1) If the swash plate of a positive displacement swash plate pump is perpendicular to the axis of the pump, the flow will be Report

reversed

zero

maximum

2) What moves the swash plate away from the minimum stroke position? Report

A spring

Reduced inlet pressure

Increased servo pressure

3) The burner fuel flow is at maximum at Report

altitude

I.S.A. sea level

10^oCentigrade above I.S.A. sea level

4) How is servo pressure, which is used to control fuel pump 'Swash Plate' angle obtained? Report

From pump delivery pressure through variable restrictions

From pump delivery pressure through fixed restrictions

From pump inlet pressure through fixed restrictions

5) What would be the effect on the engine if the B.P.C half ball valve in the servo line sticks open? Report

A reduction of fuel flow, therefore a decrease in RPM

The B.P.C would be ineffective at sea level only

An increase of fuel flow, therefore an increase in RPM

6) Why is an A.C.U fitted to a gas turbine engine? Report

It increases the rate of acceleration of the engine

It controls the operation of the metering block during sudden acceleration

It limits the rate of increase in fuel flow during sudden acceleration

7) If fuel pump servo pressure is reduced, pump output will Report

increase

decrease

remain constant

8) Why is the B.P.C fitted in a gas turbine engine fuel system? Report

To vary pressure pump output in relation to the pressure variation at the intake

To proportion the fuel flow between primary and main burner lines

To decrease the fuel flow to the burners with increased air intake pressure

9) What must be done after the fuel control unit has been replaced on an aircraft gas turbine engine? Report

You must recalibrate the fuel nozzles

You must retrim the engine

You must perform a full power engine run to check fuel flow

10) A kinetic valve is a device used to control H.P pump output. This is achieved by movement of a Report

needle valve

knife blade

diaphragm and half ball valve

11) Specific fuel consumption at altitude will Report

decrease

increase

remain constant

12) During any stabilised running condition, the spill or half ball valve is Report

lightly seated

fully closed

fully open

13) What is the purpose of the attenuator fitted between the H.P fuel pump and the B.P.C in a fuel system? Report

It restricts the pressure feed top the B.P.C

It ensures a supply of fuel free from foreign matter to the BC half ball valve

It damps out pulsations in the fuel delivery to the B.P.C

14) Why is the hydromechanical governor fitted to a gas turbine engine fuel pump? Report

To enable the engine to operate over a wide range of fuel SGs

To enable efficient control of fuel flow to be maintained at altitude

To enable the engine to operate over a wide range of fuel flow

15) A barometric Pressure Controller controls Report

barometric pressure

fuel tank pressure at altitude

fuel flow to suit atmospheric pressure changes

16) Kinetic valves are used because Report

they are less likely to leak

they are more sensitive

they are not subjected to wear

17) When considering a centrifugal type engine speed governor, an increase in fuel S.G. will cause Report

no change in maximum RPM

an increase in maximum RPM

a reduction in maximum RPM

18) On a FADEC engine Report

A channel uses control alternator and B channel uses aircraft bus power

A channel uses a separate winding of the control alternator to B channel

A and B channel use the same phases of the motor

19) Normal fuel/air ratio for successful combustion is Report

10:1

15:1

25:1

20) Which of the following influences the operation of an automatic fuel control unit on a turbojet engine? Report

Exhaust gas temperature

Mixture control position

Burner pressure

EASA Questions Mod 15: Gas Turbine Engine Set 11: Fuel Systems

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