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

Question: 1 / 440

Which type of grease does not contain any soap base?

Calcium grease

Petroleum grease

The correct choice refers to petroleum grease, which is distinct because it does not contain any soap base. Instead, petroleum grease is typically made from mineral oils thickened with non-soap additives. This characteristic allows for a smoother application and consistent performance under various conditions without the structural constraints that soap-based greases might impose.

The other types of grease listed are soap-based. Calcium grease contains calcium soap as a thickening agent, which provides good water resistance. Aluminum grease uses an aluminum soap base, making it effective for high-temperature applications. Complex grease involves advanced thickening agents (often a combination of soaps) to enhance performance in severe conditions. The presence of soap in those greases contributes to their properties, such as consistency and lubrication capability, but petroleum grease stands apart by using a different formulation.

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Aluminum grease

Complex grease

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