Oilers/Plant Tenders (HHC) Civil Service Practice Exam

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In mechanical systems, which is a common cause of unexpected wear on bearings?

Incorrect oil viscosity
Regular maintenance
Sufficient lubrication
Proper installation

The correct answer is: Incorrect oil viscosity

Unexpected wear on bearings is often caused by incorrect oil viscosity because the viscosity of the lubricant significantly impacts the formation of a protective film between the bearing surfaces. If the lubricant is either too thick or too thin, it can lead to inadequate lubrication. For example, if the oil is too viscous, it may not flow freely enough to reach critical areas, which can result in metal-to-metal contact and increased friction. Conversely, if the oil is too thin, it may not provide sufficient film strength, allowing for wear particles to embed in the bearing surfaces. Thus, maintaining the correct oil viscosity is essential to prevent premature wear and ensure the longevity of the bearings. Regular maintenance, sufficient lubrication, and proper installation are all practices that contribute positively to the performance and lifespan of bearings, thereby reducing the likelihood of unexpected wear.