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PowerPlant Course Final
PowerPlant Course Final
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A years worth of powerplant is now a quiz.
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110 cards
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1
Which of the following influences the operation of a fuel control unit on a turbojet engine?
Exhaust gas temperature.
Mixture control position.
Compressor Inlet Temperature.
Burner pressure.
2
The explosive cartridge in the discharge valve of a fire-extinguisher container is
mechanically fired.
a life-dated unit.
not a life-dated unit.
weekly removal and inspection.
3
Which of the following defects would likely cause hot spot on a reciprocating engine cylinder?
Cowling air seal leakage.
Leaving oil on the block.
A cracked cylinder baffle.
Too much cooling fin area broken off.
4
If a float carburetor becomes flooded, the condition is most likely caused by
a clogged back-suction line.
the accelerating pump shaft being stuck.
plane has landed in the lake.
a leaking needle valve and seat assembly.
5
Fuel boost pumps are operated
primarily for fuel transfer to another tank.
during takeoff only.
during landing only.
to provide a positive flow of fuel to the engine.
6
How are most aircraft turbine engine fire-extinguishing systems activated?
Pushrod assembly.
Electrically discharged cartridges.
Manual remote control valve.
Automatic temperature sensor.
7
Prolonged idling of an engine will usually result in
foreign material buildup on spark plugs.
increased oil consumption.
low engine temps.
excessive cylinder head temperatures.
8
Which of the following is a characteristic of a thrust bearing used in most radial engines?
Double-roller ball.
Deep-groove ball.
Tapered roller.
Double-row ball.
9
The greatest portion of heat generated by combustion in a typical aircraft recip engine is
recycled into the engine oil cooler.
converted into useful power.
carried out with the exhaust gases.
dissipated through the cylinder walls and heads.
10
Fuel pressure produced by the engine-driven fuel pump is adjusted by the
bypass valve adjusting screw.
a left handed threaded 12 point bolt.
engine-driven fuel pump adjusting screw.
relief valve adjusting screw.
11
The use of water on Class D fires
has no effect.
is most effective if sprayed in a fine mist.
cause the fire to burn more violently and cause explosions.
works like a class A extinguisher.
12
What is a characteristic of a centrifugal-type boost pump?
It has positive displacement.
It requires a relief valve.
It separates air and vapor from the fuel.
It requires blue skies and warmth.
13
Master rod bearings are generally what type?
Ball
Flat
Plain
Roller
14
Some cylinder barrels are hardened by
nitriding.
tempering.
shot peening.
oxidizing.
15
Cylinder head temperatures are measured by means of an indicator and a
Flourstone bridge sensing system.
thermocouple sensing device.
resistance bulb sensing device.
Wheatstone bridge sensing device.
16
Which of the following fire detection systems uses heat in the normal testing of the system?
The thermocouple system and the Lindberg system.
Fire extinguisher system.
The thermocouple system and the Fenwal system.
The Kidde system and the Fenwal system.
17
The FAA Regulations require the fuel flow rate for gravity systems (main & reserve) to be
150% of maximum, except takeoff, engine fuel consumption.
150% of the takeoff fuel consumption of the engine.
200% of takeoff fuel consumption of the engine.
125% of the takeoff fuel consumption of the engine.
18
On which strokes are both valves open on a four-stroke engine?
Intake and Compression.
Exhaust and Intake.
Intake of Fuel/Air Mixture Stroke.
Power and Exhaust.
19
Cam-ground pistons are installed in some aircraft engines to
equalizes and compensates magneto timing.
compensating feature so compensated magneto is not required.
provide a better fit at operating temperatures.
equalize the wear on all pistons.
20
A fuel strainer of filter must be located between the
boost pump and tank outlet.
tank outlet and the fuel metering device.
in line with the engine fuel filter.
tank outlet and the fuel metering device.
21
In a high-tension ignition system, the current in the magneto secondary winding is
Wound tight with 1 million wraps.
induced by primary circuit discharges.
In parallel with the primary and secondary winding.
Induced when the primary circuit is interrupted.
