Oilers/Plant Tenders (HHC) Civil Service Practice Exam

What fault would MOST likely cause a sudden increase in oil pressure in a lubricating line to a bearing?

1. A leak in the line

2. A clogged strainer

3. Worn-out bearings

4. A valve malfunction

The correct answer is: A clogged strainer

A clogged strainer would most likely cause a sudden increase in oil pressure in a lubricating line to a bearing. When a strainer becomes clogged, it restricts the flow of oil, leading to a buildup of pressure upstream of the obstruction. This sudden increase in pressure can potentially exceed the designed operating levels, creating issues such as oil leaks or damage to the pump or bearings due to excessive pressure. In contrast, a leak in the line would lead to a decrease in pressure, as the oil would escape from the system. Worn-out bearings would not typically cause an increase in pressure; they might allow for more clearance and therefore less resistance against the flow of oil. A valve malfunction could have varying effects depending on whether the valve is stuck open or closed, but in many cases, it might lead to fluctuations rather than a consistent, sudden rise in pressure. Hence, the scenario described aligns most closely with a clogged strainer causing increased pressure in the system.