EPA 608 |REFRIGERATION SYSTEM REGULATIONS| 52 QUESTIONS 2025

Halons were completely phased out by ______ : 1994 1995 1987 2000 - ANS- 1994 Recovered refrigerant is stored in which of the following painted tank: Gray with yellow top Yellow with gray top Yellow with blue top Blue with yellow top - ANS- Gray with yellow top If your recovery unit does not have a sub-cooling feature recovery rate will be _____ : Recovery rate is independent Slower Faster - ANS- Slower TXV valve maintaining the pressure difference between _____ and _____ of the system Expansion valve, Evaporator Condenser, Evaporator Compressor, Condenser Evaporator, Compressor - ANS- Condenser, Evaporator 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: Hydrogen Carbon dioxide Oxygen Nitrogen gas - ANS- Nitrogen gas Which one of the following has highest Ozone Depletion Potential (ODP): HCFC All will have same ODP CFC HFC - ANS- CFC The ____connects the evaporator to the compressor in a refrigerant system: Suction Line Evaporation Line Discharge Line Liquid Line - ANS- Suction Line 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 $40,000 $24,000 $35,000 - ANS- $37,500 At which of the following stage in refrigeration cycle does the refrigerant changes from high-pressure vapor to a high-pressure liquid: Evaporator Condenser Compressor Expansion valve - ANS- Condenser Which of the following is not most effective way to detect the general area of a small leaks: fluorescent Indicator Ultrasonic tester All the options are correct Electronic tester - ANS- fluorescent Indicator During each vacuum decay test, it is observed that after creating the vacuum, the pressure of the system increases to greater than 0 psig and stops at some point, Then: Leak could not be observed Leak is observed but not refrigerant is trapped None of the answers are correct The refrigerant could be trapped in the system - ANS- The refrigerant could be trapped in the system Refrigerant cannot be called reclaimed unless it meets the ______ purity standard: ARI-700 ARI-740 ARI-360 ARI-1024 - ANS- ARI-700 One chlorine atom in stratosphere can be able to destroy approximately _______ number of ozone molecules: 100,000 10,000 1000 100 - ANS- 100,000 It is to be ensured that the refrigerant recovery cylinder is not filled to more than _____ of its capacity 90 percent 60 percent 50 percent 80 percent - ANS- 80 percent Only _____ refrigerant can be transferred or sold to another individual Disposed Reclaimed Recovered Recycled - ANS- Reclaimed Lifetime of CFCs is believed to be in the range ______ : Above 1000 years 5 to 10 years 100 to 500 years 20 to 100 years - ANS- 20 to 100 years EPA has divided refrigerated appliances into _____ groups Six Three Four Five - ANS- Five Which of the following substance present in refrigerant appliance results in corrosion: Can be either acidic and basic Basic Acidic - ANS- Acidic A recovery cylinder can maximum store _____ number of refrigerants: One Three Four Two - ANS- one A vacuum test could actually hide a leak: False True - ANS- True Presence of which of the following element will reduce the stability of the ozone depletion organic refrigerant compounds: Hydrogen Chlorine Bromine All options are correct - ANS- Hydrogen The ______ connects the condenser to the expansion device: Discharge line Suction line Liquid line Expansion line - ANS- Liquid Line _____ breaks down the CFCs and frees the chlorine ion at stratosphere: Ultraviolet radiation Gamma radiation Infrared radiation X-radiation - ANS- Ultraviolet Radiation Refrigeration technicians who violate the Clean Air Act may: Required to appear in federal court. All the options are correct Lose their EPA certification Be fined - ANS- All the options are correct Which type of leak detector works by drawing the vapor into the system and heating it: Fluorescent leak detector Electronic leak detector Helium leak detector Ultrasonic leak tester - ANS- Electronic leak detector The color of the pressure port of the manifold pressure gauge that is connected to the low pressure side of the system: Green Yellow Blue Red - ANS- Blue Recovered refrigerant if it is clean can be returned to the same system or other systems owned by the same person without restriction: False True - ANS- True Two refrigerants are not allowed to collect into one recovery cylinder because: Recovery back of two refrigerants from mixture