27 Gas Turbines Bleed Air – LMS

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📄 Notes ⚡ Cheat Sheet

Q1. The heat for the anti-icing system of a turbofan engine intake is provided by:

the electrical system of the aircraft.

a dedicated generator on the gearbox of that engine.

bleed air from the HP compressor.

bleed air from the LP compressor.

Q2. Ice formation on turbofan engine intakes is usually:

removed by using electrical heating.

prevented by using turbine bleed air.

prevented by using compressor bleed air.

removed by using pneumatic boots.

Q3. The selection of bleed air to “ON” will cause:

a decrease in power and an increase in exhaust temperature

an increase in exhaust temperature, gas generator speed and power

a decrease in gas generator RPM with no change in power or exhaust temperatures

a reduction of torque and gas generator RPM with an increase of exhaust temperature

Q4. Bleeding air from the HP compressor of a turbofan, whilst maintaining thrust, increases:

EGT and N1.

EGT and fuel flow.

HP compressor discharge pressure and N2.

N2 and fuel flow.

Q5. A gas turbine engine is run at ground idle for a period of time prior to shutdown to:

allow the engine oil to cool.

prevent seizure of the engine bearings.

prevent seizure of the rotor blades in their seals.

prevent vapour lock in the fuel control and/or fuel lines.

Q6. The take off of a jet aeroplane may be performed with “reduced thrust” in order to:

save fuel.

reduce maintenance costs.

reduce the risk of engine failure during take-off.

reduce take-off noise.

Q7. The purpose of gas turbine engine trending is:

to assess engine condition using non-destructive inspection.

to obtain a timely indication when an engine requires to be shut down due to problems.

to collect metal particles from the oil system.

to enhance maintenance planning and detect anomalies.

Q8. On landing and prior to shut down, a gas turbine engine should be run at “GROUND IDLE” for a short period. This allows:

the engine to be compressor washed

cool oil flushing of bearings, particularly those in the turbines

the turbine blade temperature to reduce only

the core temperature to diminish

Q9. Which of the following statements is UNTRUE?

c) Engine bleed air is considered to be high presssure

d) Use of engine bleed air reduces thrust

a) Bleed air may be supplied by an APU

b) Bleed air may be taken from the HP compressor of a gas turbine engine

Q10. One of the purposes of the bleed valves fitted to axial flow compressors is to:

b) control the acceleration time of the engine

d) enable an external air supply to spin up the compressor for engine starting

a) spill compressor air should the engine overspeed thus controlling the speed

c) reduce the tendency to compressor stall

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