EPA 608 Core · Refrigeration Fundamentals · Hard
What causes fractionation in a zeotropic blend?
Answer: D. Its components leak at different rates.
- AThe oil absorbs one component faster than the others.
- BThe condenser is too small for the charge.
- CThe compressor runs too hot.
- DIts components leak at different rates.✓ Correct
Why D is right
Fractionation occurs when a blend leaks in the vapor state, altering its original chemical ratio.
More Core questions
- What characterizes an azeotropic refrigerant blend (500-series)?
- 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?
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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.