Download EPA Section 608 Technician Practice Exam and more Exams Technology in PDF only on Docsity!
Question 1. Which of the following best describes the Ozone Depletion Potential (ODP) of R‑22? A) 0. B) 0. C) 0. D) 1. Answer: C Explanation: R‑22 (HCFC‑22) has an ODP of about 0.05–0.07; the closest listed value is 0.5, but the correct ODP is actually 0.05. The exam expects recognition that HCFCs have low but non‑zero ODP, unlike CFCs (1.0). Question 2. Under the Clean Air Act Section 608, who is legally allowed to purchase refrigerants? A) Any homeowner B) Certified HVAC technicians only C) Appliance manufacturers D) Wholesale distributors only Answer: B Explanation: Section 608 prohibits the sale of refrigerants to anyone who is not a certified technician, ensuring proper handling and record‑keeping. Question 3. What is the primary purpose of the Montreal Protocol? A) To limit carbon dioxide emissions B) To phase out ozone‑depleting substances worldwide C) To regulate the sale of HFCs in the United States D) To establish minimum energy efficiency standards for appliances Answer: B
Explanation: The Montreal Protocol is an international treaty that aims to protect the ozone layer by phasing out production and consumption of ODS such as CFCs and HCFCs. Question 4. Which refrigerant has the highest Global Warming Potential (GWP) among the following? A) R‑134a B) R‑404A C) R‑410A D) R‑ 12 Answer: B Explanation: R‑404A has a GWP of roughly 3,922, higher than R‑134a (~1,430) and R‑410A (~2,088). R‑ 12 ’s GWP is about 10,900 but it is not listed among modern HFCs; the exam focuses on commonly used HFCs. Question 5. The venting prohibition under Section 608 bans the intentional release of which refrigerants? A) Only CFCs B) Only HCFCs C) CFCs, HCFCs, and HFCs D) Only HFCs Answer: C Explanation: The law prohibits knowingly venting CFCs, HCFCs, and HFCs during maintenance, repair, or disposal. Question 6. When was the production of new R‑12 equipment phased out in the United States? A) 1990 B) 1994
Question 9. Which of the following is required for recovery equipment to be considered “third‑party certified”? A) Manufacturer’s warranty of at least 2 years B) Certification by an EPA‑approved testing laboratory C) Approval by the local fire marshal D) Registration with the Department of Transportation (DOT) Answer: B Explanation: Recovery or recycling equipment must be tested and certified by an EPA‑approved third‑party lab to ensure it meets performance standards. Question 10. What is the minimum vacuum level required when evacuating a system to remove moisture and non‑condensables? A) 10 in. Hg absolute B) 15 in. Hg absolute C) 20 in. Hg absolute D) 25 in. Hg absolute Answer: C Explanation: EPA requires a vacuum of at least 20 in. Hg absolute (or better) to ensure adequate removal of moisture and air. Question 11. Moisture in a refrigeration system can lead to which of the following detrimental effects? A) Increased lubricity of oil B) Formation of hydrochloric acid C) Lowering of system pressure D) Increased refrigerant charge Answer: B
Explanation: Water reacts with refrigerants and oil at high temperatures, forming acids (e.g., hydrochloric acid) that corrode copper and other components. Question 12. Which factor does NOT affect the speed of refrigerant recovery? A) Ambient temperature B) Size of the recovery cylinder C) Whether the equipment is in a liquid or vapor state D) The color of the recovery hose Answer: D Explanation: The hose color is for identification only and does not influence recovery speed. Question 13. When mixing refrigerants, which of the following statements is TRUE? A) Small amounts of a different refrigerant can be ignored. B) Mixing is prohibited because it can create unknown properties. C) Mixing is allowed if the total charge does not exceed 10 lb. D) Mixing is permissible if both refrigerants have the same ODP. Answer: B Explanation: EPA regulations prohibit mixing refrigerants because it can create unsafe, untested blends and complicates recovery. Question 14. Which oil type is compatible with R‑134a (an HFC)? A) Mineral oil B) Polyolester (POE) oil C) Alkylbenzene oil D) Silicone oil Answer: B
Answer: D Explanation: EPA limits cylinder fill to no more than 80 % of the cylinder’s rated weight to allow for expansion and safe handling. Question 18. Which gas is prohibited for use in leak testing of refrigeration systems? A) Nitrogen B) Compressed air C) Helium D) Carbon dioxide Answer: B Explanation: The EPA specifically bans using compressed air for leak testing because it can introduce moisture; nitrogen with a regulator is the approved method. Question 19. At high temperatures, the decomposition of CFC‑based refrigerants can produce which toxic gas? A) Carbon monoxide B) Phosgene C) Hydrogen sulfide D) Chlorine dioxide Answer: B Explanation: Thermal decomposition of CFCs can generate phosgene, a highly toxic respiratory irritant. Question 20. How often must reusable refrigerant cylinders undergo hydrostatic testing? A) Every 2 years B) Every 3 years C) Every 5 years
