EPA 608 Core · Dehydration & Evacuation · Medium
If a micron gauge rises to atmospheric pressure after the pump is off, what does it mean?
Answer: D. There is a leak in the system.
- AThere is moisture still boiling off.
- BThe system is perfectly tight.
- CThe compressor oil is out-gassing.
- DThere is a leak in the system.✓ Correct
Why D is right
A rapid continuous rise to 0 psig (atmospheric) indicates outside air is leaking in.
More Core questions
- If a micron gauge rises and then levels off (e.g., at 2000 microns), what does it mean?
- What is the primary purpose of evacuating a refrigeration system?
- What chemical is formed when moisture mixes with CFC or HCFC refrigerants?
- What tool is required to accurately measure a deep vacuum?
- What is the standard target vacuum level for system dehydration?
Go deeper with the study guide EPA 608 Evacuation Levels: The Required Vacuum by Appliance, try the free 10-question test or browse all EPA 608 practice questions.
A practice question written for study, checked against 40 CFR Part 82, Subpart F. It is not an official EPA exam question, and this site is not affiliated with the U.S. EPA.