Powerplant 2
What is the purpose of the check valve generally used in a dry sump lubrication system?
To prevent the oil from the supply tank from seeping into the crankcase during inoperative periods
Why are fluxed orifice nozzles used in the lubrication system of gas turbine engines?
To provide a relatively constant oil flow to the main bearings at all engine speeds
1. Wet sump oil systems are most commonly used in gas turbine engines. 2. In most turbine engine oil tanks, a slight pressurization of the tank is desired to ensure a positive flow of oil. Regarding the above statements,
Only No. 2 is true
A continuous loop fire detector is what type of detector?
Overheat detector
In what units are turbine engine tachometers calibrated?
Percent of engine RPM
Why is it unnecessary to flash the field of the exciter on a brushless alternator?
Permanent magnets are installed in the main field poles
What is the source of most of the heat that is absorbed by the lubricating oil in a reciprocating engine?
Pistons and cylinder walls
An indication of unregulated power changes that result in continual drift of manifold pressure indication on a turbo supercharged aircraft engine is known as...
Bootstrapping
In regard to using a turbine engine oil analysis program, which of the following is NOT true?
Generally, an accurate trend forecast may be made after an engine's first oil sample analysis
If the points in a vibrator type voltage regulator stick in the closed position while the generator is operating, what will be the probable result?
Generator output voltage will increase
Alternators (AC generators) that are driven by a constant speed drive (CSD) mechanism are used to regulate the alternator to a constant...
Hertz output
Which of these characteristics is desirable in turbine engine oil?
High flash point
How is the strength of a magneto magnet checked?
Hold the point open and check the output of the primary coil with an AC ammeter while operating the magneto at a specified speed
Which of the following is a function of the fuel oil heat exchanger on a turbojet engine?
Increases fuel temperature
What would be the probable result if the oil system pressure relief valve should stick in the open position on a turbine engine?
Insufficient lubrication
What is the purpose of a reverse current cutout relay?
It opens the main generator circuit whenever the generator voltage drops below the battery voltage
Which statement is correct concerning a thermo-couple type temperature indicating instrument system?
It requires no external power source
Upon what quality or characteristic of a lubricating oil is its viscosity index based?
Its rate of change in viscosity with temperature change
The main oil filters strain the oil at which point in the system?
Just as it leaves the pressure pump
What precaution is usually taken to prevent electrolyte from freezing in a lead acid battery?
Keep battery fully charged
The fire detection that uses two wires imbedded in a ceramic core within a tube is the...
Kidde system
Two continuous-loop fire detection systems that will not test due to a broken detector element are the...
Kidde system and the Fenwal system
A fire detection system operates on the principle of a build up of gas pressure with in a tube proportional to temperature. Which of the following systems does this statement define?
Lindberg continuous element system
From the following, identify the factor that has the least effect on the oil consumption of a specific engine...
Mechanic efficiency
What is the primary purpose of the tachometer on an axial compressor turbine engine?
Monitor engine RPM during starting and to indicate overspeed conditions
If the thermocouple leads were inadvertently crossed at installation, what would the cylinder temperature gauge pointer indicate?
Moves off scale on the zero side of the meter
What is the smallest terminal stud allowed for aircraft electrical power systems?
No. 10
(refer to figure 4) The following data concerning the installation of an electrical unit is known: current requirements for continuous operation-11 amperes; measured cable length-45 feet; system voltage-28 volts (do not exceed 1 volt drop); cable in conduit and bundles. What is the minimum size copper electrical cable that may be selected?
No. 12
Where is the oil temperature bulb located on a dry sump reciprocating engine?
Oil inlet line
What unit in an aircraft engine lubrication system is adjusted to maintain the desired system pressure...
Oil pressure relief valve
What prevents pressure within the lubricating oil tank from rising above or falling below ambient pressure (reciprocating engine)?
Oil tank vent
What will result if an oil filter becomes completely blocked?
Oil will flow at the normal rate through the system
Why do helicopters require a minimum of two synchronous tachometer system?
