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Home ‣ Mechanical Engineering ‣ Heat Transfer, Refrigeration and Air Conditioning Comments
  • Question

  • A mixture of dry air and water vapour, when the air has diffused the maximum amount of water vapour into it, is called


  • Options
  • A. dry air
  • B. moist air
  • C. saturated air
  • D. specific humidity

  • Correct Answer
  • saturated air 

    • Heat Transfer, Refrigeration and Air Conditioning problems

    Search Results

    • 1. The by-pass factor, in case of sensible cooling of air, is given by (where td1 = Dry bulb temperature of air entering the cooling coil, td2 = Dry bulb temperature of air leaving the cooling coil, and td3 = Dry bulb temperature of the cooling coil)

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 2. Emissivity of a body will be equal to its absorptivity at all temperatures.

    • Options
    • A. Yes
    • B. No
      • Discuss
    • 3. The expansion valve in a refrigerator controls the flow of refrigerant.

    • Options
    • A. Correct
    • B. Incorrect
      • Discuss
    • 4. The by-pass factor of a cooling coil decreases with

    • Options
    • A. decrease in fin spacing and increase in number of rows
    • B. increase in fin spacing and increase in number of rows
    • C. increase in fin spacing and decrease in number of rows
    • D. decrease in fin spacing and decrease in number of rows
      • Discuss
    • 5. The heat is transferred by conduction, convection and radiation in

    • Options
    • A. melting of ice
    • B. boiler furnaces
    • C. condensation of steam in condenser
    • D. none of these
      • Discuss
    • 6. The pressure at the outlet of a refrigerant compressor is called

    • Options
    • A. suction pressure
    • B. discharge pressure
    • C. critical pressure
    • D. back pressure
      • Discuss
    • 7. For unsaturated air, the dew point temperature is __________ wet bulb temperature.

    • Options
    • A. equal to
    • B. less than
    • C. more than
      • Discuss
    • 8. A thermostatic expansion valve in a refrigeration system

    • Options
    • A. ensures the evaporator completely filled with refrigerant of the load
    • B. is suitable only for constant load systems
    • C. maintains different temperatures in evaporator in proportion to load
    • D. none of the above
      • Discuss
    • 9. The inclined and non-uniformly spaced straight lines on a psychrometric chart indicates wet bulb temperature.

    • Options
    • A. Agree
    • B. Disagree
      • Discuss
    • 10. The C.O.P. of a heat pump working on a reversed Carnot cycle is

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss

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