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← ScienceWhich 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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