22
The purpose of the diaphragm in most vane-type fuel pumps is to
maintain fuel pressure below atmospheric pressure.
equalize fuel pressure at all speeds.
compensate fuel pressure to altitude changes.
to help diagram the diaphragm system.
23
At what point in a axial-flow turbojet engine will the highest gas pressures occur?
Within the burner section
At the turbine entrance.
All of them .
At the compressor outlet.
24
The fire detection system that uses two wires imbedded in a core within a tube is the
Microsoft system.
Lindberg system.
Kidde system.
Fenwal system.
25
What directly regulates the speed of a turbocharger?
Waste Gate.
Brakes.
Throttle.
Turbine.
26
Which type of pump is commonly used as a fuel pump on reciprocating engines?
Impeller.
Gear.
Vane.
Propeller.
27
Boost manifold pressure is generally considered to be any manifold pressure above
14.7 inches of Hg
30 inches of Hg.
0 inches of Hg.
50 inches of Hg.
28
Full-floating piston pins are those which allow motion between the pin and
both the piston and the small end of the connecting rod.
the piston.
both the piston and the large end of the connecting rod.
block and crank shaft.
29
Which of the following bearing types must be continuously lubricated by pressure oil?
Double roller.
Ball.
Roller.
Plain.
30
Valve clearance changes on opposed-type engines using hydraulic lifters are accomplished by
valve spring replacement.
push rod replacement.
rocker arm replacement.
cylinder replacement.
31
Which of the following turbine fuel filters has the greatest filtering action?
Micron.
Stacked charcoal.
Macro filter.
Small wire mesh.
32
On a float-type carburetor, the purpose of the economizer valve is to
maintain leanest mixture possible during cruising power.
provide richer mixture and cooling at maximum power output.
economize oil cooling.
provide extra fuel for sudden acceleration of the engine.
33
Where should the main fuel strainer be located in the aircraft fuel system?
At the lowest point in the fuel system.
Downstream from the wobble pump check valve.
At any point in system, lower than the carburetor strainer.
At the highest point in the system.
34
Fuel lines are kept away from heat, sharp bends, steep rises to reduce the possibility of
liquid lock.
positive lock.
vapor lock.
fuel/air system lock.
35
Fuel flow indicator rotor; needle for motor-impeller and turbine indicating system is driven by
direct coupling to the motor shaft.
an electrical signal.
indirect mechanical coupling shaft.
a mechanical gear train.
36
Spark plugs are considered worn out when the
center electrode edges have become rounded
Its just not working the way you think.
electrodes are worn to about 1/2 of their orig. dimensions.
electrodes have worn away to about two-thirds
37
Reciprocating engines used in helicopters are cooled by
dry ice put on by mechanics.
blast tubes on either side of the engine mount.
the downdraft from the main rotor.
a fan mounted on the engine.
38
How are the rotor windings of an aircraft alternator usually excited?
By letting the smoke do its job.
By a variable direct current.
By a constant AC voltage from the battery.
By a constant AC voltage.
39
Carburetor icing is most severe at
low engine temperatures.
at temperatures between 30 and 40 F.
the top of a mountain.
high altitudes.
40
What is the purpose of the flow divider in a turbine engine duplex nozzle?
Creates the primary and secondary fuel supplies.
Provides a flow path for bleed air aiding in atomization.
Who knows but the engineer.
Allows alternate flow of fuel if primary flow is restricted.
41
When will small induction system air leaks have the most noticeable effect?
At full throttle.
When at high altitudes.
At maximum continuous and takeoff power settings.
At idle.
42
If fuel/air ratio is proper; ignition timing is correct; combustion process should be completed
when the exhaust valve opens at the end of the power stroke.
just before top dead center of the exhaust stroke.
20-30 degrees before top center: end of compression stroke.
just after top center at the beginning of the power stroke.
43
What is the electrical location of the primary capacitor in a high-tension magneto?
In parallel with the breaker points.
In parallel with the primary and secondary winding.
In series with the breaker points.
