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Mechanical Engineering :: Internal Combustion Engines

  1. In a petrol engine, the mixture has the lowest pressure at the

  2. A.

     Beginning of suction stroke

    B.

     End of suction stroke

    C.

     End of compression stroke

    D.

     None of these


  3. In case of gas turbines, the gaseous fuel consumption guarantees are based on

  4. A.

     High heat value

    B.

     Low heat value

    C.

     Net calorific value

    D.

     Calorific value


  5. Gaseous fuel guarantees are based on

  6. A.

     Calorific value of oil

    B.

     Low heat value of oil

    C.

     High heat value of oil

    D.

     Mean heat value of oil


  7. The rating of a diesel engine, with increase in air inlet temperature, will

  8. A.

     Increase linearly

    B.

     Decrease linearly

    C.

     Increase parabolically

    D.

     Decrease parabolically


  9. If one cylinder of a diesel engine receives more fuel than the others, then for that cylinder the

  10. A.

     Exhaust will be smoky

    B.

     Piston rings would stick into piston grooves

    C.

     Engine starts overheating

    D.

     Scavenging occurs


  11. By higher octane number of spark ignition fuel, it is meant that the fuel has

  12. A.

     Higher heating value

    B.

     Higher flash point

    C.

     Lower volatility

    D.

     Longer ignition delay


  13. In a four stroke cycle diesel engine, the exhaust valve

  14. A.

     Opens at 30° before bottom dead centre and closes at 10° after top dead centre

    B.

     Opens at 30° after bottom dead centre and closes at 10° before top dead centre

    C.

     Opens at bottom dead centre and closes at top dead centre

    D.

     May open and close anywhere


  15. A petrol engine, during suction stroke draws

  16. A.

     Air only

    B.

     Petrol only

    C.

     A mixture of petrol and air

    D.

     None of these


  17. In a diesel engine, the duration between the time of injection and ignition, is known as

  18. A.

     Pre-ignition period

    B.

     Delay period

    C.

     Period of ignition

    D.

     Burning period


  19. The thermal efficiency of a petrol engine is _________ as compared to diesel engine.

  20. A.

     Same

    B.

     Less

    C.

     More

    D.

     None of these