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Mechanical Engineering :: Compressors, Gas Turbines and Jet Engines

  1. Pressure ratio in gas turbines is the ratio of

  2. A.

     Compressor pressure ratio

    B.

     Highest pressure to exhaust pressure

    C.

     Inlet pressure to exhaust pressure

    D.

     Pressures across the turbine


  3. The combustion efficiency of a gas turbine using perfect combustion chamber is of the order of

  4. A.

     75%

    B.

     85%

    C.

     90%

    D.

     99%


  5. The compression ratio in a gas turbine is of the order of

  6. A.

     3.5 : 1

    B.

     5 : 1

    C.

     8 : 1

    D.

     12 : 1


  7. The pressure ratio in gas turbines is of the order of

  8. A.

     2: 1

    B.

     4:1

    C.

     61: 1

    D.

     9: 1


  9. Volumetric efficiency of air compressors is of the order of

  10. A.

     20 - 30%

    B.

     40 - 50%

    C.

     60 - 70%

    D.

     70 - 90%


  11. The air-fuel ratio in gas turbines is of the order of

  12. A.

     7: 1

    B.

     15: 1

    C.

     30: 1

    D.

     50: 1.


  13. Maximum delivery pressure is a rotary air compressor is of the order of

  14. A.

     6 kg/cm²

    B.

     10 kg/cm²

    C.

     16 kg/cm²

    D.

     25 kg/cm²


  15. Maximum temperature in a gas turbine is of the order of

  16. A.

     700°C

    B.

     2000°C

    C.

     1500°C

    D.

     1000°C


  17. The maximum compression ratio in an actual single stage axial flow compressor is of the order of

  18. A.

     1 : 1.2

    B.

     1 : 2

    C.

     1 : 5

    D.

     1 : 10


  19. The type of rotary compressor used in gas turbines, is of

  20. A.

     Centrifugal type

    B.

     Axial flow type

    C.

     Radial flow type

    D.

     None of these