One indicates engine RPM and the other main rotor RPM
On a twin engine aircraft with fuel injected reciprocating engines, one fuel flow indicator reads considerably higher than the other in all engine operating configurations. What is the probable cause of this indication?
One or more fuel nozzles are clogged
1, Serviceability limits for turbine blades are much more stringent than are those for turbine nozzle vanes. 2. A limited number of small nicks and dents can usually be permitted in any area of a turbine blade. Regarding the above statements,
Only No. 1 is true
1. Electrical wires larger than 10 gauge use uninsulated terminals. 2. Electrical wires smaller than 10 gauge use uninsulated terminals. Regarding the above statements,
Only No. 1 is true
1. Engine pressure ratio (EPR) is a ratio of the exhaust gas pressure to the engine inlet air pressure, and indicates the thrust produced. 2. Engine pressure ratio (EPR) is a ratio of the exhaust gas pressure to the engine inlet air pressure, and indicates volumetric efficiency. Regarding the above statements,
Only No. 1 is true
1. Gas turbine and reciprocating engine oils can be mixed or used interchangeably. 2. Most gas turbine engine oils are synthetic Regarding the above statements,
Only No. 2 is true
Where are hot and cold junctions located in an engine cylinder temperature indicating system?
The hot junction is located at the cylinder and the cold junction is located at the instrument
What is the primary purpose of changing aircraft engine lubricating oils at predetermined periods?
The oil becomes contaminated with moisture, acids and finely divided suspended solid particles
What will be the result of operating an engine in extremely high temperatures using a lubricant recommended by the manufacturer for a much lower temperature?
The oil pressure will be lower than normal
What will happen to the return oil if the oil line between the scavenger pump and the oil cooler separates?
The return oil will be pumped overboard
The engine oil temperature regulator is usually located between which of the following on a dry sump reciprocating engine?
The scavenger pump outlet and the oil storage tank
What determines the minimum particle size which will be excluded or filtered by a Cuno type (stacked disc, edge filtration) filter
The spacer thickness
Upon what does the output frequency of an AC generator (alternator) depend?
The speed of rotation and the number of field poles
Which of the following is regulated in a generator to control its voltage output?
The strength of the field
Which of the following fire detection systems uses heat in the normal testing of the system?
The thermocouple system and the Lindberg system
If all other requirements can be met, what type of oil should be used to achieve theoretically perfect engine lubrication?
The thinnest oil that will stay in place and maintain a reasonable film strength
What unit in a tachometer system sends information to the indicator?
The three phase AC generator
Which statement is true regarding a thermocouple type cylinder head temperature measuring system?
The voltage output of a thermocouple system is determined by the temperature difference between the two ends of the thermocouple
In addition to fuel quantity, a computerized fuel system (CFS) with a totalizer indicator provides indication of how many of the following? 1. Fuel flow rate 2. Fuel used since reset or initial start up 3. Fuel time remaining at current power setting 4. Fuel Temperature
Three
What are two types of AC motors that are used to produce a relatively high torque?
Three phase induction and capacitor start
How is the oil collected by the piston oil ring returned to the crankcase?
Through holes drilled in the piston oil ring groove
What is the function of a fire detection system?
To activate a warning device in the event of a power plant fire
What is the purpose of a safety gap in some magnetics?
To discharge the secondary coil's voltage if an open occurs in the secondary circuit
What is the purpose of the last chance oil filters?
To filter the oil immediately before it enters the main bearings
Why is an aircraft reciprocating engine oil tank on a dry sump lubrication equipped with a vent line?
To prevent pressure buildup in the oil tank
Why are high tension ignition cables frequently routed from the distributors to the spark plugs in flexible metallic conduits?
To reduce the effect of the high frequency electromagnetic waves emanated during operation
What is the primary purpose of the hopper located in the oil supply tank of some dry sump engine installations?
To reduce the time required to warm the oil to operating temperature
Oil picks up the most heat from which of the following turbine engine components?
