SkillCat EPA 608 Exam Test Bank Actual Exam
2026/2027 | Complete Exam-Style Questions with Detailed
Rationales | 100% Verified | Pass Guaranteed – A+
Graded
**Refrigerant Fundamentals and Environmental Impact**
Q1: Which of the following refrigerant classifications contains no chlorine and therefore has
an ozone depletion potential (ODP) of zero?
A. CFCs
B. HCFCs
C. HFCs [CORRECT]
D. Halons
Correct Answer: C
Rationale: The best answer is HFCs. This choice is correct because hydrofluorocarbons do
not contain chlorine, which is the primary chemical responsible for stratospheric ozone
depletion.
Q2: What is the primary purpose of the Montreal Protocol?
A. To regulate the safety of refrigerant recovery equipment.
B. To phase out the production and consumption of ozone-depleting substances globally.
[CORRECT]
C. To establish the maximum allowable leak rates for commercial refrigeration.
D. To mandate the recycling of all HVACR components.
Correct Answer: B
Rationale: This choice is correct because the Montreal Protocol is the landmark international
treaty designed specifically to protect the ozone layer by phasing out ozone-depleting
chemicals. This aligns with the foundational history of environmental HVACR regulations.
Q3: A customer asks why their old R-22 air conditioner is so expensive to repair. How should
you explain the environmental impact of R-22?
A. R-22 is highly flammable and poses an immediate fire risk to their home.
B. R-22 is an HCFC that contributes to ozone depletion, leading to strict phase-outs and
limited supply. [CORRECT]
C. R-22 has a zero global warming potential, making it illegal to use in new systems.
D. R-22 is an HFO that the EPA requires to be replaced every five years.
Correct Answer: B
Rationale: The best answer is explaining that R-22 is an HCFC contributing to ozone
depletion. This matches the principle that technicians must accurately communicate the
regulatory and environmental reasons behind refrigerant phase-outs to customers.
,Q4: Which element in CFC and HCFC refrigerants is primarily responsible for breaking down
ozone molecules in the stratosphere?
A. Fluorine
B. Carbon
C. Hydrogen
D. Chlorine [CORRECT]
Correct Answer: D
Rationale: This choice is correct because chlorine atoms are released when CFCs and HCFCs
are exposed to UV radiation, and these atoms catalytically destroy ozone molecules. This
aligns with the core chemistry of ozone depletion.
Q5: When comparing two refrigerants, Refrigerant A has a GWP of 1,400 and Refrigerant B
has a GWP of 4. Which statement is most accurate?
A. Refrigerant A is an HFO, and Refrigerant B is an HFC.
B. Refrigerant B has a significantly lower impact on global warming than Refrigerant A.
[CORRECT]
C. Refrigerant A is safer to vent than Refrigerant B.
D. Refrigerant B has a higher ozone depletion potential than Refrigerant A.
Correct Answer: B
Rationale: The best answer is that Refrigerant B has a significantly lower global warming
impact. This aligns with the principle that Global Warming Potential (GWP) is a relative
measure of how much heat a greenhouse gas traps in the atmosphere compared to CO2.
Q6: What is the ozone depletion potential (ODP) of R-410A?
A. 0.05
B. 0.0
C. 0.0 [CORRECT]
D. 1.0
Correct Answer: B
Rationale: This choice is correct because R-410A is an HFC blend and contains no chlorine,
giving it an ODP of exactly zero. This matches the fundamental classification of HFC
refrigerants.
Q7: Which of the following refrigerants is classified as an HFO and is commonly used as a
lower-GWP alternative in newer automotive and commercial systems?
A. R-134a
B. R-22
C. R-1234yf [CORRECT]
D. R-404A
Correct Answer: C
Rationale: The best answer is R-1234yf. This aligns with industry trends where
hydrofluoroolefins (HFOs) are adopted for their ultra-low global warming potential while
maintaining non-ozone-depleting properties.
Q8: Under the Clean Air Act, what is the EPA’s stance on the intentional venting of HFC
refrigerants?
A. It is permitted if the system is older than 10 years.
, B. It is prohibited, as HFCs are potent greenhouse gases. [CORRECT]
C. It is allowed as long as the refrigerant is recovered within 24 hours.
D. It is only prohibited for CFCs and HCFCs, not HFCs.
Correct Answer: B
Rationale: This choice is correct because the EPA expanded the venting prohibition to
include HFCs and their substitutes due to their high global warming potential. This matches
the principle that no ozone-depleting or high-GWP refrigerant should be intentionally
released.
