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  1. A cyclic engine exchanges heat with two reservoirs maintained at 100 and 300°C respectively. The maximum work (in J) that can be obtained from 1000 J of heat extracted from the hot reservoir is

    2. A.

     349
    B.

     651
    C.

     667
    D.

     1000

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    Answer : Option A

    Explanation :

    Since to obtain the maximum work we have to use an reversible heat engine for an reversible heat engine operating between two reservoirs the efficiency is given by:
    ιη=WQ1=T1−T2T1⇒W=1000(300−100573)⇒W=349J
    Here T1 and T2 are temperatures in thermodynamic scale or kelvin temperatures.

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