Oilers/Plant Tenders (HHC) Civil Service Practice Exam

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Which of the following is NOT a function performed by lubricants in a diesel engine?

Cooling engine components
Acting as a vibration absorber
Reducing friction
Sealing gaps

The correct answer is: Acting as a vibration absorber

Lubricants play a crucial role in the functioning of a diesel engine, and each of the listed options highlights a common function of lubricating fluids, except for one. Lubrication serves to reduce friction between moving parts, which minimizes wear and tear on engine components. This is essential for maintaining engine efficiency and extending its lifespan. Cooling engine components is another critical function, as lubricants help dissipate heat generated during combustion and friction, thereby preventing overheating and potential damage to engine parts. Sealing gaps is also a notable function of lubricants. They can help create a seal between components, which prevents the escape of gases and oil, contributing to overall engine efficiency and performance. Acting as a vibration absorber is not a primary function of lubricants. While lubricants do contribute slightly to dampening vibrations due to their viscous nature, this is not a designated or significant role compared to the other functions mentioned. Hence, this makes it the correct choice for the function that is NOT primarily associated with lubricants in a diesel engine.