44
The operating temperature valve clearance of radial engine compared to cold valve clearance is
1000th of an inch.
less.
the same.
greater.
45
One source commonly used for carburetor air heat is
a muffler shroud or heat muff.
turbocharger heated air.
alternate air heat.
no heat.
46
What factor is not used in the operation of an aircraft gas turbine engine fuel control unit?
Compressor speed.
Power lever position.
Thrust reverser operation.
Mixture control position.
47
It is necessary to control acceleration and deceleration rates in turbine engines in order to
prevent blowout or die-out.
prevent over temperature.
prevent friction between turbine wheels and case.
falling out of the sky.
48
The fuel pump relief valve directs excess fuel to the
fuel tank return line.
outlet side of fuel pump.
inlet side of the fuel pump.
inlet side of the fuel strainer.
49
A continuous-loop fire detector is what type of detector?
Low temperature detector.
Rate of Temperature rise detector.
Overheat detector.
Spot detector.
50
The stationary field strength in a direct current generator is varied
because of generator speed.
when its purple.
according to the load requirements.
by the reverse-current relay.
51
A fuel pressure relief valve is required on
centrifugal fuel boost pumps.
engine-driven diaphragm-type fuel pumps.
cars and boats too.
engine-driven vane-type fuel pumps.
52
The differential pressure controller in a turbocharger system
reduces bootstrapping during part-throttle operation.
assists in stalling the engine.
positions the waste gate valve for maximum power.
provides a constant fuel-to-air ratio.
53
What part of an air-cooled cylinder assembly has the greatest fin area per square inch?
Cylinder barrel
Exhaust port.
Rear of the cylinder head.
Heads.
54
What are two types of AC motors that are used to produce a relatively high torque?
Three-phase induction and capacitor start.
Sunny pole and tall field.
Shaded pole and shunt field.
Shunt field and single phase.
55
If the main air bleed of a float carburetor becomes clogged, the engine will run
lean at rated power.
rich at rated power.
rich only while idling.
lean at cruise, rich at takeoff and landing.
56
A fire detection system that operates on the rate-of-temperature rise is a
thermal switch system.
thermocouple system.
circle to single rate system.
continuous-loop system.
57
Magneto timing drift is caused by erosion of the breaker points and
wear of the cam followers.
when you the A & P screw up.
excessive spark plug gap.
loss of magnetism in the rotor.
58
A fuel or oil fire is defined as a
Class B fire.
Class A fire.
Class C fire.
Class F fire.
59
A weak fuel to air mixture along with normal airflow through a turbine engine may result in
a lean die-out.
low EGT.
high EGT.
a rich flameout.
60
The reason for flashing the field in a generator is to
show off what under the trench coat.
increase generator capacity.
remove excessive deposits.
restore correct polarity / residual magnetism to field poles
61
During what period does the fuel pump bypass valve open and remain open?
When boost pump pressure is greater than fuel pump pressure.
When fuel pump is running at exceeded RPM.
When fuel pump output is greater than demand of carburetor.
When fuel pump pressure is greater than demand of engine.
62
The generating system of an aircraft charges the battery by using
constant current and varying voltage.
constant voltage and constant current.
lots of stuff.
constant voltage and varying current.
63
What part of an aircraft in flight will begin to accumulate ice before any other?
Carburetor
Propeller spinner or dome
Rudder leading edge.
Wing leading edge
64
As the generator load is increased (within its rated capacity), the voltage will
open then close rapidly to give power requirements.
remain constant and the amperage output will decrease.
decrease and the amperage output will increase.
remain constant and the amperage output will increase.
65
Which bearing is least likely to be a roller or ball bearing?
Rocker arm bearing (overhead valve engine).
Crankshaft main bearing (radial engine).
Master rod bearing (radial engine).
Engine Block Bearing (turbine engine).
66
The use of the carburetor air heater when it is not needed causes
a very lean mixture.
a decrease in power and possibly detonation.
a fire.
excessive increase in manifold pressure.
67
How are most aircraft turbine engine fire-extinguishing systems activated?
Hotrod assembly.
Electrically discharged cartridges.
