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Which outcome occurs when Carnot heat engine condenser temperature significantly increases?

A)Increased engine efficiency above theoretical limits
B)Decreased work output due to reduced gradient
C)Reversible isothermal expansion at higher pressure
D)Internal energy decrease raising efficiency

💡 Explanation

When condenser temperature increases, the temperature difference between hot and cold reservoirs decreases, thus lowering the engine's thermal efficiency per the Carnot cycle because efficiency relies on the temperature ratio. Therefore decreased work output occurs due to a smaller temperature gradient, rather than increased efficiency, isothermal expansion, or spontaneous cooling.

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