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← ScienceWhich impact occurs when increasing steam turbine blade RPM beyond design?
A)Reduced Carnot cycle thermal efficiency
B)Increased turbine power output linearly
C)Increased blade-tip supersonic shock risk✓
D)Stall in the converging-diverging nozzle
💡 Explanation
Shock waves form because exceeding designed RPM causes blade tips to approach the speed of sound; therefore, increased blade-tip shock risk raises stresses, rather than simply reducing Carnot cycle efficiency, because that is determined by operating temperatures.
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