Railways Technical Ability Refrigeration and Air-Conditioning Question Bank Refrigeration and Air-Conditioning

  • question_answer A Carnot refrigerator works between the temperatures of 200 K and 300 K. If the refrigerator receives 1 k W of heat, the work requirement will be:

    A) 0.5 k W            

    B) 0.67 k W

    C) 1.5 k W            

    D) 3 k W

    Correct Answer: A

    Solution :

    \[{{T}_{1}}\,\,=\,\,300\,K,\] \[{{T}_{2}}\,\,=\,\,200\,K\] \[COP=\frac{{{T}_{2}}}{{{T}_{1}}-{{T}_{2}}}=\frac{200}{300-200}=\frac{200}{100}=2\] \[=\,\,\frac{Q}{W}\,\,=\,\,\frac{1}{W}\] W=0.5 kW


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