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Mechanical Engineering :: Compressors, Gas Turbines and Jet Engines

  1. The ideal efficiency of simple gas turbine cycle depends on

  2. A.

     Pressure ratio

    B.

     Maximum cycle temperature

    C.

     Minimum cycle temperature

    D.

     All of the above


  3. There is a certain pressure ratio (optimum) for a gas turbine at which its thermal efficiency is maximum. With increase in turbine temperature, the value of pressure ratio for the peak efficiency would

  4. A.

     Remain same

    B.

     Decrease

    C.

     Increase

    D.

     None of the above


  5. Ratio of indicated h.p. to shaft h.p. in known as

  6. A.

     Compressor efficiency

    B.

     Isothermal efficiency

    C.

     Volumetric efficiency

    D.

     Mechanical efficiency


  7. Ratio of indicated H.P. and brake H.P. is known as

  8. A.

     Mechanical efficiency

    B.

     Volumetric efficiency

    C.

     Isothermal efficiency

    D.

     Adiabatic efficiency


  9. The output of a gas turbine is 300 KW and its efficiency is 20 percent, the heat supplied is

  10. A.

     6000 KW

    B.

     15 KW

    C.

     600 KW

    D.

     150 KW


  11. Reheating in a gas turbine

  12. A.

     Increases the thermal efficiency

    B.

     Increases the compressor work

    C.

     Increases the turbine work

    D.

     Decreases the thermal efficiency


  13. In axial flow compressor, exit flow angle deviation from the blade angle is a function of

  14. A.

     Blade camber

    B.

     Blade camber and incidence angle

    C.

     Space-chord ratio

    D.

     Blade camber and space-chord ratio


  15. The air power of the compressor is also known as

  16. A.

     Indicated power

    B.

     Brake power

    C.

     Frictional power

    D.

     None of these


  17. To avoid moisture troubles, the compressed air main line should

  18. A.

     Rise gradually towards the point of use

    B.

     Drop gradually towards the point of use

    C.

     Be laid vertically

    D.

     Be laid exactly horizontally


  19. The ratio of the discharge pressure to the inlet pressure of air is called

  20. A.

     Compression ratio

    B.

     Expansion ratio

    C.

     Compressor efficiency

    D.

     Volumetric efficiency