Oilers/Plant Tenders (HHC) Civil Service Practice Exam

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What type of oil is usually added to a compounded lubricating oil?

Mineral oil
Animal fat
Lard oil
Vegetable oil

The correct answer is: Lard oil

Compounded lubricating oils generally incorporate mineral oil due to its desirable properties, such as providing excellent lubrication, stability, and resistance to oxidation. Mineral oil acts as the base stock in most lubricating oil formulations and is used for its ability to blend well with various additives that enhance performance, such as detergents, anti-wear agents, and antioxidants. While animal fats (including lard oil) and vegetable oils can be used in some specialty applications or in biodegradable or environmentally friendly products, they are not the typical base oils for compounded lubricating oils. Instead, those are often supplements in specific formulations. Lard oil, derived from hog fat, is not commonly used in standard lubricating oil applications because synthetic and mineral oils offer better performance characteristics and broader temperature stability. Therefore, mineral oil is the primary choice for compounded lubricating oils because it provides the necessary operational efficiency and helps enhance the lifespan of machinery.