The main purpose of lubrication is to

• A. Reduce corrosion on metal surfaces
• B. Reduce wear and heat between contacting surfaces in relative motion
• C. Provide a seal against gas leakage
• D. Wash away debris from the bearing surfaces

Answer: (B)

Lubrication’s main job is to minimize friction by keeping moving surfaces separated with a lubricant film. This film reduces resistance, lowers the heat generated by sliding or rolling contact, and helps prevent metal-to-metal wear. In bearings and gears, maintaining that film keeps parts moving smoothly and lasts longer. While lubricants can offer some corrosion protection and help carry away tiny particles, those are secondary benefits; lubrication is not primarily about sealing leaks or washing away debris.