Oilers/Plant Tenders (HHC) Civil Service Practice Exam

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Which term is used to describe lubricating oil made from animal, vegetable, or fish sources?

Synthetic oil
Fixed oil
Mineral oil
Compound oil

The correct answer is: Fixed oil

The term that refers to lubricating oil derived from animal, vegetable, or fish sources is fixed oil. Fixed oils are characterized by their ability to remain in a liquid state at room temperature and do not evaporate like volatile oils. These oils are often used for lubrication purposes due to their natural composition, providing certain desirable properties such as biodegradability and good lubricating qualities. Synthetic oil, on the other hand, is chemically engineered and designed to have specific properties, typically from petrochemical sources rather than organic. Mineral oil is derived from the distillation of crude oil, not organic sources. Compound oil usually refers to oils that are formulated with various additives to enhance performance, rather than being sourced directly from natural animal, vegetable, or fish materials. Understanding these distinctions helps clarify why fixed oil is the appropriate choice for this question.