Turbine bearing
What would be the possible cause if a gas turbine engine has high exhaust gas temperature, high fuel flow, and low RPM at all engine power settings?
Turbine damage or loss of turbine efficiency
What instrument on a gas turbine engine should be monitored to minimize the possibility of a "hot" start?
Turbine inlet temperature
What is used to polish commutators or slip rings?
Very fine sandpaper
Under which of the following conditions is the oil cooler flow control valve open on a reciprocating engine?
When the temperature of the oil returning from the engine is too low
In a fixed fire extinguishing system, there are two small lines running from the system and exiting overboard. These line exit ports are covered with a blowout type indicator disc, Which of the following statements are true?
When the yellow indicator disc is missing, it indicates the fire extinguishing system has been normally discharged
The primary source of oil contamination in a normally operating reciprocating engine is...
combustion deposits due to combustion chamber blow by and oil migration on the cylinder walls
A turbine engine dry sump lubrication system of the self contained, high pressure design...
consists of pressure, breather, and scavenge subsystems
The generating system of an aircraft charges the battery by using...
constant voltage and varying current
What is the principle of operation of the continuous loop fire detector system sensor?
core resistance material which prevents current flow at normal temperatures
The purpose of the flow control valve in a reciprocating engine oil system is to...
direct oil through or around the oil cooler
Specific gravity is a comparison of the weight of a substance to the weight of an equal volume of...
distilled water at a specific temperature
Engine pressure ratio is determined by...
dividing turbine outlet total pressure by engine inlet total pressure
One way that the automatic ignition relight systems are activated on gas turbine engines is by a...
drop in compressor discharge pressure
What type of oil system is usually found on turbine engines?
dry sump, pressure, and spray
Magneto breaker point opening relative to the position of the rotating magneto and distributor rotor (internal timing) can be set most accurately...
during assembly of the magneto before installation on the engine
Lube system last chance filters in turbine engines are usually cleaned...
during overhaul
A common type of electrically operated oil temperature gauge utilizes...
either a Wheatstone bridge or ratiometer circuit
The engine pressure ratio (EPR) indicator is a direct indication of...
engine thrust being produced
Engine oil temperature gauges indicate the temperature of the oil...
entering the engine
Oil accumulation in the cylinders of an inverted in line engine and in the lower cylinders of a radial engine is normally reduced or prevented by...
extended cylinder skirts
As the flux density in the field of a DC generator increases and the current flow to the system increases, the...
force required to turn the generator increases
A drop in oil pressure may be caused by...
foreign material under the relief valve
The maximum number of terminals that may be connected to any one terminal stud in an electrical system is...
four
Basically, the indicator of a tachometer system is responsive to change in...
frequency
The RPM indication of a synchronous AC motor tachometer is governed by the generator...
frequency
Engine pressure ratio is the total pressure ratio between the...
front of the compressor and the rear of the turbine
Which of the following lubrication system components is never located between the pressure pump and the engine pressure system?
fuel line for oil dilution system
The fuel flow indication data sent from motor driven impeller and turbine, and motorless type fuel flow transmitters is a measure of...
fuel mass flow
The fuel flow indication system used with many fuel injected opposed engine airplanes utilizes a measure of...
fuel pressure
The purpose of an exhaust gas analyzer is to indicate the...
fuel/air ratio being burned in the cylinders
The greatest density of flux lines in the magnetic circuit of a rotating magnet type magneto occurs when the magnet is in what position?
full alignment with the field shoe faces
As an aid to cold weather starting, the oil diluting system thins the oil with...
gasoline
If a generator is malfunctioning, its voltage regulator can be reduced to residual by actuating the...
generator master switch
Compared to reciprocating engine oils, the types of oils used in turbine engines...
have less tendency to produce lacquer or coke
The fuel flow meter used with a continuous-fuel injection system installed on an aircraft horizontally opposed reciprocating engine, is that a plugged fuel injection nozzle will cause a...