D) Every 10 years Answer: C Explanation: EPA requires hydrostatic testing of reusable cylinders at least once every five years to ensure structural integrity. Question 21. Which of the following is the correct disposal method for a disposable refrigerant cylinder? A) Drop it in a landfill intact B) Release the refrigerant to the atmosphere before disposal C) Reduce pressure to 0 psig and render it unusable D) Melt the cylinder and recycle the metal Answer: C Explanation: Disposable cylinders must be depressurized to zero pressure, rendering them useless before disposal; venting refrigerant is illegal. Question 22. Under DOT regulations, used refrigerant must be shipped in containers that are: A) Unlabeled, as long as they are sealed B) Marked with the hazardous material placard only C) Properly labeled with the UN number and hazard class D) Placed in a wooden box with “fragile” stickers Answer: C Explanation: The DOT requires that used refrigerant containers be labeled with the appropriate UN number, hazard class, and handling instructions. Question 23. Which of the following best defines a “small appliance” under Type I regulations? A) Any system with ≤ 5 lb of refrigerant, factory‑charged and hermetically sealed
Question 26. After completing service on a Type I appliance, what must be done with solderless access fittings? A) Leave them installed for future service B) Replace them with permanent fittings C) Remove them and seal the opening D) Paint them to indicate they have been serviced Answer: C Explanation: EPA requires removal of solderless (quick‑connect) fittings after service to prevent future leaks. Question 27. Which of the following is NOT a legally required leak repair action for Type I appliances? A) Mandatory recovery of refrigerant before repair B) Leak repair within 30 days of detection C) Reporting the leak to the EPA D) No requirement to repair leaks if the appliance is discarded Answer: C Explanation: There is no EPA reporting requirement for small appliance leaks; however, recovery is mandatory, and repair must be completed within 30 days if the appliance remains in service. Question 28. Which of the following is a common sign of a leak in a high‑pressure (Type II) system? A) Excessive oil in the condenser B) Low suction pressure reading C) High discharge temperature D) Frost on the evaporator coil Answer: B
Explanation: Low suction pressure often indicates loss of refrigerant due to a leak in high‑pressure systems. Question 29. The annual leak rate limit for comfort‑cooling appliances containing more than 50 lb of refrigerant is: A) 5 % of the total charge B) 10 % of the total charge C) 15 % of the total charge D) 20 % of the total charge Answer: B Explanation: EPA permits a 10 % annual leak rate for comfort‑cooling appliances with > 50 lb of refrigerant. Question 30. Which method is NOT an EPA‑approved leak detection technique for high‑pressure systems? A) Electronic leak detector B) Soap‑bubble test C) Fluorescent dye injection D) Visual inspection of oil color Answer: D Explanation: While oil discoloration may indicate a problem, it is not an EPA‑approved leak detection method. Question 31. How soon must a leak in a commercial refrigeration system be repaired after detection? A) Within 15 days B) Within 30 days C) Within 45 days
C) Replacement of a non‑critical fan motor D) Cleaning of the condenser coils Answer: B Explanation: A major repair involves work that could release a significant amount of refrigerant, such as fixing a leak > 5 % of the charge. Question 35. During recovery, where is the majority of liquid refrigerant typically located in a high‑pressure system? A) In the compressor B) In the evaporator coil C) In the condenser D) In the suction line Answer: C Explanation: In high‑pressure systems, liquid refrigerant accumulates in the condenser (the high‑side) during recovery. Question 36. Which of the following appliances is classified as a Type III (low‑pressure) system? A) Residential split‑system air conditioner B) Centrifugal chiller using R‑ 113 C) Window air‑conditioner with R‑ 22 D. Automotive air‑conditioner with R‑134a Answer: B Explanation: Centrifugal chillers that operate at low pressures and often use older refrigerants like R‑113 fall under Type III. Question 37. A low‑pressure centrifugal chiller must not be tested above which absolute pressure to avoid damage?
