Elevator Mechanic Practice Exam

If a motor needs a sleeve bearing replaced, what type of bearing is required?

1. Friction bearing AKA Sleeve bearing

2. Anti-friction bearing AKA Ball bearing

3. Hydraulic bearing

4. Magnetic bearing

The correct answer is: Friction bearing AKA Sleeve bearing

The correct answer is indeed a sleeve bearing, also known as a friction bearing. When dealing with the replacement of a sleeve bearing in a motor, it's important to use the same type of bearing to ensure compatibility and optimal functionality. Sleeve bearings operate on the principle of sliding motion between the bearing and the shaft, relying on a film of lubricant to minimize friction. Using an anti-friction bearing (ball bearing), hydraulic bearing, or magnetic bearing would not be appropriate in this case, as they operate on different principles and are designed for distinct applications. Anti-friction bearings reduce friction through rolling elements and generally require different mounting configurations and housing. Hydraulic bearings use fluid dynamics for support, while magnetic bearings rely on electromagnetic forces. Each of these bearing types serves specific purposes, so replacing a sleeve bearing with one of these alternatives would likely lead to performance issues or even damage.