{"title":"EPA 608 Core Section Practice Exam","description":"The Core section is required for all EPA 608 applicants. It covers refrigerant chemistry, ozone depletion, the Clean Air Act, safety, and recovery fundamentals. Passing score: 70% (18 of 25 correct).","passing_score":70,"module_links":[{"url":"/pages/epa-608-module-1","text":"Module 1: Refrigerants and Ozone Layer"},{"url":"/pages/epa-608-module-2","text":"Module 2: Clean Air Act and Regulations"},{"url":"/pages/epa-608-module-3","text":"Module 3: Safety and Handling"},{"url":"/pages/epa-608-module-4","text":"Module 4: Recovery Procedures"}],"questions":[{"question":"EPA Section 608 of the Clean Air Act primarily regulates:","options":["Energy efficiency standards for new HVAC equipment","The purchase, use, and handling of refrigerants in stationary equipment","HVAC equipment installation and commissioning standards","Refrigerant manufacturing processes and labeling"],"correct":1,"explanation":"EPA Section 608 regulates the use and handling of refrigerants in stationary refrigeration and air conditioning equipment, including technician certification, recovery requirements, and the prohibition on venting.","topic":"Regulations"},{"question":"Under the Clean Air Act, which action is strictly prohibited?","options":["Using reclaimed refrigerant in a system","Purchasing refrigerant in 1-pound cans without certification","Knowingly venting refrigerants into the atmosphere during service","Adding refrigerant to a leaking system before repairing the leak"],"correct":2,"explanation":"The Clean Air Act strictly prohibits knowingly venting any refrigerant into the atmosphere. This applies to ALL refrigerant types, not just CFCs. The de minimis exemption covers only small unavoidable releases during good-faith recovery efforts.","topic":"Regulations"},{"question":"Which class of refrigerant has the HIGHEST ozone depletion potential (ODP)?","options":["HFOs (hydrofluoroolefins) such as R-1234yf","HCFCs (hydrochlorofluorocarbons) such as R-22","HFCs (hydrofluorocarbons) such as R-410A","CFCs (chlorofluorocarbons) such as R-11 and R-12"],"correct":3,"explanation":"CFCs (chlorofluorocarbons) have the highest ozone depletion potential. R-11 has an ODP of 1.0 (the reference standard) and R-12 also has an ODP of 1.0. CFCs release chlorine in the stratosphere, where each chlorine atom can destroy up to 100,000 ozone molecules.","topic":"Refrigerant Chemistry"},{"question":"R-22 is classified as which type of refrigerant?","options":["CFC - chlorofluorocarbon","HCFC - hydrochlorofluorocarbon","HFC - hydrofluorocarbon","Natural refrigerant"],"correct":1,"explanation":"R-22 (also known as Freon or HCFC-22) is a hydrochlorofluorocarbon (HCFC). It contains hydrogen, chlorine, fluorine, and carbon. HCFCs have a lower ODP than CFCs but still contain chlorine. R-22 production in the US ended in 2020.","topic":"Refrigerant Chemistry"},{"question":"Which refrigerant has an ozone depletion potential (ODP) of zero?","options":["R-11 (CFC-11)","R-22 (HCFC-22)","R-12 (CFC-12)","R-410A (HFC blend)"],"correct":3,"explanation":"R-410A is a hydrofluorocarbon (HFC) blend of R-32 and R-125. HFCs contain no chlorine or bromine atoms, giving them zero ozone depletion potential. However, R-410A has a global warming potential (GWP) of approximately 2,088.","topic":"Refrigerant Chemistry"},{"question":"The Montreal Protocol (1987) was an international agreement to:","options":["Reduce carbon dioxide emissions from air conditioning equipment","Phase out the production and use of ozone-depleting substances globally","Establish global minimum energy efficiency standards for refrigeration","Create uniform refrigerant identification and labeling requirements"],"correct":1,"explanation":"The Montreal Protocol on Substances that Deplete the Ozone Layer (1987) is an international treaty requiring the phaseout of ozone-depleting substances. It successfully eliminated CFC production by 2010 and HCFC production in developed nations by 2020. It has been ratified by 197 countries.","topic":"Environmental"},{"question":"Standard DOT refrigerant recovery cylinders are identified by:","options":["All yellow body with black lettering","Gray body with a yellow collar (top)","All gray body with white lettering","Green body with a white collar"],"correct":1,"explanation":"EPA-approved refrigerant recovery cylinders are standardized with a gray body and yellow collar (top section). This color coding distinguishes recovery cylinders from new refrigerant cylinders and allows quick identification in the field.","topic":"Safety"},{"question":"To legally purchase refrigerant in containers greater than 2 pounds, a technician must:","options":["Hold a valid contractor license in their state","Be EPA Section 608 certified under the appropriate type","Show proof of equipment ownership to the supplier","Obtain written authorization from an HVAC manufacturer"],"correct":1,"explanation":"EPA Section 608 requires that technicians purchasing refrigerant in containers greater than 2 pounds (approximately 900 grams) must be certified under Section 608. Refrigerant suppliers are required to verify certification before completing the sale.","topic":"Regulations"},{"question":"The de minimis exemption under Section 608 refers to:","options":["Small refrigeration systems that are completely