EPA 608 Universal Mock Exam | Full-Length Practice
Test with Verified Answers & Step-by-Step
Rationales – Latest Update 2026/2027
QUESTION 1
In which layer of Earth's atmosphere is the protective ozone layer
primarily concentrated?
A. Troposphere
B. Stratosphere
C. Mesosphere
D. Thermosphere
Correct Answer: B. Stratosphere
Detailed Rationale: The highest concentration of ozone molecules
resides in the stratosphere, where they absorb harmful ultraviolet (UV)
radiation from the sun.
QUESTION 2
What international environmental agreement originally set the global
timetable for phasing out ozone-depleting substances (ODS)?
A. The Kyoto Protocol
B. The Montreal Protocol
C. The Paris Agreement
D. The Geneva Convention
,Correct Answer: B. The Montreal Protocol
Detailed Rationale: The Montreal Protocol is the landmark
international treaty designed to protect the ozone layer by phasing out
the production and consumption of ozone-depleting substances like
CFCs and HCFCs.
QUESTION 3
Which compound is used as the baseline reference gas with an assigned
Ozone Depletion Potential (ODP) of 1.0?
A. Carbon dioxide
B. R-22
C. CFC-11
D. R-134a
Correct Answer: C. CFC-11
Detailed Rationale: CFC-11 is the reference standard against which the
ozone-depleting potential of all other chlorine- or bromine-containing
chemicals is measured.
QUESTION 4
What greenhouse gas serves as the baseline reference for assigning
Global Warming Potential (GWP) values with a rating of 1?
A. Methane
B. Carbon dioxide (𝐶𝑂2 )
C. Nitrous oxide
D. R-410A
,Correct Answer: B. Carbon dioxide (𝐶𝑂2 )
Detailed Rationale: Carbon dioxide (𝐶𝑂2 ) is assigned a GWP of 1 over a
100-year time horizon, serving as the benchmark for comparing the
climate impact of other gases.
QUESTION 5
Under Section 608 of the Clean Air Act, what action is strictly prohibited
during the maintenance, service, repair, or disposal of air conditioning
and refrigeration equipment?
A. Using electronic leak detectors
B. The intentional venting of ozone-depleting substances and their
substitutes
C. Operating recovery machines outdoors
D. Reclaiming refrigerant to ARI-700 standards
Correct Answer: B. The intentional venting of ozone-depleting
substances and their substitutes
Detailed Rationale: Federal law prohibits the knowing or intentional
venting or release of regulated refrigerants (including CFCs, HCFCs,
HFCs, and most substitutes) into the atmosphere.
QUESTION 6
What documentation must a refrigerant wholesaler obtain before
selling regulated refrigerants in containers larger than micro-cans?
A. A building construction permit
B. Proof that the purchaser or their employer holds a valid EPA Section
608 technician certification
, C. A personal driver's license
D. A local tax identification number
Correct Answer: B. Proof that the purchaser or their employer holds a
valid EPA Section 608 technician certification
Detailed Rationale: To prevent illegal sales and mishandling, federal
regulations require refrigerant distributors to verify that buyers are
certified technicians or employ certified personnel.
QUESTION 7
Before recovered refrigerant can be legally resold or transferred to
equipment owned by a different person, what standard must it meet?
A. ARI-700 purity standards through an EPA-certified reclaimer
B. Filtering through a basic paper funnel
C. Mixing with fresh compressor oil
D. Storing in an unsealed container for 24 hours
Correct Answer: A. ARI-700 purity standards through an EPA-certified
reclaimer
Detailed Rationale: Reused refrigerant can only be charged directly into
equipment owned by the same customer; otherwise, it must be
processed by a certified reclaimer to meet strict ARI-700 purity
specifications before resale.
QUESTION 8
How does the EPA define a "de minimis" release of refrigerant?
A. A catastrophic tank rupture
Test with Verified Answers & Step-by-Step
Rationales – Latest Update 2026/2027
QUESTION 1
In which layer of Earth's atmosphere is the protective ozone layer
primarily concentrated?
A. Troposphere
B. Stratosphere
C. Mesosphere
D. Thermosphere
Correct Answer: B. Stratosphere
Detailed Rationale: The highest concentration of ozone molecules
resides in the stratosphere, where they absorb harmful ultraviolet (UV)
radiation from the sun.
QUESTION 2
What international environmental agreement originally set the global
timetable for phasing out ozone-depleting substances (ODS)?
A. The Kyoto Protocol
B. The Montreal Protocol
C. The Paris Agreement
D. The Geneva Convention
,Correct Answer: B. The Montreal Protocol
Detailed Rationale: The Montreal Protocol is the landmark
international treaty designed to protect the ozone layer by phasing out
the production and consumption of ozone-depleting substances like
CFCs and HCFCs.
QUESTION 3
Which compound is used as the baseline reference gas with an assigned
Ozone Depletion Potential (ODP) of 1.0?
A. Carbon dioxide
B. R-22
C. CFC-11
D. R-134a
Correct Answer: C. CFC-11
Detailed Rationale: CFC-11 is the reference standard against which the
ozone-depleting potential of all other chlorine- or bromine-containing
chemicals is measured.
QUESTION 4
What greenhouse gas serves as the baseline reference for assigning
Global Warming Potential (GWP) values with a rating of 1?
A. Methane
B. Carbon dioxide (𝐶𝑂2 )
C. Nitrous oxide
D. R-410A
,Correct Answer: B. Carbon dioxide (𝐶𝑂2 )
Detailed Rationale: Carbon dioxide (𝐶𝑂2 ) is assigned a GWP of 1 over a
100-year time horizon, serving as the benchmark for comparing the
climate impact of other gases.
QUESTION 5
Under Section 608 of the Clean Air Act, what action is strictly prohibited
during the maintenance, service, repair, or disposal of air conditioning
and refrigeration equipment?
A. Using electronic leak detectors
B. The intentional venting of ozone-depleting substances and their
substitutes
C. Operating recovery machines outdoors
D. Reclaiming refrigerant to ARI-700 standards
Correct Answer: B. The intentional venting of ozone-depleting
substances and their substitutes
Detailed Rationale: Federal law prohibits the knowing or intentional
venting or release of regulated refrigerants (including CFCs, HCFCs,
HFCs, and most substitutes) into the atmosphere.
QUESTION 6
What documentation must a refrigerant wholesaler obtain before
selling regulated refrigerants in containers larger than micro-cans?
A. A building construction permit
B. Proof that the purchaser or their employer holds a valid EPA Section
608 technician certification
, C. A personal driver's license
D. A local tax identification number
Correct Answer: B. Proof that the purchaser or their employer holds a
valid EPA Section 608 technician certification
Detailed Rationale: To prevent illegal sales and mishandling, federal
regulations require refrigerant distributors to verify that buyers are
certified technicians or employ certified personnel.
QUESTION 7
Before recovered refrigerant can be legally resold or transferred to
equipment owned by a different person, what standard must it meet?
A. ARI-700 purity standards through an EPA-certified reclaimer
B. Filtering through a basic paper funnel
C. Mixing with fresh compressor oil
D. Storing in an unsealed container for 24 hours
Correct Answer: A. ARI-700 purity standards through an EPA-certified
reclaimer
Detailed Rationale: Reused refrigerant can only be charged directly into
equipment owned by the same customer; otherwise, it must be
processed by a certified reclaimer to meet strict ARI-700 purity
specifications before resale.
QUESTION 8
How does the EPA define a "de minimis" release of refrigerant?
A. A catastrophic tank rupture
