Core, EPA 608 certification 2026

« Go to categories

Progress: 24% (23/94)

Learning progress ?

1. It is best practice to use dry nitrogen to break the vacuum when dehydrating by the triple evacuation method. However, it:Not learned 2. Approved refrigerant recovery cylinders can be identified by which color code?Not learned 3. What type of synthetic oils are commonly used in new HFC systems and for retrofitting HCFC equipment to HFC refrigerants?Not learned 4. When using nitrogen in repairing a sealed refrigeration system, what should the nitrogen tank always be equipped with?Not learned 5. Which of the following factors affect the speed of system dehydration?Not learned 6. Which of the following repairs would always be considered "major" under EPA's regulations?Not learned 7. When a pungent odor is detected during a sealed system recovery and/or repair which of the following is most likely?Not learned 8. Which of the following best describes low loss fittings on refrigerant recovery devices used to recover CFCs, HCFCs, and HFCs?Not learned 9. What is the state of the refrigerant leaving the receiver in a refrigeration system?Not learned 10. What should be used to remove ice from sight glasses or viewing glasses?Not learned 11. In which component of a system does the refrigerant change from a high-pressure vapor to a high-pressure liquid?Not learned 12. How should refrigerant cylinders be positioned when they are shipped?Not learned 13. Why are some hydrofluoroolefin (HFO) refrigerants classified as "A2L"?Not learned 14. Which of the following gases is used as the baseline measurement for global warming potential?Not learned 15. A very large refrigerant leak can cause suffocation because refrigerants:Not learned 16. When evacuating a system, the use of a severely oversized vacuum pump could:Not learned 17. What are the two factors that, if present, are most likely to lead to an explosion with hydrocarbon refrigerants?Not learned 18. After recovering refrigerant from a sealed system, if nitrogen is used to pressurize or blow debris out of the system, the nitrogen:Not learned 19. Which of the following are recommended safe work practices when recovering refrigerants?Not learned 20. What effect will low ambient temperatures have on recovery?Not learned 21. Which of the following is true if a system will not hold a vacuum after it has been evacuated?Not learned 22. How would you remove moisture from refrigerant in a system?Not learned 23. Which of the following statements about "self-contained" recovery devices is true?Not learned 24. Which leak repair category does the EPA define as air-conditioning appliances used to provide cooling in order to control heat and/or humidity in occupied facilities including, but not limited to, residential, office, and commercial buildings?Not learned 25. What does ozone depletion potential (or 'ODP') measure?Not learned 26. Which of the following refrigerant releases is considered a violation of the prohibition on venting?Not learned 27. What is the service procedure if the refrigerant in a recovery cylinder is suspected to be contaminated?Not learned 28. Before beginning a refrigerant recovery procedure, it is ALWAYS necessary to:Not learned 29. What is the best use for testing with soap bubbles?Not learned 30. What is the component directly following the condenser in a refrigeration system using a thermal expansion valve?Not learned 31. What is the term for removing refrigerant in any condition from a system and storing it in an external container without necessarily testing or processing it in any way?Not learned 32. Which type of refrigerant has the highest ozone depletion potential (ODP)?Not learned 33. When an HFC system with POE oil has been opened for a major system repair, what is the minimum evacuation level that should be achieved before charging the system?Not learned 34. What is the state of the refrigerant entering the compressor of a refrigeration system?Not learned 35. In what state should a system be to measure a final system vacuum?Not learned 36. What must be done before disposing of any appliance containing a CFC, HCFC, or HFC refrigerant?Not learned 37. When corrosion is found within the body of a relief valve, the valve must be:Not learned 38. Which of the following safety precautions should be adhered to for low-pressure systems?Not learned 39. What is the Montreal Protocol?Not learned 40. Which ASHRAE classification means slightly flammable?Not learned 41. What is the Significant New Alternatives Policy (SNAP) Program?Not learned 42. HFCs _______;Not learned 43. Which international agreement (Treaty) regulated the production and use of CFCs, HCFCs, halons, methyl chloroform and carbon tetrachloride?Not learned 44. Which of the following refrigerants is an HFO?Not learned 45. Which of the following refrigerants has a GWP of "1"?Not learned 46. Which of the following has the highest Ozone Depletion Potential?Not learned 47. How much can a person be fined per day per violation for knowingly releasing a regulated substance that violates the Clean Air Act?Not learned 48. The low-side test-pressure data-plate value should be used by a technician to determine a safe pressure for:Not learned 49. Clean refrigerant for reuse by separating the oil from the refrigerant and removing moisture from the refrigerant by passing it through one or more filter driers, is the definition of;Not learned 