exempt from all Section 608 rules","Small, unavoidable refrigerant releases that occur during good-faith recovery efforts","Systems charged with less than 5 pounds of refrigerant","Refrigerant releases considered harmless to the environment"],"correct":1,"explanation":"The de minimis exemption covers small, unavoidable refrigerant releases that occur when technicians are making good-faith efforts at recovery. Examples include small amounts released when disconnecting service hoses. This exemption does NOT cover intentional venting.","topic":"Regulations"},{"question":"Recovery and recycling equipment manufactured after November 15, 1993 must be:","options":["Registered directly with the EPA and assigned a certification number","Tested and certified by an EPA-approved testing organization such as UL or AHRI","Approved by the refrigerant manufacturer for use with their specific refrigerant","Inspected annually by a licensed HVAC contractor"],"correct":1,"explanation":"Recovery and recycling equipment manufactured after November 15, 1993 must be tested and certified by an EPA-approved testing organization. The two main approved organizations are UL (Underwriters Laboratories) and AHRI (Air-Conditioning, Heating, and Refrigeration Institute).","topic":"Equipment"},{"question":"Technicians must retain refrigerant service records for a minimum of:","options":["1 year from the date of service","3 years from the date of service","5 years from the date of service","10 years from the date of service"],"correct":1,"explanation":"EPA Section 608 requires that service records be retained for a minimum of 3 years. Records must include the date, type and amount of refrigerant added and recovered, and the name and certification number of the technician.","topic":"Regulations"},{"question":"Recovered refrigerant that has NOT been recycled or reclaimed may be returned to:","options":["Any system using the same type of refrigerant","The same system it was recovered from, or another system owned by the same owner","Any EPA-certified technician who requests it for a system repair","Only the original refrigerant manufacturer for proper disposal"],"correct":1,"explanation":"Unprocessed recovered refrigerant can only be returned to the same system it was recovered from, or to another system owned by the same person or company. It cannot be transferred to different customers or resold without first being reclaimed to ARI Standard 700 purity.","topic":"Recovery"},{"question":"Global Warming Potential (GWP) measures:","options":["The rate at which a refrigerant destroys stratospheric ozone molecules","The explosive potential of a refrigerant when exposed to open flame","How much heat a substance traps in the atmosphere relative to CO2 over 100 years","The toxicity rating of a refrigerant according to ASHRAE Standard 34"],"correct":2,"explanation":"GWP (Global Warming Potential) measures how much heat a greenhouse gas traps in the atmosphere over a 100-year period, compared to carbon dioxide (CO2 = 1). R-410A has a GWP of 2,088, meaning it traps 2,088 times more heat than an equivalent mass of CO2.","topic":"Environmental"},{"question":"Refrigerant recovery cylinders must never be filled beyond what percentage of their total capacity?","options":["60% by weight","70% by weight","80% by weight","90% by weight"],"correct":2,"explanation":"Recovery cylinders must never be filled beyond 80% of their capacity by weight. The remaining 20% provides essential space for thermal expansion of the liquid refrigerant as temperature increases. Overfilled cylinders can rupture violently when heated.","topic":"Safety"},{"question":"The ozone layer that protects Earth from harmful UV radiation is located in the:","options":["Troposphere - where weather and clouds occur","Stratosphere - approximately 15 to 35 km above Earth","Mesosphere - approximately 50 to 85 km above Earth","Thermosphere - approximately 80 to 700 km above Earth"],"correct":1,"explanation":"The ozone layer is located in the stratosphere, approximately 15 to 35 kilometers above Earth's surface. The stratosphere is above the troposphere (where weather occurs). Remember: ozone is beneficial in the stratosphere (blocks UV) but a pollutant at ground level (smog).","topic":"Environmental"},{"question":"R-12 (Freon-12) is classified as which type of refrigerant?","options":["HFC - hydrofluorocarbon with zero ODP","HCFC - hydrochlorofluorocarbon with low ODP","CFC - chlorofluorocarbon with high ODP","Natural refrigerant with zero ODP"],"correct":2,"explanation":"R-12 is a CFC (chlorofluorocarbon), the most ozone-damaging class of refrigerants. It has an ODP of 1.0 (same as R-11, the reference standard) and a GWP of 10,900. R-12 was banned and phased out in the US by 1996.","topic":"Refrigerant Chemistry"},{"question":"Which refrigerant has the HIGHEST Global Warming Potential (GWP) among common HVAC refrigerants?","options":["R-32 with a GWP of approximately 675","R-134a with a GWP of approximately 1,430","R-410A with a GWP of approximately 2,088","R-404A with a GWP of approximately 3,922"],"correct":3,"explanation":"R-404A has a GWP of approximately 3,922, making it the highest GWP refrigerant among commonly used HVAC refrigerants. It is being phased out of commercial refrigeration applications due to its extremely high climate impact.","topic":"Environmental"},{"question":"For