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Which effect occurs when lubricant viscosity decreases in journal bearings?

A)Increased asperity contact and friction
B)Improved hydrodynamic load support
C)Enhanced damping of shaft vibrations
D)Reduced oil film temperature gradient

💡 Explanation

Decreased viscosity leads to thinner oil films, weakening hydrodynamic lubrication. Hydrodynamic lubrication relies on Viscous Flow; therefore, increased asperity contact occurs because the oil film can no longer effectively separate surfaces, rather than maintaining separation with proper lubricant thickness.

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