is not possible Refrigerant mixture can react each other and explode Both the options are correct - ANS- Recovery back of two refrigerants from mixture is not possible R-134a belongs to which of the following refrigerant group: HFC HCFC CFC - ANS- HFC If the vacuum pump used is too large, water removal from the system will become: Easier Difficult Remains same - ANS- Difficult Motor Vehicle Air Conditioning (MVAC) service technicians are governed under EPA _____ section: 507 609 607 608 - ANS- 609 The Diameter of the liquid line must be as _____ as possible to minimize the total refrigerant pressure drop over the length of the liquid line and as ____ as possible to avoid refrigerant flash large, small small, large large, large small, small - ANS- Large, Small Recovery and recycling equipment intended for use manufactured after _____ must be certified to meet the requirements of ARI 740: Nov 15, 1993 Dec 31, 1994 Dec 31, 1995 Jan 1, 1995 - ANS- Nov 15, 1993 Which of the following is used to minimize the leakage of refrigerant while checking the pressure of the system: Hand valves Self-sealing hoses Either can be used - ANS- Either can be used This suction line filter drier should be located just upstream of the _____ inlet: Expansion valve Evaporator Condenser Compressor - ANS- Compressor Ozone is a unstable molecule at stratosphere: False True - ANS- True Which of the refrigerant is used in low pressure refrigerated appliance: R-123 R-114 R-12 R-500 - ANS- R-123 A vacuum test allows air and moisture to enter the system if there is a leak: False True - ANS- True 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 Density - Volume method All the options are correct Pressure-Temperature method - ANS- Pressure-Temperature method Nitrogen reacts with hydrogen to form which of the following: Nitrogen Hydride Ammonia Nitrogen does not react with hydrogen Nitrogen Hydroxide - ANS- Ammonia The pressure of Nitrogen at which that is introduced into the evacuation system after evacuation of refrigerant is: Equal the atmospheric pressure Slightly above than the atmospheric pressure Any atmospheric pressure Slightly lower than the atmospheric pressure - ANS- Slightly above than the atmospheric pressure CFCs are highly reactive in lower levels of atmosphere: False True - ANS- False Process involved for Reclaimation and Recycling of refrigerants are same: True False - ANS- False CFC-11 and CFC-12 Ozone depleting substances contributes ______ of stratospheric chlorine 82% 18% 51% 70% - ANS- 51% Montreal Protocol is signed in which of the following year: 1995 1994 1987 2000 - ANS- 1987 Low-pressure systems typically have a pressure relief valve set at ____ : 25 psi 10 psi 20 psi 15 psi - ANS- 15 PSI ______ refrigerant can be transferred to another owner: Renewed Recycled Recovered Reclaimed - ANS- Reclaimed which one of the following has Ozone Depletion Potential (ODP) value of 1: HCFC-23 CFC-11 HCFC-22 CFC-12 - ANS- CFC-11 ____ recovery is the fastest and takes up less volume per pound of refrigerant to recover: Liquid Neither Liquid nor Gas Either Liquid and Gas Gas - ANS- Liquid Long hoses between the unit and the recovery machine results in _______ in recovery time: Has no impact on length of hoses Increase Decrease - ANS- Increase Reusable containers for refrigerants shall be tested for hydrostatically tested and date stamped for every _____ : 2 Years 1 Year 3 Years 5 Years - ANS- 5 Years Which of the following refrigerant is used in very high pressure appliance: R-503 R-410A R-500 R-22 - ANS- R-503 The purged nitrogen gas shall be: Vented to atmosphere Evacuated in to separate container and is disposed Evacuated in to separate container and send to EPA Evacuated in to separate container and is recycled - ANS- Vented to atmosphere Which of the following device is located at the end of the liquid line: Condenser Compressor Evaporator Expansion device - ANS- Expansion device Dehydration evacuation will never remove mineral oil or the acid trapped in the oil: True False - ANS- True Flushing agents shall not be introduced into which of the following in a refrigeration system: Condenser Compressor Condenser lines Evaporator - ANS- Compressor At which of the following stage of the refrigeration system the refrigerant is in Warm liquid: Expansion line Suction line Discharge line Liquid Line - ANS- Liquid Line According to EPA requirements, systems