EPA 608 Core · Refrigeration Fundamentals · Medium
What characterizes an azeotropic refrigerant blend (500-series)?
Answer: A. It boils at one temperature, like a pure fluid.
- AIt boils at one temperature, like a pure fluid.✓ Correct
- BIt has a large temperature glide when boiling.
- CIt must always be charged as a vapor.
- DIt is always highly flammable and toxic.
Why A is right
Azeotropic blends act as a single substance without fractionation or temperature glide.
More Core questions
- Which of the following is a natural refrigerant?
- How is subcooling measured?
- What does superheat measure?
- When does a PT chart give the actual temperature of a refrigerant from its pressure?
- What does refrigerant do inside the evaporator?
Go deeper with the study guide EPA 608 Core Exam: Study Guide for 2026, 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.