EPA 608 CORE TEST EXAM|| LATEST 2024-2025 QUESTIONS AND 100% CORRECT ANSWERS ALREADY GRA, Exams of Nursing

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EPA 608 CORE TEST EXAM|| LATEST 2024- 2025

QUESTIONS AND 100% CORRECT ANSWERS

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As of what date did it become unlawful to release Class 1 and Class II refrigerants to the atmosphere? a. July 1, 1992 b. July 1, 1993 c. November 14, 1994 d. January 1, 1996 - √ - ANSWER: a. July 1, 1992 Quiz :What is the ozone layer and why is it important to us on Earth? a. Thin layer of R-22 in the atmosphere that filters UV. b. Protective shield for Earth from the sun's harmful ultraviolent (UV) rays in the stratosphere layer that extends about 6 to 30 miles above earth c. Thin layer of CFC and HCFC in the atmosphere that filters UV. d. Protective layer that shields UV in the Troposphere - √ - ANSWER: b. Protective shield for Earth from the sun's harmful ultraviolent (UV) rays in the stratosphere layer that extends about 6 to 30 miles above earth Quiz :The atom found in CFC and HCFC refrigerants that destroys ozone in the stratosphere is? a. Fluorine

b. Carbon c. Hydrogen d. Chlorine - √ - ANSWER: d. Chlorine Quiz :What is an ozone molecule made of? a. Refrigerant b. Ammonia c. Three oxygen atoms (O3). d. Oxygen and ammonia. - √ - ANSWER: Three oxygen atoms (O3). Quiz :Which refrigerant is a CFC? a. R-134A b. R- 123 c. R- 22 d. R- 12 - √ - ANSWER: d. R- 12 Quiz :What is the name of the atom that attacks ozone molecules? a. CFC atoms b. HCFC atoms c. Chlorine and bromine atoms emitted into the atmosphere d. a and b - √ - ANSWER: c. Chlorine and bromine atoms emitted into the atmosphere Quiz :Which refrigerant is a HFC? a. R-134A

b. R- 123 c. R- 22 d. R- 12 - √ - ANSWER: a. R-134A Quiz :Describe how one Chlorine atom can destroy 100,000 ozone molecules. a. Chlorine releases one of the oxygen atoms and forms two O2 oxygen molecules, leaving the chlorine molecule free to attack another ozone molecule and repeat the process. b. Chlorine locks up the ozone molecule and then and then goes after another. c. Chlorine converts the ozone to bromine and then attacks more ozone molecules. d. Chlorine can bleach 100,000 ozone molecules before it weakens. - √ - ANSWER: a. Chlorine releases one of the oxygen atoms and forms two O oxygen molecules, leaving the chlorine molecule free to attack another ozone molecule and repeat the process. Quiz :Which refrigerant contains no chlorine? a. R-134A b. R- 123 c. R- 22 d. R- 12 - √ - ANSWER: a. R-134A Quiz :Name the refrigerant types that belong to CFCs, HCFCs and HFCs a. CFC R-11, R-12, R- 500

b. HCFC R-22, R- 123 c. HFC R-134a d. All of the above are correct - √ - ANSWER: d. All of the above are correct Quiz :The rule of thumb for refilling approved cylinders is a maximum of ___ percent liquid? a. 60% b. 79% c. 80% d. 90% - √ - ANSWER: c. 80% Quiz :What do the letters in "HCFC" stand for? a. High Carbon Fluorine Chlorine b. hydrochlorofluorocarbons c. Harmful Carbon Fluorine Chlorine d. highchlorinefluorocarbon - √ - ANSWER: b. hydrochlorofluorocarbons Quiz :To recover refrigerant is to? a. Remove a refrigerant in any condition from a system in either an active or passive manner, and store it in an external container without necessarily testing or processing b. Reduce contaminants in used refrigerant by oil separation through filter dryers. c. Reprocess refrigerant to new product specifications

