SAMS Questions (other)

Question 1

A free turbine is usually found on a

Answer 1

Turboprop aircraft

Question 2

A free turbine is

Answer 2

A gas turbine engine with a turbine stage on a shaft independent of the shaft used to drive the compressor

Question 3

The fuel flow in a turboprop engine within the constant speed range is controlled by

Answer 3

FADEC System

(Full Authority Digital Engine Control)

Question 4

Torque measurement is taken from the

Answer 4

main shaft

(instrument = Torquemeter)

Question 5

Fuel trimming on a turboprop engine is controlled by

Answer 5

Fuel Control Unit (FCU)

*Automatically regulates fuel flow

Question 6

What is the purpose of the reduction gear on a propeller driven engine

Answer 6

Slows propeller down

Question 7

If an E.P.R gauge is installed on turbofans as a measure of power output, what is used on a turboprop

Answer 7

Tachometer: Shows the RPM of the compressor in percentage of its rated speed

Question 8

What type of reduction gear is used on most turboprop modern engines

Answer 8

Epicyclic / Planetary gear train

Question 9

A turbo-shaft engine has what type of spool system

Answer 9

Twin spool system

(??????????)

Question 10

On a twin spool turbo-shaft engine, the free turbine is connected to the

Answer 10

Power Output shaft

(On helicopters, this goes through reduction gear system to rotate rotor blades)

Question 11

In the majority of helicopters, the thrust generated by the gas generator is absorbed by the

Answer 11

Turbine

Question 12

An A.P.U automatic shut down is initiated by

Answer 12

ECB = Electronic Control Box

Question 13

An A.P.U start cycle is completed at ___% RPM

Answer 13

95% RPM

Question 14

An A.P.U power lever is located

Answer 14

trick question

APU is a constant speed engine and has no power lever

Question 15

An A.P.U consists of what type of compressors

Answer 15

Centrifugal and axial load compressors

Question 16

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

Answer 16

Opening surge control valve

(Normally used to prevent APU compressor stall)

Question 17

An A.P.U is usually rotated during start by

Answer 17

Ground Pneumatics

(Electric starter motor)

Question 18

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

Answer 18

Up to 10’000 ft

Both Electrical and Pneumatic power can be used

10’000 ft to 17’000 ft

Either Electrical OR Pneumatic power can be used

17’000 ft to 35’000 ft

Electrical Power only

(BEE)

Question 19

When in operation, the speed of an A.P.U ____________ regardless of the load condition

Answer 19

is constant

Question 20

When is the A.P.U at it’s greatest load

Answer 20

When using both electronic and pneumatic power

(only permittable sea level up to 10’000 ft)

Question 21

What is the most important signal when monitoring an A.P.U

Answer 21

EGT

Exhaust Gas Temperature

(This is also one of the factors that will cause automatic APU shutdown if EGT goes too high)