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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

  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

  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

  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

  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)

  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

  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

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

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

  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

  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