50. The chlorine in CFCs and HCFCs;Not learned 51. Recover any remaining refrigerant and then render the cylinder useless, then recycle the metal is the proper disposal method for;Not learned 52. The molecule found in CFCs and HCFCs that depletes ozone is:Not learned 53. A single chlorine atom can destroy how many ozone molecules?Not learned 54. Silicone elastomers, for use in seals and gaskets, are not compatible with which refrigerants?Not learned 55. Reusable refrigerant containers under high-pressure must be hydrostatically tested how often?Not learned 56. HCFCs contain;Not learned 57. To process refrigerant to a level equal to new (virgin) product specifications as determined by chemical analysis defines;Not learned 58. Crop loss, eye disease, and skin cancer have been attributed to;Not learned 59. Before shipping any used refrigerant cylinders, check that the cylinder meets what standards:Not learned 60. The compressor __________Not learned 61. The condenser __________Not learned 62. A refrigerant cylinder designed to hold recovered refrigerant has a:Not learned 63. An ozone molecule contains;Not learned 64. Which type of refrigerant contains no chlorine?Not learned 65. Refrigeration technicians who violate the Clean Air Act can:Not learned 66. After 1995, any supplies of CFC refrigerant to service existing units in the USA can only come from:Not learned 67. Refrigerant that is recovered can be returned to:Not learned 68. Refrigerant can not be called "reclaimed" unless it:Not learned 69. The EPA can require a technician to demonstrate their ability to perform proper procedures for recovering and/or recycling refrigerant. Failure to demonstrate competency can result in:Not learned 70. What characteristic(s) of CFCs make them more likely to reach the stratosphere than most other compounds containing chlorine?Not learned 71. A system is considered dehydrated when:Not learned 72. Disposable refrigerant containers are used for _______ refrigerant.Not learned 73. Which refrigerant is an HCFC?Not learned 74. What statement is true about an azeotropic refrigerant mixture?Not learned 75. Chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs) have which of the following in common?Not learned 76. To scrap a disposable cylinder, the internal cylinder pressure should be reduced to at least:Not learned 77. Manifold gauge sets are often color coded, when this is done, the high pressure gauge is color coded:Not learned 78. In general, blended refrigerants should be charged:Not learned 79. Blended refrigerants leak from a system:Not learned 80. Which of the following gases help form the earth's protective shield?Not learned 81. In a refrigeration system, the device that changes a low pressure vapor to a high pressure vapor is the:Not learned 82. Data shows that chlorine in the stratosphere comes mainly from CFCs rather than from natural sources such as volcanoes because:Not learned 83. Which atom of the CFC molecule causes ozone depletion?Not learned 84. The ozone layer protects the earth from:Not learned 85. When using with any solvent, cleaner, chemical or refrigerant, you should review:Not learned 86. An award of up to what amount may be paid to a person supplying information that leads to a penalty against a technician who is intentionally venting?Not learned 87. The Montreal Protocol is:Not learned 88. What is one of the most serious results of damage to the ozone layer?Not learned 89. Of the refrigerants listed below, which has the lowest ozone depletion potential?Not learned 90. To determine the maximum allowable pressure to use when checking a system, check:Not learned 91. Ozone depletion potential, or "ODP," is:Not learned 92. An example of an HFC refrigerant is:Not learned 93. Whenever dry nitrogen from a portable cylinder is connected to a system, what item is of most importance in consideration of safety?Not learned 94. During servicing of a refrigeration system containing R-12, the refrigerant must be:Not learned 95. Which safety precaution(s) should always be followed:Not learned 96. In a vapor compression refrigeration system, cooling occurs when:Not learned 97. The evacuation of a system is a method of:Not learned 98. Each chlorine atom in the stratosphere can destroy ____ ozone molecules.Not learned 99. An example of a HFC refrigerant is:Not learned 100. Which gas(es) would cause the LEAST damage to the environment during a leak check?Not learned 101. Refrigerant migrates to the compressor crankcase because of a difference in __________ between the refrigerant and the oil.Not learned 102. It is important not to mix R-22 and R-410A refrigerants in the same container because:Not learned 103. When using recovery unit, the fill level of the recovery tank can be controlled by:Not learned 104. Which of the following refrigerant releases is a violation of the EPA prohibition on venting?Not learned 105. Which of the following human health effects could result from an increase in ultraviolet radiation?Not learned 106. Never use an open flame to heat a refrigerant tank because:Not learned 107. When transporting cylinders containing used refrigerant, the DOT requires that you:Not learned 108. According to ASHRAE's 1992 refrigerant safety classification, which of the following designations would be the most safe?Not learned 109. The over-evacuation of a system:Not learned 110. Equipment covered by EPA regulations include:Not learned 111. Never