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AMU Medical AMU Solved Paper-2010

  • question_answer
    Choose the incorrect statement from the following S1 : The efficiency of a heat engine can be 1, but the coefficient of performance of a refrigerator can never be infinity. S2: The first law of thermodynamics is basically the principle of conservation of energy. S3: The second law of thermodynamics does not allow several phenomena Consistent with the first law S4: A process, whose sole result is the transfer of heat from a colder object to a hotter object is impossible.

    A)  S1                                         

    B)  S3

    C)  S2                                         

    D)  S4

    Correct Answer: A

    Solution :

                     Efficiency, \[\eta =1-\frac{{{\theta }_{2}}}{{{\theta }_{1}}}\] \[\eta =1-\frac{{{\theta }_{2}}}{{{\theta }_{\infty }}}\]                    \[({{\theta }_{1}}=\infty )\]                 \[\eta =1\] As source at infinite temperature or sink at OK is not attainable. Therefore efficiency of heat engine is always less than 1.


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