Manual remote control valve.
Pushrod assembly.
68
The most satisfactory extinguishing agent for an electrical fire is
hydrogen dioxide.
methyl bromide.
carbon dioxide.
carbon tetrachloride.
69
Where is the highest gas pressure in a turbojet engine?
At the entrance of the turbine section.
AT the compressor fan.
At the outlet of the tailpipe section.
In the entrance of the burner section.
70
Where are sludge chambers, when used in aircraft engine lubrication systems, usually located?
Adjacent to the scavenger pumps.
In the crankshaft throws.
Oil pump screen sludge pocket.
In the oil storage tank.
71
The most satisfactory extinguishing agent for a carburetor or intake fire is
dry chemical.
methyle bromide.
carbon dioxide.
water sulfide.
72
Boost pumps in a fuel system
provide a positive flow of fuel to the engine pump.
provide negative flow.
operate during takeoff only.
are primarily used for fuel transfer.
73
The application of carburetor heat will have which of the following effects?
The mixture will become leaner.
The air when dissipate to rapidly.
The mixture will be come richer.
The manifold pressure will increase.
74
For what purpose is a turbine engine fuel control unit trimmed?
To obtain maximum thrust output when desired.
To properly position the power levers.
To adjust the idle RPM.
To control the mechanic from over speeding the engine.
75
To what altitude will a turbo-charged engine maintain sea level pressure?
Pressure Altitude.
Critical Altitude.
38,000 feet for unpressurized aircraft.
Service Ceiling.
76
The five events of a four-stroke, spark ignition engine in the order of their occurrence are
outake, power, ignition, compressor, exhaust.
intake, compression, ignition, power, exhaust.
intake, ignition, compression, power, exhaust.
intake, power, compression, ignition, exhaust.
77
A punctured float in a carburetor will cause the fuel level to
rise, and enrich the mixture.
rate high, ride low, relax in mixture.
lower, and enrich the mixture.
lower, and lean the mixture.
78
What type of electric motor is generally used with a direct-cranking engine starter?
Direct current, series wound motor.
Synchronous motor.
Direct current, shunt wound motor.
Any motor.
79
During ground operation of an engine, the cowl flaps should be in what position?
Fluctuates continuously.
Fully closed.
Fully open.
Opened according to ambient conditions.
80
Main bearing oil seals used with turbine engines are usually what type(s)?
Labyrinth and/or silicone rubber.
Labyrinth and/or carbon rubbing.
O-ring sealed labyrinth.
Teflon and synthetic rubber.
81
How is the fire-extinguishing agent distributed in the engine section?
Talcum powder and tubes.
Spray nozzles and perforated tubing.
Spray nozzles and fluid pumps.
Nitrogen pressure and slinger rings.
82
As manifold pressure increases in a reciprocating engine, the
weight of the fuel/air charge decreases.
density of air in the cylinder decreases rapidly.
volume of air in the cylinder increases.
density of air in the cylinder increases.
83
When the switch is off in a battery ignition system, the primary circuit is
shorted
open
buried
grounded
84
What test instrument could be used to test an ignition harness for suspected leakage?
A high amperage DC ammeter.
A low tension instrument tester.
A high voltage DC voltmeter.
A high-tension lead tester.
85
What retains nitrogen charge and fire-extinguishing agent in high rate of discharge container?
Pressure gauge and cartridge.
Dynamite discharge unit.
Pressure switch and check tee valve.
Breakable disk and fusible disk.
86
A defective primary capacitor in a magneto is indicated by
a fine-grained frosted appearance of the breaker points.
high tension spark happening.
burned and pitted breaker points
a weak spark.
87
Which of the following fire detectors are commonly used in power section of an engine nacelle?
Low temp sensors.
Smoke detectors.
CO detectors.
Rate of Temperature rise detectors.
88
A condition known as hot streaking in turbine engines is caused by
Av-gas low flow characteristics in turbine engines.
excessive fuel flow.
a misaligned combustion liner.
a partially clogged fuel nozzle.
