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CET Karnataka Medical CET - Karnataka Medical Solved Paper-2007

  • question_answer
    A Carnots engine operates with source at \[{{127}^{0}}C\]and sink at\[27{}^\circ C\]. If the source supplies 40 kJ of heat energy, the work done by the engine is

    A)  30 kJ

    B)  10 kJ

    C)  4 kJ

    D)  1 kJ

    Correct Answer: B

    Solution :

    Efficiency\[\eta =1-\frac{{{T}_{2}}}{{{T}_{1}}}\] \[=1-\frac{(273+27)}{(273+127)}\] \[=1-\frac{300}{400}\] \[=\frac{1}{4}\] \[\eta =\frac{\text{Work}\,\text{done}\,}{\text{Heat}\,\text{supplied}}\] \[\frac{1}{4}=\frac{\text{W}\,}{40}\] \[\Rightarrow \] \[W=10kJ\]


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