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Mechanical Engineering :: Internal Combustion Engines

  1. Does the supply of scavenging air at a density greater than that of atmosphere mean engine is supercharged?

  2. A.

     Yes

    B.

     No

    C.

     To some extent

    D.

     Unpredictable

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  3. The _________ engines can work on very lean mixture of fuel.

  4. A.

     Spark ignition

    B.

     Compression ignition

    C.

     Both (A) and (B)

    D.

     None of these

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  5. Iso-octane (C₈H₁₈) has octane number of

  6. A.

     0

    B.

     50

    C.

     100

    D.

     120

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  7. In a four stroke cycle engine, the sequence of operations is

  8. A.

     Suction, compression, expansion and exhaust

    B.

     Suction, expansion, compression and exhaust

    C.

     Expansion, compression, suction and exhaust

    D.

     Compression, expansion, suction and exhaust

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  9. In loop scavenging, the top of the piston is

  10. A.

     Flat

    B.

     Contoured

    C.

     Slanted

    D.

     Depressed

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  11. The actual volume of fresh charge admitted in 4-stroke petrol engine is

  12. A.

     Equal to stroke volume

    B.

     Equal to stroke volume and clearance volume

    C.

     Less than stroke volume

    D.

     More than stroke volume

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  13. The ratio of the volume of charge admitted at N.T.P. to the swept volume of the piston is called

  14. A.

     Mechanical efficiency

    B.

     Overall efficiency

    C.

     Volumetric efficiency

    D.

     Relative efficiency

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  15. In order to prevent knocking in spark ignition engines, the charge away from the spark plug should have

  16. A.

     Low density

    B.

     Low temperature

    C.

     Long ignition delay

    D.

     All of these

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  17. The inlet valve of a four stroke cycle internal combustion engine remains open for

  18. A.

     130°

    B.

     180°

    C.

     230°

    D.

     270°

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  19. The turbine of the turboprop engine is __________ that of the turbojet engine.

  20. A.

     Same as

    B.

     Smaller than

    C.

     Bigger than

    D.

     None of these

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