EPA 608 Core Test Sample Questions and Answers 2024

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 - 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 - 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 - d. Chlorine What is an ozone molecule made of? a. Refrigerant b. Ammonia c. Three oxygen atoms (O3). d. Oxygen and ammonia. - Three oxygen atoms (O3). Which refrigerant is a CFC? a. R-134A b. R-123 c. R-22 d. R-12 - 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 - 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 - 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. - 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 - 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 - 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% - c. 80% What do the letters in "HCFC" stand for? a. High Carbon Fluorine Chlorine b. hydrochlorofluorocarbons c. Harmful Carbon Fluorine Chlorine d. highchlorinefluorocarbon - b. hydrochlorofluorocarbons 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. - 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 What is ODP? a. Oxygen Destruction Properties b. Ozone Depletion Potential c. Ozone Destruction Properties d. Oxygen Depletion Potential - b. Ozone Depletion Potential 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 - d. R-134A is not a drop-in refrigerant 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 - d. All the above The condition and state of the refrigerant leaving a receiver is? a. Subcooled liquid b. Subcooled vapor c. Superheated vapor d. Superheated liquid. - a. Subcooled liquid 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 d. Imported from South America - c. Recovery and recycling 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 - b. Recover to (0 psig) or lower and rendered useless 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 - d. Refrigerant must be recovered 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 - d. Final person in the disposal chain 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 - d. All the above 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 - d. a and b 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 - a. They leak at different rates because they retain their different vapor pressures. What does a compressor compress? a. Liquid refrigerant b. Hot vapor c. High pressure vapor d. Low pressure, low temperature vapor - 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. - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 the above - d. All the above 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 - a. Certified and labeled by an EPA approved What are types of recovery equipment used? a. System dependent b. Self-contained c. Container less d. a and b - d. a and b 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 - d. All of the above 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 - 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 - a. Recover into a separate tank 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 - c. Flush debris and trap any debris 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - b. Oxygen deprivation 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 - d. All the above 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 - a. Refrigerants can be deadly if inhaled or allowed to be heated 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 - 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. 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 - a. The alarm will sound before the TLV-TWA (Threshold Limit Value - Time weighted Average) is exceeded (oxygen deprivation level). 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. - a. A-1 is considered the safest refrigerant while B-3 is the least safe 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 - 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 - 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 - 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 - 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 - 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 - 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). - 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 - 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 - 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 - 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 - 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 - d. All the above What are the ways you can control the fill level of a refillable cylinder? a. Mechanical float devices b. Electronic float devices c. Weight d. All the above - d. All the above In what position should cylinders be shipped? a. Nested in a vertical cradle b. Upright position c. Stacked in vertical, bundled and strapped on a pallet TXV valve maintaining the pressure difference between and of the d. All the above - b. Upright position What type of DOT tag is required for shipping refrigerant cylinders? a. DOT classification tag indicating it is a "2.2 non-flammable gas" b. DOT classification tag indicating it is a "high pressure gas" c. DOT classification tag indicating it is a "refrigerant gas" d. DOT classification tag indicating it is a "liquid refrigerant" - a. DOT classification tag indicating it is a "2.2 non-flammable gas" A cylinder label must contain what type of information about the refrigerant? a. Weight of refrigerant b. Type and amount of refrigerant c. Pressure of cylinder d. None of the above - b. Type and amount of refrigerant