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Which consequence results when an oscillating control valve causes periodic vapor bubble collapse in a hydroelectric turbine?

A)Surge tank water hammer
B)Blade material cavitation erosion
C)Increased penstock static pressure
D)Generator stator winding overheating

💡 Explanation

Material loss occurs because energy released during vapor bubble collapse in cavitation erosion creates intense, localized micro-jetting. Therefore, the blade erodes, rather than causing pressure surges because surge tanks protect against that.

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