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Which outcome occurs when a steam turbine's internal pressure unexpectedly drops below the saturation pressure at exhaust stage temperature?

A)Blades experience liquid droplet erosion
B)Turbine efficiency exceeds Carnot limit
C)Superheated steam phase becomes stable
D)Bearing lubrication improves significantly

💡 Explanation

Liquid droplet erosion increases rapidly due to homogeneous nucleation causing condensation of vapor into liquid droplets, because of the rapid expansion. Therefore, erosion is the consequence, rather than improved lubrication which needs stable condensation, or efficiency exceeding permitted levels.

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