EPA 608 Core Test Sample Questions and Answers Latest 2024 with Complete solution, Exams of Physics

Download EPA 608 Core Test Sample Questions and Answers Latest 2024 with Complete solution and more Exams Physics in PDF only on Docsity! EPA 608 Core Test Sample Questions and Answers Latest 2024 with Complete solution 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 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-12 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? 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 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 Recovered 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 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: 607 608 609 507 - Correct answer-609 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. - Correct answer-All the options are correct R-134a belongs to which of the following refrigerant group: HFC CFC HCFC - Correct answer-HFC is used to the push-pull method of refrigeration: Triple-valve recovery tank Dual-valve recovery tank Quadruple recovery tank - Correct answer-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 - Correct answer-CFC-11 CFC-11 and CFC-12 Ozone depleting substances constitutes of of stratospheric chlorine 82% 51% 18% 70% - Correct answer-51% Low-pressure systems typically have a pressure relief valve set at : 25 psi 10 psi 15 psi 20 psi - Correct answer-15 psi Process involved for Reclamation and recycling of refrigerants are same: False Flushing agents shall not be introduced into which of the following in a refrigeration system: Compressor Evaporator Condenser Condenser lines - Correct answer-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 - Correct answer-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 - Correct answer-Halide torch All refrigerant oils are hygroscopic: True False - Correct answer-True Refrigerant in Discharge Line will be in which of the following phase: Hot vapor Hot liquid Cold vapor Cold liquid - Correct answer-Hot vapor The warmer the temperature of the refrigerant, the slower it will evacuate: True False - Correct answer-False Schrader valves are present on which of the following: Both the options are correct Recovery equipment. Refrigerant systems - Correct answer-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 - Correct answer-alcohol spray Mixed refrigerants in the same tank may be impossible to reclaim: True False - Correct answer-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 - Correct answer-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 - Correct answer-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 - Correct answer-compressor When ozone reacts with chlorine ion which of the following is obtained: Oxygen HCl All the options are correct Fluorine - Correct answer-Oxygen When evacuation of the refrigerant, larger the diameter of the suction hoses, will be recovery rate of the refrigerant: Faster Slower - Correct answer-Faster Which of the following when mixed with refrigerants cannot cause an explosion: Compressed air Compressed hydrogen Oxygen Compressed nitrogen - Correct answer-Compressed nitrogen Disposable cylinders are used only for which of the following refrigerant: Recovery refrigerant Either virgin or recovery refrigerant Virgin refrigerant - Correct answer-Virgin refrigerant Only CFCs and HCFCs refrigerants are to be mandatorily recovered: False True - Correct answer-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 - Correct answer-Both the options are correct Which of the following refrigerant is used in medium pressure appliance: R-503 R-11 R-500 R-410A - Correct answer-R-500 Which one of the following has minimal ozone depletion potential: HFC HCFC CFC - Correct answer-HFC Stratosphere layer consists of of the available Ozone on the earth's atmosphere: 50% 90% $ 35,000 - Correct answer-$ 10,000 Which of the following is the responsibilities of the Clean Air Act: Prohibit venting Disposal requirements Set dates to phase out of CFCs and HCFCs All the options are correct - Correct answer-All the options are correct The occurs when the saturation temperature in the evaporator causes the refrigerant to change from a liquid to a vapor Dew point Saturation point Evaporation point Bubble point - Correct answer-Dew point Which of the following not correct with reference to three 'R' s: Recovery Reclaim Re-use Recycle - Correct answer-Re-use of stratospheric chlorine comes from ozone-depleting substances: 51% 82% 18% 72% - Correct answer-82% R-134a refrigerant is used in which of the following appliance: Low pressure appliance High pressure appliance Medium pressure