Gas Turbines - Air Inlets: DGCA Technical General questions

Question 1

In a high bypass engine with a pitot intake, with the engine running and the brakes on, what will P1 be in relation to P0?

Accepted Answer

Less.

Answer

Same.

Answer

Greater.

Answer

14.7 psi.

Question 2

In a pitot intake the term Ram Pressure Recovery refers to the time when:

Accepted Answer

Intake pressure has been re-established to ambient pressure.

Answer

EPR has attained the take-off setting.

Answer

The HP Compressor has reached its maximum.

Answer

The EPR has recovered to its optimum figure.

Question 3

A pitot intake forms a _____ duct _____ the fan to ensure that the airflow _____ to _____ and achieves a _____.

Accepted Answer

Divergent / before / slows down / subsonic / pressure rise.

Answer

Convergent / before / speeds up / subsonic / pressure rise.

Answer

Divergent / after / slows down / subsonic / pressure rise.

Answer

Divergent / before / speeds up / sonic / pressure drop.

Question 4

With an S type intake, if the pilot selects max rpm while standing still, there is a strong possibility that:

Accepted Answer

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

Answer

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

Answer

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

Answer

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

Question 5

What effect will severe icing in the intake have on a high bypass engine?

Accepted Answer

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.

Answer

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.

Answer

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.

Answer

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.

Gas Turbines - Air Inlets: DGCA Technical General questions

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