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100 True/False questions

  1. The sale of Class 1 and Class 2 refrigerants will be restricted to technicians certified by an EPA approved program after:November 14, 1994

          

  2. Which refrigerants have a "0" ODPR-134a

          

  3. If excessive nitrogen pressure is exerted within a low pressure chiller, what component would fail:when charging, begin with vapor phase
    Circulate water through the chiller
    Do not inject liquid during charging until saturation temperature is above 32 degrees

          

  4. Which refrigerant contains no chlorine?R-134a

          

  5. Water tube leaks in a low pressure chiller are usually found with:A hydrostatic tube test

          

  6. Type 3 certification as classified by EPA is for:Low pressure applications

          

  7. Line tapping and piercing valves should always be removed from systems after repairs are completed because:Pressure regulator

          

  8. CFC's will not be manufactured in the united states after:they operate below atmospheric pressure
    they draw non-condesibles through gaskets and seals

          

  9. Before disposing of a small appliance containing R-12, it is necessary to:Recover the refrigerant

          

  10. Under ASHRAE standard 15, the following refrigerations require equipment room oxygen deprivation sensors:R-11
    R-12
    R-134a

          

  11. The Gas in the stratosphere that protects us from ultraviolet radiation is:Ozone

          

  12. Non-condensibles in an air conditioning or refrigeration system will:Tend to stay in the top of the condenser
    Increase the high side pressure
    Be purged with a recovery machine

          

  13. Which of the following refrigerants can be mixed
    R-12 and R-134a
    R-12 and R-11
    R-22 and R-502
    They are heavier than air and displace oxygen

          

  14. The following actions would violate the clean air act (CAA):Knowingly releasing Class 1 Class 2 substances
    failing to keep or falsifying required records
    failing to tech the required evacuation levels before opening a systems to the atmosphere for service

          

  15. For small appliances use, the recovery equipment manufactured after November 15, 1993, must be capable of recovery:80% of the refrigerant when the compressor is not operating or achieve a 4-inch vacuum under ARI 740-1993

    90% of the refrigerant when the compressor is operating or achieve a 4-inch vacuum under ARI 740-1993

          

  16. Containers of refrigerant R-134a are cooler coded:Light Blue

          

  17. Recovery machines using water as the conducing medium would generally use the:Subcooled liquid

          

  18. The required aperture typically found on small appliance systems is:The process stub

          

  19. A system has been operating with a complete restriction at the capillary tube inlet, what access is required for recovery?One access valve on the high side of the system

          

  20. The required level of evacuation for recovery equipment manufactured before November 15 1993, on a system containing less than 200 pounds of R-22 refrigerant is:10 inches Hg

          

  21. System dependent recovery equipment is limited o appliances containing less then ____ pounds of refrigerant:Do not require an operating compressor
    requires 80% of the refrigerant to be recovered
    Recovers refrigerant in a non-pressurized container

          

  22. the condition an state of refrigerant leaving the accumulator of a system is:Superheated low pressure vapor

          

  23. Mixed refrigerants that are sent to reclaim centers:Will be disposed of at the owner's expense

          

  24. Low pressure chillers require purge units because:15 psig

          

  25. The refrigerant condition and state entering the condenser of an air conditioner is a:Subcooled liquid

          

  26. The required evacuation level for recovering refrigerant from low pressure appliance with recovery machine manufactured BEFORE November 15, 1993 is:R-11

          

  27. Which refrigerant can be used for leak detection as a trace gas and pressurized with nitrogen?R-11

          

  28. Recovery time can be shortened by:Recovery as much liquid as possible in he initial liquid line
    using short hoses
    cooling the recovery tank in ice water

          

  29. the refrigeration you would expect to find in a split air conditioning system manufactured before 1995 would be:R-22

          

  30. Which best describes the definition of Type 1 "small appliance" as defined by EPA?Systems manufactured, charged and hermetically sealed with five (5) pounds or less of refrigerant

