Oilers/Plant Tenders (HHC) Civil Service Practice Exam

Which factor can contribute to the degradation of lubricants over time?

1. Frequent use of machinery

2. Temperature fluctuations

3. Oxidation

4. All of the above

The correct answer is: All of the above

The correct answer is that all of the factors listed can contribute to the degradation of lubricants over time. Frequent use of machinery generates heat and causes physical and chemical stresses on lubricants. Continuous operation under high pressure can lead to the breakdown of the lubricant's molecular structure, reducing its effectiveness. Temperature fluctuations can significantly impact the viscosity and performance of lubricants. Extreme heat can cause a lubricant to thin, while cold temperatures can make it too thick, which can lead to inadequate lubrication and increased wear on machinery. Oxidation is a chemical reaction that occurs when lubricants are exposed to oxygen, especially at elevated temperatures. This process forms acids and other byproducts that can further degrade the lubricant, leading to reduced lubrication properties and the formation of sludge. Recognizing that all these factors—frequent use, temperature changes, and oxidation—interplay with one another helps in understanding the overall degradation process, highlighting the importance of regular monitoring and maintenance to optimize lubricant performance and extend machinery lifespan.