EPA Section 608 Universal Certification
Exam Practice Questions And Correct
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Rationales 2026 Q&A Instant Download
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1. Which of the following is considered an ozone-depleting substance?
A. Water vapor
B. CFC-12
C. Nitrogen
D. Oxygen
Rationale: CFC-12 is a chlorofluorocarbon, which releases chlorine atoms
in the stratosphere, leading to ozone depletion.
2. What is the main purpose of a recovery cylinder when servicing an
appliance?
A. To store refrigerant temporarily during repair
B. To increase system pressure
C. To safely hold refrigerant removed from a system
D. To reduce leaks
Rationale: Recovery cylinders are designed to safely contain refrigerant
removed from appliances for later reuse or disposal.
3. Which device prevents excessive pressure in a refrigeration system?
A. Expansion valve
, B. Relief valve
C. Compressor
D. Receiver
Rationale: Relief valves protect the system by releasing refrigerant if the
pressure exceeds safe limits.
4. When is it acceptable to vent CFC or HCFC refrigerants to the atmosphere?
A. During installation
B. Never
C. During maintenance
D. Only if the system is old
Rationale: EPA regulations prohibit venting ozone-depleting refrigerants
to prevent environmental damage.
5. What color coding is standard for a recovery cylinder containing R-22
refrigerant?
A. Blue
B. Light green
C. Yellow
D. Gray
Rationale: Light green cylinders are designated for R-22, while other
refrigerants have their own color codes.
6. What does the term "subcooling" refer to in refrigeration?
A. Refrigerant in a gaseous state
B. Liquid refrigerant cooled below its condensing temperature
C. Refrigerant entering the compressor
D. Refrigerant vaporizing in the evaporator
Rationale: Subcooling increases efficiency and ensures liquid refrigerant
reaches the expansion device.
7. What is the function of a drier in a refrigeration system?
A. Increase pressure
B. Remove moisture and contaminants from refrigerant
C. Reduce superheat
, D. Compress refrigerant
Rationale: Driers prevent moisture and particulate from damaging
components or freezing in the system.
8. Which refrigerant has zero Ozone Depletion Potential (ODP)?
A. R-12
B. R-22
C. R-410A
D. R-502
Rationale: R-410A is a hydrofluorocarbon (HFC) with no chlorine, therefore
zero ODP.
9. What is considered the maximum safe level of refrigerant leakage for
systems under EPA regulations?
A. 5% annually
B. 10% annually
C. 20% annually
D. Depends on system size and type
Rationale: EPA leak repair requirements vary depending on the appliance
type and refrigerant charge.
10.Which of the following actions is required if a certified technician discovers
a leak?
A. Ignore it
B. Replace the system immediately
C. Repair the leak and document it
D. Reduce system operation
Rationale: EPA Section 608 requires technicians to repair leaks promptly
and maintain records.
11.When using a manifold gauge set, which side is the low-pressure gauge
connected to?
A. Discharge line
B. Suction line
C. Condenser outlet
Exam Practice Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A Instant Download
1. Which of the following is considered an ozone-depleting substance?
A. Water vapor
B. CFC-12
C. Nitrogen
D. Oxygen
Rationale: CFC-12 is a chlorofluorocarbon, which releases chlorine atoms
in the stratosphere, leading to ozone depletion.
2. What is the main purpose of a recovery cylinder when servicing an
appliance?
A. To store refrigerant temporarily during repair
B. To increase system pressure
C. To safely hold refrigerant removed from a system
D. To reduce leaks
Rationale: Recovery cylinders are designed to safely contain refrigerant
removed from appliances for later reuse or disposal.
3. Which device prevents excessive pressure in a refrigeration system?
A. Expansion valve
, B. Relief valve
C. Compressor
D. Receiver
Rationale: Relief valves protect the system by releasing refrigerant if the
pressure exceeds safe limits.
4. When is it acceptable to vent CFC or HCFC refrigerants to the atmosphere?
A. During installation
B. Never
C. During maintenance
D. Only if the system is old
Rationale: EPA regulations prohibit venting ozone-depleting refrigerants
to prevent environmental damage.
5. What color coding is standard for a recovery cylinder containing R-22
refrigerant?
A. Blue
B. Light green
C. Yellow
D. Gray
Rationale: Light green cylinders are designated for R-22, while other
refrigerants have their own color codes.
6. What does the term "subcooling" refer to in refrigeration?
A. Refrigerant in a gaseous state
B. Liquid refrigerant cooled below its condensing temperature
C. Refrigerant entering the compressor
D. Refrigerant vaporizing in the evaporator
Rationale: Subcooling increases efficiency and ensures liquid refrigerant
reaches the expansion device.
7. What is the function of a drier in a refrigeration system?
A. Increase pressure
B. Remove moisture and contaminants from refrigerant
C. Reduce superheat
, D. Compress refrigerant
Rationale: Driers prevent moisture and particulate from damaging
components or freezing in the system.
8. Which refrigerant has zero Ozone Depletion Potential (ODP)?
A. R-12
B. R-22
C. R-410A
D. R-502
Rationale: R-410A is a hydrofluorocarbon (HFC) with no chlorine, therefore
zero ODP.
9. What is considered the maximum safe level of refrigerant leakage for
systems under EPA regulations?
A. 5% annually
B. 10% annually
C. 20% annually
D. Depends on system size and type
Rationale: EPA leak repair requirements vary depending on the appliance
type and refrigerant charge.
10.Which of the following actions is required if a certified technician discovers
a leak?
A. Ignore it
B. Replace the system immediately
C. Repair the leak and document it
D. Reduce system operation
Rationale: EPA Section 608 requires technicians to repair leaks promptly
and maintain records.
11.When using a manifold gauge set, which side is the low-pressure gauge
connected to?
A. Discharge line
B. Suction line
C. Condenser outlet
