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EPA Section 608 Universal Certification Exam practice questions

241 free questions with answers and explanations.

Practice test
  1. 151.A technician is preparing to ship a recovered refrigerant cylinder containing R-407C. Which of the following DOT requirements must be met before shipment?Core
  2. 152.A technician is preparing to charge a low-pressure refrigeration system with R-123. Which of the following is the correct procedure to ensure the system is properly dehydrated and ready for charging?Type III (Low-Pressure Appliances)
  3. 153.A technician is performing a leak check on an R-22 refrigeration system. Which of the following methods is generally considered the most effective for pinpointing the exact location of a small leak?Core
  4. 154.A technician is preparing to charge a low-pressure chiller with R-123. Which of the following safety precautions is most critical when handling this refrigerant?Type III (Low-Pressure Appliances)
  5. 155.A technician is performing a routine service on a high-pressure refrigeration system that uses R-410A. During the service, the technician needs to recover the refrigerant. What is the maximum allowable pressure to which the system must be evacuated during recovery before opening it for non-major repairs?Core
  6. 156.A technician is decommissioning a low-pressure chiller containing 120 lbs of R-123. The chiller was manufactured in 1995. What is the EPA-required recovery level for this appliance?Type III (Low-Pressure Appliances)
  7. 157.A technician is performing a leak test on a system operating with R-123. If the system is found to be leaking, what is the required initial evacuation level before recharging, assuming the system is a low-pressure appliance?Core
  8. 158.A technician is evacuating a system after a major component replacement. To properly dehydrate the system, what vacuum level must be achieved and maintained, and what is the primary purpose of reaching this specific level?Core
  9. 159.A technician is performing maintenance on a residential split system that uses R-410A. The system has a liquid line filter drier. What is the primary function of this component?Core
  10. 160.A technician is installing a new split system that uses R-410A. Which of the following components helps to prevent liquid refrigerant from returning to the compressor, especially during low-load conditions?Core
  11. 161.A technician is evacuating a large system that uses R-407C. To ensure proper dehydration and removal of non-condensable gases, what is the recommended evacuation level for this type of system?Core
  12. 162.A low-pressure chiller requires a new heat exchanger. Before opening the system for this component replacement, what is the critical step to prevent air and moisture contamination?Type III (Low-Pressure Appliances)
  13. 163.After recovering refrigerant from a low-pressure appliance, a technician finds that the system pressure has risen from the required vacuum to 0 psig within a few minutes. What is the most likely cause?Type III (Low-Pressure Appliances)
  14. 164.A technician is installing a new commercial refrigeration system that will operate with R-404A. Which of the following statements about the oils used with R-404A is correct?Core
  15. 165.A technician is performing a recovery of R-123 from a low-pressure chiller. The recovery unit is operating, but the recovery rate is very slow, and the pressure in the chiller is not decreasing as expected. Which of the following is a common cause for a slow recovery rate in a low-pressure system?Type III (Low-Pressure Appliances)
  16. 166.A technician is working on a centrifugal chiller that uses R-123. Due to the very low operating pressure, which of the following is the most significant concern when operating this type of system?Core
  17. 167.A large low-pressure chiller containing 300 lbs of R-11 is being recovered. The EPA requires that the refrigerant be recovered to a specific vacuum level. What is the maximum allowable pressure in the system after recovery, assuming the recovery device was manufactured after November 15, 1993?Type III (Low-Pressure Appliances)
  18. 168.A technician is storing recovered R-22 refrigerant in a refillable cylinder. According to DOT regulations, what is the maximum amount of refrigerant that can be safely filled into a 30 lb capacity cylinder for R-22, considering its fill ratio of 0.82 lbs/lb?Core
  19. 169.A technician is working on a low-pressure chiller operating with R-123. Which of the following is a common issue with these systems due to their operating pressures?Core
  20. 170.What is the primary environmental concern associated with the release of hydrofluorocarbon (HFC) refrigerants into the atmosphere?Core
  21. 171.Which component of a low-pressure chiller system is designed to remove non-condensable gases from the system?Type III (Low-Pressure Appliances)
  22. 172.A technician is performing a pressure test on a new refrigeration system using nitrogen. What is the maximum safe test pressure for a low-pressure system (e.g., one designed for R-123) when using nitrogen?Core
  23. 173.When evacuating a low-pressure chiller, why is it common practice to add a small amount of nitrogen to the system to break the vacuum before removing the vacuum pump?Type III (Low-Pressure Appliances)
