Which outcome occurs when lubrication oil degrades in bearings?

💡 Explanation

Increased frictional heat occurs due to increased contact, degrading lubricant increases viscosity and reduces its ability protect surfaces, therefore increasing friction and thus heat; reduced protection is preferred rather than film stability which needs controlled flow.

• Which risk increases when a high-temperature Polymer Electrolyte Membrane (PEM) fuel cell operates with insufficient humidification?
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