appliance - Correct answer-High pressure appliance f the refrigerant system compared to cylinder is warmer, then the refrigerant recovery rate will be: Faster Independent Slower - Correct answer-Faster To is to clean refrigerant for immediate reuse: Recycle Recover Reclaim - Correct answer-Recycle Ternary blend refrigerant consists of mixture of refrigerants: Five Two Four Three - Correct answer-Three nitrogen is used to pressurize the system: Gaseous Either Liquid or Gaseous Liquid - Correct answer-Gaseous Montreal Protocol agreement is not called for a phase out of following refrigerants: CFCs HCFCs Halons HFCs - Correct answer-HFCs Disposable cylinders consists of which of the following: Two way valve Three way valve Will have no valves One-way valve - Correct answer-One-way valve An electronic leak detector can detect leak rates of about per year: 2 oz 0.5 oz 0.1 oz 1 oz - Correct answer-0.5 oz The scale on the high pressure of gauge manifold is calibrated in the range: 0 to 200 psi 0 to 500 psi 0 to 1000 psi 0 to 100 psi - Correct answer-0 to 500 psi Vacuum lines (hoses) of the evacuation system should be equal to or larger than the pump intake connection False True - Correct answer-True Recovery is done in order to have which of the following: Adequate supplies for service after production bans Prevent stratospheric ozone depletion Prevent venting to the atmosphere All options are correct - Correct answer-All options are correct Ban on the production or import of any HCFC refrigerant will take effect from . 2018 2024 2015 2020 - Correct answer-2020 Which one the of the following refrigerants contribute to global warming: All the mentioned refrigerants contributes HCFC HCF CFC - Correct answer-All the mentioned refrigerants contributes Evaporator is located in which part of the refrigeration cycle: Low pressure side High pressure side - Correct answer-Low pressure side Which one of the following is HCFC refrigerant: R-113 R-11 R-22 R-123 - Correct answer-R-22 Reclaimed refrigerant must meet the standard set forth in before it can be resold ARI 740 ARI 700 ARI 500 ARI 1000 - Correct answer-ARI 700 Bubble point Saturation point Condensing point Dew point - Correct answer-Bubble point The condenser rejects the heat from the system: False True - Correct answer-True Which of the following has very low molecular weight: Helium Oxygen Carbon-dioxide Nitrogen - Correct answer-Helium Upon leaving the evaporator, the refrigerant is at which of the following phase: Low pressure, low temperature vapor Low pressure, low temperature liquid High pressure, high temperature vapor High pressure, high temperature liquid - Correct answer-Low pressure, low temperature vapor HCFC ban will extend to all HCFCs for use in new systems will effect from which year: January 1, 2015 January 1, 2020 January 1, 2018 January 1, 2018 - Correct answer-January 1, 2015 Refrigeration technicians who violate the Clean Air Act may: Lose their EPA certification Fined Required to appear in federal court. All the options are correct - Correct answer-All the options are correct As the pressure on the liquid increases, the vaporization temperature of the liquid: Decreases Increases Remains unaltered - Correct answer-Increases Technicians servicing appliances that contain or more of refrigerant must provide the owner with an invoice that indicates the amount of refrigerant added to the appliance 40 pounds 50 pounds 60 pounds 20 pounds - Correct answer-50 pounds CFCs are highly stable in lower part of the atmosphere: True False - Correct answer-True Tendency to leak of the refrigerant depends on which of the following: Specific heat Compressibility Molecular weight Viscosity - Correct answer-Molecular weight During vacuum leak test if the pressure increases after a while, then refrigerant is still trapped in the system above 0 psig less than 0 psig equal to 0 psig - Correct answer-above 0 psig Which of the following gas is used for holding charges or as leak test gases may be released: Nitrogen Compressed air Hydrogen Oxygen - Correct answer-Nitrogen which formed at the stratosphere is unstable and strips a free oxygen atom and then releases the chlorine ion which continue the chain reaction of destroying ozone molecules: Chlorine dioxide Chlorine trioxide Chlorine monoxide Chlorine oxide - Correct answer-Chlorine monoxide Oil is used in compressor for which one of the following purposes: Cooling Lubrication Both lubrication and cooling - Correct answer-Both lubrication and cooling Refrigerant will be in phase in suction line: Cold vapor Hot vapor Warm liquid Cold liquid - Correct answer-Cold vapor R-500 Refrigerant