New York Low Pressure Boiler Certificate of Fitness (COF) Practice Test

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What indicates excessive vacuum readings in the suction line?

Low oil temperature
An obstruction
A leak
High pressure

The correct answer is: An obstruction

Excessive vacuum readings in a suction line generally indicate the presence of an obstruction. When there is an obstruction, it restricts the flow of fluid, which can cause the pressure to drop significantly as the pump tries to draw fluid from the source. This drop manifests as a lower pressure reading or a higher vacuum reading on the gauge, signaling that the suction line is not functioning properly. An obstruction can result from various issues such as a clog in the line, a closed valve, or even a filter that needs to be cleaned or replaced. In contrast, low oil temperature, a leak, or high pressure may lead to different systems or operational issues, but they do not directly correlate with excessive vacuum readings in the suction line in the same way an obstruction does.