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Which performance limit results if a Carnot engine's cold reservoir remains thermally isolated?

A)Isothermal expansion becomes adiabatic
B)Efficiency decreases to zero
C)Heat input increases exponentially
D)Isochoric cooling replaces isobaric

💡 Explanation

Because maintaining a constant cold reservoir temperature enables optimal heat rejection via isothermal compression within the Carnot cycle’s operation; thermal isolation will disrupt this, causing temperature equalization via heat leakage, therefore efficiency declines significantly, rather than specific state changes.

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