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

  • Degree of saturation or percentage humidity is


  • Options
  • A. the mass of water vapour present in 1 m3 of dry air
  • B. the mass of water vapour present in 1 kg of dry air
  • C. the ratio of the actual mass of water vapour in a unit mass of dry air to the mass of water vapour in the same mass of dry air when it is saturated at the same temperature and pressure.
  • D. the ratio of actual mass of water vapour in a given volume of moist air to the mass of water vapour in the same volume of saturated air at the same temperature and pressure

  • Correct Answer
  • the ratio of the actual mass of water vapour in a unit mass of dry air to the mass of water vapour in the same mass of dry air when it is saturated at the same temperature and pressure. 

    • Heat Transfer, Refrigeration and Air Conditioning problems

    Search Results

    • 1. The coefficient of performance of Heat Pump is always __________ one.

    • Options
    • A. equal to
    • B. less than
    • C. greater than
      • Discuss
    • 2. The temperature of ammonia after compression in a vapour compression system is

    • Options
    • A. 20 to 50° C
    • B. 50 to 70° C
    • C. 70 to 110° C
    • D. none of these
      • Discuss
    • 3. The amount of radiation mainly depends upon the

    • Options
    • A. nature of the body
    • B. temperature of the body
    • C. type of surface of the body
    • D. all of these
      • Discuss
    • 4. The heat transfer takes place according to

    • Options
    • A. Zeroth law of thermodynamics
    • B. First law of thermodynamics
    • C. Second law of thermodynamics
    • D. Kirchhoff's law
      • Discuss
    • 5. The condition of refrigerant after leaving the compressor and before entering the condenser is superheated vapour.

    • Options
    • A. Yes
    • B. No
      • Discuss
    • 6. The subcooling in a refrigeration cycle

    • Options
    • A. does not alter C.O.P.
    • B. increases C.O.P.
    • C. decreases C.O.P.
    • D. none of these
      • Discuss
    • 7. Fourier's law of heat conduction is (where Q = Amount of heat flow through the body in unit time, A = Surface area of heat flow, taken at right angles to the direction of heat flow, dT = Temperature difference on the two faces of the body, dx = Thickness of the body, through which the heat flows, taken along the direction of heat flow, and k = Thermal conductivity of the body)

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 8. The process of heat transfer from a hot body to a cold body, in a straight line, without affecting the intervening medium, is called radiation.

    • Options
    • A. True
    • B. False
      • Discuss
    • 9. The by-pass factor for a cooling coil

    • Options
    • A. increases with increase in velocity of air passing through it
    • B. decreases with increase in velocity of air passing through it
    • C. remains unchanged with increase in velocity of air passing through it
    • D. may increase or decrease with increase in velocity of air passing through it depending upon the condition of air entering
      • Discuss
    • 10. The formation of frost on cooling coils in a refrigerator

    • Options
    • A. increases heat transfer
    • B. improves C.O.P. of the system
    • C. increases power consumption
    • D. reduces power consumption
      • Discuss

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