EPA 608 Type II · Leak Detection · Easy
What gas is strictly used with a trace amount of refrigerant to leak test a system?
Answer: D. Dry nitrogen.
- ACompressed air.
- BCarbon dioxide.
- CPure R-22.
- DDry nitrogen.✓ Correct
Why D is right
Dry nitrogen with a trace amount of the system's refrigerant is used to safely find leaks.
More Type II questions
- What is the approved method to pinpoint a refrigerant leak after an electronic detector finds the general area?
- Where is a leak most likely to occur in a belt-driven open compressor?
- Can you pipe two pressure relief valves in series?
- What prevents refrigerant from migrating to the compressor oil during the off-cycle?
- Why must you never start a hermetic compressor while it is in a deep vacuum?
Go deeper with the study guide AIM Act 2026: The HFC Leak Repair Rules for HVAC Techs, 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.