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Mechanical Engineering :: Refrigeration and Air Conditioning

  1. The leakage in a refrigeration system using ammonia is detected by

  2. A.

     Halide torch

    B.

     Sulphur sticks

    C.

     Soap and water

    D.

     All of these


  3. The lower horizontal line of the refrigeration cycle plotted on pressure-enthalpy diagram represents

  4. A.

     Condensation of the refrigerant vapour

    B.

     Evaporation of the refrigerant liquid

    C.

     Compression of the refrigerant vapour

    D.

     Metering of the refrigerant liquid


  5. Which of the following refrigerant is highly toxic and flammable?

  6. A.

     Ammonia

    B.

     Carbon dioxide

    C.

     Sulphur dioxide

    D.

     R-12


  7. The wet bulb depression indicates _________ humidity of the air.

  8. A.

     Absolute

    B.

     Relative

    C.

     Specific

    D.

     None of these


  9. In case of sensible cooling of air, the coil efficiency is given by

  10. A.

     B.P.F. - 1

    B.

     1 - B.P.F.

    C.

     1/ B.P.F.

    D.

     1 + B.P.F.


  11. The specific humidity during dehumidification process

  12. A.

     Remains constant

    B.

     Increases

    C.

     Decreases

    D.

     None of these


  13. The specific humidity during humidification process

  14. A.

     Remains constant

    B.

     Increases

    C.

     Decreases

    D.

     None of these


  15. The ratio of heat extracted in the refrigerator to the work-done on the refrigerant is called

  16. A.

     Coefficient of performance of refrigeration

    B.

     Coefficient of performance of heat pump

    C.

     Relative coefficient of performance

    D.

     Refrigerating efficiency


  17. The material of pipe lines for a system using Freon as a refrigerant should be

  18. A.

     Brass

    B.

     Copper

    C.

     Steel

    D.

     Aluminium


  19. The vapour pressure of refrigerant should be

  20. A.

     Lower than atmospheric pressure

    B.

     Higher than atmospheric pressure

    C.

     Equal to atmospheric pressure

    D.

     Could be anything