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  1. Moist air is cooled along the line of constant __________ , when it is passed over a cold & dry cooling coil, such that no condensation occurs?

  2. A.
    enthalpy
    B.
    relative humidity
    C.
    wet bulb temperature
    D.
    dew point temperature

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  3. Which of the following metals can not be hot worked at room temperature ?

  4. A.
    Zinc
    B.
    Nickel
    C.
    Lead
    D.
    Tin

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  5. Primary designation of steel is based on its

  6. A.
    hardness & tensile strength.
    B.
    carbon content.
    C.
    iron content.
    D.
    alloying elements content.

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  7. Steel containing low percentage of nickel, chromium & tungsten are termed as the __________ steel.

  8. A.
    wrought
    B.
    tool
    C.
    alloy
    D.
    plain carbon

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  9. Superheating of steam is done at constant

  10. A.
    enthalpy
    B.
    entropy
    C.
    pressure
    D.
    volume

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  11. The surface tension of a liquid, at critical temperature is

  12. A.
    indeterminate.
    B.
    zero.
    C.
    infinity.
    D.
    same as that at any other temperature.

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  13. Large scale fire on fuel gas line is normally extinguished by

  14. A.
    water
    B.
    steam
    C.
    foam
    D.
    nitrogen

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  15. Brazing is the joining of metals

  16. A.
    without melting the base metal.
    B.
    with a non-ferrous filler.
    C.
    both (a) & (b).
    D.
    neither (a) nor (b).

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  17. Moist climate is the most favourable factor in the site selection far a

  18. A.
    steel plant
    B.
    textile factory
    C.
    petroleum refinery
    D.
    coke oven battery

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  19. Dry saturated steam can be converted into superheated steam by

  20. A.
    increasing its cross-sectional area of flow.
    B.
    passing it through a pressure reducing valve.
    C.
    forcing it downwards through a vertical tube.
    D.
    none of these

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