89
Bootstrapping of a turbocharged engine is indicated by
engine power fluctuations.
an overboost condition of the engine on takeoff.
severe nose dive.
a maximum increase in manifold pressure.
90
Which of the following is NOT used to detect fires in reciprocating engine nacelles?
Smoke detectors.
Mist detectors.
Rate-of-temperature-rise detectors.
Flame detectors.
91
What is the function of a fire detection system?
Activate warning device in the event of a power plant fire.
To identify the location of a power plant fire.
To identify the hot bearing causing the fire.
Discharge fire-extinguishing system as the origin of fire.
92
Upon what does the output frequency of an AC generator depend?
The speed of rotation and the number of field poles.
The strength of the field and the number of field poles.
The speed of rotation and the strength of the field.
The rotatory of the rotations.
93
In an aircraft ignition system, one of the functions of the capacitor is to
facilitate rapid collapse of magnetic field in primary coil.
go in circles until it charges what it needs to.
regulate flow of current between primary and secondary coil.
stop flow of magnetic lines of force when points are open.
94
The purpose of two or more valve springs in aircraft engines is to
equalize valve face loading.
seat valves equally to head.
eliminate valve spring surge
equalize side pressure on the valve stems.
95
Where is the engine fuel shutoff valve usually located?
Aft of the firewall.
Upstream of the engine-driven fuel pump.
Downstream of the engine-driven fuel pump.
Adjacent to the fuel pump.
96
An increase in manifold pressure when carburetor heat is applied indicates
overheating of cylinder heads.
Will did something wrong on the engine.
mixture was too lean.
the carburetor had ice that has now melted.
97
Which of the following conditions would most likely lead to detonation?
bad magneto timing.
Use of fuel with too high an octane rating.
Late ignition timing.
Use of fuel with too low an octane rating.
98
When using a timing light on an aircraft engine, the magneto switch should be placed in the
none of these answers are correct.
LEFT or RIGHT position, does not matter.
OFF position.
BOTH position.
99
A rotary-van pump is best described as a
positive-displacement pump.
cooler type pump.
variable-displacement pump.
boost pump.
100
The action of a carburetor air scoop is to supply air to the carburetor, but it may also
increase the pressure of the incoming air by ram effect.
cool the engine.
keep fuel lines cool and prevent vapor lock.
decrease air quality.
101
A fire involving energized electrical equipment is defined as a
Class B fire.
Class C fire.
Class A fire.
Class F fire.
102
Fuel pump relief valves designed to compensate for atmospheric pressure variations are known as
pressurized-relief valves.
balanced-type relief valves.
compensated-flow valves.
unpressurized-relief valves.
103
Fuel crossfeed systems are used in aircraft to
crossfeed to the hydraulic system for cooling.
maintain aircraft stability.
jettison fuel in an emergency.
purge the fuel tanks.
104
How is a supercharger driven?
Ram air pressure
Mechanically off of the crankshaft.
Sheep air pressure.
Exhaust gasses.
105
Advantage of using metallic-sodium filled exhaust valves in aircraft reciprocating engines?
Greater resistance to deterioration at high temperatures.
Stops valve floating at high rpm.
Reduced valve operating temperatures.
Increased strength and resistance to cracking.
106
Which method is commonly used to adjust the level of a float in a float carburetor?
Add or remove shims under the needle-valve seat.
replace the carburetor float.
Lengthening or shortening the float shaft.
Change the angle of the float arm pivot.
107
Which of the following aircraft circuits does NOT contain a fuse/circuit breaker?
Generator circuit.
Air-conditioning circuit.
Starter circuit.
Dale's Jeep.
108
An APU is usually rotated during start by
a pneumatic starter.
hand crank.
an electric starter.
a turbine impingement system.
109
What is the frequency of most aircraft alternating current?
400 Hertz
60 Hertz
412 Hertz
115 Hertz
110
When a "shower of sparks" ignition system is activated at an engine start, a spark plug fires
only while the retard breaker points are open.
as soon as the advance breaker points open.
as soon as the breaker points close.
ONLY: both the retard and advance breaker points are open.
