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Mechanical Engineering :: IC Engine and Nuclear Power Plants

  1. Enriched uranium is required as a fuel in a nuclear reactor, if light water is used as moderator and coolant, because light water has

  2. A.
    high neutron absorption cross-section
    B.
    low moderating efficiency
    C.
    high neutron scatter cross-section
    D.
    low neutron absorption cross-section

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  3. As compared to air standard cycle, in actual working, the effect of variation in specific heats is to

  4. A.
    increase maximum pressure and maximum temperature
    B.
    reduce maximum pressure and maximum temperature
    C.
    increase maximum pressure and decrease maximum temperature
    D.
    decrease maximum pressure and increase maximum temperature

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  5. The __________ engines can work on very lean mixture of fuel.

  6. A.
    spark ignition
    B.
    compression ignition

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  7. The ignition quality of petrol is expressed by

  8. A.
    cetane number
    B.
    octane number
    C.
    calorific value
    D.
    all of these

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  9. The fuel valve in a four stroke cycle diesel engine

  10. A.
    opens at 15° after top dead centre and closes at 20° before bottom dead centre
    B.
    opens at 15° before top dead centre and closes at 20° after top dead centre
    C.
    opens at top dead centre and closes at bottom dead centre
    D.
    may open and close anywhere

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  11. In petrol engines, advancing of the spark timing will __________ the knocking tendency.

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

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  13. The knocking tendency in compression ignition engines for a given fuel will be

  14. A.
    enhanced by decreasing compression ratio
    B.
    enhanced by increasing compression ratio
    C.
    dependent on other factors
    D.
    none of the above

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  15. In a four stroke cycle engine, the sequence of operations is

  16. A.
    suction, compression, expansion and exhaust
    B.
    suction, expansion, compression and exhaust
    C.
    expansion, compression, suction and exhaust
    D.
    compression, expansion, suction and exhaust

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  17. Diesel as compared to petrol is

  18. A.
    highly ignitable
    B.
    more difficult to ignite
    C.
    less difficult to ignite
    D.
    none of these

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  19. The first nuclear power plant in India was located at

  20. A.
    Kota
    B.
    Tarapur
    C.
    Bareilly
    D.
    none of these

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