Which of the following is a plain bearing designed for linear motion?

• A. Journal Bearing
• B. Thrust Bearing
• C. Linear Bearing
• D. Ball Bearing

Answer: (C)

Plain bearings designed for straight-line movement rely on sliding contact between surfaces to guide a component along a straight path, often with lubrication to reduce wear. Journal bearings are plain bearings too, but they’re meant for rotating shafts, not linear motion. Thrust bearings handle axial loads in rotary machinery, not linear guides. Ball bearings use rolling elements to reduce friction and are typically used for rotary motion. The one that specifically matches a plain bearing for linear motion is the linear bearing, which is designed to support and guide linear travel along a straight axis.