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← ScienceWhich risk increases when a Carnot engine with fixed thermal reservoirs approaches reversible operation?
A)Decreased power output efficiency
B)Increased operating cycle duration✓
C)Reduced magnitude heat transfer
D)Elevated engine physical dimensions
💡 Explanation
As a Carnot engine approaches reversibility, the isothermal processes performed during its cycles approach infinitesimally slow rates; this causes a practical infeasibility because real-world timescales cannot permit such slow operation; therefore, cycle duration increases rather than decreased power; other parameters are more related to deviation.
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