EPA 608 Core Practice Test – 10 Questions & Answers
The Core section of the EPA Section 608 technician certification exam tests universal knowledge that every refrigerant handler must master, regardless of the equipment they work on. It covers the Clean Air Act’s venting prohibition, recovery and recycling rules, safety, and proper refrigerant handling practices. Anyone pursuing Type I, II, III, or Universal certification must pass the Core exam.
| Fact | Detail |
|---|---|
| Number of questions | 25 multiple-choice questions |
| Passing score | 70% (18 of 25 correct) |
| Open book? | No – closed-book, proctored exam |
| Certificate validity | Indefinite (does not expire) |
EPA 608 Core Practice Test – 10 Questions
These are original practice questions written for study purposes. They are not real exam questions, leaked questions, or official EPA exam content.
1. Under the Clean Air Act, which of the following is the general rule regarding the venting of refrigerants?
A. Venting is permitted if the refrigerant is recovered within 24 hours
B. Knowingly venting refrigerants into the atmosphere is prohibited
C. Venting small amounts of CFC refrigerants is allowed during repairs
D. Venting is only prohibited for HFC refrigerants
Show answer
Answer: B. Section 608 of the Clean Air Act prohibits knowingly venting ozone-depleting and substitute refrigerants into the atmosphere. This prohibition covers CFCs, HCFCs, and most HFC and HFO substitutes used in comfort cooling and refrigeration equipment.
2. Which federal agency is responsible for administering and enforcing the Section 608 technician certification program?
A. Department of Energy (DOE)
B. Occupational Safety and Health Administration (OSHA)
C. Environmental Protection Agency (EPA)
D. Department of Transportation (DOT)
Show answer
Answer: C. The U.S. Environmental Protection Agency administers Section 608 of the Clean Air Act, which includes setting certification requirements for technicians who work with refrigerants in stationary equipment.
3. Refrigerant cylinders that are being shipped or transported must be:
A. Stored horizontally to prevent leaks
B. Labeled and handled according to DOT regulations
C. Purged of all pressure before transport
D. Stored only in open-air vehicles
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Answer: B. The Department of Transportation regulates the labeling, handling, and transport of refrigerant cylinders because they are considered hazardous materials. Technicians must follow DOT rules when moving cylinders on public roads.
4. Which of the following refrigerant classes has a normal boiling point ABOVE 10°C (50°F)?
A. Very high-pressure refrigerants
B. High-pressure refrigerants
C. Low-pressure refrigerants
D. Medium-pressure refrigerants
Show answer
Answer: C. Low-pressure refrigerants are defined by a normal boiling point above 10°C (50°F); R-11 and R-113 are classic examples. This boiling-point classification determines which Type (I, II, or III) of certification a technician needs.
5. A technician discovers that a refrigerant cylinder has no identifying label. The correct action is to:
A. Use the cylinder immediately before the refrigerant degrades
B. Test the refrigerant with a match to identify it
C. Treat the contents as an unknown mixture and handle accordingly, following safety protocols
D. Mix the unknown contents with a known refrigerant to stretch the supply
Show answer
Answer: C. An unlabeled cylinder must be treated as an unknown and potentially hazardous substance. Mixing unknown refrigerants or using them without identification can create unsafe pressure conditions and contaminate recovery equipment.
6. Which of the following statements about certified refrigerant reclaimers is correct?
A. Any licensed HVAC contractor may reclaim refrigerant on-site without special certification
B. Refrigerant must be reclaimed to AHRI 700 purity standards by an EPA-certified reclaimer
C. Reclaimed refrigerant only needs to meet manufacturer purity standards, not federal standards
D. Refrigerant reclamation is only required for refrigerants above 50 pounds of charge
Show answer
Answer: B. Refrigerant sold as reclaimed must meet AHRI 700 purity standards and must be processed by an EPA-certified reclaim facility. This ensures the refrigerant is safe to reintroduce into equipment without damaging components or releasing contaminants.
7. During refrigerant recovery, a technician must stop recovery and allow the equipment to stand for a period of time, then recheck pressure. This procedure is done primarily to:
A. Allow the compressor oil to settle before restarting
B. Confirm that all refrigerant has migrated out of the oil and been captured
C. Cool the recovery cylinder before adding more refrigerant
D. Satisfy a documentation requirement before opening the system
Show answer
Answer: B. Refrigerant can dissolve into compressor oil and release slowly; allowing the system to stand and rechecking pressure confirms that dissolved refrigerant has migrated out and been recovered, preventing accidental venting when the system is opened.
