NOTE
TO CHECK YOUR PREPARATION ,PLZ WRITE DOWN YOUR SELECTED OPTIONS (A,B,C) ON ROUGH PAGE AND AT THE END OF QUIZ , VERIFY YOUR SELECTED OPTIONS WITH THE CORRECT OPTIONS GIVEN BELOW
1. A bypass engine LP compressor.
A. supplies less air than is required for combusti15.4 Compressors
B. supplies more air than is required for combustion.
C. supplies only the required quantity for combustion.
2. How does a dual axial flow compressor improve the efficiency of a turbojet engine?.
A. The velocity of the air entering the combustion chamber is increased.
B. More turbine wheels can be used.
C. Higher compression ratios can be obtained.
3. In a reverse flow system, the last stage of an axial flow compressor is often centrifugal. This is to.
A. provide initial turning of the airflow.
B. prevent compressor surge.
C. increase the temperature rise.
4. What are the two main functional components in a centrifugal compressor?.
A. Bucket and expander.
B. Impeller and diffuser.
C. Turbine and compressor.
5. A bypass ratio of 5:1 indicates that the bypass flow is.
A. equal to 1/5 of the hot stream.
B. five times the hot stream.
C. five times the cold stream.
6. The stator vanes in an axial-flow compressor.
A. direct air into the first stage rotor vanes at the proper angle.
B. convert velocity energy into pressure energy.
C. convert pressure energy onto velocity energy.
7. What units in a gas turbine engine aid in stabilisation of the compressor during low thrust engine operations?.
A. Bleed air valves.
B. Stator vanes.
C. Inlet guide vanes.
8. 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.
9. During the high RPM range on an axial flow gas turbine engine, in what position are the variable intake guide vanes and bleed valves?.
A. At maximum swirl position, bleed valves open.
B. At minimum swirl position, bleed valves closed.
C. At maximum swirl position, bleed valves closed.
10. What is the purpose of the diffuser section in a turbine engine?.
A. To convert pressure to velocity.
B. To reduce pressure and increase velocity.
C. To increase pressure and reduce velocity.
ABOVE QUESTIONS WITH ANSWERS
1. A bypass engine LP compressor.
A. supplies less air than is required for combusti15.4 Compressors
B. supplies more air than is required for combustion.
C. supplies only the required quantity for combustion.
Ans : supplies more air than is required for combustion.
Explanation: By definition the bypass duct sends air around the combustion chamber.
2. How does a dual axial flow compressor improve the efficiency of a turbojet engine?.
A. The velocity of the air entering the combustion chamber is increased.
B. More turbine wheels can be used.
C. Higher compression ratios can be obtained.
Ans : Higher compression ratios can be obtained.
Explanation: Jeppesen A&P Powerplant Textbook 3-13.
3. In a reverse flow system, the last stage of an axial flow compressor is often centrifugal. This is to.
A. provide initial turning of the airflow.
B. prevent compressor surge.
C. increase the temperature rise.
Ans : provide initial turning of the airflow.
Explanation: Rolls Royce The Jet engine Page 5 refers.
4. What are the two main functional components in a centrifugal compressor?.
A. Bucket and expander.
B. Impeller and diffuser.
C. Turbine and compressor.
Ans : Impeller and diffuser.
Explanation: Jeppesen A&P Powerplant Textbook 3-13.
5. A bypass ratio of 5:1 indicates that the bypass flow is.
A. equal to 1/5 of the hot stream.
B. five times the hot stream.
C. five times the cold stream.
Ans : five times the hot stream.
Explanation: Rolls Royce The Jet Engine page 16/17 refers.
6. The stator vanes in an axial-flow compressor.
A. direct air into the first stage rotor vanes at the proper angle.
B. convert velocity energy into pressure energy.
C. convert pressure energy onto velocity energy.
Ans : convert velocity energy into pressure energy.
Explanation: Rolls Royce The Jet Engine page 25 refers.
7. What units in a gas turbine engine aid in stabilisation of the compressor during low thrust engine operations?.
A. Bleed air valves.
B. Stator vanes.
C. Inlet guide vanes.
Ans : Bleed air valves.
Explanation: Rolls Royce The Jet Engine page 31 refers.
8. 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.
9. During the high RPM range on an axial flow gas turbine engine, in what position are the variable intake guide vanes and bleed valves?.
A. At maximum swirl position, bleed valves open.
B. At minimum swirl position, bleed valves closed.
C. At maximum swirl position, bleed valves closed.
Ans : At minimum swirl position, bleed valves closed.
Explanation: Rolls Royce The Jet Engine page 29-31 refers.
10. What is the purpose of the diffuser section in a turbine engine?.
A. To convert pressure to velocity.
B. To reduce pressure and increase velocity.
C. To increase pressure and reduce velocity.
Ans : To increase pressure and reduce velocity.
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