Oilers/Plant Tenders (HHC) Civil Service Practice Exam

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Which of the following statements about lubricants is true?

Lubricants that resist washing action are made from synthetic oils
Low-viscosity lubricants are best for high-speed machines
Electric motors require regular disassembly if they lack a pressure relief system
A gravity type lubricator feeds oil based on temperature

The correct answer is: Electric motors require regular disassembly if they lack a pressure relief system

The statement regarding electric motors requiring regular disassembly if they lack a pressure relief system emphasizes the importance of managing lubricant pressure to ensure efficient operation. When electric motors do not have a pressure relief system, they can face issues like excess pressure buildup due to heat or mechanical load, leading to potential leakage, overheating, or damage. Regular disassembly helps in maintaining and assessing the internal components, ensuring that lubrication systems are functioning effectively and that bearings and other parts are adequately lubricated. This preventive maintenance approach is crucial for the longevity and performance of electric motors, highlighting a core principle in managing mechanical systems properly. The other statements, while related to lubrication practices, do not accurately reflect the appropriate characteristics of lubricants or the operation of lubrication systems.