EPA 608 CORE


1. When a system is operating, refrigerant leaves the condenser as a ______________.




2. A ternary blend refrigerant is a ______________.




3. _____________ refrigerants have the highest ODP.




4. The capacity of a vacuum pump and its suction line size affect ___________.




5. How does the GWP of R-410A compare to carbon dioxide?




6. How does the GWP of R-441A compare to the GWPs of R-410A?




7. Under normal conditions, refrigerant enters the compressor of a refrigeration system as a_______.




8. You heat a system during dehydration ____________________




9. What happens when EPA regulations change after a technician is certified?




10. Which refrigerant is considered a low-pressure refrigerant?




11. Which gas would cause the least damage when used for leak checking?




12. A system is evacuated ___________________.




13. The low-pressure gauge on a typical gauge manifold set is colored ________.




14. When using a nitrogen cylinder ___________.




15. Which of the following gases help form the earth's protective shield?




16. HFO refrigerants are miscible in_________________ lubricants?




17. Hygroscopic oils ________________.




18. In refrigerant accidents where death occurs, the major cause is ___________.




19. ______________ contains chlorine.




20. The release of any CFC, HCFC, or HFC refrigerant during ______________ is illegal.




21. HCFC refrigerants are made up of ___________________.




22. ______________________, only containers designated "refillable" by DOT can be used for transporting recovered pressurized refrigerant.




23. Ester-based oils like POE can be mixed with _____________.




24. _________________ make(s) HFO refrigerants less flammable than HC refrigerants.




25. Which of the following is a lawful use of HCFC-22?




26. What does NOT require Section 608 certification?




27. According to the Roland-Molina theory, _________ are destroyed by each chlorine atom in the stratosphere.




28. The service hose between the system and the vacuum pump should _______.




29. Never heat a recovery tank with an open flame because ________________.




30. A refrigerant cylinder that has a gray body and a yellow top is designed to hold ______________.




31. In addition to the saturation pressure-temperature behavior of two refrigerants, when considering a substitute refrigerant, also consider _______.




32. When a system is operating, refrigerant enters the compressor of a refrigeration system as a ______.




33. _____________ refrigerants are the most harmful to stratospheric ozone.




34. Approved refrigerant recovery cylinders have ____________________.




35. An oil sample should be taken for which of the following reasons?




36. An example of an HCFC refrigerant is:




37. Oxygen or compressed air should never be used to pressurize a system because ___________.




38. Always measure the final system vacuum __________________.




39. What provides the cooling in a vapor compression refrigeration system?




40. Non-azeotropic refrigerants leak from a system ____________.




41. Which of the following statements is true?




42. A compound pressure gauge measures pressure in____________.




43. If R-410A was added to an R-22 system, _______________.




44. ________________damages stratospheric ozone.




45. Which refrigerant contains chlorine?




46. A flammable refrigerant can only burn or explode if the refrigerant concentration is ________.




47. Which of the following is NOT classified as an A3 refrigerant?




48. What is a violation of the Clean Air Act or EPA's regulations?




49. What gas is used as the baseline measurement for GWP?




50. _________________ has the lowest ODP.




51. Non-toxic refrigerants can still cause death because ___________.




52. Never fill a refillable refrigerant cylinder beyond _________________.




53. The high-pressure gauge on a typical gauge manifold set is typically colored______________.




54. Which is NOT a "refrigerant" as it is used in EPA's regulations?




55. When a system is operating, refrigerant enters the expansion device as a _______________




56. During servicing of any refrigeration system, the refrigerant must be______________.




57. When shipping refrigerant cylinders, they should be stored ______________.




58. EPA regulations only allow recovered or recycled refrigerant to be _________________.




59. Use __________________ to determine a safe pressure for leak testing.




60. What gas is used as the baseline measurement for GWP?




61. When a system is operating, the __________________ changes a low-pressure vapor to a high-pressure vapor.




62. _________________ can be recovered into the same cylinder.




63. _______________ is cleaning the refrigerant for immediate reuse by oil separation and single or multiple passes through devices, like replaceable core filter driers.