A) 30 psig B) 50 psig C) 80 psig D) 120 psig Answer: B Explanation: EPA limits testing pressure for low‑pressure centrifugal chillers to 50 psig absolute to prevent over‑pressurization. Question 38. Which leak detection method is most suitable for low‑pressure systems? A) Electronic leak detector calibrated for high‑pressure B) Hot‑water method or built‑in system heating device C) Ultrasonic detector D) Dye‑based detection only Answer: B Explanation: The hot‑water method or using the system’s built‑in heating/pressurization device is recommended for low‑pressure leak detection. Question 39. The annual leak rate limit for low‑pressure commercial process refrigeration is: A) 5 % of the total charge B) 10 % of the total charge C) 15 % of the total charge D) 20 % of the total charge Answer: B Explanation: EPA sets the same 10 % annual leak rate limit for low‑pressure commercial process refrigeration as for high‑pressure comfort‑cooling.
Explanation: ASHRAE 15 specifies a minimum of 2 inches clearance for low‑pressure piping to reduce fire risk. Question 43. Which of the following refrigerants is classified as an HFC with zero ODP? A) R‑ 11 B) R‑ 22 C) R‑134a D) R‑ 12 Answer: C Explanation: R‑134a (HFC‑134a) has an ODP of 0.0 because it contains no chlorine. Question 44. Which of the following statements about the “very high‑pressure” classification is correct? A) It only applies to systems using R‑22. B) The compressor discharge pressure exceeds 400 psig. C) The suction pressure is always above 150 psig. D) It is synonymous with “low‑pressure.” Answer: B Explanation: Very high‑pressure systems have discharge pressures generally above 400 psig, such as those using R‑410A. Question 45. What is the primary reason that HFCs cannot be used as “drop‑in” replacements for CFCs? A) They are more expensive. B) They require different oil types and may have different pressures. C) They have a pleasant odor. D) They are solid at room temperature.
Answer: B Explanation: HFCs often need POE or PAG oils and operate at different pressures, preventing a simple drop‑in substitution for CFCs. Question 46. Which refrigerant would you expect to find in a system that uses mineral oil as the lubricant? A) R‑134a B) R‑410A C) R‑ 12 D) R‑404A Answer: C Explanation: Mineral oil is compatible with CFCs and HCFCs like R‑12; HFCs require POE oil. Question 47. During a recovery operation, why is it recommended to first recover liquid refrigerant before vapor? A) Liquid is heavier and speeds up the process. B) Vapor cannot be recovered with standard equipment. C) Recovering liquid first reduces the risk of over‑pressurizing the cylinder. D) It prevents oil contamination of the cylinder. Answer: A Explanation: Liquid refrigerant flows faster through the recovery line, decreasing overall recovery time. Question 48. Which of the following best describes a “self‑contained” recovery device? A) A passive system that relies on gravity B) A portable unit with its own compressor and storage tank C) A fixed recovery line installed in the building
C) Ambient temperature D) Oil pressure Answer: A Explanation: The blue gauge is conventionally used for low‑side (suction) pressure readings. Question 52. Which of the following is a direct consequence of over‑charging a system with refrigerant? A) Decreased condenser temperature B) Increased compressor overheating C) Lower suction pressure D) Faster oil circulation Answer: B Explanation: Over‑charging raises discharge pressure and temperature, leading to compressor overheating. Question 53. What is the minimum recommended vacuum level to ensure removal of non‑condensables from a system before charging? A) 5 in. Hg absolute B) 10 in. Hg absolute C) 15 in. Hg absolute D) 20 in. Hg absolute Answer: D Explanation: A vacuum of at least 20 in. Hg absolute is required to adequately remove air and moisture. Question 54. Which of the following is NOT a typical symptom of moisture contamination in a refrigeration system?
A) Formation of sludge in the oil B) Decrease in cooling capacity C) Increased system pressure D) Corrosion of copper tubing Answer: C Explanation: Moisture usually causes pressure drops and reduced capacity, not increased pressure. Question 55. Which of the following refrigerants is classified as a “blended” refrigerant? A) R‑ 22 B) R‑410A C) R‑404A D) R‑ 12 Answer: C Explanation: R‑404A is a blend of several HFCs, whereas R‑22, R‑410A, and R‑12 are single‑component refrigerants. Question 56. When servicing a system that uses POE oil, which of the following should be avoided? A) Using mineral oil as a substitute B) Using nitrogen for leak testing C) Evacuating the system to 20 in. Hg absolute D) Charging as a liquid Answer: A Explanation: POE oil is not compatible with mineral oil; mixing them can cause lubrication failures.
