EPA 609 Refrigerant Types & Properties 3

Question 1

Which term describes the process where a refrigerant blend separates into its component gases during a leak?

Accepted Answer

Fractionation

Answer

Fractionation occurs when blend refrigerants leak, causing components with different boiling points to escape at different rates, changing the mixture's composition.

Question 2

What is the ASHRAE safety classification of R-134a?

Accepted Answer

A1 (non-toxic, non-flammable)

Answer

R-134a is classified A1 by ASHRAE, indicating it has low toxicity and is non-flammable under normal conditions.

Question 3

At what temperature does R-134a become a gas in an MVAC system's evaporator?

Accepted Answer

Above its boiling point at the low-side operating pressure

Answer

Refrigerant boils and becomes a gas in the evaporator when the temperature exceeds its boiling point at the prevailing low-side pressure.

Question 4

Which refrigerant has the highest ozone depletion potential (ODP) among those listed?

Accepted Answer

R-12

Answer

R-12 has an ODP of 1.0, the reference value for ozone depletion, making it the most harmful to the ozone layer of these options.

Question 5

What does the term 'critical point' mean for a refrigerant?

Accepted Answer

The temperature and pressure above which liquid and vapor phases are indistinguishable

Answer

The critical point is the temperature and pressure above which a refrigerant exists as a supercritical fluid with no distinct liquid or vapor phase.

EPA 609 - EPA Section 609 Refrigerant Certification Practice Test

EPA 609 - EPA Section 609 Refrigerant Certification Practice Test

EPA 609 Refrigerant Types & Properties 3