64. All refrigerants _________________.




65. Never mix different refrigerants in the same container because ___________.




66. What action violates the EPA's prohibition on venting?




67. The EPA's "safe disposal requirements" make the __________________ responsible for ensuring that all refrigerant has been removed from household refrigerators before they are disposed.




68. When measuring a vacuum of the system, the vacuum gauge should be connected ________.




69. According to the EPA, ______________ should be used to remove ice from a sight glass.




70. When a system using POE oil has been opened, what is the minimum evacuation level that should be achieved and held before charging the system?




71. How do scientists know that the chlorine in the stratosphere is not primarily from volcanoes?




72. Ozone contains ______________.




73. When a system is operating, the ________________ changes the refrigerant from a high-pressure vapor to a high-pressure liquid?




74. When servicing an R-22 system you CANNOT _______.




75. A "self-contained" recovery device ________________.




76. The fill level of a recovery cylinder can be determined by _______________.




77. _________________ the speed of evacuation.




78. The ___________ program identifies alternative refrigerants for use.




79. Which additional safety precaution should be followed when using flammable refrigerants?




80. Which of the following synthetic lubricants is used with ternary refrigerant blends containing HCFCs?




81. The EPA considers _________________the most effective for locating the general area of a small leak.




82. Recovery cylinders should never be overfilled because _________________.




83. Which refrigerant release is illegal?




84. The production and import of new R-22 in the U.S. to service existing systems is banned beginning in ________.




85. Which refrigerant(s) must be recovered __________________.




86. State and local governments __________________.




87. Distributors must verify __________________ before they can sell refrigerant.




88. If the compressor crankcase is the coldest part of the system, refrigerant will migrate to the compressor because of the difference in ________________________ in the system.




89. Before disposing of any appliance containing refrigerant __________________.




90. All CFC, HCFC, and HFC refrigerant recovery devices must _________________.




91. Which synthetic oil is commonly used with HFC refrigerants?




92. The ability of a substance to destroy ozone in the stratosphere is referred to as ___________________.




93. Which of the following refrigerants has the lowest global warming potential?




94. Low ambient temperatures _____________ recovery time.




95. What are the characteristics of hydrofluoroolefins and hydrocarbon refrigerants?




96. Which refrigerant release is allowable by the EPA because the refrigerant is "exempt."




97. After proper R-410A refrigerant recovery, you should use _______________ to leak check the system.




98. Which refrigerant can be purchased if you don't have EPA's Section 608 certification?




99. Before working with any unknown solvents, chemicals, or refrigerants, always review the ______.




100. EPA recommends this service practice to conserve refrigerant.




101. EPA regulations require appliances to have ___________.




102. _________________can combine to cause a fire or explosion when working with flammable hydrocarbon refrigerants.




103. What refrigerant servicing does NOT require Section 608 certification?




104. Which of the following proves that HCFCs are in the stratosphere?




105. Refrigerant vapors should never be inhaled because they _______________.




106. When transferring liquid in service hoses, you should guard against trapping ____________.




107. Before shipping any recovered refrigerant, you must _________________.




108. Which of the following refrigerants has the lowest global warming potential?




109. The EPA refers to a "retrofit" as ________________________.




110. Technicians who violate Clean Air Act provisions __________________.




111. What makes HFC refrigerants damaging to the environment?




112. A ________________ recovery device uses the compressor in the appliance and/or the pressure of the refrigerant in the appliance.




113. A system containing a flammable refrigerant must have the process tubes marked with a ________color.




114. If a system cannot maintain a vacuum, the system ______________.




115. _____________________ the speed of dehydration.




116. An oil sample might be taken when ___________________.




117. Before recycling or discarding, a disposable cylinder should be __________.




118. If corrosion is discovered in the body of a relief valve, the valve must be__________.




119. Never operate a hermetic compressor when the system _____________.




120. Which ASHRAE refrigerant safety classification is the safest?




121. Reclaimed refrigerant must be tested to meet __________________ before it can be resold.




122. Ozone depletion in the stratosphere is what type of problem?




123. Recovery cylinders are labeled to indicate the refrigerant inside to ________.




124. How should disposable cylinders be discarded?




125. Which type of refrigerant typically has the lowest global warming potential?




126. What makes HFC refrigerants damaging to the environment?




127. Reusable refrigerant containers that store refrigerant at any pressure above 15 psig (at normal ambient temperature) must be hydrostatically tested every ______________.




