Sample questions with explained answers

The questions below cover all four exam sections: Core, Type I, Type II, and Type III. Each answer explains the correct choice and why the common wrong answers fail.

Sample question 1 (Core)

Under Section 608 of the Clean Air Act, when was the venting prohibition extended to cover HFCs?
A) July 1, 1992    B) November 15, 1993    C) November 15, 1995    D) January 1, 2000

Correct answer: C, November 15, 1995

The July 1, 1992 date covers CFCs and HCFCs, not HFCs. The November 15, 1993 date applies to recovery equipment manufacture standards, also not HFC venting. HFCs were added to the venting prohibition on November 15, 1995. Technicians who memorize only one date consistently select A (1992) here.

Sample question 2 (Core)

A technician removes refrigerant from a system and stores it in a recovery cylinder without further processing. This is called:
A) Reclamation    B) Recycling    C) Recovery    D) Reprocessing

Correct answer: C, Recovery

Recovery is removing refrigerant and storing it without processing. Recycling adds oil separation and filter drier passes. Reclamation reprocesses to ARI-700 purity at an EPA certified facility. The trap: recycling sounds more positive and gets chosen by technicians who confuse it with everyday recycling.

Sample question 3 (Type I)

A technician uses a small appliance's own compressor to draw refrigerant into a recovery cylinder. This is called:
A) Self contained recovery    B) System dependent recovery    C) Active recovery    D) Passive recovery

Correct answer: B, system dependent recovery

System dependent recovery uses the appliance's compressor. Self contained recovery uses a separate machine with its own compressor. The trap: self contained sounds like it describes the technician working alone, but it refers to the recovery machine having its own contained compressor.

Sample question 4 (Type II)

A comfort cooling system with 75 lbs of R-410A is found to have lost 8 lbs in the past year. Is mandatory leak repair required?
A) Yes, 8 lbs exceeds the 10 percent threshold    B) No, 8 lbs is less than the 10 percent threshold (7.5 lbs)    C) Yes, all leaks over 1 lb require mandatory repair    D) No, only commercial refrigeration systems have mandatory leak repair requirements

Correct answer: A, mandatory repair is required

10 percent of 75 lbs is 7.5 lbs. The system lost 8 lbs, exceeding the 10 percent comfort cooling threshold, so repair is required. The trap: technicians calculate incorrectly or confuse 10 percent with 20 percent, the commercial refrigeration threshold.

Sample question 5 (Type III)

Why should a technician never use refrigerant vapor to pressurize a low pressure chiller for leak testing?
A) Refrigerant vapor is too expensive to waste    B) The high pressure would damage the chiller compressor    C) Pressurizing with refrigerant would push refrigerant out through leaks, which is venting prohibited under Section 608    D) Low pressure chillers cannot withstand any positive pressure

Correct answer: C

Low pressure systems operate in a vacuum, so pressurizing with refrigerant creates positive pressure that forces refrigerant out through leaks. That is intentional venting, prohibited under Section 608. Dry nitrogen at 0 psig is the approved alternative. The trap: option D sounds plausible, but low pressure chillers can withstand some positive pressure; the prohibition is regulatory, not a hardware limit.

Wrong answer logic: why technicians miss these questions

The EPA 608 exam uses specific distractor patterns that mislead unprepared technicians. Knowing these patterns before your exam is as valuable as memorizing the facts.

Trap 1: date confusion, 1992 vs 1993 vs 1995

Three dates appear in Core content:

  • July 1, 1992, venting prohibition effective for CFCs and HCFCs
  • November 15, 1993, recovery equipment manufacture cutoff (the 80 and 90 percent thresholds)
  • November 15, 1995, HFCs added to the venting prohibition

Questions mix these dates as distractors. A technician who memorizes only 1992 picks it for all three. The fix: build a three row table and memorize what each date applies to, not just the date.

Trap 2: recovery vs recycling vs reclamation

Technicians confuse recycling and reclamation. The correct test:

  • Can it be done on site? Yes is recycling. No, it must go to a facility, is reclamation.
  • Can the refrigerant be sold to a new owner? Only if reclaimed.
  • Does it meet ARI-700 purity? Only reclaimed refrigerant.

Trap 3: system dependent vs self contained

Self contained does not mean the technician works alone. It means the recovery machine has its own self contained compressor. System dependent means the recovery depends on the appliance's own system compressor. Reverse the assumption your first instinct applies.

Trap 4: terminology, venting vs purging

The exam uses venting to mean intentional or uncontrolled release of refrigerant, prohibited under Section 608. Purging means removing non condensable gases from a system using a purge unit, a legitimate service procedure for low pressure chillers. Questions that offer both as choices test whether you know the regulatory distinction, not just the vocabulary.

Trap 5: the three tier leak rate system

Technicians who know only one leak rate threshold, usually 10 percent, fail questions about commercial refrigeration (20 percent) or industrial process (35 percent) systems. When a leak rate question describes a walk in cooler or a commercial refrigeration rack, the threshold is 20 percent, not 10 percent. Identify the equipment category before you pick a leak rate answer.

How to use practice tests effectively

Practice one section at a time. The Core section establishes the legal framework that the type specific content builds on. Master Core before you move to Type I, Type II, or Type III.

Review every wrong answer. Do not mark a wrong answer and move on. Decide whether you missed the fact (a knowledge gap) or misread the question (a test taking error). Different errors need different fixes.

Practice under time pressure. A 25 question section should take no more than 45 minutes. Time yourself, because rushing near the end of a section is a common source of avoidable errors.

Aim well above 72 percent before you schedule. If you consistently score in the high 80s on practice tests, you have margin above the 72 percent passing threshold to absorb exam day pressure and unfamiliar phrasing. See the exact counts in the EPA 608 passing score guide.