higher than normal fuel flow indication
In a turbine engine, where is the turbine discharge pressure indicator sensor located?
immediately aft of the last turbine stage
Where are sludge chambers, when used in aircraft engine lubrication systems, usually located?
in the crankshafts throws
The basic oil pressure relief valve setting for a newly overhauled engine is made...
in the overhaul shop
Lubricating oils with high viscosity index ratings are oils...
in which the viscosity does not vary much with temperature change
A manifold pressure gauge is designed to...
indicate absolute pressure in the intake manifold
Aircraft that operate more than one generator connected to a common electrical system must be provided with...
individual generator switches that can be operated from the cockpit during flight
As a general rule, a small amount of small fuzzy particles or gray metallic paste on a turbine engine magnetic chip detector...
is considered to be the result of normal wear
The pumping capacity of the scavenger pump in a dry sump aircraft engine's lubrication system...
is greater than the capacity of the oil supply pump
According to the electron theory of the flow of electricity, when a properly functioning DC alternator and voltage regulating system is charging an aircraft's battery, the direction of current flow through the battery...
is into the negative terminal and out the positive terminal
The constant current method of charging a ni-cad battery...
is the method most effective in maintaining cell balance
The oil used in reciprocating engines has a relatively high viscosity due to...
large clearances and high operating temperatures
At cruise RPM, some of the oil will flow through the relief valve of a gear type engine oil pump. This is normal as the relief valve is set at a pressure which is...
lower than the pressure pump capabilities
When timing a magneto internally, the alignment of the timing marks indicates that the...
magneto are in the E-gap position
A change in engine manifold pressure has a direct effect on the...
mean effective cylinder pressure
The recommended aircraft engine lubricants are...
mineral or synthetic based
After making a welded repair to a pressurized type turbine engine oil tank, the tank should be pressure checked to...
not less than 5 PSI plus the maximum operating pressure of the tank
On an aircraft turbine engine, operating at a constant power, the application of engine anti icing will result in...
noticeable shift in EPR
The EGT-gauge used with reciprocating engines is primarily used to furnish temperature readings in order to...
obtain the best mixture setting for fuel efficiency
Excessive oil is prevented from accumulating on the cylinder walls of a reciprocating engine by...
oil control rings on the pistons
Where is the oil of a dry sump reciprocating engine exposed to the temperature control valve sensing unit?
oil cooler inlet
In a jet engine which uses a fuel oil heat exchangers, the oil temperature is controlled by a thermostatic valve that regulates the flow of...
oil through the heat exchanger
As a general rule, starter brushes are replaced when they are approximately...
one half their original length
Which of the following factors helps determine the proper grade of oil to use in a particular engines?
operating speed of bearings
A typical barrier type aircraft terminal strip is made of...
paper base phenolic, compound
In order to reduce the possibility of ground shorting the circuits when the connectors are separated for maintenance, the AN and MS electrical connectors should be installed with the...
pin section on the ground side of the electrical circuit
Which of the following bearing types must be continuously lubricated by pressure oil?
plain
The types of oil pumps most commonly used on turbine engines are classified as...
positive displacement
In a reciprocating engine, oil is directed from the relief valve to the inlet side of the...
pressure pump
The valve assemblies of opposed reciprocating engines are lubricated by means of a ...
pressure system
A complete break in the line between the manifold pressure gauge and the induction system will be indicated by the gauge registering...
prevailing atmospheric pressure
The purpose of a relief valve installed in the tank venting system of a turbine engine oil tank is to...
prevent oil pump cavitation by maintaining a constant pressure on the oil pump inlet
Manufacturers normally require turbine engine oil servicing within a short time after engine shutdown primarily to...
prevent over-servicing
Aircraft copper electrical wire is coated with tin silver, or nickel in order to...
prevent oxidation
Some larger reciprocating engines use a compensating oil pressure relief valve to...
