) to handle air with high moisture level 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

Fibreglass 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

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

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

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

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

Identify, from the list below, the combined psychrometric processes: 1. heating and humidification 2. cooling and humidification 3. cooling and dehumidification 4. mixtures of air a) 1,2 b) 2,3 c) 3,4 d) 1,2,3 e) 1,2,3,4

If 5.0 cubic metres per second of air enters a heating coil at 20 degrees C dry-bulb and 15 degrees C wet bulb, and leaves the heating coil at 30 degrees C dry bulb, what is the change in enthalpy? a) 52 kJ/kg b) 42 kJ/kg c) 15 kJ/kg d) 20 kJ/kg e) 10 kJ/kg

In a Variable Air Volume (with perimeter heat) combined air conditioning system, where are the VAV boxes located a) in the main ductwork b) in each diffuser c) in the exterior zones d) at the air handling unit discharge e) in the branch ducting

In a Variable Air Volume (with perimeter heating) combined air conditioning system, how are the VAV boxes controlled? a) by a flow meter in the fan discharge b) by the return air temperature c) by the outside air temperature d) by the supply fan volume control e) by the room thermostat

In order to convert velocity pressure to static pressure in an air distribution system, it is necessary to a) decrease the cross-sectional area of the duct b) increase the fan speed c) use a valve to change the pressure d) decrease the fan speed e) increase the cross-sectional area of the duct

In regards to ductwork, what must be provided at the fan discharge or suction openings? a) neoprene valves b) canvas louvres c) cushion heads d) diffusers take-off e) flexible connectors

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

It is generally accurate to say that: a) A water height or depth of 10.34 meters results in 1 kPa b) 10.21 kPa will result from 1 meter of static water head c) 1 kPa will result from a water head of 9.8 meters d) Atmospheric pressure has no bearing on static water head e) 9.8 kPa pressure results from every meter of water depth or height

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

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

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 ductwork e) all of the above

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

One of the most expensive methods of volume control for an air system is the __________. a) direct drive b) v-belt drive c) variable inlet vane control d) outlet damper control e) variable speed motor control

Proper performance of heating and cooling water coils depends on a) adequate air velocity over the finned surface b) counterflow arrangement of air and water c) air venting from the system and the coil d) tube circuiting and finning e) all of the above

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

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

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 In order to provide uniform steam distribution to the individual tubes, which of the above design parameters is/are true? a) ii, iii, and v b) iii only c) ii and iv d) i, iii, iv, and v e) i, ii, and iii

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

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 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 dry-bulb temperature scale is read on a psychometric 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 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 main cause(s) of furnace explosions in black liquor recovery boilers is(are): a) black liquor with a low solids content b) faulty air supply c) smelt-water explosions d) operator error e) a & c

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 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 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 piping generally used for a hot oil system is: a) austenitic steel b) stainless steel c) copper alloy d) cast iron e) carbon steel

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 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 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 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 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 top of a rung ladder should extend approximately _________ above the level of the upper landing to which it provides access. a) 0.2 metres b) 2 metres c) 0.5 metres d) 0.3 metres e) 1 metres

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

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 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

Using the psychrometric chart, find the enthalpy if the dry-bulb temperature is 20 degrees C and the wet-bulb temperature is 15 degrees C. 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 specific volume, if the dry-bulb temperature is 25 degrees C and the wet-bulb temperature is 20 degrees C. a) 0.84 cubic metres / kg b) 0.852 kg / cubic metres c) 0.85 cubic metres / kg d) 0.90 cubic metres / kg e) 0.862 cubic metres / kg

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

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

What can be used to prevent wide temperature swings in an air conditioned space when using a direct expansion heat exchanger and on/off control? a) bypass dampers b) tempering steam c) heating elements d) two position thermostats e) a thermostatic expansion valve

What is often done when the required temperature rise through a steam preheat coil exceeds 18 oC? a) hotter steam is used b) a separately fired heating coil is added c) air flow is restricted to 10 cubic metres per minute d) the system is put to 100% recirculated air e) two or more preheat coils in series are used

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 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 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 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 shutting down a hot oil system, the oil is circulated in order to prevent: a) uneven cooling of oil b) oil viscosity becoming too low c) over pressurization of the heater d) oil deterioration due to thermal cracking e) hot spots from forming

When sub-zero weather is encountered, what limits the efficiency of a runaround heat recovery system? a) higher viscosity of the fluid increases pump power demand b) the temperature differential between inlet and exhaust isn't sufficient c) fluid flow through the coils must be throttled during cold weather therefore heat recovery is minimal d) in sub-zero temperatures, heat is not recoverable e) frost build-up on the recovery coil restricts airflow over the coil

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

Whenever feasibly possible, when checking bearings on running pieces of equipment it is wise to: a) Check the oil quantity leaving each b) Observe the temperature on a thermometer c) Smell the normal odors of the running bearing d) Check the oil quality leaving each e) Get accustomed to normal running temperature and vibration by feel

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 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 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 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 duct leakage losses is true? a) The effects of air leakage in supply air ducts are the same as those in return ducts. b) Air leakage varies from 40% to 45%. 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) Losses due to air leakage from furred supply air ducts within the conditioned space can only be evaluated on the basis of judgement.

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 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 is accurate? 1. Heat loss by infiltration is proportional to wind speed 2. Increasing the layers of glass in windows decreases losses 3. Proper ventilation requirements are determined by the air change method 4. Cold outer walls radiate this cold to interior objects a) 1,2 b) 3,4 c) 1,2,3 d) 2,3,4 e) 1,2,3,4

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

Why infiltration shouldn't be depended on to supply a building's ventilation requirements? a) Infiltration can cause a negative pressure in the building b) Infiltration causes condensation problems c) Infiltration fans require large amounts of power d) Infiltration can only be controlled by complicated dampers and louvres e) Infiltration can drop to zero if there is no wind

or what chief purpose is the ground wood pulp, which is produced by the mechanical process, used: a) cardboard b) soft paper products c) blending with wood chips d) stationery products e) newsprint

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Module 3

MRU2.4: Another Look at Comparative Advantage

Lewis Chapter 58 Chronic Neurologic Problems Questions, LEWIS: Chapter 61: Peripheral Nerve and Spinal Cord Problems, Lewis Ch 59 - Dementia and Delirium, Chapter 55 (Lewis): Nervous System