          

  31. Which Refrigerants contain the most chlorine?R-134a

          

  32. The condition and state entering the condenser of an air conditioner is a:Subcooled liquid

          

  33. Type 2 classification, as identified by EPA, applies to what equipment?Compressor or the Evaporator

          

  34. Hydrochloric and hydrofluoric acids are:Recovery as much liquid as possible in he initial liquid line
    using short hoses
    cooling the recovery tank in ice water

          

  35. the rupture disk of a low pressure chiller is connected to the:A hydrostatic tube test

          

  36. Which refrigerant is an HFC?R-134a

          

  37. the generally accepted rule for maximum filling of cylinders is:80%

          

  38. Refrigerant vapor is charged into a low pressure chiller initially to prevent:water freeze up caused by system vacuum

          

  39. R-11 and R-123 refrigerants are:R-134a

          

  40. Stratospheric ozone depletion is a _________ problem:Caused from CFC's or HCFC's in ht presence of moisture being exposed to high heat
    Damaging to the windings found in hermetic refrigeration and air conditioning systems
    To be avoided when handling with bare hands

          

  41. the condition and state of refrigerant entering the receiver is:Subcooled liquid

          

  42. Under ASHRAE standard 15, what refrigerant requires equipment room seniors?R-123

          

  43. Nitrogen used for brazing processes, holding charges, or leak checkingR-123

          

  44. For the maintenance, service or repair of small appliances, recovery equipment manufactured after ________ must be certified by an EPA approved organization?November 15, 1993

          

  45. frost would be best removed from a sight glass by:Remove refrigerant is any condition from a system in either an active or passive manner, and store it in an external container without necessarily testing or processing.

          

  46. Machine room safety standards have been established by:top of the condesor

          

  47. A major repair is defined by EPA, as replacing the:Caused from CFC's or HCFC's in ht presence of moisture being exposed to high heat
    Damaging to the windings found in hermetic refrigeration and air conditioning systems
    To be avoided when handling with bare hands

          

  48. Disposable refrigerants cylinders should be disposed of by:Virgin refrigerant

          

  49. The molecule found in CFC's and HCHC's refrigerants that destroys the ozone in the stratosphere is:Chlorine

          

  50. A condition of excessive superheat at the evaporator outlet and compressor inlet of an air conditioning system could be an indication of:Check the name plate data

          

  51. R-134a us classified as a _____ under ASHRAE 34 standard safety group:A1

          

  52. Stratospheric ozone consists of:Three oxygen atoms

          

  53. Which Refrigerants have the lowest zone depletion potential?Will be disposed of at the owner's expense

          

  54. it becomes the owners responsibility to maintain records of all refrigerant added to unit that contain more thanks ___ pounds of refrigerant charged50 pounds

          

  55. R-123 is classified as a ____ under ASHRAE standard safety group:B-1

          

  56. The release of vapor from the top of a graduated charging cylinder, when filling, should:Not be vented and should be recoverd

          

  57. The required evacuation level for recovering refrigerant from a low pressure appliance with a recovery machine manufactured AFTER November 15, 1993 is:25 mm Hg absolute

          

  58. R-134a is a drop on replacement refrigerating for:R-123

          

  59. The process that reduces contaminate in used refrigerant by oil separation with single and multiple passes through devices such as replaceable filter core driers, which reduces moisture, acidity, and particulate matter is:R-123

          

  60. Comfort cooling chillers and all other equipment with an annual leak rate of ___% requires repair under EPA regulations:15%

          

  61. Which refrigerant is an HCFC?R-123 & R-22

          

  62. To work on small appliances after November 14, 1993, a technician must be certified as:It will be the technicians responsibility to learn and comply with future changes in the law

          

  63. Refrigerant cylinders should be shippedIn the vertical upright position

          

  64. Should regulation of the clean air act (CAA) change after a technicians certified:Will be disposed of at the owner's expense

