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Which performance decrease occurs when a turbine in a combined cycle plant experiences steam desuperheating before its intended operational phase transition?

A)Increased isentropic efficiency loss
B)Reduction of NOx formation rates
C)Higher blade erosion uniformity
D)Decreased condenser heat rejection

💡 Explanation

Premature steam desuperheating hinders turbine efficiency because the **Rankine cycle** design relies on the superheated phase to maximize work extraction; therefore, insufficient high-energy superheated steam reduces efficiency, rather than alternatives impacting emissions or mechanical action.

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