Lubricant used for ball bearing is usually___________?
Correct answer: B. grease
- A. graphite
- B. grease
- C. mineral oil
- D. molasses
Explanation
Grease is normally packed into ball bearings because it remains in place and provides both lubrication and sealing against dust. Mineral oil is used in some high-speed or specially designed bearing systems, but not usually for standard ball bearings.
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