EPA 608 Core Test Sample Questions and Answers 2024, Exams of Physics

Download EPA 608 Core Test Sample Questions and Answers 2024 and more Exams Physics in PDF only on Docsity!

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 - 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- d. R-12 - Correct answer-d. R- 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- 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 O 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- 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- 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

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. - Correct 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 What is ODP? a. Oxygen Destruction Properties b. Ozone Depletion Potential c. Ozone Destruction Properties d. Oxygen Depletion Potential - Correct answer-b. Ozone Depletion Potential R-134A is a "drop in" refrigerant for? 36 | P a g e a. R- b. R- c. R- d. R-134A is not a drop-in refrigerant - Correct answer-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 - Correct answer-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. - Correct answer-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 - 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- 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

d. Imported from South America - Correct answer-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 - Correct answer-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 - Correct answer-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 - Correct answer-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- d. All the above - Correct answer-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 - Correct answer-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 - Correct answer-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 - 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 the above - Correct answer-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 - Correct answer-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 - Correct answer-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 - Correct answer-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 - Correct answer- 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 - Correct answer-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 - Correct answer-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 - 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

d. All the above - Correct answer-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 - Correct answer-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 - Correct 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. 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 - Correct answer-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. - Correct answer-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 - 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

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 - Correct answer-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 d. All the above - Correct answer-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" - Correct answer-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 - Correct answer-b. Type and amount of refrigerant TXV valve maintaining the pressure difference between and of the system Evaporator, Compressor Condenser, Evaporator Expansion valve, Evaporator Compressor, Condenser - Correct answer-Condenser, Evaporator Only refrigerant can be transferred or sold to another individual Recycled Recovere d Disposed Reclaimed - Correct answer-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 - Correct answer-$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 - 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 10,000 100,000 1000 - Correct answer-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 - 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