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Gas Turbine Engine Quiz

Total questions: 37

Worksheet time: 19mins

Name
Class
Date
1.

What does a Brayton cycle represent in a gas turbine engine?

a)

Constant volume thermodynamic cycle

b)

Constant pressure thermodynamic cycle

c)

Reversible cycle

2.

What is the difference between Otto cycle and Brayton's Cycle?

a)

Otto cycle happen at different locations at the same time

b)

Otto cycle happen in the same location at different times

c)

Otto Cycle happen at random places within the engine

3.

How is the turbine engine constructed from front to rear?

a)

Exhaust, turbine, compressor, intake

b)

Compressor, combustion, turbine, exhaust

c)

Compressor, turbine, compressor, exhaust

4.

What happens to air in the compressor stage of a gas turbine engine?

a)

Volume and pressure increase

b)

Volume decreases and pressure increases

c)

Volume increases and pressure decreases

5.

Initial rotation of the compressor of a turbine engine is done by the

a)

Starter

b)

Accessory gearbox

c)

Turbine

6.

What is indicated by N1?

a)

HP compressor speed

b)

Fan speed

c)

Exhaust temperature

7.

Reversed thrust on propeller aircraft can be achieved by

a)

Clamshell door system

b)

Reversing the pitch of the propeller

c)

Reversing the rotation of the propeller

8.

What component that control the FMV in the FMU during speed changes?

a)

N2 signal

b)

Pressure sensor

c)

Torque motor

9.

What safety function is included in FADEC's BITE?

a)

Ignites fuel automatically

b)

Detects and isolates faults

c)

Controls cabin temperature

10.

What happens if both ECU channels fail?

a)

Full thrust is maintained

b)

Fuel flow goes to maximum

c)

Fuel flow reduces to minimum

11.

What does the engine interface unit (EIU) do?

a)

Supplies fuel

b)

Transfers data between ECU and aircraft

c)

Controls flight surfaces

12.

What does Newton's third law explain in jet propulsion?

a)

Lift creation

b)

Gravity effects

c)

Thrust as reaction force

13.

What is the function of a reduction gearbox in a turboprop engine?

a)

Increase propeller RPM

b)

Synchronize engine and fan speed

c)

Reduce turbine RPM to suitable propeller RPM

14.

What kind of turbine is commonly used in turboshaft engines for output?

a)

Free turbine

b)

Single-stage turbine

c)

Fan turbine

15.

Where is the ECU commonly located in a jet engine?

a)

Combustion chamber

b)

Fan stator case

c)

Exhaust nozzle

16.

How does the FADEC ECU determine engine type?

a)

Using T12 signal

b)

Using thrust lever input

c)

Via thrust rating plug

17.

What electrical source often powers the ECU during engine operation?

a)

Battery

b)

External GPU

c)

Permanent magnet alternator

18.

What is the function of governing section in the ECU?

a)

Calculate the thrust command

b)

Make sure the engine limit is not exceeded

c)

Compare thrust command signal with actual N1

19.

What component compresses the air before it enters the combustion chamber in a gas turbine engine?

a)

Turbine

b)

Compressor

c)

Nozzle

20.

In a turbojet engine, what component extracts energy from the expanding gases?

a)

Intake

b)

Combustion chamber

c)

Turbine

21.

How is thrust generated in a turbojet engine?

a)

By heating the fuel

b)

By increasing exhaust gas velocity

c)

By rotating the fan

22.

What distinguishes a turboprop engine from a turbojet engine?

a)

It uses bypass air

b)

It has a reduction gearbox for driving a propeller

c)

It has no combustion chamber

23.

What is the main function of the free turbine in a turboshaft engine?

a)

Compress air

b)

Drive the fan

c)

Deliver power to a shaft

24.

What is bypass ratio in a turbofan engine?

a)

Ratio of thrust to drag

b)

Ratio of core to fan pressure

c)

Ratio of bypass air to core air

25.

What is a typical bypass ratio in modern turbofan engines?

a)

1:1

b)

2:1 to 3:1

c)

4:1 to 9:1

26.

Which component of the FADEC system issues commands to control fuel flow?

a)

ECU

b)

FMU

c)

EIU

27.

Which unit in a FADEC system contains the fuel metering valve?

a)

EIU

b)

FMU

c)

ECU

28.

What is the function of the ECU in a FADEC system?

a)

Supply fuel to the engine

b)

Control all engine functions

c)

Control the aircraft cabin environment

29.

How does the FADEC ensure redundancy in its operation?

a)

By using a dual FMU

b)

By using two computers Channel A and B

c)

By using hydraulic backups

30.

What parameter does the thrust rating plug define?

a)

Airspeed limits

b)

Engine life

c)

maximum take-off thrust

31.

What happens when one FADEC channel detects invalid sensor data?

a)

Engine shutdown

b)

ECU continues using backup logic or switches channel

c)

Engine switches to manual control

32.

Which component in FADEC converts pressure into digital signals?

a)

Thermistor

b)

Transducer

c)

Alternator

33.

What happens to fuel flow if both FADEC channels fail?

a)

Maximum fuel flow

b)

Fuel flow stops

c)

Fuel flow reduces to minimum

34.

Which unit reduces fuel flow in the event of an ECU overspeed protection failure?

a)

Thermocouple

b)

Bypass valve

c)

Overspeed governor

35.

What is the function of the EIU in a FADEC system?

a)

Control engine start

b)

Interface between ECU and aircraft systems

c)

Provide lubrication

36.

What is the main advantage of modular construction engine?

a)

Enables section of an engine to be replaced without disassembling the complete engine

b)

Saves weight due to smaller frontal or forward section area.

c)

Produces approximately 15% more thrust than the conventional one piece engine

37.

When is the ECU channel switch over from one channel to the other?

a)

After aircraft take off

b)

Before aircraft landing

c)

Beginning of engine start