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Internal Combustion Engines - section-1
  1. Fuel oil consumption guarantees for I .C. engine are usually based on

    2. A.

     Low heat value of oil
    B.

     High heat value of oil
    C.

     Net calorific value of oil
    D.

     Calorific value of fuel

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  2. The thermal efficiency of diesel engines on weak mixtures is

    3. A.

     Unaffected
    B.

     Lower
    C.

     Higher
    D.

     Dependent on other factors

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  3. In compression ignition engines, swirl denotes a

    4. A.

     Haphazard motion of the gases in the chamber
    B.

     Rotary motion of the gases in the chamber
    C.

     Radial motion of the gases in the chamber
    D.

     None of the above

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  4. In a four stroke cycle diesel engine, the compression

    5. A.

     Starts at 40° after bottom dead center and ends at 10° before top dead center
    B.

     Starts at 40° before top dead center and ends at 40° after top dead center
    C.

     Starts at top dead center and ends at 40° before bottom dead center
    D.

     May start and end anywhere

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  5. In a four stroke cycle petrol engine, the compression

    6. A.

     Starts at 40° after bottom dead centre and ends at 30° before top dead centre
    B.

     Starts at 40° before bottom dead centre and ends at 30° after bottom dead centre
    C.

     Starts at bottom dead centre and ends at top dead centre
    D.

     May start and end anywhere

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  6. In a four stroke cycle diesel engine, the inlet valve

    7. A.

     Opens at 20° before top dead center and closes at 40° after bottom dead center
    B.

     Opens at 20° after top dead center and closes at 20° before bottom dead center
    C.

     Opens at top dead center and closes at bottom dead center
    D.

     May open and close anywhere

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  7. In a four stroke cycle petrol engine, the inlet valve

    8. A.

     Opens at top dead center and closes at bottom dead center
    B.

     Opens at 20° before top dead center and closes at 40° after bottom dead center
    C.

     Opens at 20° after top dead center and closes at 20° before bottom dead center
    D.

     May open or close anywhere

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  8. In order to eliminate knocking in compression ignition engines, there should be

    9. A.

     Short delay period
    B.

     Late auto-ignition
    C.

     Low compression ratio
    D.

     High self ignition temperature of fuel

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  9. The normal heptane (C₇H₁₆) is given a rating of ________ octane number.

    10. A.

     0
    B.

     50
    C.

     100
    D.

     120

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  10. In order to mix air and petrol in the required proportion and to supply it to the engine during suction stroke, then _________ is employed.

    11. A.

     Fuel pump
    B.

     Injector
    C.

     Carburettor
    D.

     None of these

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