1) An A.P.U has Report

automatically controlled thrust and is self contained

variable speed and is self contained

constant speed and is self contained

2) An A.P.U shut down is initiated by Report

high oil pressure, fire warning, hot oil temperature

low oil pressure, fire warning, hot oil temperature

low oil pressure, fire warning

3) An A.P.U start cycle is completed at Report

75% RPM

95% RPM

100% RPM

4) An A.P.U power lever is located Report

behind the throttles

at the Flight Engineer Station

An A.P.U is fully automatic and does not require a power lever

5) An A.P.U consists of Report

a power compressor and load compressor

a power compressor and directly connected turbine

a load compressor and free turbine

6) When necessary, A.P.U engine cooling before shutdown may be accomplished by Report

closing the bleed air valve

opening the bleed air valve

unloading the generator(s).

7) Frequently, an aircraft's auxiliary power unit (A.P.U) generator Report

is identical to the engine-driven generators

has a higher load capacity than the engine-driven generators

supplements the aircraft's engine-driven generators during peak loads

8) Fuel scheduling during A.P.U start and under varying pneumatic bleed and electrical loads is maintained Report

automatically by the A.P.U fuel control system

manually through power control lever position

none of the above

9) An A.P.U is usually rotated during start by Report

a pneumatic starter

an electric starter

a turbine impingement system

10) Usually, most of the load placed on an A.P.U occurs when Report

the bleed air valve is opened

an electrical load is placed on the generator(s)

the bleed air valve is closed

11) The function of an A.P.U air inlet plenum is to Report

stabilize the pressure of the air before it enters the compressor

increase the velocity of the air before entering the compressor

decrease the pressure of the air before entering the compressor

12) In a large commercial passenger transport aircraft the A.P.U supplies Report

electrics

pneumatics

pneumatics and electrics

13) When in operation, the speed of an A.P.U Report

remains at or near rated speed regardless of the load condition

remains at idle and automatically accelerates to rated speed when placed under load

is controlled by a cockpit power lever

14) Generally, when maximum A.P.U shaft output power is being used in conjunction with pneumatic power Report

electrical loading will be automatically modulated to maintain a safe E.G.T

temperature limits and loads must be carefully monitored by the operator to maintain a safe E.G.T

pneumatic loading will be automatically modulated to maintain a safe E.G.T

15) For an A.P.U to run 'unmanned' it must be equipped with Report

an automatic fire extinguishing system

an audible fire warning

both an audible fire warning and an automatic fire extinguishing system

16) An A.P.U is Report

a self contained constant speed gas turbine engine

a reserved engine in case of a main engine failure

a self contained variable speed gas turbine engine

17) When the A.P.U is running and pneumatics are on Report

bleed valve is closed, surge valve is open

bleed valve is open, surge valve is closed

bleed valve is open, surge valve is modulating

18) When is the A.P.U at its greatest load? Report

With bleeds closed

With generator loads on line

With bleeds open and with generator loads on line

19) Auxiliary power units provide Report

hydraulic and electrical power

pneumatic and electrical power

hydraulic and pneumatic power

20) When starting an A.P.U what would the normal duty cycle be on a modern aircraft? Report

6 attempted starts per half hour with 5 minutes between attempts

3 attempted starts per hour with 5 minutes between each attempt

6 attempted starts per hour with 5 minutes between attempts

EASA Questions Mod 15: Gas Turbine Engine Set 18: Apu

Set 1: Fundamentals

Set 2: Engine Performance

Set 3: Engine Inlet

Set 4: Eng. compressors

Set 5: Combustion Section

Set 6: Turbine Section

Set 7: Engine Exhaust

Set 8: Bearing and Seals

Set 9: Lubricants and Fuel

Set 10: Lubrication system

Set 11: Fuel Systems

Set 12: Air Systems

Set 13: Ignition Systems

Set 14: Engine Indication

Set 15: Power Augmentation

Set 16:Turboprop engines

Set 17: Turboshaft

Set 18: APU

Set 19:Powerplant Installation

Set 20: Fire Protection

Set 21:Engine Monitoring

Set 22: Engine Storage