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← ScienceWhich mechanism causes a turbine's efficiency to decrease when submerged in viscous oil?
A)Increased wall shear stress✓
B)Reduced hydrostatic pressure
C)Elevated fluid's kinetic energy
D)Decreased oil's boundary layer thickness
💡 Explanation
Increased wall shear stress occurs because *viscous friction* dissipates energy along the surface. Therefore, the mechanical power yielded decreases, rather than alternative consequences associated with ideal fluids at the turbine blades.
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