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Railways NTPC (Technical Ability) Refrigeration and Air-Conditioning Question Bank Refrigeration and Air-Conditioning

  • question_answer
    A heat pump working on a reversed carnot cycle has a COP of 5. If it works as a refrigerator taking 1 kW work input, the refrigerating effect will be:

    A) 1 kW                

    B) 2 kW

    C) 3 kW                

    D) 4 kW

    Correct Answer: D

    Solution :

    COP of heat pump \[=\frac{{{Q}_{s}}}{W}=5\] \[{{Q}_{r}}=5W\] \[{{Q}_{s}}=R+W\] \[5W-W=R\] \[R=4W=4\times 1=4\,k\,W\]


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