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PP Auxilliary Power Units

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Question 1 of 10

1. Question
Frequently, an aircraft’s auxiliary power unit (APU) generator
- is identical to the engine-driven generators.
- supplements the aircraft's engine-driven generators during peak loads.
- has a higher load capacity than the engine-driven generators.
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Question 2 of 10

2. Question
Fuel is normally supplied to an APU from the
- APU independent fuel tank.
- airplane's header fuel tank.
- airplane's main fuel tank.
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Question 3 of 10

3. Question
An APU is usually rotated during start by
- a turbine impingement system.
- a pneumatic starter.
- an electric starter.
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Question 4 of 10

4. Question
The function of an APU air inlet plenum is to
- increase the velocity of the air before entering the compressor.
- decrease the pressure of the air before entering the compressor.
- stabilize the pressure of the air before it enters the compressor.
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Question 5 of 10

5. Question
When in operation, the speed of an APU
- is controlled by a cockpit power lever.
- remains at idle and automatically accelerated to rated speed when placed under load.
- remains at or near rated speed regardless of the load condition.
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Question 6 of 10

6. Question
Generally, when maximum APU shaft output power is being used in conjunction with pneumatic power
- pneumatic loading will be automatically modulated to maintain a safe EGT.
- electrical loading will be automatically modulated to maintain a safe EGT.
- temperature limits and loads must be carefully monitored by the operator to maintain a useful EGT.
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Question 7 of 10

7. Question
When necessary, APU engine cooling before shutdown may be accomplished by
- unloading the generator(s).
- closing the bleed air valve.
- opening the bleed air valve.
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Question 8 of 10

8. Question
Usually, most of the load placed on an APU occurs when
- an electrical load is placed on the generator(s).
- the bleed air valve is opened.
- the bleed air valve is closed.
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Question 9 of 10

9. Question
Fuel scheduling during APU start and under varying pneumatic bleed and electrical loads is maintained
- manually through power control lever position.
- automatically by the APU fuel control system.
- automatically by an aircraft main engine fuel control unit.
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Question 10 of 10

10. Question
On APU’s equipped with a free turbine and load compressor, the primary function of the load compressor is to
- provide air for combustion and cooling in the engine gas path.
- provide bleed air for aircraft pneumatic systems.
- supply the turning force for operation of the APU generator(s).
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