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Which irreversibility most reduces rated performance of a Carnot heat engine operating between fixed temperature reservoirs?

A)Friction losses within the working components
B)Heat conduction through poorly insulated walls
C)Joule-Thomson effect during gas expansion
D)Eddy current losses in magnetic bearings

💡 Explanation

When heat conducts directly through finite thickness insulation, it bypasses the intended isothermal heat transfer reducing the temperature differential because leaked energy dilutes heat source or accumulates into radiator. Therefore conductivity losses result in much lower performance relative to other irreversibilities such as flow and Joule losses.

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