Timed mock · scored by section
Timed EPA 608 practice exam
This EPA 608 practice exam runs against a clock, takes the sections in order, Core first and then Type I, II and III, and keeps every note closed until you submit, so your score by section shows where you'd slip under time pressure.
EPA 608 mock exam, four sections
Before you start
- One question at a time. If one stalls you, flag it and move on: a skipped question costs less than a stuck clock.
- The clock runs from Start and submits for you at zero.
- Notes stay closed until you submit, so the score is honest. Then every option is explained.
How this mock is laid out
| Section | Questions |
|---|---|
| Core | 14 |
| Type I | 13 |
| Type II | 14 |
| Type III | 13 |
| Total | 54 |
When recovering an unidentified refrigerant from a compromised system, what is the correct handling procedure?
Why each option is right or wrong
Answer: A. Use a dedicated empty cylinder
- ACorrect: an unknown refrigerant goes into its own empty, evacuated cylinder so it can't contaminate a tank of a single known refrigerant, which a reclaimer could otherwise process.
- BWrong: dumping an unknown gas into an R-22 tank turns the whole batch into a mixture that usually can't be reclaimed and must be destroyed.
- CWrong: mixing refrigerants is exactly what you must avoid; adding a known HFC just creates a larger contaminated mixture.
- DWrong: a gauge manifold measures pressure and has no filtering ability, and filtering would not identify or separate the refrigerant anyway.
Unidentified refrigerants must be recovered into dedicated, evacuated cylinders to prevent cross-contamination. Mixing ruins the batch, requiring expensive destruction instead of reclamation to industry purity specifications.
According to EPA regulations, what must be done before disposing of appliances containing refrigerant?
Why each option is right or wrong
Answer: B. Recover the refrigerant
- AWrong: you can't swap the charge for nitrogen without first removing the refrigerant, and releasing it to make room would be venting.
- BCorrect: refrigerant has to be recovered before the appliance is disposed of, so none of it escapes to the atmosphere.
- CWrong: Section 608 does not require a disposal permit; what it requires is recovery, plus a signed statement when refrigerant was removed upstream.
- DWrong: refrigerant isn't neutralized on site; it is recovered and then recycled, reclaimed, or sent for destruction.
EPA regulations require that refrigerant must be recovered from appliances before disposal to prevent release into the atmosphere. This applies to all refrigerant-containing equipment.
Which safety practice applies when transferring refrigerant?
Why each option is right or wrong
Answer: B. Never heat cylinders above 125°F
- AWrong: refrigerant goes only into cylinders rated for it, such as DOT-approved recovery cylinders, never into whatever container is handy.
- BCorrect: heating a cylinder above 125°F can raise pressure, and liquid expansion, to the point of rupture, so cylinders are kept below that temperature.
- CWrong: there is no rule to store cylinders on their side; they are normally kept upright and secured.
- DWrong: the pressure relief valve is a key safety device and must never be removed or disabled.
Never heat refrigerant cylinders above 125°F as this can cause dangerous pressure buildup and potential explosion.
What is the purpose of a recovery unit's high-pressure cutoff?
Why each option is right or wrong
Answer: B. To prevent tank overpressurization
- AWrong: the cutoff does not measure charge; you weigh the recovery cylinder on a scale to know how much refrigerant it holds.
- BCorrect: the high-pressure cutoff shuts the recovery unit down before discharge or tank pressure gets dangerously high.
- CWrong: cleaning refrigerant is the job of oil separators and filter-driers (recycling), not a pressure switch.
- DWrong: a safety cutoff stops the unit; it does nothing to make recovery faster.
A recovery unit's high-pressure cutoff prevents tank overpressurization and potential safety hazards during recovery.
What is the minimum record retention period for refrigerant servicing?
Why each option is right or wrong
Answer: A. Three years
- ACorrect: Section 608 records, such as leak-repair, disposal and sales records, are kept for three years.
- BWrong: one year is too short; the recordkeeping period in the 608 rules is three years.
- CWrong: ten years is far longer than any 608 recordkeeping requirement.
- DWrong: five years is not the 608 period; it is a common guess that confuses this with other retention rules.
Service records must be maintained for a minimum of three years to comply with EPA regulations.
What is the primary difference between recovery and recycling of refrigerants?
Why each option is right or wrong
Answer: A. Recycling includes cleaning for reuse while recovery is just removal
- ACorrect: recovery only removes and stores refrigerant, while recycling also cleans it (oil separation, filter-driers) for reuse.
- BWrong: recycling isn't limited to small appliances; it applies to refrigerant reused in the same owner's equipment of any size.
- CWrong: certification rules apply to technicians handling refrigerant, not to recovery but not recycling.
- DWrong: recovery happens during service as well as at disposal, whenever refrigerant has to come out of the system.
Recovery is removing refrigerant from equipment in any condition, while recycling involves cleaning the refrigerant for reuse through oil separation and filtering.