More practice questions

Q1: What term describes removing non condensable gases from a centrifugal chiller system?
A) Venting    B) Purging    C) Recovery    D) Recycling
Answer: B. Purging, via a purge unit, removes non condensable gases (air and moisture) from low pressure chiller systems. Venting is the illegal intentional release of refrigerant. Recovery removes refrigerant from a system into a recovery cylinder.
Q2: When did the Section 608 venting prohibition first take effect for CFCs and HCFCs?
A) July 1, 1992    B) November 15, 1993    C) November 15, 1995    D) January 1, 2000
Answer: A. The venting prohibition for CFCs (R-11, R-12) and HCFCs (R-22) took effect July 1, 1992. The November 15, 1993 date applies to recovery equipment manufacture standards. The November 15, 1995 date applies to when HFCs were added to the prohibition.
Q3: A system with 75 lbs of R-410A used for office comfort cooling has lost 8 lbs in the past year. Is mandatory repair required?
A) Yes, 8 lbs exceeds the 10 percent threshold (7.5 lbs)    B) No, only commercial refrigeration systems require mandatory repair    C) No, the threshold is 20 percent for R-410A systems    D) Yes, any leak over 5 lbs requires mandatory repair
Answer: A. 10 percent of 75 lbs is 7.5 lbs. The system lost 8 lbs, exceeding the 10 percent comfort cooling threshold, so repair is required. The equipment type (office comfort cooling) sets the 10 percent threshold, not the refrigerant type.
Q4: Which process requires an EPA certified third party facility and results in refrigerant meeting ARI-700 purity standards?
A) Recovery    B) Recycling    C) Reclamation    D) Reprocessing on site
Answer: C. Reclamation must be performed at an EPA certified reclamation facility and produces refrigerant meeting ARI-700 purity, equivalent to virgin refrigerant. Only reclaimed refrigerant may be sold to a different owner. Recovery and recycling can be done on site.
Q5: A technician uses the small appliance's own compressor to move refrigerant to a recovery cylinder. What is this called?
A) Self contained recovery    B) System dependent recovery    C) Active recovery    D) Passive recovery
Answer: B. System dependent recovery uses the appliance's own compressor as the pumping mechanism. Self contained recovery uses a separate recovery machine with its own compressor that operates independently of the appliance.
Q6: What is the minimum recovery percentage when recovering from a small appliance with a non operating compressor using system dependent recovery?
A) 70 percent    B) 80 percent    C) 90 percent    D) 95 percent
Answer: B. When the appliance compressor is not operating, the minimum recovery threshold is 80 percent. When the compressor is operating, the threshold is 90 percent. The lower threshold with the compressor off reflects that system dependent recovery is less effective without compressor help.
Q7: For EPA 608 purposes, purging a chiller refers to what action?
A) Illegally venting refrigerant    B) Removing non condensable gases (air and moisture) using a purge unit    C) Recovering all refrigerant before service    D) Pressurizing the system with nitrogen
Answer: B. Purging in chiller service means using a purge unit to remove non condensable gases (air and moisture) from the condenser top. It is a legitimate service procedure for low pressure systems, distinct from the prohibited action of venting refrigerant.
Q8: Which EPA 608 exam section is mandatory regardless of which certification type a technician seeks?
A) Type II, the most common certification    B) Universal, the highest level    C) Core, required for all certification types    D) Type I, required as a prerequisite
Answer: C. The Core section tests Clean Air Act Section 608 law, venting prohibitions, civil penalties, and refrigerant classification, foundational knowledge required for all technicians. No type specific certificate is valid without a passing Core score.
Q9: What is the annual leak rate threshold that triggers mandatory repair for commercial refrigeration systems with 50 lbs or more of refrigerant?
A) 10 percent    B) 15 percent    C) 20 percent    D) 35 percent
Answer: C. Commercial refrigeration systems (walk in coolers, display cases, reach in units) with 50 lbs or more of refrigerant have a 20 percent annual leak rate threshold for mandatory repair, higher than the 10 percent comfort cooling threshold but lower than the 35 percent industrial process threshold.
Q10: True or false: recovered refrigerant that has been recycled on site can be sold to a new equipment owner.
A) True    B) False
Answer: B, false. Recycled refrigerant, cleaned on site through oil separation and filter drier passes, may only be returned to the original owner's equipment. It does not meet ARI-700 purity standards and cannot be sold to a different owner. Only reclaimed refrigerant, ARI-700 certified by an EPA certified facility, may be resold.

Looking for the key numbers and rules to memorize? See the EPA 608 cheat sheet for every critical threshold, date, and regulation in one place.

Practice test FAQ

Are there free EPA 608 practice tests with answers?
Yes. This page includes sample questions with explained answers, and the full bank of 569 verified questions is free with an account. Full timed practice exams by section are at /core.html, /type-1.html, /type-2.html, and /type-3.html.
How many times can I take the EPA 608 practice test?
Practice tests on this site can be taken as many times as you want. The real EPA 608 exam has no federal retake limit.
Is the real EPA 608 exam harder than practice tests?
Well built practice tests match the real exam difficulty closely. The proctored exam adds the pressure of monitoring and timing that can make it feel harder, but the content difficulty is comparable. You still need 18 of 25 correct, which is 72 percent, to pass each section.

Ready for a full timed practice test?

Run a complete 25 question section under exam conditions, then review every miss with a full explanation. Start with Core, the section every certification depends on.

608 Core practice test 608 Type II practice test

Part of the EPA 608 study guides collection

This practice Q and A is part of the complete EPA 608 study guides library, with full section by section guides for Core, Type I, Type II, Type III, Universal, and a condensed cheat sheet.