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Which consequence results when a Carnot engine's cold reservoir temperature drops below the phase transition of condensation?

A)Engine efficiency asymptotically approaches 100%
B)Refrigerant pressure inside engine reaches zero
C)Waste heat disposal becomes thermodynamically limited
D)The isentropic expansion ceases abruptly

💡 Explanation

Carnot efficiency increases with larger temperature differences; the decreasing cold reservoir temperature elevates the temperature ratio during heat exchange. Therefore, the engine efficiency increases, because the **Carnot efficiency** formula uses the temperature ratio, rather than a decreased heat energy exchange.

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