d. Remove refrigerant and change ownership. - √ - ANSWER: a. Remove a refrigerant in any condition from a system in either an active or passive manner, and store it in an external container without necessarily testing or processing Quiz :What is ODP? a. Oxygen Destruction Properties b. Ozone Depletion Potential c. Ozone Destruction Properties d. Oxygen Depletion Potential - √ - ANSWER: b. Ozone Depletion Potential Quiz :R-134A is a "drop in" refrigerant for? 36 | P a g e a. R- 12 b. R- 22 c. R- 11 d. R-134A is not a drop-in refrigerant - √ - ANSWER: d. R-134A is not a drop-in refrigerant Quiz :Name some of the health and environmental effects of ozone depletion. a. Increased Temperature of the Earth b. Increased Cases of Skin Cancer c. Increased numbers of Cataracts in the eyes d. All the above - √ - ANSWER: d. All the above

Quiz :The condition and state of the refrigerant leaving a receiver is? a. Subcooled liquid b. Subcooled vapor c. Superheated vapor d. Superheated liquid. - √ - ANSWER: a. Subcooled liquid Quiz :What evidence do we have that CFCs and HCFCs are depleting the ozone? a. The rise in the amount of chlorine measured in the stratosphere over the past two decades matches the rise in the amount of fluorine. b. The rise in the amount of chlorine measured in the stratosphere over the past two decades matches the rise in CFC emissions over the same period. c. Samples of air taken from the stratosphere over erupting volcanoes show that volcanoes contribute a small quantity of chlorine to the stratosphere compared to CFCs. d. All the above - √ - ANSWER: d. All the above Quiz :The component of an air conditioning system that changes a low pressure vapor to a high pressure vapor is the? a. Condenser b. Metering device c. Evaporator d. Compressor 20.What characteristics - √ - ANSWER: d. Compressor Quiz :What characteristics make it easy for CFCs to reach the stratosphere and how do they get there?

a. CFCs are lighter than air atoms and rise into the Stratosphere. b. CFCs will not dissolve in water or break down into compounds that dissolve in water. Wind moves them into the Stratosphere c. Heating of the CFCs makes them lighter than air. d. a and c - √ - ANSWER: b. CFCs will not dissolve in water or break down into compounds that dissolve in water. Wind moves them into the Stratosphere Quiz :Why do we now use R-134a refrigerant? a. It costs less b. HFCs do not contain any chlorine c. It is a drop in replacement for R- 22 d. It is a drop in replacement for R- 11 - √ - ANSWER: b. HFCs do not contain any chlorine Quiz :What is the purpose of the CAA? 37 | P a g e a. Regulate California Air quality b. Clean the air in the US c. Limit how much of a pollutant can be in the air in the US - √ - ANSWER: c. Limit how much of a pollutant can be in the air in the US Quiz :What three things is the CAA doing to control chlorofluorocarbon emissions? a. Set dates to phase out CFC's and HCFC's b. Prohibit venting of CFC and HCFC

c. Require the EPA to set standards for recovery of refrigerants prior to appliance disposal d. All the above - √ - ANSWER: d. All the above Quiz :What can states do in addition to the CAA? a. Enforce standards more strict than the CAA laws b. Nothing c. States can create their own laws. d. All of the above - √ - ANSWER: a. Enforce standards more strict than the CAA laws Quiz :What three things can happen if you violate the CAA? a. Fine up to $27,500 per day, per violation b. May lose your certification to handle refrigerants c. May need to appear in US Federal Court for the charges d. All the above - √ - ANSWER: d. All the above Quiz :What incentive do others have to turn you in for violating the CAA? a. An award of up to $10,000 is offered by the EPA b. An award of up to $100,000 is offered by the EPA c. An award of up to $1,000 is offered by the EPA d. None of the above - √ - ANSWER: An award of up to $10,000 is offered by the EPA Quiz :Who can purchase refrigerants and what size cylinders can be purchased?

