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Mechanical Engineering :: IC Engine and Nuclear Power Plants

  1. The detonating tendency in petrol engines increases with increase of compression ratio.

  2. A.
    True
    B.
    False

  3. Each fission of U235 produces on the average __________ fast neutrons as a product of reaction.

  4. A.
    2.46
    B.
    24.6
    C.
    246
    D.
    2460

  5. Reactors for propulsion applications are designed for

  6. A.
    any form of uranium
    B.
    natura uranium
    C.
    enriched uranium
    D.
    plutonium

  7. The primary fuel used in nuclear power plants is

  8. A.
    U235
    B.
    U238
    C.
    Pu239
    D.
    Pu233

  9. In petrol engine, using a fixed octane rating fuel and fixed compression ratio, supercharging will __________ the knocking tendency.

  10. A.
    not effect
    B.
    decrease
    C.
    increase

  11. Ordinary water is sometimes used as moderator when enriched uranium is used as a fuel in nuclear power plants.

  12. A.
    Yes
    B.
    No

  13. The compensating jet in a carburettor supplies almost constant amount of petrol at all speeds because the

  14. A.
    jet area is automatically varied depending on the suction
    B.
    the flow from the main jet is diverted to the compensating jet with increase in speed
    C.
    the diameter of the jet is constant and the discharge coefficient is invariant
    D.
    flow is produced due to the static head in the float chamber

  15. The effective inhibitor of pre-ignition is

  16. A.
    alcohol
    B.
    water
    C.
    lead
    D.
    none of these

  17. The purpose of testing an internal combustion engine is

  18. A.
    to determine the information, which can not be obtained by calculations
    B.
    to conform the data used in design, the validity of which may be doubtful
    C.
    to satisfy the customer regarding the performance of the engine
    D.
    all of the above

  19. The thermal efficiency of diesel engines is about

  20. A.
    15%
    B.
    30%
    C.
    50%
    D.
    70%