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Railways NTPC (Technical Ability) Vibration Analysis Question Bank Vibration Analysis

  • question_answer
    The coefficient of performance of a refrigerator working on a reversed Carnot cycle is 4 the ratio of the highest absolute temperature to the lowest absolute temperature is:

    A) 1.2                               

    B) 1.25

    C) 3.33                             

    D) 4

    Correct Answer: B

    Solution :

    \[COP=\frac{{{T}_{2}}}{{{T}_{1}}-{{T}_{2}}}\] \[=\frac{1}{\frac{{{T}_{1}}}{{{T}_{2}}}-1}=4\] \[4\frac{{{T}_{1}}}{{{T}_{2}}}-4=1\] \[\frac{{{T}_{1}}}{{{T}_{2}}}=\frac{5}{4}=1.25\]


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