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Which risk increases when a fluid's temperature rises inside a journal bearing?

A)Increased thermal fatigue reduces bearing life
B)Lubricant film thickness reduces causing wear
C)Elastic deformation leads to plastic yield
D)Increased vibration caused by shaft imbalance

💡 Explanation

Rising fluid temperature reduces the lubricant’s viscosity. This thinning decreases film thickness by viscous dissipation, therefore boundary lubrication increases causing wear, rather than thermal fatigue; decreased viscosity also mitigates vibration.

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