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← ScienceWhich 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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