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JEE Main & Advanced Physics Thermodynamical Processes Question Bank Heat Engine Refrigerator and Second Law of Thermodynamics

  • question_answer
    A scientist says that the efficiency of his heat engine which operates at source temperature 127°C and sink temperature 27°C is 26%, then                         [CBSE PMT 2001]

    A)            It is impossible                    

    B)            It is possible but less probable

    C)            It is quite probable

    D)            Data are incomplete   

    Correct Answer: A

    Solution :

                       \[{{\eta }_{\max }}=1-\frac{{{T}_{2}}}{{{T}_{1}}}=1-\frac{300}{400}=\frac{1}{4}=25%\]            So 26% efficiency is impossible


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