What are the two ranges indicated on the lubricating oil site glass?

The correct understanding of the two ranges indicated on the lubricating oil site glass is that they refer to the levels of oil present in the system. Typically, lubricating oil systems have markers that show whether the oil level is within an acceptable operating range for the equipment to function correctly.

The terms commonly used are "Full" and "Low," which indicate whether the oil level is sufficient for proper lubrication or if it has dropped to a level that could potentially cause harm to the machinery. This distinction is critical because maintaining the correct oil level is essential to ensure adequate lubrication, which helps prevent equipment wear, overheating, and failure.

In contrast, the choices suggesting terms like "Active and inactive," "Runway and stopped," or "Normal and abnormal" do not accurately represent how oil levels are conveyed on a site glass. They do not reflect the functional state of the lubricating oil nor its adequate or inadequate levels, which the full and low indicators precisely communicate. Understanding this distinction is vital for anyone working with machinery and its maintenance.