Question: A reversible steady device operates between two thermal reservoirs, one at (390 mathrm{~K}) and one at (250 mathrm{~K}). If no work is done on the

A reversible steady device operates between two thermal reservoirs, one at $390 \mathrm{~K}$ and one at $250 \mathrm{~K}$. If no work is done on the device, what is the maximum value for the percentage of thermal energy input $Q_{\text {in }}$ converted to mechanical energy $W_{\text {out }}$ ? (Hint: Consider the entropy diagram of a reversible process and the change in entropy.)

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