overfill refrigerant storage cylinders because:Not learned 112. It is important not to mix different refrigerants in the same container because:Not learned 113. Manifold gauge sets are often color coded, when this is done, the low pressure gauge is color coded:Not learned 114. All devices used for refrigerant recovery must:Not learned 115. Reusable refrigerant containers that are normally under any pressure above 15 psig, must be hydrostatically tested and date stamped every:Not learned 116. Which refrigerant(s) must be recovered before opening a system or disposing of a system?Not learned 117. To obtain an accurate vacuum readings during system evacuation, the system vacuum gauge should be located:Not learned 118. What is the best proof that CFCs are in the stratosphere?Not learned 119. The recovery of refrigerants is necessary to:Not learned 120. A compound pressure gauge, typically used on the low side of the system, measures pressure in:Not learned 121. _____________ refers to the process of cleaning refrigerant by oil separation and single or multiple passes through filter-driers, which reduce moisture and acidity?Not learned 122. The high pressure gauge on service manifold sets has a continuous scale, usually calibrated to read from:Not learned 123. ________ is the process that returns refrigerant to new-product specifications and that requires chemical analysis?Not learned 124. A cylinder with a gray body and a yellow top indicates that the cylinder is designed to hold:Not learned 125. HCFC refrigerants:Not learned 126. Which type of refrigerant is the most harmful to stratospheric ozone?Not learned 127. According to the EPA, a _________ leak detection methods is considered to be the most effective for locating the general area of a small leak.Not learned 128. Long hoses between the unit and the recovery machine should not be used because they cause:Not learned 129. Recovery equipment that relies upon the compressor in the system would be considered:Not learned 130. A hermetic compressor must never be operated when:Not learned 131. Self-contained recovery devices:Not learned 132. Systems charged with R-410A should be leak checked with:Not learned 133. R-410A is not a typical blended refrigerant because:Not learned 134. A ternary refrigerant blend is a ____ part mixture.Not learned 135. In a refrigeration system, high pressure vapor is converted to high pressure liquid in the:Not learned 136. Which of the following is an approved "drop-in" service replacement for R-12?Not learned 137. The proper method of discarding a disposable refrigerant cylinder is to:Not learned 138. CFC refrigerants are so named because they contain the elements:Not learned 139. Before you dispose of any system containing a refrigerant, you must:Not learned 140. According to EPA regulations, which of the following is procedures is not an approved technique for system cleanup after a burnout?Not learned 141. When using nitrogen to pressurize a system, you should always:Not learned 142. What effects can ozone depletion have on the environment?Not learned 143. Non-Azeotropic refrigerants leak from a system:Not learned 144. An example of an HCFC refrigerant is:Not learned 145. Which chemicals are controlled by the Montreal Protocol?Not learned 146. Systems charged with R-134a should be leak checked with:Not learned 147. When evacuating a system, the hoses should be:Not learned 148. It has been illegal to vent substitutes for CFC and HCFC refrigerants since:Not learned 149. Never use oxygen or compressed air to pressurize a system because:Not learned 150. Refrigerant cylinders should always be:Not learned 151. Even though R-22 is considered non-toxic, it:Not learned 152. A system is dehydrated to:Not learned 153. According to the EPA, of the refrigerants listed below, which types of refrigerants will not contribute to Global Warming?Not learned 154. The type of oil that is most commonly used in stationary air conditioning applications with HFC-410A refrigerant is:Not learned 155. Technicians receiving a passing grade on the Type II (medium-pressure, high-pressure and very high pressure) exam are certified to recover refrigerant during the maintenance, service, or repair of medium- and high-pressure equipment and very high pressure refrigerants, including:Not learned 156. Personal protective equipment (gloves, safety glasses, safety shoes, etc.) should always be worn is when:Not learned 157. Refrigerant vapors or mist should not be inhaled because:Not learned 158. Of the items listed below, which is (are) violation(s) of the Clean Air Act?Not learned 159. HFC refrigerants contain:Not learned 160. Which refrigerant contains an HCFC?Not learned 161. Recovery equipment that relies upon the pressure of the refrigerant in the appliance would be considered:Not learned 162. Refrigerant that enters the compressor, under normal operating conditions, is a:Not learned 163. It is necessary to place a refrigerant label on:Not learned 164. Which refrigerant contains a CFC?Not learned 165. Use __________ to remove ice from a sight glass.Not learned 166. According to the EPA, an oil sample should be taken for which of the following reasons?Not learned 167. The EPA requires the installation of a service aperture or process stub on all appliances using a class I or class II substance as a refrigerant. The main purpose of this requirement is to make it easier to:Not learned 168. Recycling