a. Only certified technicians may purchase refrigerants as of November 14, 1994 b. The smallest cylinder a 608 certified technician may purchase is 20 lbs c. A certified technician can purchase HCFC d. All the above - √ - ANSWER: Quiz :What is the Montreal Protocol? a. Treaty between Canada and the US to limit use of refrigerants b. Treaty among nations designed to protect the stratospheric ozone layer. c. Method to clean the air developed in Montreal d. Carbon regulation - √ - ANSWER: b. Treaty among nations designed to protect the stratospheric ozone layer. Quiz :What chemicals does the Montreal Protocol control? a. chlorofluorocarbons (CFCs), halons, b. carbon tetrachloride c. methyl chloroform d. All the above - √ - ANSWER: d. All the above Quiz :When was the CFC phase out date? a. November 31, 2003 b. December 31, 1995 c. November 15, 1990 d. November 15, 1993 - √ - ANSWER: b. December 31, 1995

Quiz :Where do CFC refrigerants come from for equipment servicing of older systems? a. DuPont b. Government warehouse

c. Recovery and recycling d. Imported from South America - √ - ANSWER: c. Recovery and recycling Quiz :What must be done before scrapping a refrigerant container? a. Release the refrigerant b. Recover to (0 psig) or lower and rendered useless c. Punch a hole in the container d. Add compressed air - √ - ANSWER: b. Recover to (0 psig) or lower and rendered useless Quiz :What must be done before disposing of an appliance containing CFCs or HCFCs? a. Identify refrigerant by attaching DOE tag. b. Identify refrigerant by attaching CAA tag c. Identify refrigerant by attaching EPA tag d. Refrigerant must be recovered - √ - ANSWER: d. Refrigerant must be recovered Quiz :Who is responsible for removing refrigerants from a system that is being disposed of? a. HVACR tech b. EPA c. Original owner d. Final person in the disposal chain - √ - ANSWER: d. Final person in the disposal chain

Quiz :Are there "drop-in" replacements for R-12 systems and if not, why? a. There is no "drop-in" replacement gas for R- 12 b. New refrigerants are incompatible with the oils and lubricants used in R- 12 c. 134A uses a different oil than R- 12 d. All the above - √ - ANSWER: d. All the above Quiz :What type of oil is used in R-134a and what oils will mix with it? a. Ester based oils b. Ester based oils do not mix with other oils. c. Synthetic alkylbenzene lubricant d. a and b - √ - ANSWER: d. a and b Quiz :Will the gases in a ternary blend leak at the same rate and why or why not? a. They leak at different rates because they retain their different vapor pressures. b. They leak at the same rate. A leak is a leak. c. Ternary blends have the same vapor pressure. d. All the above - √ - ANSWER: a. They leak at different rates because they retain their different vapor pressures. Quiz :What does a compressor compress? a. Liquid refrigerant b. Hot vapor c. High pressure vapor

d. Low pressure, low temperature vapor - √ - ANSWER: d. Low pressure, low temperature vapor Quiz :Explain how cooling of a space occurs in a refrigeration cycle a. The indoor air is cooled b. Heat is removed from inside the building and is deposited outside the building c. Liquid refrigerant absorbs the heat and transfers it to the exterior. d. Cold liquid refrigerant cools the indoor air. - √ - ANSWER: b. Heat is removed from inside the building and is deposited outside the building Quiz :Will refrigerant migrate to the crank case in a compressor? a. Refrigerant seeks the lowest point in the system, the compressor crankcase. b. Refrigerant vaporizes and does not collect tin the compressor. c. Oil migrates to the compressor crankcase. d. Refrigerant will migrate towards the compressor crank case while the oil will not - √ - ANSWER: d. Refrigerant will migrate towards the compressor crank case while the oil will not Quiz :What color is the compound gauge and what does the compound gauge measure? a. Blue and measures low pressure (psig) and vacuum (inches Hg) b. Red and measures head pressure c. Yellow and measures vacuum - √ - ANSWER: a. Blue and measures low pressure (psig) and vacuum (inches Hg)

