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Mechanical Engineering :: Internal Combustion Engines

  1. In the crankcase method of scavenging, the air pressure is produced by

  2. A.

     Supercharger

    B.

     Centrifugal pump

    C.

     Natural aspirator

    D.

     Movement of engine piston

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  3. The increase of efficiency of a compression ignition engine, as the load decreases, is due to

  4. A.

     Higher maximum temperature

    B.

     Qualitative governing

    C.

     Quantitative governing

    D.

     Hit and miss governing

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  5. In a four stroke cycle petrol engine, the charge is ignited at

  6. A.

     30° before top dead center

    B.

     30° after top dead center

    C.

     30° before bottom dead center

    D.

     30° after bottom dead center

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  7. The spark ignition engines are governed by

  8. A.

     Hit and miss governing

    B.

     Qualitative governing

    C.

     Quantitative governing

    D.

     Combination of (B) and (C)

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  9. The compression 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. It the temperature of intake air in IC engines is lowered, then its efficiency will

  12. A.

     Increase

    B.

     Decrease

    C.

     Remain same

    D.

     Increase up to certain limit and then decrease

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  13. If the intake air temperature of I.C. engine increases, its efficiency will

  14. A.

     Increase

    B.

     Decrease

    C.

     Remain same

    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

    D.

     None of these

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  17. The probability of knocking in diesel engines is increased by

  18. A.

     High self ignition temperature

    B.

     Low volatility

    C.

     Higher viscosity

    D.

     All of these

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  19. The pressure at the end of compression in the case of diesel engine is of the order of

  20. A.

     6 kg/cm

    B.

     12 kg/cm

    C.

     20 kg/cm

    D.

     35 kg/cm

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