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Mechanical Engineering :: Heat Transfer,Refrigeration and Air Conditioning

Heat Transfer,Refrigeration and Air Conditioning - Section 1
Heat Transfer,Refrigeration and Air Conditioning - Section 2
Heat Transfer,Refrigeration and Air Conditioning - Section 3
Heat Transfer,Refrigeration and Air Conditioning - Section 4
Heat Transfer,Refrigeration and Air Conditioning - Section 5
Heat Transfer,Refrigeration and Air Conditioning - Section 6
Heat Transfer,Refrigeration and Air Conditioning - Section 7
Heat Transfer,Refrigeration and Air Conditioning - Section 8

  1. During a refrigeration cycle, heat is rejected by the refrigerant in a

    2. A.
    compressor
    B.
    condenser
    C.
    evaporator
    D.
    expansion valve

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  2. A refrigeration system

    3. A.
    removes heat from a low temperature body and delivers it to a high temperature body
    B.
    removes heat from a high temperature body and delivers it to a low temperature body
    C.
    rejects energy to a low temperature body
    D.
    none of the above

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  3. The subcooling in a refrigeration cycle

    4. A.
    does not alter C.O.P.
    B.
    increases C.O.P.
    C.
    decreases C.O.P.
    D.
    none of these

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  4. Nusselt number (NN) is given by

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  5. During sensible cooling of air __________ decreases.

    6. A.
    wet bulb temperature
    B.
    relative humidity
    C.
    dry bulb temperature
    D.
    specific humidity

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  6. The critical radius is the insulation radius at which the resistance to heat flow is

    7. A.
    maximum
    B.
    minimum
    C.
    zero
    D.
    none of these

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  7. In case of solids, the heat transfer takes place according to radiation.

    8. A.
    Correct
    B.
    Incorrect

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  8. A water cooled condenser operates at a __________ condensing temperature than an air-cooled condenser.

    9. A.
    higher
    B.
    lower

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  9. The relative humidity decreases as air gets wet.

    10. A.
    True
    B.
    False

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  10. The temperature of ammonia after compression in a vapour compression system is

    11. A.
    20 to 50° C
    B.
    50 to 70° C
    C.
    70 to 110° C
    D.
    none of these

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