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Mechanical Engineering :: Internal Combustion Engines

  1. The maximum temperature in the I.C. engine cylinder is of the order of

  2. A.

     500-1000°C

    B.

     1000-1500°C

    C.

     1500-2000°C

    D.

     2000-2500°C


  3. For maximum power generation, the air fuel ratio for a petrol engine for vehicles, is of the order of

  4. A.

     9 : 1

    B.

     12 : 1

    C.

     15 : 1

    D.

     18 : 1


  5. The theoretically correct air fuel ratio for petrol engine is of the order of

  6. A.

     6: 1

    B.

     9: 1

    C.

     12: 1

    D.

     15: 1


  7. In petrol engines, the delay period is of the order of

  8. A.

     0.001 second

    B.

     0.002 second

    C.

     0.003 second

    D.

     0.004 second


  9. The inlet value of a four stroke cycle I.C engine remains open for nearly

  10. A.

     180°

    B.

     125°

    C.

     235°

    D.

     200°


  11. As a result of detonation in an I.C. engine, following parameter attains very high value

  12. A.

     Peak pressure

    B.

     Rate of rise of pressure

    C.

     Rate of rise of temperature

    D.

     Peak temperature


  13. A higher compression ratio causes

  14. A.

     Pre-ignition

    B.

     Increase in detonation

    C.

     Acceleration in the rate of combustion

    D.

     Any one of these


  15. In a four stroke cycle petrol engine, the pressure inside the engine cylinder during the suction stroke is __________ the atmospheric pressure.

  16. A.

     Equal to

    B.

     Below

    C.

     Above

    D.

     None of these


  17. The injector nozzle of a compression ignition engine is required to inject fuel at a sufficiently high pressure in order to

  18. A.

     Inject fuel in a chamber of high pressure at the end of compression stroke

    B.

     Inject fuel at a high velocity to facilitate atomization

    C.

     Ensure that penetration is not high

    D.

     All of the above


  19. All heat engines utilize

  20. A.

     Low heat value of oil

    B.

     High heat value of oil

    C.

     Net calorific value of oil

    D.

     Calorific value of fuel