EPA 608 Practice Test
常见问题
How many EPA 608 practice questions are here?+
240 original practice questions across all four sections — Core, Type I (small appliances), Type II (high-pressure), and Type III (low-pressure) — plus recovery/recycling, in English and Español, with a 40 CFR Part 82 or Clean Air Act §608 citation on most answers.
Is this EPA 608 practice test free?+
Yes — completely free, no signup. Unlimited rounds, a full timed mock exam, and explanations included. The official EPA 608 certification exam (about $20-$100) is taken separately through an EPA-approved organization.
Are these real EPA 608 exam questions?+
No. All 240 questions are original prose written from the public-domain Clean Air Act Section 608 and 40 CFR Part 82. We never copy from any prep provider or the real exam.
How is the EPA 608 exam structured and what's the passing score?+
It has four sections — Core plus Type I, II, and III — 25 questions each, and you need 70% (about 18 of 25) to pass each. Passing Core plus all three types earns Universal certification. Core and the Type sections are proctored.
Does the EPA 608 certification expire?+
No — EPA Section 608 technician certification is valid for life and never expires.
What languages is the EPA 608 exam available in?+
Many EPA-approved organizations offer it in English and Spanish. PrepPass practice is available in English and Español.
样题与解析
以下是本题库中的部分真题与完整解析。完整题库请用上方的刷题工具。
- 1. Core (Universal)
Why is the stratospheric ozone layer important to life on Earth?
- a.It produces the oxygen that people breathe
- b.It absorbs harmful ultraviolet (UV) radiation from the sun
- c.It reflects radio signals back to the surface
- d.It traps heat and keeps the planet warm
答案: b
解析: The ozone layer in the stratosphere absorbs most of the sun's harmful ultraviolet (UV) radiation, which protects humans, animals, and plants. It does not warm the planet like greenhouse gases do, produce breathable oxygen, or reflect radio signals. Protecting this layer is the main reason Section 608 limits the release of ozone-depleting refrigerants.
- 2. Core (Universal)
The EPA program that reviews and lists acceptable substitute refrigerants for specific end uses is called:
- a.The DOT Hazmat program
- b.The OSHA Refrigerant Registry
- c.The ARI Reclamation program
- d.The SNAP (Significant New Alternatives Policy) program
答案: d
解析: The Significant New Alternatives Policy (SNAP) program reviews substitute refrigerants and lists them as acceptable or unacceptable for specific end uses based on overall risk to health and the environment. DOT regulates transport, OSHA regulates workplace safety, and AHRI (formerly ARI) sets the reclamation purity standard. A refrigerant may be listed as acceptable only for certain applications.
- 3. Regulations & Safety
Which personal protective equipment (PPE) is most appropriate whenever a technician handles pressurized refrigerant?
- a.Safety glasses (or goggles) and refrigerant-rated gloves
- b.A hard hat only
- c.No PPE is needed for HFCs
- d.Sandals and short sleeves for comfort
答案: a
解析: Because pressurized refrigerant can cause frostbite and eye injury, technicians should wear safety glasses or goggles and refrigerant-rated gloves whenever handling it. A hard hat alone does not protect eyes or hands, sandals and short sleeves leave skin exposed, and PPE is still needed for HFCs. Proper PPE is a basic safe-handling requirement for all refrigerants.
- 4. Regulations & Safety
A technician recovering R-404A from a walk-in freezer notices the recovery cylinder is getting cold and recovery has slowed. What technique safely speeds recovery?
- a.Vent some vapor to make room
- b.Heat the recovery cylinder with a torch
- c.Cool the recovery cylinder (e.g., with a wet cloth or ice) and/or recover liquid first to lower cylinder pressure
- d.Disconnect and let it finish on its own overnight
答案: c
解析: Recovery slows as the recovery cylinder warms and its pressure rises, so cooling the recovery cylinder and recovering liquid where possible lowers cylinder pressure and speeds the process. Using a torch is dangerous, venting vapor is illegal, and simply walking away does not complete recovery. Keeping the recovery cylinder cooler than the source lowers the pressure differential the machine must overcome.
- 5. Type I — Small Appliances
Which EPA technician certification allows a person to service and dispose of small appliances?
- a.Type I certification (or Universal, which includes Type I)
- b.Type III only
- c.No certification is needed for small appliances
- d.Type II only
答案: a
解析: Type I certification covers the service and disposal of small appliances. A Universal certification also qualifies a technician because it includes Type I, II, and III. Anyone who opens a small appliance to the atmosphere for service or disposal must hold at least Type I certification.
依据: 40 CFR §82.161
- 6. Type II — High-Pressure
A technician is certifying to work on R-22 and R-410A air conditioners, supermarket racks, and heat pumps. Which EPA technician type covers high-pressure and very-high-pressure appliances?
- a.Type III
- b.Type I
- c.Type II
- d.Section 609 only
答案: c
解析: Type II certification covers high-pressure and very-high-pressure appliances, such as R-22 and R-410A systems, supermarket racks, and heat pumps. Type I covers small appliances and Type III covers low-pressure appliances. A Universal certification includes all three types.
依据: 40 CFR §82.152
- 7. Type II — High-Pressure
A technician performing recovery notices the process is very slow because the recovery cylinder is warm and its pressure is high. Which action will speed recovery?
- a.Cool the recovery cylinder (for example in an ice-water bath) to lower its pressure
- b.Disconnect the vacuum pump
- c.Warm the recovery cylinder with a torch
- d.Add nitrogen to the recovery cylinder
答案: a
解析: Cooling the recovery cylinder lowers its internal pressure, increasing the pressure difference that drives refrigerant into it and speeding recovery. Warming the cylinder raises its pressure and slows the process. Adding nitrogen would contaminate the refrigerant with noncondensables and is not acceptable.
- 8. Type III — Low-Pressure
Frequent operation of the purge unit on a low-pressure chiller is usually a sign that:
- a.The refrigerant charge is too high
- b.The machine has a leak drawing air in
- c.The compressor is overcharged with oil
- d.The condenser water is too cold
答案: b
解析: A rising purge rate means air is leaking into the vacuum side of the chiller, so the purge unit runs more often to remove it. The correct response is to find and repair the leak, not simply purge more. Modern high-efficiency purge units also track how much they run as a diagnostic.
- 9. Type III — Low-Pressure
A technician recovering R-123 reaches 25 mm Hg absolute but the reading rises back up after the recovery machine stops. This usually indicates:
- a.The recovery is complete and correct
- b.The cylinder is empty
- c.Refrigerant is still boiling out of the oil or the machine has a leak
- d.The rupture disk has failed
答案: c
解析: If the vacuum will not hold and pressure rises after the machine stops, refrigerant is still off-gassing from the oil, or air is leaking into the appliance or hoses. You must continue recovery or find the leak before considering the job done. A stable 25 mm Hg absolute is the target.
依据: 40 CFR §82.156
- 10. Recovery & Recycling
How often must a refillable recovery cylinder undergo a hydrostatic test to remain legal for use?
- a.Only once when new
- b.Every ten years
- c.Every year
- d.Every five years
答案: d
解析: A refillable DOT recovery cylinder must be hydrostatically tested every five years, and the test date is stamped on the cylinder. Using a cylinder past its test date is unsafe and not permitted. Always confirm the test date before filling.