that contain _____ or more of refrigerant to have "substantial leaks" repaired within 30 days. 50 pounds 100 pounds 25 pounds 10 pounds - ANS- 50 Pounds Suction line in refrigeration system consist of which of the following: Cold water Warm liquid Hot vapor Cool vapor - ANS- Cool Vapor ______ is used to the push-pull recovery method of refrigeration: Dual-valve recovery tank Triple-valve recovery tank Quadruple recovery tank Single valve recovery tank - ANS- Dual-valve recovery tank Oil is used in compressor for which of the following purpose: seal the moving parts of a compressor lubrication Both the options are correct - ANS- Both the options are correct All Refrigerant Oils are Hygroscopic: True False - ANS- True When ozone reacts with chlorine ion which of the following is obtained: All the options are correct HCl Oxygen Fluorine - ANS- Oxygen When evacuation of the refrigerant, larger the diameter of the suction hoses, _____ will be recovery rate of the refrigerant: Slower Faster - ANS- Faster Disposable cylinders are used only for which of the following refrigerant: Virgin refrigerant Recovery refrigerant Either virgin or recovery refrigerant - ANS- Virgin refrigerant Which of the following is formed when refrigerants exposed to flames or steam which is poisonous: Phosgene gas Carbonyl halides Hydrofluoric All the options are correct - ANS- All the options are correct When checking for small leaks, using a ____ is the most effective method: Halide torch Fluorescent dye indicator Visual oil-soluble dye indicator All the options are correct - ANS- All the options are correct If icing occurs on the sight glass, which of the following is used to remove the ice: liquid ammonia QwikShot acid flush liquid nitrogen alcohol spray - ANS- Alcohol Spray Only CFCs and HCFCs refrigerants are to be mandatorily recovered: True False - ANS- False Stratosphere layer consists of ____ of the available Ozone on the earth's atmosphere: 90% 50% 70% 20% - ANS- 90% Which of the following when mixed with refrigerants cannot cause an explosion: Compressed nitrogen Oxygen Compressed air Compressed hydrogen - ANS- Compressed nitrogen Mixed refrigerants in the same tank may be impossible to reclaim: True False - ANS- True Refrigerant in Discharge Line will be in which of the following phase: Hot vapor Cold vapor Cold liquid Hot liquid - ANS- Hot Vapor Schrader valves are present on which of the following: Both the options are correct Recovery equipment. Refrigerant systems - ANS- Both the options are correct For obtaining the most accurate readings during evacuation process, the vacuum gauge should be located as ____ as possible from the vacuum pump: Distance between vacuum pump and vacuum gauge does not have any effect Near Far - ANS- Near Which one of the following has minimal ozone depletion potential: HFC HCFC All will have same depletion potential CFC - ANS- HFC The center port of the service manifold is usually have ______ hose: red blue green yellow - ANS- Yellow Which of the following refrigerant is used in medium pressure appliance: R-500 R-11 R-503 R-410A - ANS- R-500 The warmer the temperature of the refrigeration system, the slower it will evacuate: False True - ANS- False 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: Expansion valve compressor Condenser Evaporator - ANS- Compressor Stratosphere extends about _____ from the earth's surface - ANS- 30 Miles Montreal Protocol is substantially amended in which of the following year: 1992 1995 1994 2000 - ANS- 1992 The compound gauge of gauge manifold set measures which of the following: Low pressure High pressure Discharge pressure All the options are correct - ANS- Low Pressure To _____ is to clean refrigerant for immediate reuse: Recover Reclaim Recycle - ANS- Recycle _______ of stratospheric chlorine comes from ozone-depleting substances: 51% 82% 18% 72% - ANS- 82% Which of the following not correct with reference to three 'R' s: Recycle Re-use Recovery Reclaim - ANS- Re-Use 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-116 R-124 R-123 R-410a - ANS- R-410A R-22 belongs to which of the following refrigerant group: None of the above CFC HFC HCFC - ANS- HCFC The smallest cylinder a 608-certified technician may purchase is ______: 20 pounds 25 pounds 15 pounds 50 pounds - ANS- 20 Pounds The rise in the amount of chlorine measured in the stratosphere over the past