provide a high engine oil pressure when the oil is cold and automatically lower the oil pressure when the oil is warmed up
Bonding jumpers should be designed and installed in such a manner that they...
provide a low electrical resistance in the ground circuit
The oil dampened main bearing utilized in some turbine engines is used to...
provide an oil film between the outer race and the bearing housing in order to reduce vibration tendencies in the rotor system, and to allow for slight misalignment
The purpose of directing bleed air to the outer turbine case on some engines is to...
provide optimum turbine blades tip clearance by controlling thermal expansion
An engine lubrication system pressure relief valve is usually located between the...
pump and the internal oil system
The part of a DC alternator power system that prevents reverse flow of current from the battery to the alternator is the...
rectifier
In order to relieve excessive pump pressure in an engine's internal oil system, most engines are equipped with a...
relief valve
As the generator load is increased (within its rated capacity), the voltage will...
remain constant and the amperage output will increase
In order to maintain a constant oil pressure as the clearances between the moving parts of an engine increase through normal wear, the supply pump output...
remains relatively constant (at a given RPM) with less oil being returned to the pump inlet by the relief valve
The viscosity of a liquid is a measure of its...
resistance to flow
The reason for flashing the field in a generator is to...
restore correct polarity and/or residual magnetism to the field poles
The purpose of a dwell chamber in a turbine engine oil tank is to provide...
separation of entrained air from scavenger oil
Low oil pressure can be determined to the internal engine components, However, high oil pressure...
should be limited to the engine manufacturer's recommendations
ON-OFF two position engine electrical switches should be installed...
so the ON position is reached by a forward or upward motion
When a magneto is disassembled, keepers are usually placed across the poles of the rotating magnet to reduce the loss of the magnetism. These keepers are usually made of...
soft iron
Cylinder walls are usually lubricated by...
splashed or sprayed oil
A term commonly used when two or more electrical terminals are installed on a single lug or a terminal strip is...
stacking
When the starter switch to the aircraft gas turbine starter generator is energized and the engine fails to rotate, one of the probable causes would be the...
starter solenoid is defective
The most effective method of regulating aircraft direct current generator output is to vary, according to the load requirements, the...
strength of the stationary field
The resistance of the current return path through the aircraft is always considered negligible provided the...
structure is adequately bonded
If the oil cooler core and annular jacket becomes congealed, what unit prevents damage to the cooler?
surge protection valve
A certain direct current series motor mounted within an aircraft draws more amperes during start than when it is running under its rated load. The most logical conclusion that may be drawn is...
the condition is normal for this type of motor
A high surge of current is required when a DC electric motor is first started. As the speed of the motor increases,
the counter EMF, thus reducing the current flow through the armature
When a 28 volt, 75 ampere generator is installed on an aircraft, an electrical load analysis ground check is performed and it is determined that the battery is furnishing 57 amperes to the system, with all electrical equipment operating. This indicates...
the load will be within the generator limit
A red triangle, dot, or diamond mark on an engine instrument face or glass indicates...
the maximum limit for high transients such as starting
The vent line connecting the oil supply tank and the engine in some dry sump engine installations permits...
the oil tank to be vented through the normal engine vent
For fire detection and extinguishing purposes, aircraft power plant areas are divided into fire zones based on...
the volume and smoothness of the airflow through engine compartments
Which of the following fire detection systems measures temperature rise compared to a reference temperature?
thermocouple
A fire detection system that operates on the rate of temperature rise is a...
thermocouple system
How many basic types of circuit breakers are used on power plant installation electrical systems?
three
The exhaust gas temperature (EGT) indicator on a gas turbine engine provides a relative indication of the...
turbine inlet temperature
In an axial flow turbine engine, compressor bleed air is sometimes used to aid in cooling the...
turbine, vanes, blades, and bearings
Motor-driven impeller and turbine fuel flow transmitters are designed to transmit data...
using aircraft electrical system power
The time in seconds required for exactly 60 cubic centimeters of oil flow through an accurately calibrated orifices at a specific temperature is recorded as a measurement of the oil's...
viscosity
Arcing at the brushes and burning of the commutator of a motor may be caused by...
weak brush springs
The E gap angle is usually defined as the number of degrees between the neutral position of the rotating magnet and the position...
where the contact points open
The use of water on class D fires...
will cause the fire to burn more violently and can cause explosions
What instrument indicates the thrust of a gas turbine engine?