          

  65. Traces oil around the sight glass inlet fitting of refrigeration system might be the indication of:Check the name plate data

          

  66. One of the easiest ways to identify the type of refrigerant in a system is to:Virgin refrigerant

          

  67. R-134a is "drop-in" refrigerant for:R-134a is not a Drop-in refrigerant

          

  68. A low pressure chiller providing comfort cooling that has an annual leak rate of ___ % of the total charge, must be repaired:35%

          

  69. exceptions to the required levels for recovery equipment that require an appliance be evacuated to only 0 psig apply to applications that:25 inches Hg

          

  70. The synthetic lubricant used with HCFC-based ternary blends is:Alkyl benzene

          

  71. The rule of thumb for refilling approved cylinders is a maximum of _____ percent liquid?Virgin refrigerant

          

  72. A nitrogen tank should always be equipped with a:Pressure regulator

          

  73. Recovery cylinders are color coded:Remove refrigerant is any condition from a system in either an active or passive manner, and store it in an external container without necessarily testing or processing.

          

  74. To prevent freezing of the water coils of a low pressure chiller, it is recommended that:Low side

          

  75. deep vacuums used for evacuation and dehydration of systems are measured in:Microns

          

  76. The short term replacement refrigerant for R-11 chillers isR-123

          

  77. Which refrigerant is a strong candidate for replacing CFC (R-12) in small appliances?R-134a

          

  78. Packaged terminal heat pumps with less than Five (5) pounds of refrigerants must be serviced by certified:Technicians with Type 1

          

  79. The required level of evacuation for recovery equipment manufactured after November 15, 1993 on a system containing less tan 200 pounds of R-12 refrigerant is:0 inches Hg

          

  80. Which refrigerant is a CFC and has been used with low pressure appliances?R-11

          

  81. The maximum pressure that should be applied to a low pressure chiller leak checking with controlled nitrogen is:10 psig

          

  82. At room ambient temperature of 80 degrees F, the pressure of a cylinder containing R-22 will be143 psig

          

  83. Which refrigerant is a CFC?R-134a

          

  84. Before a low pressure appliance is dismantled and salvaged:The refrigerant must be recovered

          

  85. The time it takes to properly evacuate and dehydrate a system prior to charging with refrigerant is determined by the:R-123

          

  86. the purge unit draws from the:R-12

          

  87. To recover refrigerant is to:Remove refrigerant is any condition from a system in either an active or passive manner, and store it in an external container without necessarily testing or processing.

          

  88. The component of an air conditioning system that changes a low pressure vapor to a high pressure vapor is the:Compressor

          

  89. Industrial process and commercial refrigeration equipment with an annual leak rate of ___ % requires repairs under EPA regulations:15%

          

  90. Front seating the three-way valve suction valve will close the:Valve port to compressor

          

  91. the required level of evacuation for recovery equipment manufactured before November 15, 1993, on a system with an R-22 charge of less than 200 pounds is:10 inches Hg

          

  92. the majority of the liquid to be recovered from a system will be found in the:Receiver (when applied)

          

  93. A low pressure chiller generally has the rupture disk set at:15 psig

          

  94. The Molecule found in the stratosphere that indicates stratospheric ozone depletion is taking place is:Subcooled liquid

          

  95. A system that fails to hold a vacuum after the evacuation process:May contain moisture
    May have a leak

          

  96. The Law states that leaks in small appliances:Do not have to be repaired, but should be repaired

          

  97. System dependent (passive) refrigerant recovery of small appliances:Virgin refrigerant

          

  98. As of what date did it become unlawful to intentionally release Class 1 and Class 2 refrigerants to the atmosphere?July 1, 1992

          

  99. One time (disposable) refrigerant cylinders are used for:Rendering useless and sent to salvage

          

  100. CFC an HCFC refrigerants can cause suffocation becauseR-134a