Quiz :What color is the high pressure gauge? a. Blue and measures high pressure b. Red and measures the high side (discharge) pressure c. Red and measures low side pressure d. Yellow and measures high pressure - √ - ANSWER: b. Red and measures the high side (discharge) pressure Quiz :What are three things the center hose is used for and what color is it usually? a. Red, high pressure, low pressure and vacuum b. Yellow hose and can be connected to a recovery device, evacuation vacuum pump or charging device c. Blue, low pressure, vacuum and recovery d. Green, recovery, vacuum, low and high pressure - √ - ANSWER: b. Yellow hose and can be connected to a recovery device, evacuation vacuum pump or charging device Quiz :What things should you look for in equipment and systems to help limit refrigerant emissions? a. Equipment used is approved by the EPA b. Leak check, repairing leaks c. Making sure that all fittings are tight during service and recovery d. All the above - √ - ANSWER: d. All the above Quiz :What is the most effective method for checking for small leaks? a. Leak noise

b. Refrigerant dye c. Pressurize with nitrogen d. Halide torch - √ - ANSWER: d. Halide torch Quiz :How can you test a system for leaks? a. Evacuate the system and pull a vacuum on it b. Use a hydrostatic test c. Pressurize with oxygen d. Use water pressure - √ - ANSWER: a. Evacuate the system and pull a vacuum on it Quiz :What should you look for if a compressor burns out? a. Frayed wires b. Check paint on compressor body c. Strong smell in refrigerant d. Melted tubing - √ - ANSWER: c. Strong smell in refrigerant Quiz :What will need to happen if the oil has been contaminated by a burnout? a. Triple evacuate the system b. Install a permanent filter-drier c. Conduct a deep vacuum before recharging d. All the above - √ - ANSWER: d. All the above Quiz :How is recovery different from recycling? a. Recycle is to clean refrigerant for immediate reuse

b. Recover is to remove refrigerant in any condition from a system and store it in an external container c. There is no difference d. a and b - √ - ANSWER: d. a and b Quiz :How is recycling different from reclaiming? a. Recycling must be performed by a recycling plant b. Recycle is to clean c. Reclaim is to process refrigerant to the level of new product specifications d. b and c - √ - ANSWER: d. b and c Quiz :Name reasons recovery is important? a. To have adequate supplies of refrigerant for service after production bans b. Prevent venting to the atmosphere c. Prevent stratospheric ozone depletion d. All the above - √ - ANSWER: d. All the above Quiz :What standards must refrigerant recovery equipment meet? a. Certified and labeled by an EPA approved equipment manufacturer b. None c. CAA approval d. DOT standards and labeling - √ - ANSWER: a. Certified and labeled by an EPA approved Quiz :What are types of recovery equipment used? a. System dependent

b. Self-contained c. Container less d. a and b - √ - ANSWER: d. a and b Quiz :What should you tell a consumer who complains about the added cost and time of recovering refrigerant? a. Recovery is the law. b. Recovery is necessary to protect human health and the environment. c. All professional service personnel are duty bound to follow the law and protect the environment. d. All of the above - √ - ANSWER: d. All of the above Quiz :How should you handle recovery of a system that has mixed refrigerants? a. Recover into a separate tank b. Vent the refrigerant c. Call the EPA d. Call the police - √ - ANSWER: Quiz :After recovery, what are nitrogen and a filter drier used for? a. Dry the system. b. Filter dryer is used to clean the nitrogen before removal c. Flush debris and trap any debris d. All of the above - √ - ANSWER: a. Recover into a separate tank

