EPA 608 questions explained
One question per page: the correct answer, why each wrong choice is wrong, and the source it comes from, quoted word for word.
Core practice test
- Which element in CFC and HCFC refrigerants is responsible for destroying ozone in the stratosphere?
- R-12 belongs to which family of refrigerants?
- Production and import of new R-22 in the United States ended on January 1, 2020. How can existing R-22 systems still be serviced?
- A crew is tearing out an old R-22 rooftop unit for scrap. What does the venting prohibition require of them?
- Does the venting prohibition apply to HFC substitute refrigerants such as R-410A and R-134a?
- Which of these may be released without violating the venting prohibition?
- A technician recovers R-22 into a cylinder and later opens the cylinder valve to empty it outdoors. Is this a violation?
- Recovery and recycling machines made on or after November 15, 1993, must be certified by whom?
- A technician recovers refrigerant to dispose of a 20-pound residential split system. Which record does 40 CFR 82.156(a)(3) require, and for how long?
- A cylinder holding both liquid and vapor R-134a sits in a 75 °F shop. What mainly determines the pressure inside it?
- Which of the three Rs requires analysis to verify the refrigerant meets the specifications based on AHRI Standard 700-2016?
- Why must a recovery cylinder never be filled to more than 80 percent of its capacity?
- Which gas should be used to pressurize a system for leak testing?
- A cylinder of recovered R-22 is being shipped to a reclaimer. What must its labels show?
- A shop services an R-12 freezer, an R-22 rooftop unit and an R-134a chiller. Which statement is true of the refrigerant in all three?
- Which statement about HFO refrigerants such as R-1234yf is correct?
- Which of these refrigerants has the lowest 100-year GWP in EPA's reference table?
- A very wet system keeps forming ice while it is being evacuated. Why might the technician break the vacuum with dry nitrogen?
Type I practice test
- Which of these is a small appliance under 40 CFR 82.152?
- A technician will open the sealed system of a window air conditioner to replace its compressor. Which certification does this work require?
- Who is responsible for making sure refrigerant has been recovered from a household refrigerator before its final disposal?
- To be certified for small appliances, what must new recovery equipment show it can do on the test stand?
- Under 40 CFR 82.154(a), which refrigerant in a household refrigerator is exempt from the venting prohibition?
Type II practice test
- What is the largest full charge on which system-dependent recovery equipment may be used, unless it is a permanently attached pump-out unit?
- Unless granted extra time, how long does an owner have to complete the work in a retrofit or retirement plan for a leaking R-22 appliance of 50 pounds or more?
- Why might a technician add a trace amount of R-22 to the nitrogen used to pressure test a system?
- A cold storage warehouse system holds 600 pounds of R-22 and has exceeded the 20 percent leak rate. How often must it receive leak inspections?
- What usually causes the pressure to rise in an R-22 system that has just been pulled down to its recovery vacuum?
Type III practice test
- How does the required evacuation level for disposing of an R-123 chiller compare with the level for a major repair on the same chiller?
- Why should a technician not go above 10 psig when leak testing an R-123 chiller?
- An 800-pound R-123 chiller cooling an office building has leaked above the 10% rate. Under 40 CFR 82.157(g), how often must leak inspections be done?
- An owner runs a 400-pound R-123 system in a cold-storage warehouse for perishable food. Under 40 CFR Part 82, what leak rate triggers repair?
- After a successful initial verification test on a repaired R-123 chiller that was not evacuated, how soon must the follow-up verification test be done?
- Why is vapor charged before liquid into an evacuated R-123 chiller?
Unofficial, not affiliated with the EPA or any EPA-approved certifying organization. Questions are original practice written from public EPA material, not real exam questions.