EPA Certification Exam-with 100% verified solutions 2024-2025, Exams of Nursing

Download EPA Certification Exam-with 100% verified solutions 2024-2025 and more Exams Nursing in PDF only on Docsity! EPA Certification Exam-with 100% verified solutions 2024-2025 Which Refrigerants contain the most chlorine? CFC's As of what date did it become unlawful to intentionally release Class 1 and Class 2 refrigerants to the atmosphere? July 1, 1992 Which Refrigerants have the lowest zone depletion potential? HFC's The molecule found in CFC's and HCHC's refrigerants that destroys the ozone in the stratosphere is: Chlorine Stratospheric ozone consists of: Three oxygen atoms Stratospheric ozone depletion is a _________ problem: Global The Gas in the stratosphere that protects us from ultraviolet radiation is: Ozone Which refrigerant is a CFC? R-12 Which refrigerant is an HCFC? R-123 & R-22 Which refrigerant is an HFC? R-134a Which refrigerant contains no chlorine? R-134a The Molecule found in the stratosphere that indicates stratospheric ozone depletion is taking place is: Chlorine monoxide 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 One time (disposable) refrigerant cylinders are used for: Virgin refrigerant The rule of thumb for refilling approved cylinders is a maximum of _____ percent liquid? 80% The time it takes to properly evacuate and dehydrate a system prior to charging with refrigerant is determined by the: 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 The sale of Class 1 and Class 2 refrigerants will be restricted to technicians certified by an EPA approved program after: November 14, 1994 The release of vapor from the top of a graduated charging cylinder, when filling, should: Not be vented and should be recoverd Should regulation of the clean air act (CAA) change after a technicians certified: It will be the technicians responsibility to learn and comply with future changes in the law Containers of refrigerant R-134a are cooler coded: Light Blue System dependent (passive) refrigerant recovery of small appliances: Do not require an operating compressor requires 80% of the refrigerant to be recovered Recovers refrigerant in a non-pressurized container Mixed refrigerants that are sent to reclaim centers: Will be disposed of at the owner's expense Before disposing of a small appliance containing R-12, it is necessary to: Recover the refrigerant Hydrochloric and hydrofluoric acids are: 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 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 Which of the following refrigerants can be mixed R-12 and R-134a R-12 and R-11 R-22 and R-502 None of the refrigerants can be mixed CFC an HCFC refrigerants can cause suffocation because They are heavier than air and displace oxygen A nitrogen tank should always be equipped with a: Pressure regulator Nitrogen used for brazing processes, holding charges, or leak checking May be vented tot he atmosphere Line tapping and piercing valves should always be removed from systems after repairs are completed because: The Neoprene gaskets will eventually fail causing a leak CFC's will not be manufactured in the united states after: 1995 The Law states that leaks in small appliances: Do not have to be repaired, but should be repaired To work on small appliances after November 14, 1993, a technician must be certified as: Type 1 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: 10 inches Hg Industrial process and commercial refrigeration equipment with an annual leak rate of ___ % requires repairs under EPA regulations: 35% Comfort cooling chillers and all other equipment with an annual leak rate of ___% requires repair under EPA regulations: 15% 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 the majority of the liquid to be recovered from a system will be found in the: Receiver (when applied) it becomes the owners responsibility to maintain records of all refrigerant added to unit that contain more thanks ___ pounds of refrigerant charged 50 pounds A major repair is defined by EPA, as replacing the: Compressor or the Evaporator exceptions to the required levels for recovery equipment that require an appliance be evacuated to only 0 psig apply to applications that: Are filled with water or substances that would damage the recovery equipment the generally accepted rule for maximum filling of cylinders is: 80% the refrigeration you would expect to find in a split air conditioning system manufactured before 1995 would be: R-22 System dependent recovery equipment is limited o appliances containing less then ____ pounds of refrigerant: 15 pounds the condition and state of refrigerant entering the receiver is: Subcooled high pressure liquid the condition an state of refrigerant leaving the accumulator of a system is: Superheated low pressure vapor deep vacuums used for evacuation and dehydration of systems are measured in: Microns 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 R-134a is a drop on replacement refrigerating for: it is not a drop in replacement One of the easiest ways to identify the type of refrigerant in a system is to: Check the name plate data At room ambient temperature of 80 degrees F, the pressure of a cylinder containing R-22 will be 143 psig Recovery machines using water as the conducing medium would generally use the: R-134a us classified as a _____ under ASHRAE 34 standard safety group: A1 R-123 is classified as a ____ under ASHRAE standard safety group: B-1 Under ASHRAE standard 15, what refrigerant requires equipment room seniors? R-123 Under ASHRAE standard 15, the following refrigerations require equipment room oxygen deprivation sensors: R-11 R-12 R-134a Low pressure chillers require purge units because: they operate below atmospheric pressure they draw non-condesibles through gaskets and seals the rupture disk of a low pressure chiller is connected to the: Low side the purge unit draws from the: top of the condesor Before a low pressure appliance is dismantled and salvaged: The refrigerant must be recovered Machine room safety standards have been established by: ASHRAE 15 Refrigerant vapor is charged into a low pressure chiller initially to prevent: water freeze up caused by system vacuum If excessive nitrogen pressure is exerted within a low pressure chiller, what component would fail: Rupture Disk R-11 and R-123 refrigerants are: Oxygen depleting Heavier than air Are class 1 and 2 substances as defined by the EPA