Oilers/Plant Tenders (HHC) Civil Service Practice Exam

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What type of oil is typically proper for machinery bearings operating at 25°F?

S.A.E. 20 oil
S.A.E. 30 oil
S.A.E. 40 oil
S.A.E. 50 oil

The correct answer is: S.A.E. 30 oil

In machinery bearings operating at lower temperatures, such as 25°F, it is crucial to select an oil that maintains adequate viscosity to ensure proper lubrication without becoming too thick to flow. S.A.E. 30 oil is specifically formulated to provide effective lubrication under these temperature conditions, striking a balance between viscosity and the ability to flow easily. At 25°F, using an oil with too high a viscosity, like S.A.E. 40 or S.A.E. 50, could impede the oil's ability to circulate effectively, increasing wear and leading to potential damage in the bearings. Conversely, while S.A.E. 20 oil could also flow well at lower temperatures, it may not provide sufficient viscosity protection as machinery operates, especially under load. Therefore, S.A.E. 30 oil is the most suitable choice for maintaining optimal performance in machinery bearings at 25°F.