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← ScienceWhich risk increases when a steam turbine operates off-design continuously?
A)Blade erosion by liquid re-entrainment✓
B)Increased cavitation damage to impeller
C)Rotor imbalance stresses increase severely
D)Thermal efficiency permanently reaches zero
💡 Explanation
Blade erosion risk increases because off-design operation creates regions of low pressure which allows for moisture formation via condensation during various stages of the cycle; therefore, liquid droplets impinge on turbine blades rather than remaining steam.
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