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