Oilers/Plant Tenders (HHC) Civil Service Practice Exam

What is an essential property that a good lubricant should have?

1. High volatility

2. Low thermal conductivity

3. Poor adhesion

4. Good lubrication capability

The correct answer is: Good lubrication capability

A good lubricant is fundamentally designed to reduce friction between surfaces in motion and, therefore, its primary essential property is good lubrication capability. This property ensures that the lubricant can effectively form a protective film between moving parts, minimizing wear and tear and preventing metal-to-metal contact. This capability is critical as it also aids in heat dissipation, reduces energy losses, and prolongs the life of machinery. High volatility is not desirable in lubricants as it leads to rapid evaporation and loss of efficacy. Low thermal conductivity is typically not a requisite property for a lubricant; in fact, moderate thermal conductivity can be beneficial as it helps in heat transfer. Poor adhesion would hinder the lubricant's ability to remain on the surface, which would be counterproductive to its purpose. Thus, the emphasis on good lubrication capability directly correlates to the lubricant's effectiveness in fulfilling its role within machinery and equipment.