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Which limit decreases hydroelectric turbine efficiency during river water phase transitions?

A)Increased blade-tip cavitation erosion
B)Reduced magnetic field alignment torques
C)Decreased penstock wall pressure uniformity
D)Enhanced generator stator winding resistance

💡 Explanation

Increased blade-tip cavitation erosion reduces turbine efficiency via vaporization near the blades. This thermodynamic effect impacts fluid momentum because vapor bubbles collapse violently, therefore eroding the turbine rather than affecting magnetic fields or penstock pressure.

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