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Two carnot engines A and B are operates ...

Two carnot engines A and B are operates in series. The first one A receives heat at 800 K and rejects to a reservoir at temperature TK. The second engine B revives the heat rejected to a heat reservoir at 300 K. calculate the temperature TK for the following cases.
(i) When the outputs of the two engines are equal.
(ii) When the efficiencies of the two engines are equal.

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