CFC Alternative Refrigerants & Transitions 4

Question 1

Which of the following refrigerants has the highest Ozone Depletion Potential (ODP)?

Accepted Answer

R-11

Answer

R-11 (CFC-11) has an ODP of 1.0, which is the reference value against which all other refrigerants are measured, making it the highest among common refrigerants.

Question 2

A technician retrofitting an R-22 system with R-422D must use which type of lubricant?

Accepted Answer

Alkylbenzene oil or mineral oil

Answer

R-422D is compatible with existing mineral oil or alkylbenzene oil in R-22 systems, making it a popular retrofit refrigerant because oil change is not required.

Question 3

What is the primary environmental advantage of natural refrigerants such as CO₂ (R-744) and ammonia (R-717)?

Accepted Answer

They have zero or near-zero GWP and zero ODP

Answer

Natural refrigerants like CO₂ and ammonia have zero ODP and GWPs of 1 (CO₂) or 0 (ammonia), making them environmentally superior long-term alternatives.

Question 4

Why must technicians use dedicated recovery equipment when handling A2L refrigerants like R-32 or R-454B?

Accepted Answer

Standard recovery equipment may contain ignition sources that could ignite mildly flammable refrigerants

Answer

A2L refrigerants are mildly flammable, and standard recovery equipment may contain electrical sparks or hot surfaces that could act as ignition sources.

Question 5

R-507A is primarily used as a replacement for which high-GWP refrigerant in commercial refrigeration?

Accepted Answer

R-502

Answer

R-507A was developed as an azeotropic HFC blend to replace R-502 in medium and low-temperature commercial refrigeration applications.

(CFC) Chlorofluorocarbon Certification Practice Test

(CFC) Chlorofluorocarbon Certification Practice Test

CFC Alternative Refrigerants & Transitions 4