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NEET Physics Thermodynamical Processes NEET PYQ-Thermodynamical Processes

  • question_answer
    The temperatures of source and sink of a heat engine are \[{{127}^{o}}C\] and \[{{27}^{o}}C\] respectively. An inventor claims its efficiency to be 26% then:                                                                      [AIPMT 2001]

    A)  it is impossible

    B)                   it is possible with high probability

    C)       it is possible with low probability

    D)       data are insufficient

    Correct Answer: A

    Solution :

    Efficiency of heat engine is,
                            \[\eta =1-\frac{{{T}_{2}}}{{{T}_{1}}}\] or \[\eta =\frac{{{T}_{1}}-{{T}_{2}}}{{{T}_{1}}}\]
    Here,     \[{{T}_{1}}=273+127=400\text{ }K\]
                            \[{{T}_{2}}=273+27=300\,K\]
    \[\therefore \]      \[\eta =\frac{400-300}{400}=\frac{100}{400}=0.25=25%\]
    Hence, 26% efficiency is impossible for a given heat engine.


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