Oilers/Plant Tenders (HHC) Civil Service Practice Exam

Which of the following is NOT an anti-friction bearing?

1. Ball Bearing

2. Roller Bearing

3. Helical Bearing

4. Thrust Bearing

The correct answer is: Helical Bearing

The correct choice is the helical bearing, which is not classified as an anti-friction bearing. Anti-friction bearings are designed to reduce friction between moving parts and typically include ball bearings, roller bearings, and thrust bearings. These bearings use rolling elements, such as balls or rollers, to facilitate smooth rotation and movement, thereby minimizing wear and energy loss due to friction. On the other hand, a helical bearing typically refers to a type of bearing that engages with threaded or helical elements, often used in applications involving linear motion or torque transmission rather than the reduction of friction. Since its primary function does not center on reducing friction in the same manner as other bearing types, it stands apart from the classification of anti-friction bearings. Understanding the purpose and mechanism of each bearing type helps clarify their respective roles in mechanical systems.