EPA 608 Core · Substitute Refrigerants & Oils · Easy
What does 'hygroscopic' mean regarding refrigeration oils?
Answer: C. It has a high affinity for absorbing water.
- AIt boils at extremely low temperatures.
- BIt acts as a strong electrical insulator.
- CIt has a high affinity for absorbing water.✓ Correct
- DIt does not mix with refrigerants.
Why C is right
Hygroscopic oils act like sponges for moisture, requiring careful handling to keep them dry.
More Core questions
- Can mineral oil be used to retrofit a CFC system to an HFC refrigerant?
- What oil is most commonly used in ternary blends containing HCFCs?
- Which refrigerant is approved as an exempt substitute for new household fridges?
- Which type of oil is most commonly used with HFC refrigerants?
- Which oil is primarily used in automotive HFC-134a AC systems?
Go deeper with the study guide A2L Refrigerants and the R-410A Transition: A Tech’s Guide, 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.