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Mechanical Engineering :: IC Engine and Nuclear Power Plants

  1. In a four stroke cycle petrol engine, the expansion

  2. A.
    starts at top dead centre and ends at bottom dead centre
    B.
    starts at 30° before top dead centre and ends at 50° before bottom dead centre
    C.
    starts at 30° after top dead centre and ends at 50° after bottom dead centre
    D.
    may start and end anywhere

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  3. A fuel of an octane number rating of 75 matches in knocking intensity as a mixture of

  4. A.
    75% iso-octane and 25% normal heptane
    B.
    75% normal heptane and 25% iso-octane
    C.
    75% petrol and 25% diesel
    D.
    75% diesel and 25% petrol

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  5. A two stroke cycle engine gives __________ the number of power strokes as compared to the four stroke cycle engine, at the same engine speed.

  6. A.
    half
    B.
    same
    C.
    double
    D.
    four times

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  7. By higher octane number of spark ignition fuel, it is meant that the fuel has

  8. A.
    higher heating value
    B.
    higher flash point
    C.
    lower volatility
    D.
    longer ignition delay

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  9. The spark ignition engines are governed by

  10. A.
    hit and miss governing
    B.
    qualitative governing
    C.
    quantitative governing
    D.
    combination of (b) and (c)

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  11. If petrol is used in a diesel engine, then

  12. A.
    low power will be produced
    B.
    efficiency will be low
    C.
    higher knocking will occur
    D.
    black smoke will be produced

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  13. The sensing element in the control system of nuclear reactors measure the __________ of the neutron flux in the reactor.

  14. A.
    temperature
    B.
    volume
    C.
    density
    D.
    none of these

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  15. If the temperature of intake air in internal combustion engine increases, then its efficiency will

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

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  17. In a coil ignition system of petrol engines, a condenser is connected across the contact-breaker in order to

  18. A.
    prevent sparking across the gap between the points
    B.
    cause more rapid break of the primary current, giving a higher voltage in the secondary circuit
    C.
    both (a) and (b)
    D.
    none of the above

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  19. Which of the following statement is correct regarding normal cetaine?

  20. A.
    It is a standard fuel used for knock rating of diesel engines.
    B.
    Its chemical name is normal-hexadecane.
    C.
    It has long carbon chain structure.
    D.
    all ofthe above

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