Which outcome occurs when regenerative cycle steam turbine operates with degraded feedwater preheating system?

💡 Explanation

When feedwater preheating is degraded, extraction steam cools in the low-pressure turbine thereby reducing average temprature during heat transfer, which decreases the cycle thermal efficiency due to greater heat rejection to the condenser. Therefore, cycle thermal efficiency decreases results, rather than higher component temperatures, reduced cooling demand, or blade vibrations all of which require other failures.

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