two decades matches the rise in the which of the following element: Fluorine Hydrogen Oxygen Nitrogen - ANS- Fluorine ______ leak detector listens for the noise of gas leakage: Ultrasonic leak tester Helium leak detector Fluorescent leak detector Vacuum leak detector - ANS- Ultrasonic If the refrigerant system compared to cylinder is warmer, then the refrigerant recovery rate will be: Faster Slower Independent - ANS- Faster R-134a refrigerant is used in which of the following appliance: High pressure appliance Low pressure appliance Medium pressure appliance - ANS- High Pressure Appliance An award of up to ______ is offered by the EPA to those individuals who supply information against a technician who intentionally vents Refrigerants to atmosphere: $ 35,000 $ 10,000 $ 27,500 $ 5000 - ANS- $10,000 Condenser is present in which of the following refrigeration cycle: Low pressure side High pressure side - ANS- High Pressure Side Which of the following gas is used to determine the leak in the system: Carbondioxide Nitrogen Oxygen Hydrogen - ANS- Nitrogen Which of the following is the responsibilities of the Clean Air Act: Set dates to phase out of CFCs and HCFCs Disposal requirements All the options are correct Prohibit venting - ANS- All the options are correct Refrigerants in Suction line will be in which of the following phase: Cold liquid Low pressure vapor High pressure vapor Warm liquid - ANS- Low Pressure Vapor Ternary blend refrigerant consists of ______ mixture of refrigerants: Five Two Four Three - ANS- Three The ______ occurs when the saturation temperature in the evaporator causes the refrigerant to change from a liquid to a vapor Dew point Saturation point Bubble point Evaporation point - ANS- Dew Point Which one the of the following refrigerants contribute to global warming: HCF HCFC CFC All the mentioned refrigerants contributes - ANS- All the mentioned refrigerants contributes The fastest way to dehydrate a system is with which of the following: Triple Evacuation Method Dual Evacuation Method Quadruple Evacuation Method All options are correct - ANS- Triple Evacuation Method Only cylinders designated as "refillable" by the _______ can be used for refrigerant recovery: EPA Department of Transportation (DOT) Clean Air Act (CAA) ASHRAE - ANS- Department of Transportation (DOT) ______ nitrogen is used to pressurize the system: Either Liquid or Gaseous Gaseous Liquid - ANS- Gaseous Halide torch is the most effective method for checking the small leaks: False True - ANS- True Smaller the refrigerant system size, ______ will be the Refrigerant Recovery Rate: Faster Slower - ANS- Faster Ban on the production or import of any HCFC refrigerant will take effect from _____. 2015 2020 2024 2018 - ANS- 2020 Montreal Protocol agreement is not called for a phase out of following refrigerants: HFCs Halons HCFCs CFCs - ANS- HFCs An electronic leak detector can detect leak rates of about ____ per year: 0.5 oz 10 oz 20 oz 0.1 oz - ANS- 0.5oz The scale on the high pressure of gauge manifold is calibrated in the range: 0 to 100 psi 0 to 500 psi 0 to 1000 psi 0 to 200 psi - ANS- 0 to 500 PSI Vacuum lines (hoses) of the evacuation system should be equal to or larger than the pump intake connection False True - ANS- True UV radiation can cause which of the following: 1) Suppression of the immune system 2) Increase in skin cancers and cataracts Which of the following options is / are correct: Only option (1) is Correct Only option (2) is Correct Both option (1) and (2) are Correct Neither option (1) and (2) are Correct - ANS- Both option (1) and (2) are Correct Recovery is done in order to have which of the following: Prevent venting to the atmosphere Adequate supplies for service after production bans All options are correct Prevent stratospheric ozone depletion - ANS- All options are correct Refrigerants will be of high pressure hot vapor phase in which of the following: Suction line Expansion line Liquid line Discharge line - ANS- Discharge line When checking for leaks in a system, which of the following gas is used: Nitrogen Oxygen Compressed air Hydrogen - ANS- Nitrogen Which one of the following is HCFC refrigerant: R-410a R-113 R-11 R-22 - ANS- R-22 Reclaimed refrigerant must meet the standard set forth in _____ before it can be resold ARI 500 ARI 700 ARI 740 ARI 1000 - ANS- ARI-700 Many refillable cylinders have which of following