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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

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

  4. A.
    Yes
    B.
    No

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

  6. A.
    higher
    B.
    lower

  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

  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

  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

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

  14. A.
    increase
    B.
    decrease

  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

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

  18. A.
    Correct
    B.
    Incorrect

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

  20. A.
    Yes
    B.
    No