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Which outcome occurs when lubricating oil within a journal bearing exceeds thresholds?

A)Increased asperity contact and friction
B)Enhanced hydrodynamic film thermal conduction
C)Cavitation number decreases proportionally
D)Reduced viscosity increases squeeze film damping

💡 Explanation

Increased temperature reduces viscosity, leading to lubricant breakdown. Because of the lower viscosity causes allows increased asperity contact and friction due to less effective hydrodynamic lubrication; therefore, friction increases rather than decreased damping or thermal conduction under threshold conditions.

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