Refrigeration and Air-conditioning Miscellaneous


Refrigeration and Air-conditioning Miscellaneous

Refrigeration and Air-conditioning

  1. For air with a relative humidity of 80%









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    Correct Option: B


  1. For air at a given temperature, as the relative humidity is increased isothermally,









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    DBT = DBT2
    DBT →
    φ ↑, Twb ↓
    Relative humidity is increased isothermally.

    Correct Option: A


    DBT = DBT2
    DBT →
    φ ↑, Twb ↓
    Relative humidity is increased isothermally.



  1. If moist air is cooled by sensible heat removal, which of the following is true?









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    Sensible cooling process

    Correct Option: D

    Sensible cooling process


  1. Atmospheric air from 40°C and 60 percent relative humidity can be brought to 20°C and 60 percent relative humidity by









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    Cooling and dehumidification process,

    Correct Option: A

    Cooling and dehumidification process,



  1. A reversed Carnot cycle refrigerator maintains a temperature of –5°C. The ambient air temperature is 35°C. The heat gained by the refrigerator at a continuous rate is 2.5 kJ/s. The power (in watt) required to pump this heat out continuously is _______









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    Q1
    =
    Q2
    268308

    Q2 =
    2.5 × 308
    [Q1 = 2.5]
    268

    Q2 = 2.873 kW
    w = Q2 – Q1 = 0.373 kw = 373.13 Watt.

    Correct Option: A

    Q1
    =
    Q2
    268308

    Q2 =
    2.5 × 308
    [Q1 = 2.5]
    268

    Q2 = 2.873 kW
    w = Q2 – Q1 = 0.373 kw = 373.13 Watt.