Oilers/Plant Tenders (HHC) Civil Service Practice Exam

What is true about the oil used in a ring-oiled bearing?

1. It runs at a lower temperature than force feed lubrication

2. It generally runs at a higher temperature than with force feed lubrication

3. It absorbs less heat

4. It is more viscous

The correct answer is: It generally runs at a higher temperature than with force feed lubrication

In the context of a ring-oiled bearing, the correct assertion revolves around its operational temperature in comparison to force feed lubrication systems. Ring-oiled bearings typically run at a higher temperature than those utilizing force feed lubrication. This is largely due to the way lubrication is distributed. In force feed lubrication systems, oil is actively pumped under pressure to the bearing surfaces, ensuring efficient cooling and consistent lubrication, which generally helps maintain lower operating temperatures. Conversely, ring-oiled systems rely on a passive flow of oil provided by gravity and the rotation of the bearing, which can result in less effective cooling and higher operating temperatures. Understanding this principle is essential for plant tenders as it affects the performance and maintenance requirements of the equipment, ultimately influencing its efficiency and longevity. Additionally, the nature of the oil film formed within the bearing environment contributes to heat generation; a lower flow rate in ring-oiled systems can lead to less effective heat dissipation, thereby increasing temperatures.