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Mechanical Engineering :: IC Engine and Nuclear Power Plants

  1. The cetane number of diesel oil, generally available, is

  2. A.
    20 to 25
    B.
    25 to 30
    C.
    30 to 40
    D.
    40 to 55

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  3. The object of providing masked inlet valve in the air passage of compression ignition engines is to

  4. A.
    enhance flow rate
    B.
    control air flow
    C.
    induce primary swirl
    D.
    induce secondary turbulence

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  5. During suction stroke of a four stroke petrol engine, the inlet valve opens and the charge is sucked into the cylinder as the piston moves upwards from the bottom dead centre.

  6. A.
    True
    B.
    False

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  7. The power actually developed by the engine cylinder of an I.C. engine is known as

  8. A.
    theoretical power
    B.
    actual power
    C.
    indicated power
    D.
    none of these

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  9. A nuclear reactor is said to be critical when the neutron population in the reactor core is

  10. A.
    rapidly increasing leading to the point of explosion
    B.
    decreasing from the specified value
    C.
    reduced to zero
    D.
    constant

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  11. In diesel engines, the ignition takes place due to the heat produced in the engine cylinder at the end of compression.

  12. A.
    Correct
    B.
    Incorrect

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  13. The fuels in order of decreasing knock tendency for spark ignition engines are

  14. A.
    paraffins, aromatics, napthenes
    B.
    paraffins, napthenes, aromatics
    C.
    napthenes, aromatics, paraffins
    D.
    napthenes, paraffins, aromatics

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  15. The ratio of the work obtained at the crankshaft in a given time to the energy supplied during the same time is called

  16. A.
    mechanical efficiency
    B.
    overall efficiency
    C.
    indicated thermal efficiency
    D.
    volumetric efficiency

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  17. Plutonium (Pu239) is produced

  18. A.
    artificially
    B.
    by fission of Th232
    C.
    when U238 is irradiated by neutrons
    D.
    as basic raw material

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  19. A petrol engine has compression ratio from

  20. A.
    6 to 10
    B.
    10 to 15
    C.
    15 to 25
    D.
    25 to 40

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