for automatically shut the system off when the storage tank level reaches above 80% level: Internal magnetic-reed float valves Electronic shut-off device Either of the options are correct - ANS- Either of the options are correct Evaporator is located in which part of the refrigeration cycle: Low pressure side High pressure side - ANS- Low Pressure Disposable cylinders consists of which of the following: Will have no valves Two way valve One-way valve Three way valve - ANS- One Way Valve Upon leaving the evaporator, the refrigerant is at which of the following phase: Low pressure, low temperature vapor High pressure, high temperature liquid High pressure, high temperature vapor Low pressure, low temperature liquid - ANS- Low pressure, low temperature vapor Tendency to leak of the refrigerant depends on which of the following: Molecular weight Viscosity Specific heat Compressibility - ANS- Molecular weight Ozone Depletion Potential of CFCs is higher than HCFCs False True - ANS- True 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 60 pounds 20 pounds 50 pounds 40 pounds - ANS- 50 Pounds 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 - ANS- All the options are correct As the pressure on the refrigeration liquid increases, boiling point of the refrigeration liquid: Increases Decreases Remains unaltered - ANS- Increases The condenser rejects the heat from the system: True False - ANS- True _____ is the amount of heat required to change the refrigerant from a liquid to a gas: Total heat Enthalpy Sensible heat Latent heat - ANS- Latent Heat HCFC ban will extend to all HCFCs for use in new systems will effect from which year: January 1, 2020 January 1, 2018 January 1, 2018 January 1, 2015 - ANS- January 1, 2015 HFCs are highly stable in lower part of the atmosphere: True False - ANS- False The temperature at which the refrigerant starts to evaporate is: Bubble point Condensing point Saturation point Dew point - ANS- Bubble Point Which of the following has very low molecular weight: Oxygen Helium Carbon-dioxide Nitrogen - ANS- Helium High pressure gauge of gauge manifold will have which of the following color: Red Blue Green Yellow - ANS- Red Which of the following is not a desirable properties of a good refrigerant: High miscibility with lubricating oil Low specific heat High latent heat value High boiling point - ANS- High Boiling Point Nitrogen constitutes ______ of the earth's atmosphere: 75% 85% 78% 66% - ANS- 78% As per the EPA, a substantial leak is a leak of ____ per year or more of the normal charge for industrial process and commercial refrigeration systems: 35 % 15 % 50 % 20 % - ANS- 35% Atmospheric pressure is ______ pounds per square inch: 147 14.7 1.470 1470 - ANS- 14.7 According to Clean Air Act (CAA), R-22 must be: Destroyed All the options are correct Recovered and Recycled Reclaimed - ANS- All the options are correct In Halide torch leak test if there is a refrigerant leak, the flame will turn: Red Green Blue Yellow - ANS- Green R-500 Refrigerant is which of the following: HCFCs HCFs CFCs - ANS- CFCs Refrigerant will be in _____ phase in suction line: Hot vapor Cold vapor Warm liquid Cold liquid - ANS- Cold Vapor During vacuum leak test, if the measured pressure increases ______ after a while, then it can be determined that refrigerant is still trapped in the system: less than 0 psig equal to 0 psig above 0 psig - ANS- above 0 psig Which of the following gas is used for holding charges or as leak test gases may be released: Compressed air Oxygen Nitrogen Hydrogen - ANS- Nitrogen Which of the following has the ozone depletion potential of 1: R-11 R-12 R-22 R-23 - ANS- R-11 Natural refrigerants such as carbon dioxide and hydro carbons (propane) have high Global Warming Potential (GWP) compared to HFCs False True - ANS- False ______ 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 trioxide Chlorine dioxide Chlorine monoxide Chlorine oxide - ANS- Chlorine monoxide _____ of stratospheric chlorine is contribution from natural sources such as volcano eruptions and others: 35% 18% 30% 40% - ANS- 18% Asphyxia is a condition caused because of lack of which of following: Oxygen Air Carbon dioxide Hydrogen - ANS- Oxygen _____ is the reaction of refrigerant with water: Hydrolysis Electrolysis distillation Aquesition - ANS- Hydrolysis After _____, the servicing of R-22-based systems will rely on recycled