What is a primary benefit of using proper lubrication in bearings?

• A. Increases friction
• B. Reduces heat generation and wear
• C. Increases load requirements
• D. Increases electrical resistance

Answer: (B)

Proper lubrication in bearings creates a protective film between the moving surfaces, which keeps metal from rubbing directly against metal. That film greatly lowers friction, so less energy is turned into heat and the bearing runs cooler. With reduced friction and separated surfaces, wear slows down and the bearing lasts longer. In short, lubrication minimizes both heat generation and wear, which is why it’s the primary benefit.

The other ideas don’t fit as the main benefit. Lubrication doesn’t increase friction; it does the opposite. It also doesn’t set a higher load requirement as a primary purpose—the film can help carry some load, but that isn’t the main advantage highlighted here. And increasing electrical resistance isn’t the central reason lubrication is used in bearings, even though some lubricants can be chosen for electrical insulation in specific cases.