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← ScienceWhich outcome occurs when an engine's lubricant degrades?
A)Increased friction raises operating temperature✓
B)Reduced pressure allows greater volumetric expansion
C)Higher viscosity results in less power
D)Decreased cooling reduces thermal efficiency
💡 Explanation
Increased friction occurs when the lubricant degrades because boundary lubrication replaces hydrodynamic lubrication decreasing load support; therefore, temperature increases rather than pressure increase or altered viscosity, because frictional heat dominates.
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