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Railways NTPC (Technical Ability) Thermodynamics Question Bank Thermodynamics

  • question_answer
    A reversible heat engine operating between hot and cold reservoirs delivers a work output of 54 kJ white it rejects a heat of 66 kJ. The efficiency of this engine

    A) 0.45                             

    B) 0.66             

    C) 0.75                             

    D) 0.82      

    Correct Answer: A

    Solution :

    \[W=+\,54\,\,kJ,\] \[{{Q}_{2}}=-\,66\,\,kJ\] \[{{Q}_{1}}=W-{{Q}_{2}}=54+66=120\,\,kJ\] Efficiency, \[\eta =\frac{W}{{{Q}_{1}}}=\frac{54}{120}=0.45\]


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