Home / Mechanical Engineering / Internal Combustion Engines :: section-1

Mechanical Engineering :: Internal Combustion Engines

  1. The advancing of spark timing in spark ignition engines will _________ knocking tendency.

  2. A.

     Increase

    B.

     Reduce

    C.

     Not effect

    D.

     None of these

    View Answer

    Workspace

    Discuss Discuss in Forum


  3. The higher combustion chamber wall temperature in compression ignition engines will _________ knocking tendency.

  4. A.

     Increase

    B.

     Reduce

    C.

     Not effect

    D.

     None of these

    View Answer

    Workspace

    Discuss Discuss in Forum


  5. In petrol engines, advancing of the spark timing will _________ the knocking tendency.

  6. A.

     Not effect

    B.

     Decrease

    C.

     Increase

    D.

     None of these

    View Answer

    Workspace

    Discuss Discuss in Forum


  7. In petrol engine, using a fixed octane rating fuel and fixed compression ratio, supercharging will _________ the knocking tendency.

  8. A.

     Not effected

    B.

     Decrease

    C.

     Increase

    D.

     None of these

    View Answer

    Workspace

    Discuss Discuss in Forum


  9. The increase of cooling water temperature in petrol engine will _________ the knocking tendency.

  10. A.

     Not effect

    B.

     Decrease

    C.

     Increase

    D.

     None of these

    View Answer

    Workspace

    Discuss Discuss in Forum


  11. Flash point of fuel oil is

  12. A.

     Minimum temperature to which oil is heated in order to give off inflammable vapours in sufficient quantity to ignite momentarily when brought in contact with a flame

    B.

     Temperature at which it solidifies or congeals

    C.

     Temperature at which it catches fire without external aid

    D.

     Indicated by 90% distillation temperature, i.e. when 90% of sample oil has distilled off

    View Answer

    Workspace

    Discuss Discuss in Forum


  13. The working pressure and temperature inside the cylinder of an internal combustion engine is _________ as compared to a steam engine.

  14. A.

     Low

    B.

     Very low

    C.

     High

    D.

     Very high

    View Answer

    Workspace

    Discuss Discuss in Forum


  15. If V₁ is the jet velocity and V₀ is the vehicle velocity, then the propulsive efficiency of a rocket is given by

  16. A.

     [2(V₀/V₁)]/ [1 + (V₀/V₁)²]

    B.

     (V₀/V₁)/ [1 + (V₀/V₁)²]

    C.

     V₀/(V₀ + V₁)

    D.

     V₁/(V₀ + V₁)

    View Answer

    Workspace

    Discuss Discuss in Forum


  17. Thermal efficiency of a two stroke cycle engine is _________ a four stroke cycle engine.

  18. A.

     Equal to

    B.

     Less than

    C.

     Greater than

    D.

     None of these

    View Answer

    Workspace

    Discuss Discuss in Forum


  19. Theoretically, a four stroke cycle engine should develop _________ power as that of a two stroke cycle engine.

  20. A.

     Half

    B.

     Same

    C.

     Double

    D.

     Four times

    View Answer

    Workspace

    Discuss Discuss in Forum