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EPA Section 608 Universal Certification Exam practice questions

241 free questions with answers and explanations.

Practice test
  1. 201.Which of the following refrigerants is considered a very low-pressure refrigerant and requires specific recovery techniques due to its operating pressure below atmospheric pressure?Core
  2. 202.A technician is performing a leak test on a low-pressure chiller operating with R-123. If the annual leak rate exceeds 30% of the full charge, what action is mandated by EPA regulations?Core
  3. 203.A low-pressure chiller has been evacuated to the required vacuum level. Before charging, a technician performs a standing vacuum test and observes that the system pressure rises from 25 inches Hg vacuum to 10 inches Hg vacuum over 10 minutes. What does this pressure rise most likely indicate?Type III (Low-Pressure Appliances)
  4. 204.A low-pressure chiller has been evacuated to the required vacuum level. Before charging, a standing vacuum test is performed. If the system pressure rises from 500 microns to 1500 microns within 15 minutes, what does this indicate?Type III (Low-Pressure Appliances)
  5. 205.Under Section 608 of the Clean Air Act, what is required before disposing of a household refrigerator?Core
  6. 206.A technician is recovering refrigerant from a system that contains a large amount of moisture. Which of the following recovery methods is most effective in preventing moisture from freezing and potentially damaging the recovery equipment?Core
  7. 207.A technician is performing a recovery from a low-pressure chiller. To prevent air from entering the recovery unit and subsequently into the chiller, what action should be taken when connecting the recovery hoses?Type III (Low-Pressure Appliances)
  8. 208.A technician is performing a leak check on a low-pressure chiller operating with R-123. What is the maximum allowable leak rate for this appliance before repairs are mandated by EPA regulations?Core
  9. 209.A technician is performing a leak test on a low-pressure chiller using soap bubbles. At what pressure should the system typically be pressurized for this type of test?Type III (Low-Pressure Appliances)
  10. 210.A technician is recovering refrigerant from a low-pressure system. To prevent freezing of the water in the chiller barrel during recovery, which of the following measures should be taken?Type III (Low-Pressure Appliances)
  11. 211.A technician is performing a routine maintenance check on a commercial refrigeration unit. Which of the following safety precautions should always be observed when working with refrigerants?Core
  12. 212.A technician is preparing to charge a low-pressure chiller with R-123. The most accurate way to charge the system is by:Type III (Low-Pressure Appliances)
  13. 213.A technician is performing a recovery on a low-pressure chiller containing R-123. The EPA-mandated recovery vacuum level for appliances with a full charge of 35 pounds or more, using recovery equipment manufactured after November 15, 1993, is:Type III (Low-Pressure Appliances)
  14. 214.Which of the following refrigerants has the highest Ozone Depletion Potential (ODP)?Core
  15. 215.A technician is preparing to recover refrigerant from a system that has had a compressor burnout. Which of the following is crucial to prevent contamination of the recovery machine and subsequent systems?Core
  16. 216.When charging a low-pressure chiller, why is it critical to introduce refrigerant into the system's lowest possible pressure point, such as the condenser or liquid line, after achieving a vacuum?Type III (Low-Pressure Appliances)
  17. 217.A low-pressure chiller's purge unit is continuously running. After checking for leaks and finding none, what is the most likely cause for the continuous operation of the purge unit?Type III (Low-Pressure Appliances)
  18. 218.A technician is preparing to ship a recovered refrigerant cylinder containing R-407C. According to DOT regulations, which of the following is NOT required for proper labeling and documentation?Core
  19. 219.Which of the following describes the condition of the refrigerant in a low-pressure chiller's evaporator during normal operation?Type III (Low-Pressure Appliances)
  20. 220.A technician is evacuating a system to remove non-condensables and moisture. What is the primary purpose of evacuating a refrigeration system to a deep vacuum?Core
  21. 221.Which of the following refrigerants is classified as a low-pressure refrigerant under EPA Section 608 regulations?Type III (Low-Pressure Appliances)
  22. 222.A technician is installing a new residential split system that uses R-410A. Which of the following components should be installed in the liquid line to protect the system from moisture and contaminants after installation or during major repairs?Core
  23. 223.A technician is performing a leak check on an R-410A system. Which type of leak detector is generally considered the most effective for pinpointing small leaks of HFC refrigerants?Core
  24. 224.Which component in a vapor compression refrigeration system is responsible for absorbing heat from the conditioned space and boiling the refrigerant into a vapor?Core
  25. 225.According to EPA Section 608 regulations, what is the maximum amount of refrigerant that can be charged into a system before a leak repair is required, assuming the system is not a comfort cooling appliance or a commercial refrigeration appliance?Core
  26. 226.A technician is preparing to charge a low-pressure chiller with R-123. Which of the following is the safest and most accurate method for adding the initial charge to the system?Type III (Low-Pressure Appliances)
  27. 227.A technician is performing a leak test on a low-pressure chiller. Which of the following leak detection methods is most effective for pinpointing small leaks in this type of system?Type III (Low-Pressure Appliances)
  28. 228.A technician is performing a vapor recovery from a low-pressure chiller. What is the primary method used to maximize the efficiency of vapor recovery from the chiller?Type III (Low-Pressure Appliances)
  29. 229.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)
  30. 230.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)
  31. 231.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
  32. 232.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
  33. 233.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)
  34. 234.A low-pressure chiller using HCFC-123 has developed a leak. The EPA requires that the leak rate be reduced to below what percentage within 18 months for industrial process refrigeration (IPR) systems?Type III (Low-Pressure Appliances)
  35. 235.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
  36. 236.A technician has completed a leak repair on a small appliance containing R-134a. What is the next crucial step before recharging the system?Type I (Small Appliances)
  37. 237.A technician is performing a recovery on a small appliance containing R-12. If the appliance has an operating compressor, which method would generally yield the fastest recovery rate?Type I (Small Appliances)
  38. 238.A technician is preparing to recover refrigerant from a small appliance. What is the maximum allowable pressure for a recovery cylinder containing mixed refrigerants?Type I (Small Appliances)
  39. 239.A technician is performing a leak test on a low-pressure chiller operating with R-123. If the leak rate exceeds the EPA threshold for comfort cooling, how long does the technician have to repair the leak and verify the repair?Core
  40. 240.A technician is preparing to recover refrigerant from a small appliance that uses R-600a (isobutane). Which of the following statements about safe work practices for R-600a is TRUE?Type I (Small Appliances)
  41. 241.A technician is performing a recovery on a small appliance with a non-operating compressor. To maximize the recovery of refrigerant using a system-dependent (passive) recovery device, what action should the technician take?Type I (Small Appliances)