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NEET Sample Paper NEET Sample Test Paper-79

  • question_answer
    Three designs are proposed for an engine operating between 500 K and 300 K. For 1 kcal of heat input, design A claims to produce 3000  of work, design -B claims to produce 2000 J of work and design C claims to produce 1680 J of work. The design which is possible                                                                

    A)  Only A                        

    B)  Only B                                           

    C)  Only C                        

    D)  All of these

    Correct Answer: C

    Solution :

    \[\operatorname{Maximum} value of efficiency\,\,h=\,\,1-\frac{{{T}_{2}}}{{{T}_{1}}}\] \[=\,\,1-\frac{300}{500}=\frac{2}{5}\] \[\eta =\frac{W}{{{Q}_{1}}}\] \[W=\eta {{Q}_{1}}=\frac{2}{5}\times 1000\,\,cal\] \[=\,\, 400 \times  4.2 J =16803\]


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