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Mechanical Engineering :: Compressors, Gas Turbines and Jet Engines

  1. In a reciprocating air compressor, the compression work per kg of air

  2. A.

     Increases as clearance volume increases

    B.

     Decreases as clearance volume increases

    C.

     Is independent of clearance volume

    D.

     Increases as clearance volume decreases


  3. Work ratio of a gas turbine plant is ratio of

  4. A.

     Net work output and work done by turbine

    B.

     Net work output and heat supplied

    C.

     Work done by turbine and heat supplied

    D.

     Work done by turbine and net work output


  5. Actual compression curve is

  6. A.

     Same as isothermal

    B.

     Same as adiabatic

    C.

     Better than isothermal and adiabatic

    D.

     In between isothermal and adiabatic


  7. The ratio of outlet whirl velocity to blade velocity in case of centrifugal compressor is called

  8. A.

     Slip factor

    B.

     Velocity factor

    C.

     Velocity coefficient

    D.

     None of the above


  9. The volume of air delivered by the compressor is called

  10. A.

     Free air delivery

    B.

     Compressor capacity

    C.

     Swept volume

    D.

     None of these


  11. The absolute pressure of air at the outlet of a compressor is called

  12. A.

     Back pressure

    B.

     Critical pressure

    C.

     Discharge pressure

    D.

     None of these


  13. The ratio of work done per cycle to the swept volume in case of compressor is called

  14. A.

     Compression index

    B.

     Compression ratio

    C.

     Compressor efficiency

    D.

     Mean effective pressure


  15. Axial flow compressor resembles

  16. A.

     Centrifugal pump

    B.

     Reciprocating pump

    C.

     Turbine

    D.

     Sliding vane compressor


  17. Cylinder clearance in a compressor should be

  18. A.

     As large as possible

    B.

     As small as possible

    C.

     About 50% of swept volume

    D.

     About 100% of swept volume


  19. The volumetric efficiency for reciprocating air compressors is about

  20. A.

     10 to 40%

    B.

     40 to 60%

    C.

     60 to 70%

    D.

     70 to 90%