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Mechanical Engineering :: Heat Transfer,Refrigeration and Air Conditioning

  1. During cooling and dehumidification, dry bulb temperature

  2. A.
    remains constant
    B.
    increases
    C.
    decreases

  3. The coefficient of performance of electrolux refrigerator is the ratio of

  4. A.
    heat supplied by the gas burner to the heat absorbed by the evaporator
    B.
    heat absorbed by the evaporator to the heat supplied by the gas burner
    C.
    heat supplied by the gas burner minus the heat absorbed by the evaporator to the heat supplied by the gas burner
    D.
    heat absorbed by the evaporator minus the heat supplied by the gas burner to the heat absorbed by the evaporator

  5. The sulphur sticks, in case of leakage of ammonia refrigerant, gives white smoke.

  6. A.
    True
    B.
    False

  7. During gas charging in an ammonia vapour compression system, the connection is made at the compressor outlet.

  8. A.
    Agree
    B.
    Disagree

  9. The conditioned air supplied to the room must have the capacity to take up

  10. A.
    room sensible heat load only
    B.
    room latent heat load only
    C.
    both room sensible heat and latent heat loads
    D.
    none of the above

  11. The process of removing moisture from the air, without change in its dry bulb temperature, is called dehumidification.

  12. A.
    Correct
    B.
    Incorrect

  13. The specific humidity during dehumidification process

  14. A.
    remains constant
    B.
    increases
    C.
    decreases

  15. Which of the following refrigerant has the lowest freezing point?

  16. A.
    R-11
    B.
    R-12
    C.
    R-22
    D.
    Ammonia

  17. For a white body, absorptivity (α ) = 0, reflectivity (ρ) = 1 and transmittivity (τ) = 0.

  18. A.
    Correct
    B.
    Incorrect