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41. Variable inlet guide vanes prevent.
A. compressor runaway.
B. engine flame out at high speed.
C. compressor stalling.
42. An axial flow compressor surges when.
A. later stages are stalled.
B. all stages are stalled.
C. early stages are stalled.
43. As a consequence of tapping air from the compressor, the TGT will.
A. fall.
B. remain constant.
C. rise.
44. Compressor air bleeds promote the flow of air through the early stages by.
A. opening to allow air in.
B. closing.
C. opening to allow air out.
45. .Compressor blades have a reduced angle of attack at the tips.
A. to prevent turbine stall.
B. to increase the velocity.
C. to allow uniform axial velocity.
46. Compressor surge is caused by.
A. over fuelling.
B. rapid closing of the throttle.
C. prolonged engine running at high RPM.
47. Pressure rise across a single spool axial flow compressor is in the order of.
A. four to one.
B. two to one.
C. up to fifteen to one.
48. What purpose do the diffuser vanes of a centrifugal compressor serve?.
A. To convert pressure energy into kinetic energy.
B. To increase the air velocity.
C. To convert kinetic energy into pressure energy.
49. The purpose of the rotating guide vanes on a centrifugal compressor is to.
A. direct the air smoothly into the impeller.
B. provide initial diffusing of the air.
C. prevent damage by solid objects.
50. What is the surge margin of an axial flow compressor?.
A. The margin between the compressor working line and the surge line.
B. The margin between minimum and maximum pressure ratio obtained at constant RPM.
C. The margin between the stall condition and the surge condition.
ABOVE QUESTIONS WITH ANSWERS
41. Variable inlet guide vanes prevent.
A. compressor runaway.
B. engine flame out at high speed.
C. compressor stalling.
Ans : compressor stalling.
Explanation: Jeppesen Gas Turbine Powerplant Page 8-1 Refers.
42. An axial flow compressor surges when.
A. later stages are stalled.
B. all stages are stalled.
C. early stages are stalled.
Ans : all stages are stalled.
Explanation: The definition of a surge is when all stages are stalled and flow reversal occurs.
43. As a consequence of tapping air from the compressor, the TGT will.
A. fall.
B. remain constant.
C. rise.
Ans : rise.
Explanation: When a bleed valve opens it is always accompanied by a rise in TGT of 15-30 degrees.
44. Compressor air bleeds promote the flow of air through the early stages by.
A. opening to allow air in.
B. closing.
C. opening to allow air out.
Ans : opening to allow air out.
Explanation: Jeppesen Gas Turbine Powerplant Page 8-7 refers.
45. .Compressor blades have a reduced angle of attack at the tips.
A. to prevent turbine stall.
B. to increase the velocity.
C. to allow uniform axial velocity.
Ans : to allow uniform axial velocity.
Explanation: Jeppesen Gas Turbine Powerplant Page 3-16 refers.
46. Compressor surge is caused by.
A. over fuelling.
B. rapid closing of the throttle.
C. prolonged engine running at high RPM.
Ans : over fuelling.
Explanation: Jeppesen Gas Turbine Powerplant Page 3-26 refers to fuel system malfunction – over fuelling.
47. Pressure rise across a single spool axial flow compressor is in the order of.
A. four to one.
B. two to one.
C. up to fifteen to one.
Ans : up to fifteen to one.
Explanation: Rolls Royce The Jet Engine page 15 refers.
48. What purpose do the diffuser vanes of a centrifugal compressor serve?.
A. To convert pressure energy into kinetic energy.
B. To increase the air velocity.
C. To convert kinetic energy into pressure energy.
Ans : To convert kinetic energy into pressure energy.
Explanation: NIL.
49. The purpose of the rotating guide vanes on a centrifugal compressor is to.
A. direct the air smoothly into the impeller.
B. provide initial diffusing of the air.
C. prevent damage by solid objects.
Ans : provide initial diffusing of the air.
Explanation: Rolls Royce The Jet Engine page 21 refers.
50. What is the surge margin of an axial flow compressor?.
A. The margin between the compressor working line and the surge line.
B. The margin between minimum and maximum pressure ratio obtained at constant RPM.
C. The margin between the stall condition and the surge condition.
Ans : The margin between the compressor working line and the surge line.
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