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Which outcome occurs when exceeding the pressure limit within a Rankine power cycle?

A)Turbine blade cavitation increases rapidly
B)Condenser vacuum significantly decreases
C)Boiler efficiency sharply improves
D)Pump's NPSH margin widens safely

💡 Explanation

Exceeding pressure limits causes localized boiling and collapse within the turbine because *vapour-filled cavities* create microjets during implosion that erode the blades by cavitation; therefore, cavitation increases, rather than improved efficiency, as superheated steam and pressure imbalance degrades turbine function earlier.

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