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← ScienceWhich outcome occurs when a Carnot engine operates with irreversible processes present?
A)Efficiency decreases below ideal Carnot limit✓
B)Reversed operation becomes more efficient
C)Isothermal heat transfer occurs adiabatically
D)Entropy generation approaches zero asymptotically
💡 Explanation
When irreversible processes are present, entropy increases within the engine cycle because irreversibilities like friction dissipate energy as heat, reducing the net work output. Therefore efficiency decreases below the ideal Carnot limit, rather than increased efficiency, adiabatic heat transfer, or entropy minimization, which violate laws of thermodynamics.
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