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EPA 608 Core Test Sample Questions
and Answers 2023
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 - Correct answer-a. July 1, 1992 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 - Correct 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 The atom found in CFC and HCFC refrigerants that destroys ozone in the stratosphere is? a. Fluorine b. Carbon c. Hydrogen d. Chlorine - Correct answer-d. Chlorine What is an ozone molecule made of? a. Refrigerant b. Ammonia c. Three oxygen atoms (O3). d. Oxygen and ammonia. - Correct answer-Three oxygen atoms (O3). Which refrigerant is a CFC? a. R-134A b. R- 123 c. R- 22 d. R- 12 - Correct answer-d. R- 12 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 - Correct answer-c. Chlorine and bromine atoms emitted into the atmosphere Which refrigerant is a HFC? a. R-134A b. R- 123 c. R- 22 d. R- 12 - Correct answer-a. R-134A 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. - Correct answer-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. Which refrigerant contains no chlorine? a. R-134A b. R- 123 c. R- 22 d. R- 12 - Correct answer-a. R-134A 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 - Correct answer-d. All of the above are correct The rule of thumb for refilling approved cylinders is a maximum of ___ percent liquid? a. 60% b. 79% c. 80% d. 90% - Correct answer-c. 80% What do the letters in "HCFC" stand for? a. High Carbon Fluorine Chlorine b. hydrochlorofluorocarbons c. Harmful Carbon Fluorine Chlorine d. highchlorinefluorocarbon - Correct answer-b. hydrochlorofluorocarbons
that volcanoes contribute a small quantity of chlorine to the stratosphere compared to CFCs. d. All the above - Correct answer-d. All the above 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 - Correct answer-d. Compressor 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 - Correct answer-b. CFCs will not dissolve in water or break down into compounds that dissolve in water. Wind moves them into the Stratosphere 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 - Correct answer-b. HFCs do not contain any chlorine 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 - Correct answer-c. Limit how much of a pollutant can be in the air in the US 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 - Correct answer-d. All the above 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 - Correct answer-a. Enforce standards more strict than the CAA laws 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 - Correct answer-d. All the above 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 - Correct answer-An award of up to $10,000 is offered by the EPA 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 - Correct answer- 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 - Correct answer-b. Treaty among nations designed to protect the stratospheric ozone layer. What chemicals does the Montreal Protocol control? a. chlorofluorocarbons (CFCs), halons, b. carbon tetrachloride c. methyl chloroform d. All the above - Correct answer-d. All the above When was the CFC phase out date? a. November 31, 2003 b. December 31, 1995 c. November 15, 1990 d. November 15, 1993 - Correct answer-b. December 31, 1995 Where do CFC refrigerants come from for equipment servicing of older systems? a. DuPont b. Government warehouse c. Recovery and recycling
b. Hot vapor c. High pressure vapor d. Low pressure, low temperature vapor - Correct answer-d. Low pressure, low temperature vapor 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. - Correct answer-b. Heat is removed from inside the building and is deposited outside the building 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 - Correct answer-d. Refrigerant will migrate towards the compressor crank case while the oil will not 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 - Correct answer-a. Blue and measures low pressure (psig) and vacuum (inches Hg) 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 - Correct answer-b. Red and measures the high side (discharge) pressure 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 - Correct answer-b. Yellow hose and can be connected to a recovery device, evacuation vacuum pump or charging device 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 - Correct answer-d. All the above What is the most effective method for checking for small leaks? a. Leak noise b. Refrigerant dye c. Pressurize with nitrogen d. Halide torch - Correct answer-d. Halide torch 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 - Correct answer-a. Evacuate the system and pull a vacuum on it 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 - Correct answer-c. Strong smell in refrigerant 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 - Correct answer-d. All the above 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 - Correct answer-d. a and b 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 - Correct answer-d. b and c 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 of the above - Correct answer-a. Taking longer increases chance of emissions of the refrigerants to the atmosphere 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 - Correct answer-a. Compressor has burned out 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 - Correct answer-d. Remove water and water vapor contaminating the system 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 - Correct answer-b. Create highly corrosive and toxic acids What must be done before starting evacuation? a. Install nitrogen b. Install dryer c. Recover all refrigerant d. Install site glass - Correct answer-c. Recover all refrigerant 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 - Correct answer-d. All of the above 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 - Correct answer-a. Yes. Decrease the evacuation time by increasing pressure 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 - Correct answer- d. As short in length as possible and as wide in diameter as possible 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 - Correct answer-b. Equal to or larger than the pump intake connection 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 - Correct answer-c. As far as possible from the vacuum pump 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 - Correct 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 What is the leading cause of refrigeration accidents leading to death? a. Phosgene gas inhalation b. Oxygen deprivation c. Freezing to death d. Electrocution - Correct answer-b. Oxygen deprivation What personal protective equipment should you wear when handling refrigerants? a. Safety glasses b. Butyl-lined protective gloves c. Safety shoes
