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Which consequence results when a steam turbine's isentropic efficiency decreases?

A)Increased low-pressure blade erosion risk.
B)Decreased feedwater preheater outlet temperature.
C)Greater fuel consumption rate overall.
D)Reduced generator reactive power production.

💡 Explanation

Reduced isentropic efficiency implies greater irreversibilities during expansion; this increases the steam's specific enthalpy exiting the turbine because less energy gets converted to work via expansion. Therefore more fuel is needed to generate that steam, rather than maintaining power with lower consumption.

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