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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. The superheated vapour region, in a pressure enthalpy chart, is represented by the space

    2. A.
    to the left of saturated liquid line
    B.
    to the right of saturated liquid line
    C.
    between the saturated liquid line and saturated vapour line
    D.
    none of the above

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  2. The minimum temperature to which water can be cooled in a cooling tower is

    3. A.
    dew point temperature of air
    B.
    wet bulb temperature of air
    C.
    dry bulb temperature of air
    D.
    ambient air temperature

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  3. The index which corelates the combined effects of air temperature, relative humidity and air velocity on the human body, is known as

    4. A.
    mean radiant temperature
    B.
    effective temperature
    C.
    dew point temperature
    D.
    none of these

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  4. The ratio of Nusselt number and the product of Reynold's number and Prandtl number is equal to

    5. A.
    Stanton number
    B.
    Biot number
    C.
    Peclet number
    D.
    Grashoff number

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  5. The alignment circle is marked on the psychrometric chart at

    6. A.
    20°C DBT and 50% RH
    B.
    26°C DBT and 50% RH
    C.
    20°C DBT and 60% RH
    D.
    26°C DBT and 60% RH

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  6. The C.O.P. of a Carnot refrigerator in winter will be __________ as compared to C.O.P. in summer.

    7. A.
    same
    B.
    lower
    C.
    higher

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  7. Which of the following statement is correct?

    8. A.
    The human body can lose heat even if its temperature is less than the atmospheric temperature.
    B.
    The increase in air movement increases the evaporation from the human body.
    C.
    The warm air increases the rate of radiation of heat from the human body.
    D.
    both (a) and (b)

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  8. When the temperature of the surrounding is higher than the temperature of the body, then the heat loss by convection from the body to the surrounding will be

    9. A.
    positive
    B.
    negative
    C.
    zero
    D.
    none of these

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  9. If a gas is to be liquified, its temperature must be

    10. A.
    increased to a value above its critical temperature
    B.
    reduced to a value below its critical temperature
    C.
    equal to critical temperature
    D.
    none of the above

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  10. The thermostatic expansion valve is used in __________ type of evaporators.

    11. A.
    flooded
    B.
    DX coil
    C.
    dry

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