Discussion
The rolling contact bearing are known as:
Answer: D
Rolling contact bearings are known as antifriction bearings.
Ball and roller bearings carry the load on rolling elements instead of a sliding surface. Rolling friction is much lower than sliding friction, especially at starting, so they are called antifriction bearings.
Thick and thin lubricated bearings are sliding (plain or journal) bearings, classed by the lubricant film between shaft and bush. Plastic bearings are plain bushes made of nylon or PTFE, again sliding rather than rolling.
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