Engine Pressure Ratio indicator
In which of the following situations will the oil cooler automatic bypass valve be open the greatest amount?
Engine oil below normal operating temperature
An oil separator is generally associated with which of the following?
Engine-driven vacuum pump
The fire detection system that uses a single wire surrounded by a continuous string of ceramic beads in a tube is the...
Fenwal system
Why is expansion space required in an engine oil supply tank?
For oil enlargement and collection of foam
What is the maximum number of bonding jumper wires that may be attached to one terminal grounded to a flat surface?
Four
Which unit most accurately indicates fuel consumption of a reciprocating engine?
Fuel flowmeter
As a general rule, the mixture setting on a reciprocating engine operating at or near takeoff power that provides the best cooling is...
Full, Rich
What basic meter is used to indicate cylinder head temperature in most aircraft?
Galvanometer
Which of the following is a primary engine instrument?
Tachometer
Which of the following has the greatest effect on the viscosity of lubricating oil?
Temperature
Which of the following fire detection systems will detect a fire when an element is inoperative but will not test when the test circuit is energized?
The Kidde system and the Fenwal system
According to Federal Aviation Regulations oil tank fillers on the turbine engines must be marked with the word...
"Oil"
Oil tank fillers on reciprocating engines are marked with the word...
"oil" in accordance with 14 CFR Part 23
A Bourdon tube instrument may be used to indicate... 1. pressure 2. temperature 3. position 4. quantity
1 and 2
In addition to lubricating (reducing friction between moving parts), engine oil performs what functions? 1. cools 2. seals 3. cleans 4. prevents corrosion 5. cushions Impact (shock) loads
1,2,3,4,5
What is the ampere hour rating of a storage battery that is designed to deliver 45 amperes for 2.5 hours?
112.5 amperes hours
Which Federal Aviation Regulation requirement prevents the use of automatic reset circuit breakers?
14 CFR Part 23
Which Federal Aviation Regulation specifies that each resettable circuit protective device requires manual operation to restore service after the device has interrupted the circuit?
14 CFR Part 23
Which of the following Federal Aviation Regulations require that all aircraft using fuses as the circuit protective devices carry "one spare set of fuses, or three spare fuses of each kind required"?
14 CFR Part 91
The maximum allowable voltage drop between the generator and the bus bar is...
2 percent of the regulated voltage
An oil tank having a capacity of 5 gallons must have an expansion space of...
2 quarts
Jet engine thermocouples are usually constructed of...
chromel-alumel
A fuel or oil fire is defined as a...
class B fire
A fire involving energized electrical equipment is defined as a...
class C fire
(refer to figure 2) Determine the fire extinguisher container pressure limits when the temperature is 75 degrees F.
338 minimum and 424 maximum
(refer to figure 4) In a 28 volt system, what is the maximum continuous current that can be carried by a single No. 10 copper wire 25 feet long, routed in free air?
35 amperes
What is the frequency of most aircraft alternating current?
400 Hertz
(refer to figure 3) What are the fire-extinguisher container pressure limits when the temperature is 50 degrees F?
475-625 PSIG
Which of the following instrument conditions is acceptable and does NOT require immediate correction? 1. Red line missing 2. Pointer loose on shaft 3. Glass cracked 4. Mounting screws loose 5. Case paint chipped 6. Leaking at line B nut 7. Will not zero out 8. Fogged
5
What speed must an eight-pole AC generator turn to produce 400-Hertz AC?
6,000 RPM
How many hours will a 14 ampere hour battery deliver 15 amperes?
