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← ScienceWhich outcome compromises turbine efficiency upon exceeding saturation temperature?
A)Boundary layer flow becomes turbulent
B)Isentropic expansion cools working fluid
C)Tip speed reaches the cavitation threshold
D)Superheating causes excessive material creep✓
💡 Explanation
Excessive operational temperature on turbines causes dislocations within the crystal structure, increasing material creep via thermomechanical stress rather than boundary-layer turbulence. This is because creep accelerates at high temperatures; therefore material yield strength reduces, rather than flow characteristics changing.
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