EPA 608 Type II · Leak Detection · Medium
Where is a leak most likely to occur in a belt-driven open compressor?
Answer: B. The rotating shaft seal.
- AThe discharge valve.
- BThe rotating shaft seal.✓ Correct
- CThe oil sight glass.
- DThe motor windings.
Why B is right
Open-drive compressors are prone to leaking at the rotating shaft seal, especially if not run regularly.
More Type II questions
- What gas is strictly used with a trace amount of refrigerant to leak test a system?
- What is the approved method to pinpoint a refrigerant leak after an electronic detector finds the general area?
- 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.