Q9: Analysis: A technician claims that because a refrigerant is "ozone-friendly," it is perfectly
legal to vent it into the atmosphere. Evaluate this claim.
A. The claim is correct; ozone-friendly refrigerants have no environmental restrictions.
B. The claim is incorrect because "ozone-friendly" refrigerants like HFCs still have high global
warming potential and are subject to venting prohibitions. [CORRECT]
C. The claim is partially correct, but only for small appliances under 15 lbs.
D. The claim is incorrect because all refrigerants, regardless of type, deplete the ozone layer.
Correct Answer: B
Rationale: The best answer is that the claim is incorrect due to the global warming potential
of HFCs. This matches the principle that environmental compliance requires evaluating both
ODP and GWP, not just ozone depletion.
Q10: You are removing an old window air conditioner that uses R-12. What is the
environmentally responsible and legally required action before disposing of the unit?
A. Drill a hole in the compressor to let the refrigerant escape safely.
B. Recover the refrigerant using certified equipment before the unit is scrapped. [CORRECT]
C. Seal the lines with tape and send it to the landfill as-is.
D. Run the unit until it is completely out of refrigerant, then dispose of it.
Correct Answer: B
Rationale: This choice is correct because EPA regulations mandate the recovery of
refrigerant from all appliances before disposal. This aligns with the principle that preventing
atmospheric release is required regardless of the appliance size or age.
Q11: Which of the following best describes the chemical makeup of an HCFC refrigerant?
A. Hydrogen, Chlorine, Fluorine, and Carbon [CORRECT]
B. Hydrogen, Fluorine, and Carbon only
C. Chlorine, Fluorine, and Carbon only
D. Hydrogen, Oxygen, Fluorine, and Carbon
Correct Answer: A
Rationale: The best answer is Hydrogen, Chlorine, Fluorine, and Carbon. This matches the
definitional breakdown of Hydrochlorofluorocarbons, where the presence of hydrogen
makes them less stable in the lower atmosphere, reducing but not eliminating their ODP.
Q12: A homeowner asks if they can just "top off" their R-410A system every year instead of
fixing the leak. What is the most appropriate response?
A. Yes, as long as you use the correct refrigerant, it is harmless.
B. No, because venting is illegal, and a system that needs annual topping off has a significant
leak that must be repaired. [CORRECT]
2026/2027 | Complete Exam-Style Questions with Detailed
Rationales | 100% Verified | Pass Guaranteed – A+
Graded
**Refrigerant Fundamentals and Environmental Impact**
Q1: Which of the following refrigerant classifications contains no chlorine and therefore has
an ozone depletion potential (ODP) of zero?
A. CFCs
B. HCFCs
C. HFCs [CORRECT]
D. Halons
Correct Answer: C
Rationale: The best answer is HFCs. This choice is correct because hydrofluorocarbons do
not contain chlorine, which is the primary chemical responsible for stratospheric ozone
depletion.
Q2: What is the primary purpose of the Montreal Protocol?
A. To regulate the safety of refrigerant recovery equipment.
B. To phase out the production and consumption of ozone-depleting substances globally.
[CORRECT]
C. To establish the maximum allowable leak rates for commercial refrigeration.
D. To mandate the recycling of all HVACR components.
Correct Answer: B
Rationale: This choice is correct because the Montreal Protocol is the landmark international
treaty designed specifically to protect the ozone layer by phasing out ozone-depleting
chemicals. This aligns with the foundational history of environmental HVACR regulations.
Q3: A customer asks why their old R-22 air conditioner is so expensive to repair. How should
you explain the environmental impact of R-22?
A. R-22 is highly flammable and poses an immediate fire risk to their home.
B. R-22 is an HCFC that contributes to ozone depletion, leading to strict phase-outs and
limited supply. [CORRECT]
C. R-22 has a zero global warming potential, making it illegal to use in new systems.
D. R-22 is an HFO that the EPA requires to be replaced every five years.
Correct Answer: B
Rationale: The best answer is explaining that R-22 is an HCFC contributing to ozone
depletion. This matches the principle that technicians must accurately communicate the
regulatory and environmental reasons behind refrigerant phase-outs to customers.
,Q4: Which element in CFC and HCFC refrigerants is primarily responsible for breaking down
ozone molecules in the stratosphere?
A. Fluorine
B. Carbon
C. Hydrogen
D. Chlorine [CORRECT]
Correct Answer: D
Rationale: This choice is correct because chlorine atoms are released when CFCs and HCFCs
are exposed to UV radiation, and these atoms catalytically destroy ozone molecules. This
aligns with the core chemistry of ozone depletion.
