EPA Certification Exam -with 100% verified solutions- 2024-2025.docx, Exams of Advanced Education

Download EPA Certification Exam -with 100% verified solutions- 2024-2025.docx and more Exams Advanced Education 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: Total volume of the system Amount of non-condensibles (moisture) in the system Ambient Temperature A system that fails to hold a vacuum after the evacuation process: May contain moisture May have a leak To recover refrigerant is 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 Universal The required aperture typically found on small appliance systems is: The process stub Packaged terminal heat pumps with less than Five (5) pounds of refrigerants must be serviced by certified: Technicians with Type 1 Which refrigerants have a "0" ODP HFC's Disposable refrigerants cylinders should be disposed of by: Rendering useless and sent to salvage Which refrigerant is a strong candidate for replacing CFC (R-12) in small appliances? R-134a Which refrigerant can be used for leak detection as a trace gas and pressurized with nitrogen? R-22 Traces oil around the sight glass inlet fitting of refrigeration system might be the indication of: A leak A condition of excessive superheat at the evaporator outlet and compressor inlet of an air conditioning system could be an indication of: Low on refrigerant charge Type 2 classification, as identified by EPA, applies to what equipment? Split air conditioning equipment with five (5) pounds of refrigerant and greater Front seating the three-way valve suction valve will close the: Valve port to compressor 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: 0 inches Hg 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: 0 inches Hg 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 short term replacement refrigerant for R-11 chillers is R-123 Water tube leaks in a low pressure chiller are usually found with: A hydrostatic tube test The required evacuation level for recovering refrigerant from low pressure appliance with recovery machine manufactured BEFORE November 15, 1993 is: 25 inches Hg 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 A low pressure chiller generally has the rupture disk set at: 15 psig To prevent freezing of the water coils of a low pressure chiller, it is recommended that: when charging, begin with vapor phase Circulate water through the chiller Do not inject liquid during charging until saturation temperature is above 32 degrees A low pressure chiller providing comfort cooling that has an annual leak rate of % of the total charge, must be repaired: 15% 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