Oilers/Plant Tenders (HHC) Civil Service Practice Exam

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Prepare for the Oilers/Plant Tenders (HHC) Civil Service Exam. Practice with flashcards and multiple-choice questions. Each question includes helpful hints and explanations. Gear up to ace your exam!

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The purpose of adding an inhibitor to lubricating oil is to __________ the engine.

Enhance fuel efficiency
Prevent wear on the engine components
Prevent sludge and varnish formation on parts of the engine
Increase oil viscosity

The correct answer is: Prevent sludge and varnish formation on parts of the engine

Adding an inhibitor to lubricating oil serves several important functions, helping to ensure the proper performance and longevity of the engine. When an inhibitor is added, it primarily functions to prevent issues such as sludge and varnish accumulation on the engine components. The formation of sludge and varnish can lead to decreased efficiency and can obstruct moving parts, which may ultimately result in engine damage or malfunction. Inhibitors work by neutralizing acids, reducing oxidation, and keeping particulates dispersed throughout the oil, which helps to maintain cleaner engine parts and enhances overall engine performance. While enhancing fuel efficiency, preventing wear, and adjusting oil viscosity are essential considerations in engine maintenance, the most direct role of inhibitors concerns the cleanliness of engine components, making the prevention of sludge and varnish formation the key purpose of adding these additives to lubricating oils. This is crucial for ensuring that the engine operates smoothly and efficiently over time.