Oilers/Plant Tenders (HHC) Civil Service Exam 2026 – 400 Free Practice Questions to Pass the Exam

Question: 1 / 440

What are the two general classes of oils used for lubricating steam engines?

Heavy and light oils

Compounded and mineral oils

The two general classes of oils used for lubricating steam engines are compounded and mineral oils. Compounded oils refer to oils that have been blended with additives to enhance their properties, such as improving their ability to withstand high temperatures and reduce friction. This makes them especially effective for the demanding conditions of steam engines, which require reliable lubrication for optimal performance.

Mineral oils, on the other hand, are derived from refining crude oil and are commonly used due to their availability and cost-effectiveness. They provide essential lubrication but may lack some of the enhanced properties found in compounded oils.

By understanding the distinction between these classes, one can appreciate the importance of selecting the appropriate type of oil for different applications within steam engines to ensure efficiency and longevity.

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Synthetic and natural oils

Thin and thick oils

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