consists of which of the following: CFCs HCFs HCFCs - Correct answer-CFCs In halide leak test if there is a refrigerant leak, the flame will turn: Red Green Blue Yellow - Correct answer-Green Atmospheric pressure is pounds per square inch: 1470 1.470 147 14.7 - Correct answer-14.7 Which of the following has the ozone depletion potential of 1: R-11 R-12 R-22 R-23 - Correct answer-R-11 After , the servicing of R-22-based systems will rely on recycled refrigerants: 2020 2015 2018 The warmer the temperature, the will be evacuation of the refrigerant from the refrigeration system slower faster - Correct answer-faster To is a process in which refrigerant to the level of new product specifications as determined by chemical analysis: Recycle Reclaim Recover - Correct answer-Reclaim From scientific studies it is found that of the chlorine in the atmosphere is human made: 60% 95% 80% 25% - Correct answer-80% R-500 is example of which of the following: CFC HCFC HFC - Correct answer-CFC Which of the following devices converts low pressure low temperature vapor to high pressure high temperature vapor: Compressor Condenser Expansion device Evaporator - Correct answer-Compressor Refrigerants represented by letter will have higher Toxicity: A B - Correct answer-B CFCs are phased out on : Dec 31, 1995 Dec 31, 1996 Jan 1, 1995 Jan 1, 1996 - Correct answer-Dec 31, 1995 Ozone at ground level is considered as bad and pollutant: False True - Correct answer-True Which of the following is the example of HFC: R-22 R-134a R-123 R-500 - Correct answer-R-134a Halide torch is effective method for checking which of the following leaks: Small Medium Large - Correct answer-Small The condenser rejects heat from the system and changes high pressure and high temperature refrigerant vapor to low pressure low temperature refrigerant vapor: False True - Correct answer-False Which of the following compound is obtained when chlorine atom reacts with ozone molecule: Chlorine dioxide Chlorine Monoxide Chlorine oxide Chlorine peroxide - Correct answer-Chlorine Monoxide Asphyxia is the phenomenon in which in the blood caused by respiratory interference: Both the answers are correct Lack of oxygen Excess of Carbon dioxide - Correct answer-Both the answers are correct The colder the ambient temperature, the the recovery process of the refrigerants: Longer Shorter - Correct answer-Longer Reclaimed refrigerant must meet the standard set forth in before it can be resold: ARI 700 ARI 1000 ASHRAE 1000 ASHRAE 700 - Correct answer-ARI 700 The high pressure gauge in gauge manifold is usually in color: Yellow Blue Green Red - Correct answer-Red CFCs and HCFCs must be recovered before opening a system for service: False True - Correct answer-True The more the moisture in the refrigeration system, the it will take for the refrigerant to evacuate: Longer Shorter Moisture will have no effect - Correct answer-Longer Which of the following is associated with cleaning the refrigerants for immediate use by removing oil, moisture and acidity from the refrigerant by using filter driers: Reclaim Recover Recycle - Correct answer-Recycle Which one of the following has least ozone depletion potential: CFC All the options are correct HFC HCFC - Correct answer-HFC Refrigerant oil must be miscible at high temperature: False True - Correct answer-False 90 and 120 miles - Correct answer-10 and 30 miles An azeotrope mixture does not have a temperature glide False True - Correct answer-True Refrigerants are than air: heavier lighter - Correct answer-heavier A drier should be installed to trap any debris that may damage the compressor: discharge line filter suction line filter vapor line filter liquid line filter - Correct answer-suction line filter To is to process refrigerant to a level equal to new (virgin) product specifications as determined by chemical analysis. Recover Recycle Reclaim Repair - Correct answer-Reclaim Recovery cylinders have how many port(s) 4 1 3 2 - Correct answer-2 Refillable cylinders must be hydrostatically tested and date stamped every years: 2 5 3 1.5 - Correct answer-5 If moisture is allowed to remain in an operating refrigeration system which of the following is formed: hydrofluoric acid hydrochloric acid both the options are correct - Correct answer-both the options are correct Ozone protects us from harmful infrared radiation ultraviolet radiation both options are correct - Correct answer-ultraviolet radiatio R-134A will mix with most refrigerant oils True False - Correct answer-False As of , the sale of CFC and HCFC refrigerants is restricted to certified technicians only: Dec 31, 1994 Nov 14, 1995 Dec 31, 