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← ScienceWhich constraint sets maximum theoretical efficiency during isothermic expansion of a Carnot engine?
A)System's entropy increases irreversibly✓
B)Internal energy remains constant
C)Enthalpy equals exhaust energy
D)Exhaust heat increase is necessary
💡 Explanation
Maximum Carnot efficiency occurs only with reversible processes; irreversible processes cause the working fluid entropy to always increase during expansion because the real heat transfer introduces slight inefficiencies; therefore, efficiency decreases rather than maximizing with different conditions.
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