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

  • Relative humidity is given by (where pv = Partial pressure of water vapour, pb = Barometric pressure, ps = Pressure of saturated air, pd = Pressure at dry bulb temperature, pw = Saturation pressure corresponding to wet bulb temperature, and ? = Degree of saturation)


  • Options
  • A. Relative humidity is given by (where pv = Partial pressure of water vapour, pb = Barometric pressure
  • B. Relative humidity is given by (where pv = Partial pressure of water vapour, pb = Barometric pressure
  • C. Relative humidity is given by (where pv = Partial pressure of water vapour, pb = Barometric pressure
  • D. none of these

  • Correct Answer
  •  

    • Heat Transfer, Refrigeration and Air Conditioning problems

    Search Results

    • 1. The reduced ambient air cooling system has

    • Options
    • A. one cooling turbine and one heat exchanger
    • B. one cooling turbine and two heat exchangers
    • C. two cooling turbines and one heat exchanger
    • D. two cooling turbines and two heat exchangers
      • Discuss
    • 2. Planck's law holds good for all coloured bodies.

    • Options
    • A. True
    • B. False
      • Discuss
    • 3. The specific humidity during humidification process

    • Options
    • A. remains constant
    • B. increases
    • C. decreases
      • Discuss
    • 4. An ordinary passenger aircraft requires a cooling system of capacity.

    • Options
    • A. 2 TR
    • B. 4 TR
    • C. 8 TR
    • D. 10 TR
      • Discuss
    • 5. In a black body, all radiations are rejected.

    • Options
    • A. True
    • B. False
      • Discuss
    • 6. The thermal diffusivity for solids is generally less than those for liquids and gases.

    • Options
    • A. True
    • B. False
      • Discuss
    • 7. The by-pass factor (B. P. F.) in case of sensible heating of air is (Where td1 = Dry bulb temperature of air entering the heating coil, td2 = Dry bulb temperature of air leaving the heating coil, and td3 = Dry bulb temperature of heating coil)

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 8. A condenser of refrigeration system rejects heat at the rate of 120 kW, while its compressor consumes a power of 30 kW. The coefficient of performance of the system will be

    • Options
    • A. 1/4
    • B. 1/3
    • C. 3
    • D. 4
      • Discuss
    • 9. The capacity of a domestic refrigerator is in the range of

    • Options
    • A. 0.1 to 0.3 TR
    • B. 1 to 3 TR
    • C. 3 to 5 TR
    • D. 5 to 7 TR
      • Discuss
    • 10. Carbon dioxide is

    • Options
    • A. colourless
    • B. odourless
    • C. non-flammable
    • D. all of these
      • Discuss

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