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 - Correct answer-a. Oxygen or compressed air, when mixed with refrigerants, can cause an explosion 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 - Correct 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 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 - Correct answer-b. Data plate on the low-side pressure valve 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 - Correct answer-c. a and b 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 - Correct answer-a. Change into toxic materials like phosgene gas 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 - Correct answer-b. Evacuate all refrigerant In case of a major refrigerant leak, what actions should be taken? a. Stop the leak b. Close any valves c. Turn off any open flames d. Immediately vacate and ventilate the area or use Self Contained Breathing Apparatus (SCBA). - Correct answer-d. Immediately vacate and ventilate the area or use Self Contained Breathing Apparatus (SCBA). What types of cylinders can be used for recovery and how can you visually identify them? a. Nitrogen marked nitrogen b. Cylinders of the appropriate color for the refrigerant being used c. Cylinders marked "RECOVERY" d. Yellow tops and gray bodies - Correct answer-d. Yellow tops and gray bodies How often should refillable cylinders be hydrostatically tested? a. Every 5 years b. Every 3 years c. Every 2 years d. Every year - Correct answer-a. Every 5 years What must be done to a cylinder (disposable or refillable) before scrapping it? a. Mark the Cylinder "Not For Reuse" b. Completely evacuated of all refrigerants and have a pressure of 0 psig or lower c. Completely evacuated of all refrigerants and have a pressure of 10 psig or lower d. Completely evacuated of all refrigerants and have a pressure of 15 psig or lower - Correct answer-b. Completely evacuated of all refrigerants and have a pressure of 0 psig or lower Why shouldn't you fill cylinders above 80% of their capacity by weight? a. It takes too much time to top off the tank. b. Overfilled cylinders may rise in internal pressure when exposed to heat, resulting in an explosion c. a and b d. None of the above - Correct answer-b. Overfilled cylinders may rise in internal pressure when exposed to heat, resulting in an explosion What can happen if cylinders are exposed to flames or excessive heat? a. May cause the cylinder to explode b. It may change the state of the refrigerant into a toxic material c. The added pressure may cause the cylinder to leak refrigerant. d. All the above - Correct answer-d. All the above
fluorescent Indicator Electronic tester Ultrasonic tester All the options are correct - Correct answer-fluorescent Indicator If your recovery unit does not have a sub-cooling feature recovery rate will be _____ : Slower Recovery rate is independent Faster - Correct answer-Faster Lifetime of CFCs is believed to range from ______ : 100 to 500 years 20 to 100 years 5 to 10 years Above 1000 years - Correct answer-20 to 100 years Refrigerant cannot be called reclaimed unless it meets the ______ purity standard: ARI- 740 ARI- 360 ARI- 700 ARI- 1024 - Correct answer-ARI- 700 Which one of the following has higher Ozone Depletion Potential (ODP): HFC HCFC All options are correct CFC - Correct answer-CFC The ____connects the evaporator to the compressor in a refrigerant system: Discharge Line Liquid Line Suction Line Evaporation Line - Correct answer-Suction Line Halons were completely phased out by ______ : 2000 1987 1995 1994 - Correct answer- 1994 It is to be ensured that the refrigerant recovery cylinder is not filled to more than _____ of its capacity 80 percent 50 percent 60 percent 90 percent - Correct answer-80 percent
If it is filled beyond 80% during increase in temperature the refrigerant expands results in increase in pressure inside the cylinder which can lead to bursting of cylinder Which of the following substance present in refrigerant appliance results in corrosion: Acidic Can be either acidic and basic Basic - Correct answer-Acidic A recovery cylinder can maximum store _____ refrigerants: 3 2 1 4 - Correct answer- 1 One chlorine ion can able to destroy _______ ozone molecules: 100 10, 100, 1000 - Correct answer-100, During each vacuum decay test, it is observed that the system after creating the vacuum the pressure of the system increases greater than at 0 psig, Then: Leak is observed but not refrigerant is trapped Leak could not be observed None of the answers are correct The refrigerant could be trapped in the system - Correct answer-The refrigerant could be trapped in the system After recovering refrigerant from a sealed system, which of the following gas is used to pressurize (for leak checking) or blow debris out of the system: Oxygen Nitrogen gas Carbon dioxide Hydrogen - Correct answer-Nitrogen gas EPA has divided refrigerated appliances into _____ groups Four Five Six Three - Correct answer-Five Recovered refrigerant are stored in tanks are painted _____ : Yellow with blue tops
Nitrogen does not react with hydrogen Ammonia - Correct answer-Ammonia Which of the following is used to minimize the leakage of refrigerant while checking: Either can be used Self-sealing hoses Hand valves - Correct answer-Either can be used Ozone is a unstable molecule: True False - Correct answer-true Presence of which of the following element will reduce the stability of the Ozone Depletion Substances: All options are correct Bromine Chlorine Hydrogen - Correct answer-Hydrogen The color of low-pressure port of the manifold that is connected to the low side of the system Red Blue Green Yellow - Correct answer-Blue Which of the refrigerant is used in low pressure refrigerated appliance: R- 114 R- 12 R- 123 R- 500 - Correct answer-R- 123 This suction line filter drier should be located just upstream of the _____ inlet: Evaporator Condenser Compressor Expansion valve - Correct answer-Compressor If the vacuum pump used is too large, water removal will become:
Easier Remains same Difficult - Correct answer-Difficult As the pressure drops water cools down and freeze makes difficult to extract The ______ connects the condenser to the expansion device: Discharge line Suction line Liquid line Expansion line - Correct answer-Liquid line Recovery and recycling equipment intended for use manufactured after _____ must be certified to meet the requirements of ARI 740: Dec 31, 1994 Nov 15, 1993 Dec 31, 1995 Jan 1, 1995 - Correct answer-Nov 15, 1993 Which type of leak detector works by drawing the vapor into the system and heating it: Helium leak detector Electronic leak detector Ultrasonic leak tester Fluorescent leak detector - Correct answer-Electronic leak detector If the label identifying the refrigerant is missing, then which of the following method is used to identify the type of refrigerant: Density-Temperature method Pressure-Temperature method All the options are correct Density - Volume method - Correct answer-Pressure-Temperature method A vacuum test allows air and moisture to enter the system if there is a leak: True False - Correct answer-True Motor Vehicle Air Conditioning (MVAC) service technicians are governed under a _____ section: 607 608 609
