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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. Sensible heat factor is given by (where S.H. = Sensible heat, and L.H. = Latent heat)

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  2. Stefan-Boltzmann law is applicable for heat transfer by convection.

    3. A.
    Agree
    B.
    Disagree

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  3. The most commonly used method for the design of duct size is the

    4. A.
    velocity reduction method
    B.
    equal friction method
    C.
    static regain method
    D.
    dual or double method

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  4. In counter-current flow heat exchangers

    5. A.
    both the fluids at inlet are in their hottest state
    B.
    both the fluids at inlet are in their coldest state
    C.
    both the fluids at exit are in their hottest state
    D.
    one fluid is coldest and the other is hottest at inlet

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  5. The rate of heat flow through a body is . The term x/kA is known as

    6. A.
    thermal coefficient
    B.
    thermal resistance
    C.
    thermal conductivity
    D.
    none of these

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  6. In a vapour compression system, the condition of refrigerant is dry saturated vapour

    7. A.
    before entering the compressor
    B.
    after leaving the compressor
    C.
    before entering the condenser
    D.
    after leaving the condenser

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  7. An evaporator is also known as

    8. A.
    freezing coil
    B.
    cooling coil
    C.
    chilling coil
    D.
    all of these

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  8. The rate of heat flow through a body is . The term is known as temperature gradient.

    9. A.
    Yes
    B.
    No

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  9. Oil separator in a refrigeration cycle is installed

    10. A.
    before compressor
    B.
    between compressor and condenser
    C.
    between condenser and evaporator
    D.
    between condenser and expansion valve

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  10. In larger industrial and commercial reciprocating compression systems, refrigerent widely used is

    11. A.
    ammonia
    B.
    carbon dioxide
    C.
    sulphur dioxide
    D.
    R-12

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