EPA 608 Core · Leak Detection · Hard
What is the most effective way to detect a massive system leak quickly?
Answer: A. Listen for hissing and look for oil stains.
- AListen for hissing and look for oil stains.✓ Correct
- BPull a deep vacuum and watch a micron gauge.
- CUse a halide torch on every joint.
- DInject UV dye and wait 24 hours.
Why A is right
Massive leaks often produce an audible hiss and leave visible oil residue behind.
More Core questions
- How does an ultrasonic leak detector find a leak?
- When searching for a leak with an electronic detector, how should the probe be moved?
- What gas should be used for safely pressurizing a system to leak test?
- Which leak detection method is best for pinpointing an exact leak location?
- What is a 'trace gas' used in leak detection?
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.