  24. 174.A technician is preparing to recover refrigerant from a low-pressure chiller. Which of the following is an acceptable method for increasing the pressure in the chiller to aid in refrigerant recovery?Type III (Low-Pressure Appliances)
  25. 175.A technician is servicing an existing refrigeration system that uses R-22. Due to the phase-out of R-22, the customer is considering a 'drop-in' substitute. Which of the following statements about 'drop-in' refrigerants is true?Core
  26. 176.A technician is checking the superheat of a commercial refrigeration system. Which of the following is the correct calculation for determining superheat?Core
  27. 177.During a routine inspection of a low-pressure chiller, a technician observes oil in the purge unit's sight glass. What does this observation most likely indicate?Type III (Low-Pressure Appliances)
  28. 178.Which of the following statements accurately describes the primary environmental impact of hydrofluorocarbons (HFCs) like R-410A and R-134a?Core
  29. 179.Which of the following is an acceptable method for determining if a low-pressure chiller with a refrigerant charge of 100 lbs has a significant leak, as defined by EPA regulations for comfort cooling appliances?Type III (Low-Pressure Appliances)
  30. 180.A technician is checking the subcooling of a commercial refrigeration system. Which of the following statements accurately describes what subcooling indicates?Core
  31. 181.A technician is performing a routine maintenance check on a low-pressure chiller. They observe that the purge unit is running frequently, and there is a noticeable increase in system operating pressure. What does this indicate?Type III (Low-Pressure Appliances)
  32. 182.A technician is installing a new split system using R-410A. Which type of oil is recommended for use with R-410A?Core
  33. 183.A technician is recovering refrigerant from a low-pressure chiller that contains 60 lbs of R-123. The recovery equipment was manufactured before November 15, 1993. What is the EPA-mandated recovery vacuum level for this scenario?Type III (Low-Pressure Appliances)
  34. 184.A low-pressure chiller using R-123 has been repaired after a leak. Before being returned to service, what is the maximum allowable pressure the system can be pressurized to for a leak test?Type III (Low-Pressure Appliances)
  35. 185.What is the primary function of a water box in a low-pressure chiller system?Type III (Low-Pressure Appliances)
  36. 186.A low-pressure chiller has a significant leak. The EPA defines a 'significant leak' for comfort cooling low-pressure appliances as a leak rate exceeding what percentage of the total charge per year?Type III (Low-Pressure Appliances)
  37. 187.A technician is about to perform maintenance on a low-pressure chiller. Before opening the system, what is the correct procedure to ensure that no air enters the system?Type III (Low-Pressure Appliances)
  38. 188.During evacuation of a low-pressure chiller, if a significant amount of moisture is present in the system, what is the most effective method to remove it?Type III (Low-Pressure Appliances)
  39. 189.A technician is servicing a residential split system with R-410A. Which of the following components is primarily responsible for converting high-pressure liquid refrigerant into a low-pressure liquid-vapor mixture before it enters the evaporator?Core
  40. 190.A technician is evacuating a low-pressure chiller before charging. The primary purpose of dehydrating the system to a deep vacuum is to remove:Type III (Low-Pressure Appliances)
  41. 191.A technician is performing a recovery from a low-pressure chiller. After the bulk liquid has been removed, what must be done to ensure all remaining refrigerant vapor is recovered?Type III (Low-Pressure Appliances)
  42. 192.A technician is installing a new walk-in cooler that uses R-404A. What is the primary reason why it is critical to charge the system with R-404A as a liquid, even though it's a refrigeration system?Core
  43. 193.A technician is preparing to ship a recovered refrigerant cylinder containing R-134a. According to DOT regulations, what specific type of label is primarily required for this cylinder?Core
  44. 194.A technician is leak-checking a low-pressure chiller using a halide torch. What important safety precaution must be observed when using this method?Type III (Low-Pressure Appliances)
  45. 195.Why is it critical to recover both liquid and vapor refrigerant from a low-pressure chiller?Type III (Low-Pressure Appliances)
  46. 196.Which of the following describes the typical pressure of refrigerant in the evaporator of a low-pressure chiller when it is operating?Type III (Low-Pressure Appliances)
  47. 197.Under EPA Section 608 regulations, what is the maximum permissible level of non-condensable gases in a recovered refrigerant cylinder that is intended for reuse?Core
  48. 198.A technician is recovering refrigerant from a system that has experienced a compressor burnout. Which of the following precautions must be taken during the recovery process?Core
  49. 199.A technician is decommissioning a low-pressure chiller that contains 150 lbs of R-11. The EPA-mandated recovery level for this appliance, considering its charge size, is:Type III (Low-Pressure Appliances)
  50. 200.A technician is performing a recovery from a low-pressure chiller. To ensure maximum efficiency and prevent liquid refrigerant from entering the recovery compressor, what component should be used in the recovery setup?Type III (Low-Pressure Appliances)