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← ScienceWhich outcome limits the maximum efficiency of a Carnot heat engine due to entropy increase?
A)Isothermal expansion at high temperature
B)Adiabatic compression at low temperature
C)Heat rejection to the cold reservoir✓
D)Friction losses in mechanical components
💡 Explanation
When heat is rejected to the cold reservoir, irreversible entropy increase lowers the engine's ability to convert heat into work due to the second law of thermodynamics. Therefore, heat rejection limits efficiency, rather than isothermal expansion, adiabatic compression, or mechanical friction, which contribute in different ways.
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