system Evaporator, Compressor Condenser, Evaporator Expansion valve, Evaporator Compressor, Condenser - Condenser, Evaporator Only refrigerant can be transferred or sold to another individual Recycled Recovered Disposed Reclaimed - Reclaimed A violation of the Clean Air Act, including improper record keeping, is subject to a penalty of a fine of up to per day per violation: $37,500 $24,000 $35,000 $40,000 - $37,500 According to the EPA, which of the following is not most effective way to detect the general area of a small leaks: fluorescent Indicator Electronic tester Ultrasonic tester All the options are correct - fluorescent Indicator If your recovery unit does not have a sub-cooling feature recovery rate will be Recovery rate is independent Faster - Faster Lifetime of CFCs is believed to range from : 100 to 500 years 20 to 100 years 5 to 10 years Above 1000 years - 20 to 100 years Refrigerant cannot be called reclaimed unless it meets the purity standard: ARI-740 ARI-360 ARI-700 ARI-1024 - ARI-700 Which one of the following has higher Ozone Depletion Potential (ODP): HFC HCFC All options are correct CFC - CFC The connects the evaporator to the compressor in a refrigerant system: Discharge Line Liquid Line Suction Line Evaporation Line - Suction Line Halons were completely phased out by : - 1994 It is to be ensured that the refrigerant recovery cylinder is not filled to more than of its capacity : Slower 80 percent 50 percent 60 percent 90 percent - 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 - Acidic A recovery cylinder can maximum store refrigerants: 3 2 1 4 - 1 One chlorine ion can able to destroy ozone molecules: 100 10,000 100,,000 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 - 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 - Nitrogen gas EPA has divided refrigerated appliances into groups Four Five Six Three - Five Recovered refrigerant are stored in tanks are painted : Yellow with blue tops Blue with yellow tops Gray with yellow tops Yellow with gray tops - Gray with yellow tops At which of the following in refrigeration cycle changes a high-pressure vapor to a high-pressure liquid by rejecting heat from the refrigerant: Condenser Evaporator Expansion valve Compressor - Condenser A vacuum test could actually hide a leak: False True - True Recovered refrigerant can be returned to the same system or other systems owned by the same person without restriction: False True - True Two refrigerants are not allowed to collect into one recovery cylinder because: Both the options are correct Refrigerant mixture can react each other and explode Recovery back of two refrigerants from mixture is not possible - Recovery back of two refrigerants from mixture is not possible breaks down the CFCs and frees the chlorine ion: X-radiation Infrared radiation Ultraviolet radiation Gamma radiation - Ultraviolet radiation The diameter of the liquid line must be as as possible to minimize the total refrigerant charge: Large Small - small Nitrogen react with hydrogen to form which of the following: Nitrogen Hydroxide Nitrogen Hydride Nitrogen does not react with hydrogen Ammonia - Ammonia Which of the following is used to minimize the leakage of refrigerant while checking: Either can be used Self-sealing hoses Hand valves - Either can be used Ozone is a unstable molecule: True False - true Presence of which of the following element will reduce the stability of the Ozone Depletion Substances: All options are correct Bromine Chlorine Hydrogen - Hydrogen The color of low-pressure port of the manifold that is connected to the low side of the system Red Blue Green Yellow - Blue Which of the refrigerant is used in low pressure refrigerated appliance: R-114 R-12 R-123 R-500 - R-123 This suction line filter drier should be located just upstream of the inlet: Evaporator Condenser Compressor Expansion valve - Compressor If the vacuum pump used is too large, water removal will become: Easier Remains same Difficult - 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 - 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 - 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 - 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 - Pressure-Temperature method A vacuum test allows air and moisture to enter the system if there is a leak: True False - True Motor Vehicle Air Conditioning (MVAC) service technicians are governed under a section: Refrigeration technicians who violate the Clean Air Act may: Be fined Lose their EPA certification All the options are correct Required to appear in federal court. - All the options are correct R-134a belongs to which of the following refrigerant group: HFC CFC HCFC - HFC is used to the push-pull method of refrigeration: Triple-valve recovery tank Dual-valve recovery tank Quadruple recovery tank - Dual-valve recovery tank which one of the following has Ozone Depletion Potential (ODP) value of 1: HCFC-22 CFC-11 CFC-12 HCFC-23 - CFC-11 CFC-11 and CFC-12 Ozone depleting substances constitutes of of stratospheric chlorine 82% 51% 18% 70% - 51% Low-pressure systems typically have a pressure relief valve set at : 25 psi 10 psi 15 psi 20 psi - 15 psi Process involved for Reclamation and recycling of refrigerants are same: False True - Suction line consists of which of the following: Hot vapor Warm liquid Cool vapor Cold water - Cool vapor Reusable containers for refrigerants shall be tested for hydrostatically tested and date stamped for every : 5 Years 2 Years 1 Year 3 Years - 5 Years CFCs are