GAS TURBINE INLET – Air – DGCA Question Bank For Politics

#1. In a high by-pass engine with a ‘pitot’ intake, with the engine running and the brakes on, what will P1 be in relation to P0?

Same

Greater

Less

14.7psi

#2. A pitot intake forms a ____ duct the fan to ensure that the airflow to and achieves a

convergent before speeds up subsonic pressure rise

divergent after slows down subsonic pressure rise

divergent before speeds up sonic pressure drop

divergent before slows down subsonic pressure rise

#3. What effect will severe icing in the intake have on a high by-pass engine?

The axial velocity of the air will increase with a reduction in the angle of attack of the airflow with the compressor blades and a possible stall.

The axial velocity of the air will decrease with a reduction in the angle of attack of the airflow with the compressor blades and a possible stall.

The axial velocity of the air will decrease with an increase in the angle that the resultant airflow forms with the compressor blades chord line and a possible stall.

The axial velocity of the air will increase with an increase in the angle of attack of the airflow with the compressor blades and a possible stall.

#4. Which of the following would be classed as prudent when carrying out Engine Ground Runs?

Only carry out engine runs with a tail wind

Fit debris guards when running

Only do ground runs on Tarmac

Only do ground runs on concrete

#5. With an ‘S’ type intake, if the pilot selects max RPM while standing still, there is a strong possibility that:

The angle, which the relative airflow forms with the compressor blades, will become too small, which will cause the engine to stall and surge.

The angle, which the relative airflow forms with the compressor blades, will become too small, which will cause the engine to surge then stall.

The angle which the relative airflow forms with the compressor blades will become too large, which will cause the engine to stall and surge.

The angle, which the relative airflow forms with the compressor blades, will become too large, which will cause the engine to surge then stall.

#6. Secondary air inlet doors are utilised:

When an aircraft is in the cruise

When the aircraft is near its maximum IAS.

When the rpm of the engine is low while stationary.

When the rpm of the engine is high when stationary

#7. What is the purpose of the supersonic diffuser in the variable throat intake?

Final reduction in velocity prior to compressor face.

Interim reduction in velocity to below Mach 1 prior to a further reduction in the subsonic diffuser.

Interim reduction in velocity to below Mach .5 prior to a further reduction in the subsonic diffuser.

Increase in velocity prior to compressor face.

#8. The purpose of an air inlet is to provide a relatively supply of air to the of the compressor.

turbulent free face low pressure

turbulent face low pressure

turbulent free rear low pressure

turbulent free face high pressure

#9. In a pitot intake the term ‘Ram Pressure Recovery’ refers to the time when:

EPR has attained the take off setting.

The HP Compressor has reached its maximum.

The EPR has recovered to its optimum figure.

Intake pressure has been re-established to ambient pressure.

#10. The effect on EPR with an iced up P1 probe with the RPM of the engine increasing

EPR would decrease.

No change.

EPR would momentarily decrease then increase.

EPR would increase.

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