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Which limitation dictates maximum efficiency of a Carnot heat engine operating between two thermal reservoirs?

A)Entropy generation during irreversible processes
B)Kinetic energy loss due to fluid viscosity
C)Thermal conductivity of engine materials
D)Specific heat capacity of working fluid

💡 Explanation

When a Carnot engine operates, entropy generation during processes prevents reaching ideal reversibility because real-world processes like friction generate entropy locally, increasing the system's energy unavailable for work. Therefore, entropy generation limits efficiency, unlike viscosity, conductivity or specific heat capacity, which are less fundamental to thermodynamic limits.

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