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Mechanical Engineering :: Compressors, Gas Turbines and Jet Engines

  1. In a high pressure compressor, the delivery pressure is

  2. A.

     1 to 5 bar

    B.

     5 to 8 bar

    C.

     8 to 10 bar

    D.

     10 to 15 bar


  3. The capacity of compressor will be highest when its intake temperature is

  4. A.

     Lowest

    B.

     Highest

    C.

     Anything

    D.

     Atmospheric


  5. It is not possible to use closed gas turbine cycle in aeronautical engines because

  6. A.

     It is inefficient

    B.

     It is bulky

    C.

     It requires cooling water for its operation

    D.

     None of the above


  7. For slow speed large capacity compressor, following type of valve will be best suited

  8. A.

     Poppet valve

    B.

     Mechanical valve of the Corliss, sleeve, rotary or semi rotary type

    C.

     Disc or feather type

    D.

     Any of the above


  9. In a centrifugal compressor, the ratio of the ________ to the blade velocity is called slip factor.

  10. A.

     Inlet whirl velocity

    B.

     Outlet whirl velocity

    C.

     Inlet velocity of flow

    D.

     Outlet velocity of flow


  11. An ideal air compressor cycle without clearance on P-V diagram can be represented by following processes

  12. A.

     One adiabatic, two isobaric, and one constant volume

    B.

     Two adiabatic and two isobaric

    C.

     Two adiabatic, one isobaric and one constant volume

    D.

     One adiabatic, one isobaric and two constant volumes


  13. An ideal air compressor cycle with clearance on P-V diagram can be represented by following processes

  14. A.

     One adiabatic, two isobaric, and one constant volume

    B.

     Two adiabatic and two isobaric

    C.

     Two adiabatic, one isobaric and one constant volume

    D.

     One adiabatic, one isobaric and two constant volumes


  15. A compressor at high altitude will draw

  16. A.

     More power

    B.

     Less power

    C.

     Same power

    D.

     More/less power depending on other factors


  17. In which case the air-fuel ratio is likely to be maximum?

  18. A.

     Gas turbine

    B.

     4-stroke petrol engine

    C.

     4-stroke diesel engine

    D.

     Multi cylinder engine


  19. With the decrease in compression ratio, the volumetric efficiency

  20. A.

     Does not change

    B.

     Increases

    C.

     Decreases

    D.

     First decrease and then increase