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Mechanical Engineering :: Internal Combustion Engines

  1. The thermodynamic cycle on which the petrol engine works, is

  2. A.

     Otto cycle

    B.

     Joule cycle

    C.

     Rankine cycle

    D.

     Stirling cycle


  3. The thermal efficiency of petrol and gas engines is about

  4. A.

     15%

    B.

     30%

    C.

     50%

    D.

     70%


  5. The thermal efficiency of diesel engines is about

  6. A.

     15%

    B.

     30%

    C.

     50%

    D.

     70%


  7. The size of inlet valve of an engine in comparison to exhaust valve is

  8. A.

     More

    B.

     Less

    C.

     Same

    D.

     More/less depending on capacity of engine


  9. A spark plug gap is kept from

  10. A.

     0.3 to 0.7 mm

    B.

     0.2 to 0.8 mm

    C.

     0.4 to 0.9 mm

    D.

     0.6 to 1.0 mm


  11. When crude oil is heated, then which of the following hydrocarbon is given off first?

  12. A.

     Kerosene

    B.

     Gasoline

    C.

     Paraffin

    D.

     Natural gas


  13. Which one of the following event would reduce volumetric efficiency of a vertical compression ignition engine?

  14. A.

     Inlet valve closing after bottom dead center

    B.

     Inlet valve closing before bottom dead center

    C.

     Inlet valve opening before top dead center

    D.

     Exhaust valve closing after top dead center


  15. Which of the following does not relate to a compression ignition engine?

  16. A.

     Fuel pump

    B.

     Fuel injector

    C.

     Governor

    D.

     Carburettor


  17. Which of the following does not relate to a spark ignition engine?

  18. A.

     Ignition coil

    B.

     Spark plug

    C.

     Carburettor

    D.

     Fuel injector


  19. The output of a diesel engine can be increased without increasing the engine revolution or size in following way

  20. A.

     Feeding more fuel

    B.

     Heating incoming air

    C.

     Scavenging

    D.

     Supercharging