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Mechanical Engineering :: Heat Transfer,Refrigeration and Air Conditioning

  1. The expression is used for calculating

  2. A.
    relative humidity
    B.
    humidity ratio
    C.
    degree of saturation
    D.
    pressure of water vapour

  3. The critical thickness of insulation for a sphere is

  4. A.
    k/h0
    B.
    2k/h0
    C.
    h0/k
    D.
    h0/2k

  5. The difference between dry bulb temperature and dew point temperature, is called

  6. A.
    dry bulb depression
    B.
    wet bulb depression
    C.
    dew point depression
    D.
    degree of saturation

  7. Logarithmic mean temperature difference is the same as the arithmetic mean temperature difference.

  8. A.
    Agree
    B.
    Disagree

  9. Film coefficient is defined as the ratio of

  10. A.
    thermal conductivity to the equivalent thickness of the film of fluid
    B.
    temperature drop through the films of fluids to the thickness of film of fluids
    C.
    thickness of film of fluid to the thermal conductivity
    D.
    thickness of film of fluid to the temperature drop through the films of fluids

  11. Planck's law holds good for all coloured bodies.

  12. A.
    True
    B.
    False

  13. In mechanical refrigeration system, the refrigerant has the maximum temperature

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

  15. The capacity of a domestic refrigerator is in the range of

  16. A.
    0.1 to 0.3 TR
    B.
    1 to 3 TR
    C.
    3 to 5 TR
    D.
    5 to 7 TR

  17. The condition of refrigerant after passing through the condenser in a vapour compression system is

  18. A.
    saturated liquid
    B.
    wet vapour
    C.
    dry saturated vapour
    D.
    superheated vapour

  19. The leakage in a refrigeration system using freon is detected by

  20. A.
    halide torch
    B.
    sulphur sticks
    C.
    soap and water
    D.
    all of these