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Mechanical Engineering :: Compressors, Gas Turbines and Jet Engines

  1. Rotary compressors are suitable for

  2. A.

     Large discharge at high pressure

    B.

     Low discharge at high pressure

    C.

     Large discharge at low pressure

    D.

     Low discharge at low pressure


  3. An air compressor may be controlled by

  4. A.

     Throttle control

    B.

     Clearance control

    C.

     Blow off control

    D.

     Any one of the above


  5. The degree of reaction of an axial flow turbine is the ratio of isentropic temperature drop in a blade row to the

  6. A.

     Adiabatic temperature drop in the stage

    B.

     Total temperature drop

    C.

     Total temperature drop in the stage

    D.

     Total adiabatic temperature drop


  7. The net work input required for compressor with increase in clearance volume

  8. A.

     Increases

    B.

     Decreases

    C.

     Remains same

    D.

     Increases/decreases depending on compressor capacity


  9. Volumetric efficiency of a compressor without clearance volume

  10. A.

     Increases with increase in compression ratio

    B.

     Decreases with increase in compression ratio

    C.

     Is not dependent upon compression ratio

    D.

     May increase/decrease depending on compressor capacity


  11. Volumetric efficiency of a compressor with clearance volume

  12. A.

     Increases with increase in compression ratio

    B.

     Decreases with increase in compression ratio

    C.

     In not dependent upon compression ratio

    D.

     May increase/decrease depending on compressor capacity


  13. Compression efficiency is compared against

  14. A.

     Ideal compression

    B.

     Adiabatic compression

    C.

     Isentropic compression

    D.

     Isothermal compression


  15. Phenomenon of choking in compressor means

  16. A.

     No flow of air

    B.

     Fixed mass flow rate regardless of pressure ratio

    C.

     Reducing mass flow rate with increase in pressure ratio

    D.

     Increased inclination of chord with air steam


  17. Reheating in a multistage expansion gas turbine ________ compressor work.

  18. A.

     Has no effect on

    B.

     Decreases

    C.

     Increases

    D.

     None of these


  19. The work ratio of simple gas turbine cycle depends on

  20. A.

     Pressure ratio

    B.

     Maximum cycle temperature

    C.

     Minimum cycle temperature

    D.

     All of the above