1995 Nov 14, 1994 - Correct answer-Nov 14, 1994 Relief valves must be installed in which of the following arrangement parallel series either series or parallel - Correct answer-parallel Which of the following is used for pinpoint the leak in the refrigeration system: electronic leak detector ultrasonic leak detector Soap bubbles - Correct answer-Soap bubbles At high temperatures R-12 and R-22 decompose to form which of the following: Phosgene gas Hydrofluoric acid Hydrochloric acid All the options are correct - Correct answer-All the options are correct The will collide with another Ozone molecule, release its Oxygen atom: Chlorine Monoxide Chlorine Peroxide Chlorine Pent-oxide Chlorine Dioxide - Correct answer-Chlorine Monoxide When leak testing an R-134A system which of the following is used: pressurized nitrogen pressurized hydrogen pressurized air all the options are correct - Correct answer-pressurized nitrogen Approved refrigerant recovery cylinders can easily be identified by which of the following colors: Gray Tops and Yellow Bodies Yellow Tops and Gray Bodies Blue Tops and Yellow Bodies Yellow Tops and Blue Bodies - Correct answer-Yellow Tops and Gray Bodies If they show signs of rust or appear to not be secure they should be reduced to and discarded 0 psig negative psig 1 psig positive psig - Correct answer-0 psig To the refrigerant is to remove refrigerant in any condition from a system and store it in an external container Restore Recycle Reclaim Recover - Correct answer-Recover Long hoses will cause excessive pressure drop: True False - Correct answer-True Refillable cylinders used for transporting recovered pressurized refrigerant must be approved by: ARI EPA ASHRAE DOT - Correct answer-DOT False True - Correct answer-True The oils used in most R-134A refrigeration systems are ESTERS True False - Correct answer-True As per EPA Vent HFC's is a violation since : Nov 15, 1994 Nov 15, 1995 Jul 1, 1992 Jul 1, 1994 - Correct answer-Nov 15, 1995 After recovering refrigerant, if nitrogen is used to flush debris out of the system, the nitrogen may not be legally vented True False - Correct answer-False Depletion of Ozone in the stratosphere causes increase in ground level ozone: True False - Correct answer-True In large quantities, refrigerants can displace oxygen leads to suffocation: True False - Correct answer-True Volcanoes contribute large quantity of Chlorine as compared to CFC's however it is dissolves with water and comes down with rain: False True - Correct answer-False Refrigerant Recovery and/or Recycling equipment manufactured after , must be certified and labeled by an EPA approved equipment testing organization to meet EPA standards. Dec 31, 1994 Dec 31, 1995 Jul 12, 1992 Nov 15, 1993 - Correct answer-Nov 15, 1993 The system vacuum gauge should be connected as far as possible from the vacuum pump False True - Correct answer-True To is to clean refrigerant for reuse by separating the oil from the refrigerant and removing moisture from the refrigerant by passing it through one or more filter driers Recycle Restore Reclaim Recover - Correct answer-Recycle When mixed with refrigerants oxygen or compressed air can cause an explosion True False - Correct answer-True Only technicians certified under Clean Air Act Section 609 are allowed to purchase refrigerants in containers smaller than 15 lbs 25 lbs 20 lbs 10 lbs - Correct answer-20 lbs The piping connection to the vacuum pump should be as large in diameter as possible: True False - Correct answer-True Inhaling refrigerant vapors or mist may cause which of the following: Unconsciousness All the options are correct Heart irregularities Oxygen deprivation - Correct answer-All the options are correct Different refrigerants must not be mixed in the same recovery tank: True False - Correct answer-True Which of the following cylinders are used only with virgin refrigerant: Disposable Recovery Either disposable or recovery - Correct answer-Disposable Vent CFC's or HCFC's into the atmosphere is banned since July 1, 1994 July 1, 1992 Nov 14, 1994 Nov 14, 1992 - Correct answer-July 1, 1992 The Clean Air Act has been responsible for prohibiting the venting of refrigerants True False - Correct answer-True recovery equipment can only be used on appliances with 15 pounds or less of refrigerant: System-dependent Self-contained - Correct answer-System-dependent Refrigerant cylinder may be heated with an open flame during recovery: False True - Correct answer-True Short hoses results in increased recovery time: True False - Correct answer-False Reclaimed supplies of CFCs are still available False True - Correct answer-True