Oilers/Plant Tenders (HHC) Civil Service Practice Exam

What type of oil is generally used in hand oiling compared to automatic lubricating systems?

1. A higher viscosity oil

2. An oil with higher flash point

3. A lower viscosity oil

4. Any type of oil

The correct answer is: A lower viscosity oil

The use of a lower viscosity oil in hand oiling as opposed to automatic lubricating systems is primarily due to its ability to flow easily into tight spaces and provide quick coverage to bearings and moving parts. Lower viscosity oils have a thinner consistency, which enables them to penetrate and lubricate effectively, especially in situations where manual application is required. Manual lubrication often demands that the oil be easily applied and spread over surfaces, and lower viscosity options fulfill that role well. In contrast, automatic lubricating systems tend to employ oils that are more specialized for specific applications, often favoring higher viscosity oils when required for better adhesion and protection under varying operating conditions. However, in hand oiling, the focus is on immediate lubrication and ease of application, making lower viscosity oils the more suitable choice. Thus, the emphasis on hand oiling typically aligns with the characteristics of lower viscosity oils, enhancing their functionality for tasks that require manual intervention.