9.33 hours
What is the operating principle of the spot detector sensor in a fire detection system?
A bimetallic thermoswitch that closes when heated to a high temperature
What device is used to convert alternating current, which has been induced into the loops of the rotating armature of a DC generator, to direct current?
A commutator
What is a basic advantage of using AC for electrical power for a large aircraft?
AC systems operate at higher voltage than DC systems and therefore use less current and can use smaller and lighter weight wiring
What section in the instructions for continued airworthiness is FAA approved?
Airworthiness limitations section
Aircraft electrical wire size is measured according to the...
American Wire Gauge system
Select the Airworthiness Directives applicability statement which applies to an NO 355 engine, serial number T8164, with 2,100 hours total time and 300 hours since rebuilding.
Applies to all IVO-355 engines, serial numbers T8000 through T8300, having less than 2,400 hours total time
What type of oil do most engine manufacturers recommend after new reciprocating engine break in?
Ashless dispersant oil
1. Most modern aircraft use circuit breaker rather than fuses to protect their electrical circuits. 2. Federal Aviation Regulations Part 23 requires that all electrical circuits incorporate some form of circuit protective device. Regarding the above statements,
Both No. 1 and No. 2 are true
1. Power plant instrument range markings show whether the current state of power plant operation is normal, acceptable for a limited time, or unauthorized. 2. Power plant instrument range markings are based on installed engine operating limits which may not exceed (but are not necessarily equal to) those limits shown on the engine Type Certificate Data Sheet. Regarding the above statements,
Both No. 1 and No. 2 are true
1. Alternators are rated in volt amps, which is a measure of the apparent power being produced by the generator. 2. Alternating current has the advantage over direct current in that its voltage and current can easily be stepped up or down. Regarding the above statements,
Both No. 1 and No.2 are true
1. Fuel may be used to cool oil in gas turbine engines. 2. Ram may be used to cool oil in gas turbine engines. Regarding the above statements,
Both No.1 and No. 2 are true
Instruments that measure relatively high fluid pressures, such as oil pressure gauges, are usually what type?
Bourdon tube
What retains the nitrogen charge and fire extinguishing agent in a high rate of discharge (HRD) container?
Breakable disk and fusible disk
Which of the following is the safest fire extinguishing agent to use from a standpoint of toxicity and corrosion hazards?
Bromotrifluoromethane (halon 1301)
How are the rotor windings of an aircraft alternator usually excited?
By a variable direct current
How are discharged nozzles in a fuel injected reciprocating engine identified to indicate the flow range?
By an identification letter stamped on one of the hexes of the nozzle body
How are the piston pins of most aircraft engines lubricated?
By oil which is sprayed or thrown by the master or connecting rods
How are the teeth of the gears in the accessory section of an engine normally lubricated?
By splashed or sprayed oil
Which type valve prevents oil from entering the main accessory case when the engine is not running?
Check
What advantage do mineral base lubricants have over vegetable oil base lubricants when used in aircraft engines?
Chemical stability
The pulling out (or down) of an illuminated fire handle in a typical large jet aircraft fire protection system commonly accomplished what event?
Closes fuel shutoff, closes hydraulic shutoff, disconnects the generator field, and arms the fire extinguishing system
How does carbon dioxide (CO2) extinguish an aircraft engine fire?
Contact with the air converts the liquid into snow and gas which smothers the flame
When does current flow through the coil of a solenoid operated electrical switch?
Continually, as long as the control circuit is complete
What is the primary purpose of the oil to fuel heat exchanger?
Cool the oil
Which of the following conditions is usually not acceptable to any extent in turbine blades?
Cracks
Instruments that provide readings of low or negative pressure, such as manifold pressure gauges, are usually what type?
Diaphragm or bellows
When installing an electrical switch, under which of the following conditions should the switch be derated from its nominal current rating?
Direct current motor circuits
What type of electric motor is generally used with a direct cranking engine starter?
Direct current, series-wound motor
How are most aircraft turbine engine fire extinguishing system activated?