8. Which of the following correctly describes the term “recycled” refrigerant as used in EPA Section 608 regulations?
A. Refrigerant that has been chemically reprocessed at an off-site facility to AHRI 700 standards
B. Refrigerant that has been cleaned using oil separation and single or multiple passes through filter-driers, typically on-site
C. Refrigerant that has been mixed with virgin stock to improve purity
D. Any refrigerant that has been recovered from equipment, regardless of subsequent treatment
Show answer
Answer: B. Under Section 608, “recycled” refrigerant is refrigerant that has been cleaned on-site using oil separation and filter-driers; it has not been chemically analyzed to AHRI 700 standards. Recycled refrigerant may only be returned to the same owner’s equipment.
9. Which of the following refrigerant safety classifications indicates the HIGHEST flammability risk?
A. Class 1
B. Class 2L
C. Class 2
D. Class 3
Show answer
Answer: D. Under ASHRAE Standard 34, refrigerant flammability is rated from Class 1 (no flame propagation) through Class 2L (lower flammability) and Class 2 to Class 3, which represents the highest flammability risk. Technicians must store and handle Class 3 refrigerants away from ignition sources.
10. Technicians who violate Section 608 regulations—such as knowingly venting refrigerants—may face:
A. Only a written warning for a first offense
B. Civil penalties per day of violation, loss of certification, and potential criminal penalties
C. A mandatory equipment quarantine but no financial penalty
D. Penalties assessed only after a third documented offense
Show answer
Answer: B. The Clean Air Act authorizes the EPA to impose civil penalties for each day a violation continues, to revoke certifications, and to pursue criminal penalties for willful violations. Citizens and companies may also report violations for potential reward through EPA’s enforcement program.
Key facts to memorize
- Venting prohibition: Knowingly venting CFCs, HCFCs, and most refrigerant substitutes into the atmosphere is illegal under Section 608 of the Clean Air Act.
- Recovery vs. recycling vs. reclamation: Recovery = remove refrigerant from a system; Recycling = clean on-site with filter-driers (returned to same owner); Reclamation = process to AHRI 700 purity at a certified facility.
- Boiling-point classifications: Low-pressure = boiling point above 10°C (50°F); High-pressure = between −50°C and 10°C (−58°F to 50°F); Very high-pressure = below −50°C (−58°F).
- Core exam format: 25 closed-book, proctored multiple-choice questions; a score of 70% (18 correct) is required to pass.
- Certification is indefinite: Section 608 technician certificates do not expire, but the technician must have been tested after November 14, 1994 by an EPA-approved certifying organization.
- ASHRAE 34 flammability classes: Class 1 (no flame), Class 2L (mildly flammable), Class 2 (flammable), Class 3 (highly flammable)—know the hierarchy for safety questions.
- DOT governs transport: Refrigerant cylinders on public roads must comply with Department of Transportation labeling and handling regulations, separate from EPA rules.
- Approved refrigerant purity standard: Reclaimed refrigerant must meet AHRI 700 purity standards—not an older ARI standard and not a manufacturer standard.
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Frequently asked questions
Do I have to pass the Core exam even if I only work on small appliances?
Yes. The Core section is mandatory for all Section 608 certification types. Whether you are pursuing Type I (small appliances), Type II (high-pressure), Type III (low-pressure), or Universal certification, you must pass the Core exam in addition to the applicable type-specific section. There is no certification that skips the Core requirement.
Is the Core exam open-book?
No. The Core exam—along with the Type II and Type III sections—must be taken closed-book under the supervision of an EPA-approved proctoring organization. Only the Type I exam may be administered in an open-book, non-proctored format through certain approved programs. Do not confuse these rules when preparing for your test day.
How long does my Section 608 certification remain valid?
Section 608 technician certification does not have an expiration date—it is valid indefinitely, provided the certificate was issued by an EPA-approved certifying organization on or after November 14, 1994. However, if refrigerant regulations change significantly, technicians are responsible for staying current with the rules even though their credential does not lapse.
Where can I find the official EPA rules for Section 608?
The EPA publishes all current Section 608 regulations, technician certification requirements, and lists of approved certifying organizations on its official website. You can review the official guidance directly at EPA Section 608 Refrigerant Management. Always cross-reference study materials against the official source, especially if you hear about recent regulatory updates.