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Mechanical Engineering :: Heat Transfer,Refrigeration and Air Conditioning

  1. The critical pressure of a liquid is the pressure

  2. A.
    above which a liquid will remain a liquid
    B.
    above which a liquid will explode
    C.
    above which a liquid will always convert into a vapour
    D.
    below which a liquid will always be in vapour form

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  3. Conduction is a process of heat transfer

  4. A.
    from one particle of the body to another without the actual motion of the particles
    B.
    from one particle of the body to another by the actual motion of the heated particles.
    C.
    from a hot body to a cold body, in a straight line, without affecting the intervening medium
    D.
    none of the above

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  5. Thermal diffusivity of a substance is

  6. A.
    directly proportional to the thermal conductivity
    B.
    inversely proportional to density of substance
    C.
    inversely proportional to specific heat
    D.
    all of the above

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  7. The sensible heat factor during the heating and humidification process is given by (where h1 = Enthalpy of air entering the heating coil, h2 = Enthalpy of air leaving the heating coil, and hA = Enthalpy of air at the end of humidification process)

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  9. Fouling factor is used

  10. A.
    in heat exchanger design as a safety factor
    B.
    in case of Newtonian fluids
    C.
    when a liquid exchanges heat with a gas
    D.
    none of the above

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  11. The natural convection air cooled condensers are used in

  12. A.
    domestic refrigerators
    B.
    water coolers
    C.
    room air conditioners
    D.
    all of these

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  13. The process, generally used in winter air-conditioning to warm and humidity the air, is called

  14. A.
    humidification.
    B.
    dehumidification
    C.
    heating and humidification
    D.
    cooling and dehumidification

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  15. At 100% relative humidity, wet bulb temperature, dry bulb temperature, dew point temperature and saturation temperature are equal.

  16. A.
    Correct
    B.
    Incorrect

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  17. Bell-Coleman cycle is a

  18. A.
    reversed Carnot cycle
    B.
    reversed Otto cycle
    C.
    reversed Joule cycle
    D.
    reversed Rankine cycle

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  19. Sulphur dioxide is extremely toxic and non-flammable.

  20. A.
    True
    B.
    False

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