highly reactive in lower levels of atmosphere: True False - False recovery is the fastest and takes up less volume per pound of refrigerant to recover: Gas Either Liquid and Gas Liquid - Liquid According to EPA requirements, systems that contain or more of refrigerant to have "substantial leaks" repaired within 30 days. 100 pounds 25 pounds 10 pounds 50 pounds - 50 pounds Which of the following device is located at the end of the liquid line: Expansion device Compressor Condenser Evaporator - Expansion device The purged nitrogen gas shall be: Evacuated in to separate container and send to EPA Vented to atmosphere Evacuated in to separate container and is recycled Evacuated in to separate container and is disposed - Vented to atmosphere refrigerant cannot be transferred to another owner: Reclaimed Recycled - Recycled Dehydration evacuation will never remove mineral oil or the acid trapped in the oil: True False - True The pressure of Nitrogen at which that is introduced into the evacuation system after evacuation of refrigerant is: Slightly above than the atmospheric pressure Slightly lower than the atmospheric pressure Equal the atmospheric pressure - Slightly above than the atmospheric pressure Long hoses between the unit and the recovery machine results in in recovery time: Has no impact on length of hoses Increase Decrease - Increase Which of the following refrigerant is used in high pressure appliance: R-503 R-22 R-500 R-410A - R-503 Montreal Protocol is signed in which of the following year: - 1987 Flushing agents shall not be introduced into which of the following in a refrigeration system: Compressor Evaporator Condenser Condenser lines - Compressor Flushing agent will removes lubrication oil of compressor At which of the following stage of the refrigeration system the refrigerant is in Warm liquid: Discharge line Suction line Expansion line Liquid Line - Liquid Line When checking for small leaks, using a is the most effective method: Visual oil-soluble dye indicator All the options are correct Fluorescent dye indicator Halide torch - Halide torch All refrigerant oils are hygroscopic: True False - True Refrigerant in Discharge Line will be in which of the following phase: Hot vapor Hot liquid Cold vapor Cold liquid - Hot vapor The warmer the temperature of the refrigerant, the slower it will evacuate: True False - False Schrader valves are present on which of the following: Both the options are correct Recovery equipment. Refrigerant systems - Both the options are correct If icing occurs on the sight glass, which of the following is used to remove the ice: alcohol spray QwikShot acid flush liquid nitrogen liquid ammonia - alcohol spray Mixed refrigerants in the same tank may be impossible to reclaim: True False - True For obtaining the most accurate readings during evacuation process, the vacuum gauge should be located as as possible from the vacuum pump: Near Far Distance between vacuum pump and vacuum gauge does not have any effect - far Which of the following is formed when refrigerants exposed to flames or steam which is poisonous: Hydrofluoric Carbonyl halides Phosgene gas All the options are correct - All the options are correct Which of the following device takes the low pressure, low temperature refrigerant vapor and changes it to a high-temperature, high-pressure, superheated refrigerant vapor: Condenser Expansion valve compressor Evaporator - compressor When ozone reacts with chlorine ion which of the following is obtained: Oxygen HCl All the options are correct Fluorine - Oxygen When evacuation of the refrigerant, larger the diameter of the suction hoses, will be recovery rate of the refrigerant: Faster Slower - Faster Which of the following when mixed with refrigerants cannot cause an explosion: Compressed air Compressed hydrogen Oxygen Compressed nitrogen - Compressed nitrogen Disposable cylinders are used only for which of the following refrigerant: Recovery refrigerant Either virgin or recovery refrigerant Virgin refrigerant - Virgin refrigerant Only CFCs and HCFCs refrigerants are to be mandatorily recovered: False True - False all refrigerants must be recovered not only CFCs and HCFCs Oil is used in compressor for which of the following purpose: seal the moving parts of a compressor Both the options are correct lubrication - Both the options are correct Which of the following refrigerant is used in medium pressure appliance: R-503 R-11 R-500 R-410A - R-500 Which one of the following has minimal ozone depletion potential: HFC HCFC CFC - HFC Stratosphere layer consists of of the available Ozone on the earth's atmosphere: 50% 90% 20% 70% - 90% The center port of the service manifold is usually have hose: yellow blue red green - yellow R-22 belongs to which of the following refrigerant group: HCFC HFC CFC - HCFC Condenser is present in which of the following refrigeration cycle: High pressure side Low pressure side - High pressure side Which of the following refrigerant is commonly used in new residential and small commercial heat pump and air conditioning systems in place of R-22 R-410a R-123 R-124 R-116 - R-410a An listens for the noise of gas leakage: Ultrasonic leak tester Fluorescent leak detector Helium leak detector Vacuum leak detector - Ultrasonic leak tester Which of the following gas is used to determine the leak in the system: Nitrogen Oxygen Helium Carbondioxide - Helium Refrigerants in Suction line will be in which of the following phase: Cold liquid Hot vapor Cool vapor Warm liquid - Cool vapor