NEIEP Mechanics Practice Exam

What type of oil is generally used to lubricate a sleeve bearing?

1. Low viscosity oil

2. Medium viscosity oil

3. High viscosity oil

4. Water-based oil

The correct answer is: High viscosity oil

The appropriate type of oil to use for lubricating a sleeve bearing is typically high viscosity oil. This is due to its ability to maintain a stable lubricating film between the moving parts, which is critical for reducing wear and preventing metal-to-metal contact. High viscosity oils provide adequate thickness to the lubricant layer, which is essential for load-bearing applications like sleeve bearings. These oils also demonstrate better retention on surfaces and can effectively dampen vibrations and absorb shock loads, contributing to the overall longevity and efficiency of the bearing system. In contrast, low viscosity oil may not provide sufficient protection under high load conditions, while medium viscosity oil may not adequately support higher temperatures or loads as effectively as high viscosity oil. Water-based oils are generally inappropriate for sleeve bearings because they lack the necessary lubrication properties and can lead to corrosion or other damage to metal components.