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Which outcome results when irreversibilities increase during transcritical Rankine cycle operation?

A)Reduced first-law thermodynamic efficiency
B)Increased optimal working fluid pressure
C)Enhanced turbine blade service lifetime
D)Improved heat exchanger effective thermal conductance

💡 Explanation

Increased irreversibilities raise entropy generation, reducing energy available for work because the cycle deviates more from ideal conditions with less complete heat recovery, thereby decreasing first-law efficiency, rather than raising it or altering fluid pressures.

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