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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

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  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

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

  6. A.

     Ammonia

    B.

     Carbon dioxide

    C.

     Sulphur dioxide

    D.

     R-12

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

  8. A.

     Absolute

    B.

     Relative

    C.

     Specific

    D.

     None of these

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  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.

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  11. The specific humidity during dehumidification process

  12. A.

     Remains constant

    B.

     Increases

    C.

     Decreases

    D.

     None of these

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  13. The specific humidity during humidification process

  14. A.

     Remains constant

    B.

     Increases

    C.

     Decreases

    D.

     None of these

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  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

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  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

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  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

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