EPA EPA Refrigerant Types and Properties 2

Question 1

What is the primary environmental concern with CFC refrigerants such as R-11 and R-12?

Accepted Answer

Ozone layer depletion

Answer

CFC refrigerants release chlorine atoms when broken down by UV radiation in the stratosphere, which catalytically destroy ozone molecules.

Question 2

Which refrigerant has an ASHRAE safety classification of A2L, indicating it is mildly flammable?

Accepted Answer

R-32

Answer

R-32 is classified as A2L because it is mildly flammable with a low burning velocity, requiring specific handling precautions compared to non-flammable refrigerants.

Question 3

What is the critical temperature of a refrigerant?

Accepted Answer

The temperature above which the refrigerant cannot be liquefied regardless of pressure

Answer

The critical temperature is the point above which a substance cannot exist in liquid form no matter how much pressure is applied.

Question 4

How are refrigerant blends with a temperature glide best charged into a system?

Accepted Answer

As a liquid from the cylinder

Answer

Zeotropic refrigerant blends with temperature glide should be charged as a liquid to maintain the correct mixture ratios and prevent fractionation.

Question 5

Which refrigerant was commonly used in automotive air conditioning before being phased out due to ozone depletion concerns?

Accepted Answer

R-12

Answer

R-12 (dichlorodifluoromethane) was the standard automotive AC refrigerant until it was phased out under the Clean Air Act due to its high ODP.

EPA - Environmental Protection Agency Universal Certification Practice Test

EPA - Environmental Protection Agency Universal Certification Practice Test

EPA EPA Refrigerant Types and Properties 2