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

  • 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

  • Correct Answer
  • 4 

    • Heat Transfer, Refrigeration and Air Conditioning problems

    Search Results

    • 1. 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
    • 2. The thermal diffusivity for solids is generally less than those for liquids and gases.

    • Options
    • A. True
    • B. False
      • Discuss
    • 3. 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.
    • B.
    • C.
    • D. none of these
      • Discuss
    • 4. 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
    • 5. Planck's law holds good for all coloured bodies.

    • Options
    • A. True
    • B. False
      • Discuss
    • 6. 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
    • 7. Carbon dioxide is

    • Options
    • A. colourless
    • B. odourless
    • C. non-flammable
    • D. all of these
      • Discuss
    • 8. The difference between dry bulb temperature and dew point temperature, is called

    • Options
    • A. dry bulb depression
    • B. wet bulb depression
    • C. dew point depression
    • D. degree of saturation
      • Discuss
    • 9. Conduction is the process of heat transfer from one particle of the body to another by the actual motion of the heated particles.

    • Options
    • A. True
    • B. False
      • Discuss
    • 10. If the condenser temperature is kept constant, the coefficient of performance of a refrigeration cycle increases with the increase in evaporator temperature.

    • Options
    • A. Yes
    • B. No
      • Discuss

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