and recovery equipment intended for use with air-conditioning and refrigeration equipment (except for small appliances) must be tested under:Not learned 169. Refrigerant entering the compressor of a refrigeration system is a:Not learned 170. What is being done in the U.S. to stop damage to the stratospheric ozone layer?Not learned 171. The type of oil that is most commonly used in stationary refrigeration applications with HFC-134a refrigerant is:Not learned 172. The term used to describe the fact that a refrigerant blend has a range of boiling or condensing points at a constant pressure is:Not learned 173. Under EPA's regulations, what standard must reclaimed refrigerant meet before it can be resold?Not learned 174. It is illegal to:Not learned 175. Refrigerant that enters the expansion or throttling device (also known as the metering device)is a:Not learned 176. Which of the following statements would be considered good service practices for conserving refrigerant?Not learned 177. Under the EPA "safe disposal requirements", the person responsible for making sure that the refrigerant has been removed from household refrigerators before they are disposed of is the:Not learned 178. Which refrigerant listed below is a "low-pressure refrigerant" under EPA's refrigerant recycling regulations?Not learned 179. When moisture exists in an operating system, which of the following is the most likely to occur?Not learned 180. Which of the following is a "very high-pressure refrigerant" under EPA's refrigerant recycling regulations?Not learned 181. When using nitrogen to pressurize a system, you should:Not learned 182. We dealing with small systems, how many different refrigerants may be recovered into the same cylinder?Not learned 183. When operating refrigerant recovery or recycling equipment, the following precautions should always be followed.Not learned 184. Of the refrigerants listed below, which types of refrigerants will not damage stratospheric ozone?Not learned 185. Refrigerant leaves the condenser of an operating system as a:Not learned 186. If corrosion is found within the body of a relief valve, the valve must be:Not learned 187. The Clean Air Act:Not learned 188. Measuring the system's final vacuum is always done with:Not learned 189. A refillable refrigerant cylinder must never be filled to more than ________ of its capacity by weight:Not learned 190. Of the refrigerants listed below, which refrigerant type have the highest ozone depletion potential?Not learned 191. This chemical was found in the upper stratosphere and that indicates that the ozone layer is being destroyed.Not learned 192. What factor(s) affects the speed of evacuation?Not learned 193. HCFC refrigerants contain:Not learned 194. When a system will not hold a vacuum after it has been evacuated, then:Not learned 195. All recovery equipment currently being made is required to have:Not learned 196. The color code for approved refrigerant recovery cylinders is ____________.Not learned 197. When can you use a disposable cylinder to recover refrigerant?Not learned 198. Which of the following is a "high-pressure refrigerant" under EPA's refrigerant recycling regulations?Not learned 199. After refrigerant liquid transfer between recovery unit and the system being emptied, you need to avoid trapping:Not learned 200. You can determine safe pressure for leak testing a system from the:Not learned 201. If a technician has a system where some R-502 was added to an R-22 system. The technician should:Not learned 202. Ozone in the stratosphere above the earth consists of:Not learned 203. The size (capacity) of the vacuum pump and the size of the suction line used will determine:Not learned 204. According to the EPA, when dealing with customer complaints regarding additional costs due to refrigerant recovery efforts, the technician should:Not learned 205. State and local governments can make state laws that:Not learned 206. If an oil is hygroscopic it means that it:Not learned 207. When dehydrating a system, the system can be heated to:Not learned 208. The synthetic lubricant presently used with ternary blends containing HCFCs is:Not learned 209. Ozone depletion in the stratosphere is what type of problem?Not learned 210. On a typical three port (three hose) manifold gauge, the center port is used for:Not learned 211. Ester based oils can be mixed with:Not learned 212. CFCs will no longer be manufactured or imported into the United States after:Not learned 213. Which type of refrigerants are chlorine-free?Not learned 214. Refrigerant recovery during low ambient temperatures will:Not learned 215. ________ is the process of removing refrigerant in any condition from a system and storing it in an external container without necessarily testing or processing it in any way.Not learned 216. Containers designated "refillable" by DOT are used for transporting recovered pressurized refrigerant _________.Not learned 217. Which refrigerant is an HCFC?Not learned 218. Which refrigerant is an HCFC?Not learned 219. An example of an HFC refrigerant is:Not learned 220. Which refrigerant contains a CFC?Not learned 221. An example of a HFC refrigerant is:Not learned 222. Which type of refrigerant is the most harmful to stratospheric ozone?Not learned 223. Of the refrigerants listed below, which has the lowest ozone depletion potential?Not learned 224. When evacuating a system, the hoses should be:Not learned