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← ScienceWhich risk increases when turbine bypass control fails closed in a combined cycle power plant?
A)Economizer tube dry-out occurs
B)Reheater steam enthalpy increases
C)Superheater tube overheating occurs✓
D)Condenser vacuum drastically decreases
💡 Explanation
Superheater tube overheating occurs because the steam flow is prematurely diverted; steam velocity decreases while heat input remains constant, therefore metal temperatures rise rather than being effectively cooled. Other components are less impacted.
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