refrigerants: 1st Jan, 2022 1st Jan, 2020 1st Jan, 2018 1st Jan, 2015 - ANS- 1st Jan, 2020 Recovery cylinders are designed for refilling: False True - ANS- True Refrigerant in Condenser will be in which of the following phase: Low pressure vapour High pressure vapour Low pressure liquid High pressure liquid - ANS- High Pressure Liquid Since _______, knowingly venting any refrigerant is a violation of CAA: Nov 15, 1995 Nov 30, 1995 Dec 31, 1996 Jan 1, 1997 - ANS- Nov 15, 1995 The warmer the temperature of the refrigerant, the _____ will be evacuation of the refrigerant from the refrigeration system faster Will have no effect slower - ANS- Faster To _______ is a process in which refrigerant to the level of new product specifications as determined by chemical analysis: Recover Recycle Reclaim - ANS- Reclaim The compound gauge is usually ______ in color and measures low pressure and vacuum: Green Blue Red Yellow - ANS- Blue As per CAA, improper record keeping is subjected to a penalty fine of ______ per day per violation: $ 37,500 $ 22,500 $ 32,500 $ 10,000 - ANS- $37,500 The relief valves present in the refrigeration system shall be in which of the following configuration: Either Series or Parallel Parallel Series - ANS- Parallel An overfilled cylinder may result in rise of which of the following when exposed to heat may lead to explosion: All the options are correct Pressure Density Volume - ANS- Pressure The temperature at which non azeotropic blend first begins to condense: Saturation point Dew Point Bubble point Sensible point - ANS- Dew point Class I Refrigerants will have a ozone depletion potential greater than: 1 2 0.8 0.2 - ANS- 0.2 HFC refrigerants have Zero Ozone Depletion Potential & Zero Global Warming Potential: False True - ANS- False The ozone layer in the stratosphere extends up-to ______ miles above the earth's surface: 10 miles 30 miles 50 miles 70 miles - ANS- 30 Refrigerants represented by letter _____ will have higher Toxicity: A B C D - ANS- B The amount of heat added to the refrigerant in condenser to make it saturated and change its state is: Sensible heat Total heat Super heat Latent heat - ANS- Superheat The more the moisture in the refrigeration system, the _____ it will take for the refrigerant to evacuate: Moisture will have no effect Shorter Longer - ANS- Longer Refrigerant oil must be miscible at high temperature: False True - ANS- False CFCs are phased out on ________ : Jan 1, 1996 Dec 31, 1996 Jan 1, 1995 Dec 31, 1995 - ANS- Dec 31, 1995 In Halide torch test, refrigerant air is drawn over ______ element heated by hydrocarbon fuel: Copper Silver Tungsten Nickel - ANS- Copper Which one of the following has least ozone depletion potential: Class III refrigerant Class I refigerant Class II refrigerant Class IV refrigerant - ANS- Class II refrigerant Which of the following process is associated with cleaning the refrigerants for immediate use by removing oil, moisture and acidity from the refrigerant by using filter driers: Recycle Reclaim Recover Reuse - ANS- Recycle Which of the following compound is obtained when chlorine atom reacts with ozone molecule: Chlorine peroxide Chlorine Monoxide Chlorine oxide Chlorine dioxide - ANS- Chlorine Monoxide Which of the following is the example of HFC: R-500 R-22 R-134a R-123 - ANS- R-134a Reclaimed refrigerant must meet the standard set forth in _______ before it can be resold: ASHRAE 1000 ASHRAE 700 ARI 1000 ARI 700 - ANS- ARI-700 CFCs and HCFCs must be recovered before opening a system for service: False True - ANS- True Which of the following is not the results of stratospheric ozone depletion: Reduced Marine Life Skin Cancer Reforestation Crop loss - ANS- Reforestation Asphyxia is the phenomenon in which _______ in the blood caused by respiratory interference: Lack of Nitrogen Lack of oxygen Lack of Carbon dioxide Lack of Refrigerant - ANS- Lack of oxygen 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 - ANS- False Ozone at ground level is considered as bad and pollutant: False True - ANS- True The colder the ambient temperature, the ______ the recovery process of the refrigerants: temperature will not have impact on recovery rate Shorter Longer - ANS- Longer Heated refrigeration system during evacuation will ______ dehydration time decrease increase will not have any effect - ANS- decrease As per the Montreal Protocol, CFC's were phased out of