Electrically discharged cartridge
What publication contains the mandatory replacement time for parts of a turbine engine?
Engine Manufacturer's service Instructions
What is the primary purpose of the oil breather pressurization system that is used on turbine engines?
Provides a proper oil spray pattern from the main bearing oil jets
Which of the following fire detectors are commonly used in the power section of an engine nacelle?
Rate of temperature-rise detectors
Electric motors are often classified according to the method of connecting the field coils and armature. Aircraft engine starter motors are generally of which type?
Series
Which of the following is NOT used to detect fires in reciprocating engine nacelles?
Smoke detectors
Why does one type of Fenwal fire detection system use spot detectors wired in parallel between two separate circuits?
So that a single fault may exists in the system without a sounding a false alarm
Why is a constant speed drive used to control the speed of some aircraft engine driven generators?
So that the frequency of the alternating current output will remain constant
What type of lubricant may be used to aid in pulling electrical wires or cables through conduits?
Soapstone talc
How is the fire extinguishing agent distributed in the engine section?
Spray nozzles and perforated tubing
Which of the following aircraft circuits does NOT contain a fuse/circuit breaker?
Starter circuit
What type of oil do most engine manufacturers recommend for new reciprocating engine break in?
Straight mineral oil
Which of the following types of electric motors are commonly used in electric tachometers?
Synchronous motors
Which of the following instrument discrepancies require replacement of the instrument? 1. Red line missing from glass 2. Glass cracked 3. Case paint chipped 4. Will not zero 5. Pointer loose on shaft 6. Mounting screw loose 7. Leaking at line B nut 8. Fogged
`2,4,5,8
The indication on a thermocouple-type cylinder head temperature indicator is produced by...
a current generated by the temperature difference between dissimilar metal hot and cold junctions
When selecting an electrical switch for installation in an aircraft utilizing a direct current motor,
a derating factor should be applied
The explosive cartridge in the discharge valve of a fire extinguisher container is...
a life dated unit
When installing electrical wiring parallel to a fuel line, the wiring should be...
above the fuel line
The stationary field strength in a direct current generator is varied...
according to the load requirements
High tooth pressures and high rubbing velocities, such as occur with spur type gears, require the use of...
an EP lubricant
The fuel flow indicator rotor and needle for a motor impeller and turbine indicating system is driven by...
an electrical signal
In an aircraft equipped with a pressure drop type fuel flow indicating system, if one of the injector nozzles becomes restricted, this would cause a decrease in fuel flow with...
an increased fuel flow indication on the gauge
Generator voltage will not build up when the field is flashed and solder is found on the brush cover plate. These are most likely indications of...
an open armature
Thermocouple leads...
are designed for a specific installation and may not be altered
In a reciprocating engine oil system, the temperature bulb senses oil temperature...
at a point after the oil passed through the oil cooler
After a fire is extinguished, or overheat condition removed in aircraft equipped with a Systron-Donnel fire detector, the detection system...
automatically resets
1. Generally when a turbine engine indicates high EGT for a particular EPR (when there is no significant damage), it means that the engine is out of trim. 2. Some turbine powered aircraft use RPM as the primary indicator of thrust produced, others use EPR as the primary indicator. regarding THE ABOVE STATEMENTS,
bOTH nO. 1 AND nO. 2 ARE TRUE
The time/current capacities of a circuit breaker of fuse must be...
below those of the associated conductor
Possible failure related ferrous metal particles in turbine engine oil cause an (electrical) indicating type magnetic chip detector to indicate their presence by...
bridging the gap between the detector center (positive) electrode and the ground electrode
If a fuel flow oil filter is used on an aircraft engine, and the filter becomes completely clogged the...
bypass valve will open and the oil pump will supply unfiltered oil to the engines
The most satisfactory extinguishing agent for a carburetor or intake fire is...
carbon dioxide
The most satisfactory extinguishing agent for an electrical fire is...
carbon dioxide