Q5: When comparing two refrigerants, Refrigerant A has a GWP of 1,400 and Refrigerant B
has a GWP of 4. Which statement is most accurate?
A. Refrigerant A is an HFO, and Refrigerant B is an HFC.
B. Refrigerant B has a significantly lower impact on global warming than Refrigerant A.
[CORRECT]
C. Refrigerant A is safer to vent than Refrigerant B.
D. Refrigerant B has a higher ozone depletion potential than Refrigerant A.
Correct Answer: B
Rationale: The best answer is that Refrigerant B has a significantly lower global warming
impact. This aligns with the principle that Global Warming Potential (GWP) is a relative
measure of how much heat a greenhouse gas traps in the atmosphere compared to CO2.
Q6: What is the ozone depletion potential (ODP) of R-410A?
A. 0.05
B. 0.0
C. 0.0 [CORRECT]
D. 1.0
Correct Answer: B
Rationale: This choice is correct because R-410A is an HFC blend and contains no chlorine,
giving it an ODP of exactly zero. This matches the fundamental classification of HFC
refrigerants.
Q7: Which of the following refrigerants is classified as an HFO and is commonly used as a
lower-GWP alternative in newer automotive and commercial systems?
A. R-134a
B. R-22
C. R-1234yf [CORRECT]
D. R-404A
Correct Answer: C
Rationale: The best answer is R-1234yf. This aligns with industry trends where
hydrofluoroolefins (HFOs) are adopted for their ultra-low global warming potential while
maintaining non-ozone-depleting properties.
Q8: Under the Clean Air Act, what is the EPA’s stance on the intentional venting of HFC
refrigerants?
A. It is permitted if the system is older than 10 years.
, B. It is prohibited, as HFCs are potent greenhouse gases. [CORRECT]
C. It is allowed as long as the refrigerant is recovered within 24 hours.
D. It is only prohibited for CFCs and HCFCs, not HFCs.
Correct Answer: B
Rationale: This choice is correct because the EPA expanded the venting prohibition to
include HFCs and their substitutes due to their high global warming potential. This matches
the principle that no ozone-depleting or high-GWP refrigerant should be intentionally
released.
Q9: Analysis: A technician claims that because a refrigerant is "ozone-friendly," it is perfectly
legal to vent it into the atmosphere. Evaluate this claim.
A. The claim is correct; ozone-friendly refrigerants have no environmental restrictions.
B. The claim is incorrect because "ozone-friendly" refrigerants like HFCs still have high global
warming potential and are subject to venting prohibitions. [CORRECT]
C. The claim is partially correct, but only for small appliances under 15 lbs.
D. The claim is incorrect because all refrigerants, regardless of type, deplete the ozone layer.
Correct Answer: B
Rationale: The best answer is that the claim is incorrect due to the global warming potential
of HFCs. This matches the principle that environmental compliance requires evaluating both
ODP and GWP, not just ozone depletion.
Q10: You are removing an old window air conditioner that uses R-12. What is the
environmentally responsible and legally required action before disposing of the unit?
A. Drill a hole in the compressor to let the refrigerant escape safely.
B. Recover the refrigerant using certified equipment before the unit is scrapped. [CORRECT]
C. Seal the lines with tape and send it to the landfill as-is.
D. Run the unit until it is completely out of refrigerant, then dispose of it.
Correct Answer: B
Rationale: This choice is correct because EPA regulations mandate the recovery of
refrigerant from all appliances before disposal. This aligns with the principle that preventing
atmospheric release is required regardless of the appliance size or age.
Q11: Which of the following best describes the chemical makeup of an HCFC refrigerant?
A. Hydrogen, Chlorine, Fluorine, and Carbon [CORRECT]
B. Hydrogen, Fluorine, and Carbon only
C. Chlorine, Fluorine, and Carbon only
D. Hydrogen, Oxygen, Fluorine, and Carbon
Correct Answer: A
Rationale: The best answer is Hydrogen, Chlorine, Fluorine, and Carbon. This matches the
definitional breakdown of Hydrochlorofluorocarbons, where the presence of hydrogen
makes them less stable in the lower atmosphere, reducing but not eliminating their ODP.
Q12: A homeowner asks if they can just "top off" their R-410A system every year instead of
fixing the leak. What is the most appropriate response?
A. Yes, as long as you use the correct refrigerant, it is harmless.
B. No, because venting is illegal, and a system that needs annual topping off has a significant
leak that must be repaired. [CORRECT]
