Oilers/Plant Tenders (HHC) Civil Service Practice Exam

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What type of oils are steam-cylinder oils classified as?

Light-bodied oils
Residual, heavy-bodied oils
Standard mineral oils
Synthetic oils

The correct answer is: Residual, heavy-bodied oils

Steam-cylinder oils are classified as residual, heavy-bodied oils due to their unique properties that cater to specific operating conditions. These oils are formulated to withstand high temperatures and pressures associated with steam engines and machinery. The "heavy-bodied" characteristic indicates that these oils have a higher viscosity, allowing them to maintain a stable film on surfaces even under extreme conditions. This property is important for reducing wear and tear on components that experience significant friction and heat. In contrast to lighter oils, which might evaporate or break down under high heat, residual, heavy-bodied oils are designed to provide superior lubricating and cooling properties. They typically contain additives that enhance their performance and resistance to oxidation and foaming, making them highly effective for their intended applications. This classification ensures that they perform reliably in demanding environments, which is essential for maintaining the efficiency and longevity of steam machinery.