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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


  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


  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


  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


  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


  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


  13. High speed compression engines operate on

  14. A.

     Otto cycle

    B.

     Diesel cycle

    C.

     Dual combustion cycle

    D.

     All of these


  15. The combustion in compression ignition engines is

  16. A.

     Homogeneous

    B.

     Heterogeneous

    C.

     Both (A) and (B)

    D.

     None of these


  17. Combustion in compression ignition engines is

  18. A.

     Homogeneous

    B.

     Heterogeneous

    C.

     Both (A) and (B)

    D.

     Laminar


  19. Antiknock for compression ignition engines is

  20. A.

     Napthene

    B.

     Tetra ethyl lead

    C.

     Amyl nitrate

    D.

     Hexadecane