Quiz :What are the variables that affect the recovery rate? a. Size of refrigeration system and recovery equipment b. Size of suction hose, c. Temperatures. d. All of the above - √ - ANSWER: c. Flush debris and trap any debris Quiz :Why is it important to have faster recovery? a. Taking longer increases chance of emissions of the refrigerants to the atmosphere b. Faster recovery saves energy c. Faster recovery removes oil d. All of the above - √ - ANSWER: a. Taking longer increases chance of emissions of the refrigerants to the atmosphere Quiz :If you smell a strong odor during recovery, what is most likely the problem? a. Compressor has burned out b. Sour gas c. Pressure is too high d. Recovery machine is overloaded - √ - ANSWER: a. Compressor has burned out Quiz :Why is it necessary to dehydrate a refrigeration system? a. Remove water from a hydrostatic pressure test b. Remove debris from the system c. Remove ice contaminates

d. Remove water and water vapor contaminating the system - √ - ANSWER: d. Remove water and water vapor contaminating the system Quiz :What happens if moisture is left in an operating refrigeration system? a. Freezes up b. Create highly corrosive and toxic acids c. Increases head pressure d. Reduces head pressure - √ - ANSWER: b. Create highly corrosive and toxic acids Quiz :What must be done before starting evacuation? a. Install nitrogen b. Install dryer c. Recover all refrigerant d. Install site glass - √ - ANSWER: c. Recover all refrigerant Quiz :What are the four factors that affect the evacuation time? a. Size of equipment being evacuated, b. Ambient temperature, Amount of moisture, c. Capacity of vacuum pump and suction line d. All of the above - √ - ANSWER: d. All of the above Quiz :Can you increase the temperature of a refrigeration system for evacuation and if so, what purpose does it have? a. Yes. Decrease the evacuation time by increasing pressure

b. No. It increases time by increasing pressure c. No. Creates danger of explosion d. None of the above - √ - ANSWER: a. Yes. Decrease the evacuation time by increasing pressure Quiz :How long and what diameter should the piping connection to the vacuum pump be? a. 3 feet and 3/8" b. 2.5 feet and 3/8" c. 2 feet and 3/8" d. As short in length as possible and as wide in diameter as possible - √ - ANSWER: d. As short in length as possible and as wide in diameter as possible Quiz :How big should the vacuum hoses be in relation to the pump intake connection? a. One size larger than pump intake connection b. Equal to or larger than the pump intake connection c. One and a half size larger than pump intake connection d. None of the above - √ - ANSWER: b. Equal to or larger than the pump intake connection Quiz :For accurate vacuum readings, where should the vacuum gauge be located? a. Close to the vacuum pump b. Between the vacuum pump and unit c. As far as possible from the vacuum pump

d. On the vacuum pump - √ - ANSWER: c. As far as possible from the vacuum pump Quiz :When should the measurement of vacuum for a system be done and how do we know when dehydration is complete? a. With the system isolated and vacuum pump turned on. Dehydration is considered complete when the vacuum gauge shows that have reached and held the required finished vacuum b. With the system open and vacuum pump turned off. Dehydration is considered complete when the vacuum gauge shows that have reached and held the required finished vacuum c. With the system isolated and vacuum pump turned off. Dehydration is considered complete when the vacuum gauge shows that have reached and held the required finished vacuum for one minute d. With the system isolated and vacuum pump turned off. Dehydration is considered complete when the vacuum gauge shows that have reached and held the required finished vacuum - √ - ANSWER: With the system isolated and vacuum pump turned off. Dehydration is considered complete when the vacuum gauge shows that have reached and held the required finished vacuum Quiz :What is the leading cause of refrigeration accidents leading to death? a. Phosgene gas inhalation b. Oxygen deprivation c. Freezing to death

