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← ScienceWhich outcome reduces efficiency in supercritical Rankine cycles?
A)Isentropic expansion deviates from ideal✓
B)Condenser subcooling increases liquid enthalpy
C)Turbine blade erosion reduces cross-section
D)Feedwater pump lacks sufficient NPSH
💡 Explanation
Reduced efficiency arises when isentropic expansion deviates from the ideal through irreversibilities like friction, causing entropy increase because power output decreases, therefore lowering cycle thermal efficiency, rather than condenser issues or pump cavitation that affect mass throughput.
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