128. HFC refrigerants contain ________________________.




129. The pressure range that is typically displayed on a high-pressure manifold gauge is ______.




130. Always ______________ when operating refrigerant recovery or recycling equipment.




131. Which type of refrigerant typically has the lowest global warming potential?




132. How does the GWP of R-441A compare to the GWPs of R-410A?




133. The Department of Transportation (DOT) requires ____________________ when transporting cylinders containing used refrigerant.




134. Which health effect increases from loss of the stratospheric ozone layer?




135. Which refrigerant is an HFC?




136. Why are flammable HFO refrigerants classified as A2L and not A2?




137. ______________ returns refrigerant to new product specifications and requires chemical analysis to verify the purity to AHRI-700 standards.




138. A refrigerant label is placed on the _____________________.




139. How does the GWP of R-410A compare to carbon dioxide?




140. Which refrigerant can fractionate?




141. When planning to recovery flammable refrigerants, always ensure ________.




142. Which of the following is illegal?




143. In there is a large release of refrigerant in a contained area, ______________.




144. Portable refillable tanks must meet ________________ standards.




145. Which refrigerant depletes the ozone layer?




146. A reduction in stratospheric ozone causes _______________.




147. The Montreal Protocol is ________________________.




148. The center port on a three-port manifold used to ______________________.




149. Azeotropic refrigerant mixtures ______________________.




150. CFCs and HCFCs _____________making them capable of reaching the stratospheric ozone layer.




151. Which material is NOT compatible with any HFO refrigerant?




152. Why is venting an "exempt refrigerant" legal?




153. All non-azeotropic refrigerants should be charged as ______________.




154. After a refrigerant is phased-out, supplies of that refrigerant for equipment servicing can only come from __________________.




155. Which is a violation of EPA or Clean Air Act regulations?




156. What is being done in the U.S. to stop damage to the stratospheric ozone layer?




157. The stratospheric ozone layer protects us from ___________________.




158. Ozone depletion is caused by ______________ in HCFC refrigerants.




159. When using nitrogen, _________________.




160. Which is recommended after a burnout?




161. ________________ is the only EPA SNAP approved 'drop-in' replacement for R-22.




162. Service hoses used for system evacuation _________________.




163. ______________ to verify the allowable machine test pressure.




164. Under the EPA's new regulations, when can disposable cylinders be used to recover refrigerant?




165. If technicians lose their certification card, they must_________________.




166. Which of the following is classified as an A2L refrigerant?




167. Which refrigerants is an HFO?




168. Which appliances are NOT covered by EPA regulations?




169. ______________________ means that the refrigerant blend has a range of bubble or dew points at a constant pressure.




170. Over-evacuation of a system can ___________________.




171. All new recovery equipment must __________________________.




172. What are the characteristics of hydrofluoroolefins and hydrocarbon refrigerants?




173. A system is considered dehydrated when ________________________.




174. What is one of the most serious results of loss of the stratospheric ozone layer?




175. ____________________ is the removal of refrigerant from a system and storing it in a container without testing or processing it in any way.




176. When disposing of an appliance with 5-50 pounds of refrigerant, you must record_______________.




177. DOT regulations require the ____________ to be recorded on the shipping paper for hazard class 2.2 Nonflammable Compressed Gases.




178. Which action is a violation of the prohibition on venting refrigerants?




179. Long hoses between the unit and the recovery machine_______________.




180. Which refrigerant is considered a high-pressure refrigerant?




181. What does a Section 608 certification allow a technician to do?




182. Before recharging any flammable hydrocarbon or HFO refrigerant, always ______________.




183. _____________________ refrigerant has an ODP that is greater than 1.





184. A system containing a flammable refrigerant must have the process tubes or service connection marked with a color marking that extends a minimum of ___________ in both directions.





185. How much can a technician be fined for venting a non-exempt refrigerant from a system?





186. Dehydrating means to remove ______________.





187. Refrigerant cylinders should _____________.





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