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Mechanical Engineering :: Internal Combustion Engines

  1. A diesel engine is _________ as compared to petrol engine, both running at rated load.

  2. A.

     Equally efficient

    B.

     Less efficient

    C.

     More efficient

    D.

     None of these

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  3. Which of the following statement is correct regarding normal cetane?

  4. A.

     It is a standard fuel used for knock rating of diesel engines

    B.

     Its chemical name is normal hexadecane

    C.

     It has long carbon chain structure

    D.

     All of the above

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  5. The mechanical efficiency (ηm) of the engine is given by

  6. A.

     ηm = B.P/I.P

    B.

     ηm = I.P/B.P

    C.

     ηm = (B.P × I.P)/100

    D.

     None of these

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  7. The loud pulsating noise heard within the cylinder of an internal combustion engine is known as

  8. A.

     Detonation

    B.

     Turbulence

    C.

     Pre-ignition

    D.

     Supercharging

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  9. The power actually developed by the engine cylinder of an I.C. engine is known as

  10. A.

     Theoretical power

    B.

     Actual power

    C.

     Indicated power

    D.

     None of these

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  11. Most high speed compression engines operate on

  12. A.

     Diesel cycle

    B.

     Otto cycle

    C.

     Dual combustion cycle

    D.

     Special type of air cycle

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  13. High speed compression engines operate on

  14. A.

     Otto cycle

    B.

     Diesel cycle

    C.

     Dual combustion cycle

    D.

     All of these

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  15. The combustion in compression ignition engines is

  16. A.

     Homogeneous

    B.

     Heterogeneous

    C.

     Both (A) and (B)

    D.

     None of these

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  17. Combustion in compression ignition engines is

  18. A.

     Homogeneous

    B.

     Heterogeneous

    C.

     Both (A) and (B)

    D.

     Laminar

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  19. Antiknock for compression ignition engines is

  20. A.

     Napthene

    B.

     Tetra ethyl lead

    C.

     Amyl nitrate

    D.

     Hexadecane

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