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

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EPA Certification Exam-with 100% verified solutions

2024-

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-

Which refrigerant is an HCFC? R-123 & R- 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: 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. 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: Recycling The synthetic lubricant used with HCFC-based ternary blends is: Alkyl benzene R-134a is "drop-in" refrigerant for: R-134a is not a Drop-in refrigerant

The refrigerant condition and state entering the condenser of an air conditioner is a: Superheated Vapor The condition and state entering the condenser of an air conditioner is a: Subcooled liquid The component of an air conditioning system that changes a low pressure vapor to a high pressure vapor is the: Compressor Refrigerant cylinders should be shipped In the vertical upright position For the maintenance, service or repair of small appliances, recovery equipment manufactured after ________ must be certified by an EPA approved organization? November 15, 1993 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

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- 90% of the refrigerant when the compressor is operating or achieve a 4- inch vacuum under ARI 740- 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- R-22 and R- 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-

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 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- 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:

Municipal water supply frost would be best removed from a sight glass by: Spraying with alcohol Recovery cylinders are color coded: Gray with yellow tops Which refrigerant is a CFC and has been used with low pressure appliances? R- Type 3 certification as classified by EPA is for: Low pressure applications The maximum pressure that should be applied to a low pressure chiller leak checking with controlled nitrogen is: 10 psig The short term replacement refrigerant for R-11 chillers is R- 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: A R-123 is classified as a ____ under ASHRAE standard safety group: B- Under ASHRAE standard 15, what refrigerant requires equipment room seniors? R- Under ASHRAE standard 15, the following refrigerations require equipment room oxygen deprivation sensors: R- R- 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