comfort cooling systems containing 50 or more pounds of refrigerant, what leak rate requires mandatory repair?","options":["When the system loses any refrigerant during normal operation","When the annual leak rate exceeds 30% of the total system charge","When the annual leak rate exceeds 50% of the total system charge","When any leaks are detected during a scheduled inspection"],"correct":1,"explanation":"EPA regulations require owners of comfort cooling equipment with 50+ lbs of refrigerant to repair leaks when the annual leak rate exceeds 30% of the system's total charge. Repairs must be completed within 30 days of discovering the leak exceeds the threshold.","topic":"Regulations"},{"question":"Reclaimed refrigerant must meet which purity standard before it can be resold?","options":["ASHRAE Standard 34 safety classification requirements","EPA Section 608 minimum recovery efficiency standards","ARI Standard 700 purity requirements for reclaimed refrigerants","NIST Standard 90 chemical composition requirements"],"correct":2,"explanation":"Reclaimed refrigerant must meet ARI Standard 700 purity requirements, which are equivalent to the specifications for new (virgin) refrigerant. Only reclaimed refrigerant meeting this standard can be legally resold. Recovered or recycled refrigerant that has not been processed to ARI 700 cannot be sold.","topic":"Recovery"},{"question":"The maximum civil penalty per day per violation of Section 608 is approximately:","options":["Up to $5,000 per day per violation","Up to $15,000 per day per violation","Up to $25,000 per day per violation","Up to $44,539 per day per violation"],"correct":3,"explanation":"The Clean Air Act authorizes civil penalties of up to $44,539 per day per violation of Section 608 (this amount is periodically adjusted for inflation). Criminal penalties including imprisonment are also possible for knowing violations. Loss of technician certification is an additional consequence.","topic":"Regulations"},{"question":"R-410A is classified as which type of refrigerant?","options":["CFC - chlorofluorocarbon","HCFC - hydrochlorofluorocarbon","HFC - hydrofluorocarbon blend (R-32 and R-125)","Natural refrigerant"],"correct":2,"explanation":"R-410A is an HFC (hydrofluorocarbon) blend consisting of 50% R-32 and 50% R-125. As an HFC, it has zero ozone depletion potential but a high global warming potential of 2,088. It is being phased down under the AIM Act, with new equipment transitioning to R-454B.","topic":"Refrigerant Chemistry"},{"question":"Which statement about HFC refrigerants (such as R-410A and R-134a) is CORRECT?","options":["HFCs have high ozone depletion potential similar to CFCs","HFCs contain chlorine atoms which destroy stratospheric ozone","HFCs have zero ozone depletion potential but contribute significantly to climate change","HFCs are being phased out because they destroy the ozone layer like CFCs"],"correct":2,"explanation":"HFCs (hydrofluorocarbons) contain no chlorine or bromine, giving them zero ozone depletion potential (ODP = 0). However, they are potent greenhouse gases with high GWP values. They are being phased down under the AIM Act due to their climate impact, NOT due to ozone depletion.","topic":"Refrigerant Chemistry"},{"question":"Before opening any refrigerant circuit for service, a technician must first:","options":["Notify the EPA regional office of the planned service","Recover refrigerant to the required evacuation level for that equipment type","Add a UV dye tracer to verify the leak location","Verify the system pressure is exactly at 0 psig"],"correct":1,"explanation":"Before opening any refrigerant circuit (service valves, service ports, or any component of the refrigerant system), the technician must recover refrigerant to the required evacuation level. Required levels vary based on refrigerant type, system size, and equipment manufacturing date.","topic":"Recovery"},{"question":"How do chlorine atoms from CFCs cause ozone destruction in the stratosphere?","options":["They combine with UV radiation to form toxic compounds that absorb ozone","They bond to nitrogen molecules preventing ozone formation","Each chlorine atom catalytically destroys thousands of ozone molecules without being consumed","They block sunlight that would otherwise energize ozone molecule formation"],"correct":2,"explanation":"Chlorine atoms act as catalysts in ozone destruction. Each chlorine atom can destroy up to 100,000 ozone molecules before being deactivated. Because chlorine is not consumed in the reaction, a single chlorine molecule from a CFC can continue causing damage for decades.","topic":"Environmental"},{"question":"A technician who knowingly releases refrigerant can face which consequences?","options":["Only civil financial penalties up to the maximum amount","Only criminal charges if the amount vented exceeds 100 pounds","Both civil and criminal penalties, plus possible loss of certification","Only a warning letter from the EPA for a first-time offense"],"correct":2,"explanation":"Section 608 violations can result in civil penalties (up to $44,539 per day per violation), criminal penalties (fines and imprisonment for knowing violations), and revocation of EPA technician certification. Private citizens can also file suit for violations they discover.","topic":"Regulations"}]}