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Mechanical Engineering :: IC Engine and Nuclear Power Plants

  1. Spark plugs in automobiles generally have a gap between

  2. A.
    0.3 to 0.7 mm
    B.
    0.2 to 0.8 mm
    C.
    0.4 to 0.9 mm
    D.
    0.6 to 1.8 mm

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  3. The injection of fuel by external source is not required in case of engines working on Otto cycle.

  4. A.
    Yes
    B.
    No

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  5. The running cost of a petrol engine is __________ than that of a diesel engine.

  6. A.
    higher
    B.
    lower

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  7. In a petrol engine, if diesel is used, then the engine will

  8. A.
    not run
    B.
    run more efficiently
    C.
    run at high speed
    D.
    explode

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  9. Number of working strokes per min. for a four stroke cycle engine are __________ the speed of the engine in r.p.m.

  10. A.
    equal to
    B.
    one-half
    C.
    twice
    D.
    four-times

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  11. The air standard efficiency of an I.C. engine depends on

  12. A.
    fuel used
    B.
    speed of engine
    C.
    compression ratio
    D.
    none of these

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  13. The mean effective pressure of a diesel engine having fixed compression ratio will __________ if cut off ratio decreases.

  14. A.
    increase
    B.
    decrease

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  15. The knocking tendency in spark ignition engines may be decreased by

  16. A.
    controlling the air-fuel mixture
    B.
    controlling the ignition timing
    C.
    controlling the exhaust temperature
    D.
    reducing the compression ratio

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  17. In a two stroke engine, the working cycle is completed in two revolutions of the crankshaft.

  18. A.
    Correct
    B.
    Incorrect

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  19. A reactor capable of converting a fertile material into fissile isotopes is called regenerative reactor.

  20. A.
    Yes
    B.
    No

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