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Mechanical Engineering :: Compressors, Gas Turbines and Jet Engines

  1. The ratio of isentropic work to Euler work is known as

  2. A.

     Pressure coefficient

    B.

     Work coefficient

    C.

     Polytropic reaction

    D.

     Slip factor

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  3. The ratio of isentropic work to Euler’s work is known as

  4. A.

     Compressor efficiency

    B.

     Isentropic efficiency

    C.

     Euler

    D.

     Pressure coefficient

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  5. In a single acting reciprocating compressor, the suction, compression and delivery of air takes place in ________ of the piston.

  6. A.

     One stroke

    B.

     Two strokes

    C.

     Three strokes

    D.

     Four strokes

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  7. The overall thermal efficiency of an ideal gas turbine plant is (where r = Pressure ratio)

  8. A.

     r ɣ-1

    B.

     1 - r ɣ-1

    C.

     1 - (1/r) ɣ-1/ɣ

    D.

     1 - (1/r) ɣ/ɣ-1

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  9. What will be the volume of air at 327°C if its volume at 27°C is 1.5 m³/ mt?

  10. A.

     3 m³/ mt.

    B.

     1.5 m³/ mt.

    C.

     18 m³/ mt.

    D.

     6 m³/ mt.

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  11. The capacity of a compressor is 5 m/min refers to

  12. A.

     Standard air

    B.

     Free air

    C.

     Compressed air

    D.

     Compressed air at delivery pressure

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  13. The thermal efficiency of a gas turbine as compared to a diesel plant is

  14. A.

     Same

    B.

     More

    C.

     Less

    D.

     Depends on other factors

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  15. A jet engine has

  16. A.

     No propeller

    B.

     Propeller in front

    C.

     Propeller at back

    D.

     Propeller on the top

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  17. Isothermal compression though most efficient, but is not practicable because

  18. A.

     It requires very big cylinder

    B.

     It does not increase pressure much

    C.

     It is impossible in practice

    D.

     Compressor has to run at very slow speed to achieve it

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  19. The type of rotary compressor used in aeroplanes, is of

  20. A.

     Centrifugal type

    B.

     Axial flow type

    C.

     Radial flow type

    D.

     None of these

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