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Which mechanism causes decreased heat transfer efficiency during steam turbine operation?

A)Surface condensation forms an insulating layer
B)Increased steam venturi turbulent flow
C)Superheated steam accelerates blade fatigue
D)Steam autoignition generates excess enthalpy

💡 Explanation

Surface condensation causes a loss of heat transfer because filmwise condensation forms an insulating layer on turbine blades; therefore, heat transfer decreases because of thermal resistance, rather than improved convective heat transfer.

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