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← ScienceWhich outcome occurs when a heat engine operates irreversibly?
A)Reduced efficiency extracting work output✓
B)Increased thermal energy input needs
C)Reduced entropy change remains constant
D)Constant energy converting into momentum
💡 Explanation
Reduced efficiency occurs because irreversibility causes entropy generation due to microscopic friction and thermal gradients using the Second Law. Therefore, less work exits the engine output rather than operating reversibly and maximizing conversion.
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