Oilers/Plant Tenders (HHC) Civil Service Practice Exam

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What is one of the primary roles of lubricating oil in machinery?

To act as a coolant
To provide structural support
To serve as an insulator
To filter impurities

The correct answer is: To act as a coolant

One of the primary roles of lubricating oil in machinery is to act as a coolant. As machines operate, they generate heat due to friction between moving parts. The lubricating oil circulates within the machinery, absorbing heat and helping to dissipate it, thus preventing overheating that can lead to equipment failure or decreased efficiency. This cooling effect is vital for maintaining optimal operating temperatures and prolonging the lifespan of the machinery. Additionally, while lubricating oil does have other functions, such as reducing friction and wear, its ability to manage and regulate temperature through heat absorption is one of its key roles in machinery operation.