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Which outcome creates instability within a Rankine cycle?

A)Decreased turbine blade tip clearance
B)Superheated steam quality decreases rapidly
C)Condenser backpressure rapidly escalates upwards
D)Feedwater pump experiences net positive suction

💡 Explanation

Increased condenser backpressure destabilizes the cycle because it reduces the temperature differential; this effect lowers thermal efficiency through reduced steam expansion, a phenomenon called entropy generation in the condenser, therefore instability, rather than improved performance alternatives, happens under specific control conditions.

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