EPA 608 Core · Leak Detection · Easy
How does an ultrasonic leak detector find a leak?
Answer: A. It senses the high-pitched sound of escaping gas.
- AIt senses the high-pitched sound of escaping gas.✓ Correct
- BIt reacts to chlorine in the refrigerant.
- CIt makes the leak glow under a UV lamp.
- DIt measures the change in system superheat.
Why A is right
Gas forced through a small opening makes a high-frequency sound that the detector picks up, whatever the refrigerant. It works best on pressurized systems in quiet surroundings.
More Core questions
- 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?
- What is the most effective way to detect a massive system leak quickly?
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.