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Mechanical Engineering :: Refrigeration and Air Conditioning

Refrigeration and Air Conditioning - section-1
  1. In vapour compression cycle, the condition of refrigerant is high pressure saturated liquid

    2. A.

     After passing through the condenser
    B.

     Before passing through the condenser
    C.

     After passing through the expansion or throttle valve
    D.

     Before entering the expansion valve

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  2. In a vapour compression system, the condition of refrigerant is dry saturated vapour

    3. A.

     Before entering the compressor
    B.

     After leaving the compressor
    C.

     Before entering the condenser
    D.

     After leaving the condenser

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  3. In vapour compression cycle the condition off refrigerant is dry saturated vapour

    4. A.

     After passing through the condenser
    B.

     Before passing through the condenser
    C.

     After passing through the expansion or throttle valve
    D.

     Before entering the compressor

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  4. The refrigerant used in small tonnage commercial machines (hermetically sealed units) is

    5. A.

     Ammonia
    B.

     Carbon dioxide
    C.

     Sulphur dioxide
    D.

     R-12

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  5. The refrigeration effect in a dry evaporator compared to flooded evaporator in a similar plant is

    6. A.

     Same
    B.

     More
    C.

     Less
    D.

     More or less depending on ambient conditions

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  6. Highest pressure encountered in a refrigeration system should be

    7. A.

     Critical pressure of refrigerant
    B.

     Much below critical pressure
    C.

     Much above critical pressure
    D.

     Near critical pressure

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  7. In a vapour compression system, the condition of refrigerant before passing through the condenser is

    8. A.

     Saturated liquid
    B.

     Wet vapour
    C.

     Dry saturated vapour
    D.

     Superheated vapour

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  8. Which of the following cycles uses air as the refrigerant?

    9. A.

     Ericson
    B.

     Stirling
    C.

     Carnot
    D.

     Bell Coleman

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  9. The heat rejection factor (HRF) is given by

    10. A.

     1 + C.O.P
    B.

     1 - C.O.P.
    C.

     1 + (1/C.O.P)
    D.

     1 - (1/C.O.P)

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  10. In a spray washing system, if the temperature of water is higher than the dry bulb temperature of entering air, then the air is

    11. A.

     Heated and dehumidified
    B.

     Heated and humidified
    C.

     Cooled and humidified
    D.

     Cooled and dehumidified

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