production on _____: November 14, 1994 December 31, 1995 November 14, 1995 December 31, 1994 - ANS- December 31, 1995 R-134A have _______ Ozone Depletion Potential unity zero low high - ANS- zero A single Chlorine atom can destroy ______ Ozone molecules 1000 100,000 1,000,000 10,000 - ANS- 100,000 Service technicians who violate Clean Air Act provisions may be: lose their certification fined All the options are correct may be required to appear in Federal court - ANS- All the options are correct The lower the ambient temperature, the ____ the recovery rate faster slower - ANS- Slower Hygroscopic oil has a high affinity for water False True - ANS- True Recovery cylinders are not specifically designed to be refilled True False - ANS- False Strong odor is detected during the recovery process represent burn-out of which of the following: all the options are correct compressor evaporator condenser - ANS- Compressor Which of the following refrigerant recovery method is faster: Vapor Only Liquid Only - ANS- Liquid Only Ozone helps in maintaining stable earth temperature False True - ANS- True The Montreal Protocol entered into force in mid ______: 1988 1992 1991 1987 - ANS- 1987 The rise in the amount of Chlorine measured in the stratosphere over the past two decades matches the rise in the amount of _______: Iodine Fluorine Hydrogen Bromine - ANS- Fluorine Stratospheric Ozone depletion is ______ problem Asia Antarctica Global North America - ANS- Global To ________ is to process refrigerant to a level equal to new (virgin) product specifications as determined by chemical analysis. Reclaim Recycle Recover Repair - ANS- Reclaim Recovery cylinders have how many port(s) 4 3 1 2 - ANS- 2 Ozone at Stratosphere protects us from Sun's harmful _______ both options are correct infrared radiation ultraviolet radiation - ANS- ultraviolet radiation Stratosphere is located between ______ above the sea level 90 and 120 miles 60 and 90 miles 30 and 60 miles 10 and 30 miles - ANS- 10 and 30 miles Refrigeration Cylinders should not be transported in an upright position True False - ANS- False Refrigerants are generally ______ than air: Heavier Lighter - ANS- Heavier If moisture is allowed to remain in an operating refrigeration system which of the following is formed: hydrochloric acid both the options are correct hydrofluoric acid - ANS- both the options are correct An azeotrope mixture does not have a temperature glide True False - ANS- True Which of the following is used for pinpoint the leak in the refrigeration system: Soap bubbles electronic leak detector ultrasonic leak detector - ANS- Soap Bubbles Technicians certified under Clean Air Act, Section 609 are allowed to purchase R-12 in containers smaller than ______: - ANS- 20 Pounds A bounty of up to ________ will be awarded for a person who gives details of intentional venting of refrigerants to atmosphere: $10,000 $27,500 $15,000 $12,500 - ANS- $10,000 Refillable cylinders which are at high pressure under ambient temperature must be hydrostatically tested and date stamped every ______ years: 1.5 2 3 5 - ANS- 5 Pressure Relief valves must be installed in which of the following arrangement Either series or parallel Parallel Series - ANS- Parallel R-134a is most common replacement for which of the following refrigerant: R-22 R-123 R-11 R-12 - ANS- R-12 A ______ drier should be installed to trap any debris that may damage the compressor: vapor line filter liquid line filter suction line filter discharge line filter - ANS- suction line filter The factors affecting the speed and efficiency of evacuation are: size of equipment being evacuated the size of the vacuum pump and suction line ambient temperature All the options are correct amount of moisture in the system - ANS- All the options are correct Vacuum lines should be ______ the pump intake connection larger than smaller than equal to or smaller than equal to or larger than - ANS- equal to or larger than Approved refrigerant recovery cylinders can easily be identified by which of the following colors: Yellow Tops and Blue Bodies Blue Tops and Yellow Bodies Yellow Tops and Gray Bodies Gray Tops and Yellow Bodies - ANS- Yellow Tops and Gray Bodies Recovery cylinders are used only with virgin refrigerant: True False - ANS- False The ______ will collide with another Ozone molecule, release its Oxygen atom: Chlorine Pent-oxide Chlorine Dioxide Chlorine