Oilers/Plant Tenders (HHC) Civil Service Practice Exam

What characteristic is important for oils used in high-speed machinery?

1. Low lubrication rate

2. Low friction coefficient

3. High lubricating film strength

4. High pour point

The correct answer is: High lubricating film strength

The characteristic that is essential for oils used in high-speed machinery is high lubricating film strength. This property ensures that the oil can form a robust film between moving parts, which is crucial in a high-speed environment where parts are subjected to significant pressure and wear. A strong lubrication film minimizes metal-to-metal contact, reducing friction and the potential for overheating or damage due to high speeds. In high-speed machinery, where components may operate under extreme conditions, such as high temperature and pressure, maintaining a reliable lubricating layer prevents excessive wear and tear. This is particularly important because inadequate lubrication can lead to breakdowns and failure of the machinery over time. While factors like a low friction coefficient and low lubrication rate are also beneficial in terms of reducing energy loss and improving efficiency, the primary requirement is the oil's ability to maintain a protective film under operational stresses. A high pour point is generally not an asset in high-speed applications, as it can impede the oil's ability to flow and provide adequate lubrication at elevated temperatures.