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Mechanical Engineering :: Steam Boilers and Engines

  1. The cylinder condensation or missing quantity may be reduced by

  2. A.

    the efficient steam jacketing of the cylinder walls

    B.

    superheating the steam supplied to the engine cylinder

    C.

    keeping the expansion ratio small in each cylinder

    D.

    all of the above


  3. The actual vacuum in a condenser is equal to

  4. A.

    barometric pressure + actual pressure

    B.

    barometric pressure - actual pressure

    C.

    gauge pressure + atmospheric pressure

    D.

    gauge pressure - atmospheric pressure


  5. The function of a superheater is to heat the feed water by utilising the heat in the exhaust flue gases before leaving through the chimney.

  6. A.

    Yes

    B.

    No


  7. Willian's line follows the law (where b = A constant representing the shape of the Willian's line, a = Another constant i.e. no load consumption per hour, I.P. = Indicated power, and m = Steam consumption per hour)

  8. A.

    I.P. = a x m + b

    B.

    m = a + b x I.P.

    C.

    I.P. = b x m + a

    D.

    m = b/I.P. - a


  9. When the total heat of steam is h kJ/kg and the sensible heat of feed water is hf1 kJ/kg, then the factor of evaporation is given by

  10. A.

    \(\frac { h - h_{f1} } { 2257 } \)

    B.

    \(\frac { h + h_{f1} } { 2257 } \)

    C.

    \(\frac { h \times h_{f1} } { 2257 } \)

    D.

    none of these