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Which consequence arises when a Carnot heat engine's working fluid cannot completely condense during the isothermal heat rejection?

A)Engine efficiency will drastically diminish
B)Internal energy increases uncontrollably
C)Maximum possible power output increases
D)Cycle irreversibility remains nearly unchanged

💡 Explanation

Reduced condensation impairs isothermal heat rejection, because incomplete phase change elevates the low temperature; this reduces the temperature difference and thus engine efficiency. Therefore, the efficiency decreases, rather than remaining the same. Other parameters have a weaker correlation.

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