Which of the following is not a part of a bearing?

• A. Rolling Pin
• B. Inner and Outer Races
• C. Rolling Element
• D. Cage

Answer: (A)

A bearing is built from inner and outer races that form the tracks, rolling elements (such as balls or rollers) that move between those tracks to reduce friction, and a cage that keeps the rolling elements evenly spaced. The rolling pin has no role in bearing operation or construction; it’s simply a kitchen tool for flattening dough. The inner and outer races provide the surface for the rolling elements to roll on, the rolling elements do the actual rolling to lower friction and carry loads, and the cage ensures the elements stay separated and properly aligned. Some bearings may also include seals or shields and lubrication, but none of these definitions involve a rolling pin.