What type of certification is required for purchasing CFC and HCFC refrigerants?
Why each option is right or wrong
Answer: A. EPA Section 608 certification
- ACorrect: CFC and HCFC refrigerants may be sold only to technicians certified under Section 608 (or Section 609 for motor vehicle work).
- BWrong: a driver's license proves identity, not training in refrigerant handling.
- CWrong: a state or local HVAC license is not the federal certification the sales restriction requires.
- DWrong: a business permit doesn't show that the buyer is a certified technician.
EPA Section 608 certification is required for purchasing CFC and HCFC refrigerants to ensure proper handling.
What action is required for contaminated refrigerant?
Why each option is right or wrong
Answer: B. Send to EPA-certified reclaimer
- AWrong: mixing contaminated refrigerant with new refrigerant spoils the new refrigerant and doesn't fix the contamination.
- BCorrect: contaminated refrigerant that can't be reused goes to an EPA-certified reclaimer, who reprocesses it to AHRI 700 purity or arranges destruction.
- CWrong: putting contaminated refrigerant back into a system can damage the compressor and spread the contamination.
- DWrong: releasing refrigerant to the atmosphere is knowing venting, which is prohibited.
Contaminated refrigerant must be sent to an EPA-certified reclaimer for proper processing or disposal.
What condition makes a recovery cylinder unsafe for use?
Why each option is right or wrong
Answer: A. Expired hydrostatic test date
- ACorrect: a recovery cylinder past its hydrostatic retest date isn't certified to hold pressure and must not be filled until it is retested.
- BWrong: discolored paint is cosmetic; it doesn't affect the cylinder's pressure rating.
- CWrong: minor surface scratches don't weaken a cylinder; deep dents, gouges, or corrosion are what matter.
- DWrong: a faded label should be replaced so the contents are identified, but it doesn't make the shell unsafe to hold pressure.
An expired hydrostatic test date makes a recovery cylinder unsafe as it may not safely contain pressurized refrigerant.
What is the primary environmental concern with CFC refrigerants?
Why each option is right or wrong
Answer: C. Ozone layer depletion
- AWrong: general air quality, such as smog, is not the main issue with CFCs; their chlorine damages stratospheric ozone.
- BWrong: CFCs are gases released to the air, so soil contamination is not their main environmental concern.
- CCorrect: chlorine in CFCs destroys stratospheric ozone, which lets more harmful UV radiation reach the ground.
- DWrong: water pollution is not the concern; CFCs do their damage high in the atmosphere.
CFC refrigerants deplete the ozone layer when released into the atmosphere, reducing protection from harmful UV radiation.
This mock beside a real sitting
Real EPA 608 test compared with this mock
| Item | Real test | This mock |
|---|---|---|
| Sections | Core plus one type for Type I, II or III; all four for Universal | All four, in order, Core first |
| Length | A 50-question type test or a 100-question Universal test (40 CFR 82, Appendix D (a)) | Shorter than Universal; the layout above the Start button shows each section |
| Time | Set by the program: SkillCat lists 2 hours for Universal and 1 hour per type test (SkillCat FAQ) | A fixed pace per question, set by this site |
| Book rules | Closed-book and proctored for Type II, Type III and Universal | Open notes, if you insist. The score only means something without them. |
| Feedback | Results within 30 days under the rule (40 CFR 82, Appendix D (e)); ESCO's online exam reports the same day (ESCO 2026 exam page) | Every option explained the moment you submit |
Yellow edge: the two columns say different things on this row.
Rules: eCFR as of October 5, 2026. Program pages: checked October 7, 2026.
Reading your section scores
Universal needs Core and all three types, and the rule's pass mark is 70% (40 CFR 82, Appendix D (e), eCFR as of October 5, 2026). A section that comes back under that line here is where you'll start, and the drill on each topic page in the EPA 608 study guide is the place to do it.
A weak section costs less on test day than it looks. With ESCO Institute, for one, a failed section is retaken on its own and passed sections stay passed (ESCO 2026 exam page, checked October 7, 2026). So a low score here calls for one section of drills, then another timed run once the untimed practice test stops surprising you.
Before you book the real one
How long is the real EPA 608 test?
EPA's rule sets no time limit; your certifying program does. SkillCat, for example, lists 2 hours for Universal and 1 hour for each type test (SkillCat FAQ, checked October 7, 2026). Check your own program before test day.
Does a good mock score mean I'll pass?
It shows which section is weakest under time pressure, and that's all it shows. The real test is drawn from EPA's bank in versions you won't have seen, so treat a section that barely clears 70% here as unfinished.
Can I take the real exam online?
Yes, with some programs. EPA's list marks the ones offering remote or online-only testing (EPA list of certification programs, checked October 7, 2026), and EPA 608 testing online walks through how a remote sitting works.