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Which outcome occurs when oil's viscosity decreases within a journal bearing?

A)Increased bearing wear at high speeds
B)Reduced frictional heat generation overall
C)Enhanced lubricant film load capacity
D)Greater damping of shaft vibrations

💡 Explanation

Decreased viscosity allows thinner oil films; boundary lubrication prevails because fluid film lubrication diminishes; therefore, increased bearing wear occurs at higher speeds due to asperity contact, rather than cooler temperatures, superior load capacity, or greater damping.

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