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Mechanical Engineering :: IC Engine and Nuclear Power Plants

  1. In a four stroke cycle diesel engine, the compression

  2. A.
    starts at 40° after bottom dead centre and ends at 10° before top dead centre
    B.
    starts at 40° before top dead centre and ends at 40° after top dead centre
    C.
    starts at top dead centre and ends at 40° before bottom dead centre
    D.
    may start and end anywhere

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  3. In a four stroke cycle diesel engine, the inlet valve

  4. A.
    opens at 20° before top dead centre and closes at 40° after bottom dead centre
    B.
    opens at 20° after top dead centre and closes at 20° before bottom dead centre
    C.
    opens at top dead centre and closes at bottom dead centre
    D.
    may open and close anywhere

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  5. The knocking in diesel engines may be prevented by

  6. A.
    reducing the delay period
    B.
    raising the compression ratio
    C.
    increasing the inlet pressure of air
    D.
    all of these

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  7. The loud pulsating noise heard within the cylinder of an internal combustion engine is known as

  8. A.
    detonation
    B.
    turbulence
    C.
    pre-ignition
    D.
    supercharging

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  9. The air-fuel ratio of the petrol engine is controlled by

  10. A.
    carburettor
    B.
    injector
    C.
    governor
    D.
    none of these

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  11. If the compression ratio in I.C. engine increases, then its thermal efficiency will

  12. A.
    decrease
    B.
    increase
    C.
    remain same

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  13. The relative efficiency of an I.C. engine is the ratio of the indicated thermal efficiency to the air standard efficiency.

  14. A.
    Correct
    B.
    Incorrect

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  15. The volumetric efficiency ofa well designed engine may be

  16. A.
    30 to 40%
    B.
    40 to 60%
    C.
    60 to 70%
    D.
    75 to 90%

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  17. Which of the following statement is correct regarding the features of a Breeder reactor?

  18. A.
    It produces more fuel than it consumes.
    B.
    It requires highly enriched fuel.
    C.
    It requires liquid sodium metal as moderator.
    D.
    all of the above

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  19. A long delay period in compression ignition engines gives a more rapid rise in pressure which causes knocking.

  20. A.
    Yes
    B.
    No

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