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Which effect occurs on saturated steam when pressure drops impulsively below saturation following rapid turbine valve closure?

A)Violent formation of cavitation bubbles
B)Isoenthalpic expansion achieves superheating
C)Turbine blades experience thermal shock
D)Condensate subcooling decreases sharply

💡 Explanation

Uncontrolled pressure reduction leads to vapor bubble implosion, because the saturation temperature falls, leading to nucleate boiling rather than controlled condensation. This cavitation erodes material; therefore, understanding onset reduces damage risks rather than managing temperature gradients.

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