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Why is the efficiency of Rankine cycle less than that of Carnot cycle?

Why is the efficiency of Rankine cycle less than that of Carnot cycle? Correct Answer Because all the heat is not supplied at upper temperatures

The efficiency of Rankine cycle is less than that of Carnot cycle because all the heat is not supplied at upper (higher) temperatures. However, is has a high work ratio and its steam consumption is less than Carnot cycle.

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