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Mechanical Engineering :: Refrigeration and Air Conditioning

  1. The index which correlates the combined effects of air temperature, relative humidity and air velocity on the human body, is known as

  2. A.

     Mean radiant temperature

    B.

     Effective temperature

    C.

     Dew point temperature

    D.

     None of these


  3. The mass of water vapour present in __________ is called absolute humidity.

  4. A.

     1 m3 of water

    B.

     1 m3 of dry air

    C.

     1 kg of wet air

    D.

     1 kg of dry air


  5. An Electrolux refrigerator is called a _________ absorption system.

  6. A.

     Single fluid

    B.

     Two fluids

    C.

     Three fluids

    D.

     None of these


  7. For unsaturated air, the dew point temperature is __________ wet bulb temperature.

  8. A.

     Equal to

    B.

     Less than

    C.

     More than

    D.

     None of these


  9. As relative humidity decreases, the dew point temperature will be ________ wet bulb temperature.

  10. A.

     Same as

    B.

     Lower than

    C.

     Higher than

    D.

     None of these


  11. The wet bulb temperature at 100% relative humidity is ________ dry bulb temperature.

  12. A.

     Same as

    B.

     Lower than

    C.

     Higher than

    D.

     None of these


  13. In a reversed Brayton cycle, the heat is absorbed by the air during

  14. A.

     Isentropic compression process

    B.

     Constant pressure cooling process

    C.

     Isentropic expansion process

    D.

     Constant pressure expansion process


  15. The curved lines on a psychrometric chart indicates

  16. A.

     Dry bulb temperature

    B.

     Wet bulb temperature

    C.

     Dew point temperature

    D.

     Relative humidity


  17. The horizontal and non-uniformly spaced lines on a psychrometric chart indicates

  18. A.

     Dry bulb temperature

    B.

     Wet bulb temperature

    C.

     Dew point temperature

    D.

     Specific humidity


  19. The vertical and uniformly spaced lines on a psychrometric chart indicates

  20. A.

     Dry bulb temperature

    B.

     Wet bulb temperature

    C.

     Dew point temperature

    D.

     Specific humidity