Monoxide Chlorine Peroxide - ANS- Chlorine Monoxide The refrigerant components present in the blended refrigerant will leak from the system while charging at uneven rates due to different: Volumetric Pressures All the options are correct Vapor Pressures Dynamic Pressures - ANS- Vapor Pressures An ozone molecule consists of _____ oxygen atoms 4 1 2 3 - ANS- 3 It is the responsibility of the final person in the disposal chain to ensure that refrigerant has been removed from appliances before scrapping False True - ANS- True Refillable cylinders used for transporting recovered pressurized refrigerant must be approved by: DOT EPA ASHRAE ARI - ANS- DOT To _________ the refrigerant is to remove refrigerant in any condition from a system and store it in an external container Recover Reclaim Recycle Restore - ANS- Recover Refillable refrigerant cylinder must not be filled beyond _______ of its capacity by weight 75% 90% 95% 80% - ANS- 80% Long hoses will cause excessive pressure drop: False True - ANS- True Most refrigerant oils are not hygroscopic False True - ANS- False At high temperatures R-12 and R-22 decompose to form which of the following: Hydrochloric acid Hydrofluoric acid Phosgene gas All the options are correct - ANS- All the options are correct When leak testing an R-134A system which of the following is used: pressurized hydrogen all the options are correct pressurized nitrogen pressurized air - ANS- Pressurized Nitrogen A two-stage vacuum pump is necessary to pull the deep vacuums generally below: - ANS- 500 microns A Zeotrope refrigerant mixture will not have temperature glide: - ANS- False The oils used in most R-134A refrigeration systems are ESTERS - ANS- True Measuring a systems vacuum should be done with the system isolated: - ANS- True After recovering refrigerant, if nitrogen is used to flush debris out of the system, the nitrogen may not be legally vented - ANS- False Volcanoes contribute large quantity of Chlorine as compared to CFC's however it is dissolves with water and comes down with rain: - ANS- False The stratospheric layer above the earth's surface contains _____ ozone gas - ANS- 90% When virgin supplies of CFC's are depleted, future supplies will come from ______ refrigerants: - ANS- recycled recovered reclaimed The instability of the ozone molecule allows free oxygen atoms to react easily with which of the following: - ANS- Nitrogen Chlorine Bromine Montreal Protocol regulates the production and use of which of the following: - ANS- Methyl Chloroform The piping connection to the vacuum pump should be as short a length as possible - ANS- True Which of the following is highly stable at lower atmosphere: - ANS- CFCs Badly contaminated and mixed refrigerants in cylinder must be: - ANS- Destroyed Asphyxia is the lack of ________: - ANS- Oxygen In order to determine the general area of a leak which of the following is used: - ANS- ultrasonic leak detector an electronic leak detector 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 - ANS- Recycle The piping connection to the vacuum pump should be as large in diameter as possible: - ANS- True The system vacuum gauge should be connected as far as possible from the vacuum pump - ANS- True Short hoses results in increased recovery time: - ANS- False Reclaimed supplies of CFCs are still available - ANS- True Vent CFC's or HCFC's into the atmosphere is banned since ______ - ANS- July 1, 1992 Class II refrigerants have ozone depletion potential (ODP) less than _____: - ANS- 0.2 The Clean Air Act has been responsible for prohibiting the venting of refrigerants - ANS- True Refrigerant cylinder may be heated with an open flame during recovery: - ANS- False Inhaling refrigerant vapors or mist may cause which of the following: - ANS- Unconsciousness Oxygen deprivation Heart irregularities Different refrigerants may be mixed in the same recovery tank but not in disposal tank: - ANS- False Only technicians certified under Clean Air Act Section 609 are allowed to purchase refrigerants in containers smaller than _______ 10 lbs 25 lbs 20 lbs 15 lbs - ANS- 20 Pounds Leak rate of an appliance is losing refrigerant, projected over the next ___ months: - ANS- 12 ______ recovery equipment can only be used on appliances with 15 pounds or less of refrigerant: - ANS- Self-Dependent When mixed with refrigerants oxygen or compressed air can cause an explosion - ANS- True