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Mechanical Engineering :: IC Engine and Nuclear Power Plants

  1. A fission chain reaction in uranium can be developed

  2. A.
    by increasing the contents of U235
    B.
    by slowing down fast neutrons so that U235 fission continues by slow neutron
    C.
    both (a) and (b)
    D.
    none of these

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  3. Thermal efficiency of a two stroke cycle engine is __________ a four stroke cycle engine.

  4. A.
    equal to
    B.
    less than
    C.
    greater than

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  5. A supercharged engine as compared to an ordinary engine

  6. A.
    is lighter
    B.
    requires smaller foundations
    C.
    consumes less lubricating oil
    D.
    all of these

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  7. Which one of the following engines will have heavier flywheel than the remaining ones?

  8. A.
    30 kW four-stroke petrol engine running at 1500 r.p.m.
    B.
    30 kW two-stroke petrol engine running at 1500 r.p.m.
    C.
    30 kW two-stroke diesel engine running at 750 r.p.m.
    D.
    30 kW four-stroke diesel engine running at 750 r.p.m.

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  9. Detonation is harmful due to

  10. A.
    increase in the rate of heat transfer, there is a reduction in the power output and efficiency of the engine
    B.
    excessive turbulence which removes most of the insulating gas boundary layer from the cylinder walls
    C.
    high intensity of knock causes crankshaft vibration and the engine runs rough
    D.
    none of the above

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  11. The brake power (B.P.) of the engine is given by (where W = Brake load or dead load in newtons, l = Length of arm in metres, N = Speed of engine in r.p.m., S - Spring balance reading in newtons, D = Dia. of brake drum in metres, and d = Dia. of rope in metres)

  12. A.
    B.
    C.
    D.
    all of these

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  13. A power plant giving least running cost of production of electrical power is

  14. A.
    steam power plant
    B.
    gas turbine power plant
    C.
    hydro electric power plant
    D.
    nuclear power plant

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  15. The thermal efficiency of petrol and gas engines is about

  16. A.
    15%
    B.
    30%
    C.
    50%
    D.
    70%

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  17. The firing order in an I.C. engine depends upon

  18. A.
    arrangement of the cylinders
    B.
    design of crankshaft
    C.
    number of cylinders
    D.
    all of these

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