d. Electrocution - √ - ANSWER: b. Oxygen deprivation Quiz :What personal protective equipment should you wear when handling refrigerants? a. Safety glasses b. Butyl-lined protective gloves c. Safety shoes d. All the above - √ - ANSWER: d. All the above Quiz :What are the risks of inhaling (breathing in) refrigerants? a. Refrigerants can be deadly if inhaled or allowed to be heated b. Refrigerants inert and harmless if inhaled c. Refrigerants are only dangerous if heated d. Refrigerants can be safe if heated - √ - ANSWER: a. Refrigerants can be deadly if inhaled or allowed to be heated Quiz :What are the requirements under ASHRAE standard 15-1994? a. Requires a refrigerant sensor that will sound an alarm and automatically start a ventilation system in occupied equipment rooms where refrigerant (regardless of refrigerant type) from a leak will concentrate. b. Requires a refrigerant sensor that will sound an alarm and automatically start a ventilation system in occupied equipment rooms where R-123 from a leak will concentrate

c. Requires a refrigerant sensor that will sound an alarm and automatically start a ventilation system in occupied equipment rooms where R-11 from a leak will concentrate d. Requires a refrigerant sensor that will sound an alarm and automatically start a ventilation system in occupied equipment rooms where R-12 from a leak will concentrate - √ - ANSWER: a. Requires a refrigerant sensor that will sound an alarm and automatically start a ventilation system in occupied equipment rooms where refrigerant (regardless of refrigerant type) from a leak will concentrate. Quiz :Under what conditions will alarm and ventilation sound under ASHRAE standard 15-1994? a. The alarm will sound before the TLV-TWA (Threshold Limit Value - Time weighted Average) is exceeded (oxygen deprivation level). b. The alarm will sound after the TLV-TWA (Threshold Limit Value - Time weighted Average) is exceeded (oxygen deprivation level). c. The alarm will sound before when any leak is detected d. The alarm will sound before when any leak in excess of 100 PPM is detected - √ - ANSWER: a. The alarm will sound before the TLV-TWA (Threshold Limit Value - Time weighted Average) is exceeded (oxygen deprivation level). Quiz :What is the safest rating of a refrigerant according to the ASHRAE scale? a. A-1 is considered the safest refrigerant while B-3 is the least safe

b. B-1 is considered the safest refrigerant while A-3 is the least safe c. B-3 is considered the safest refrigerant while A-1 is the least safe d. None of the above. - √ - ANSWER: a. A-1 is considered the safest refrigerant while B-3 is the least safe Quiz :Why should oxygen or compressed air never be used to test leak a system? a. Oxygen or compressed air, when mixed with refrigerants, can cause an explosion b. Oxygen or compressed air contain moisture and will contaminate the system c. Oxygen or compressed air can't be detected by leak checking tools d. None of the above - √ - ANSWER: a. Oxygen or compressed air, when mixed with refrigerants, can cause an explosion Quiz :When using nitrogen to charge a system, what piece of equipment should it be charged through and where should a relief valve be located? a. Charge through a refrigeration manifold with a relief valve on the nitrogen cylinder b. Charge through a pressure regulator (make sure the nitrogen cylinder has a regulator on it) and insert a relief valve downstream line from the pressure regulator c. Install a relief valve prior to the pressure regulator. d. None of the above - √ - ANSWER: b. Charge through a pressure regulator (make sure the nitrogen cylinder has a regulator on it) and insert a relief valve downstream line from the pressure regulator

Quiz :Where can you find the appropriate test pressures for a system? a. ARI directory b. Data plate on the low-side pressure valve c. Manufactures certified test data d. None of the above - √ - ANSWER: b. Data plate on the low-side pressure valve Quiz :What are the two conditions to be aware of in observing relief valves? a. NOT to be installed in series. b. Be replaced if corrosion build-up is found within the body of a relief valve. c. a and b d. None of the above - √ - ANSWER: c. a and b Quiz :What can happen to refrigerants if they are exposed to direct flame or other excessive heat? a. Change into toxic materials like phosgene gas b. Explode c. a and b d. All of the above - √ - ANSWER: a. Change into toxic materials like phosgene gas Quiz :Before welding, cutting or brazing a refrigerant line, what should be done? a. Read MSDS sheet b. Evacuate all refrigerant c. Run a constant flow of refrigerant through it while welding d. None of the above - √ - ANSWER: b. Evacuate all refrigerant