EPA 608 Certification, Test Questions With Correct Answers | Latest Update2023/2024 (Graded A+)

November 14, 1994 - ANSWER What date was the sale of CFC's & HCFC's restricted to technicians certified in refrigerant recovery? oxygen atom from the ozone. - ANSWER When a chlorine atom meets with an ozone molecule, it takes one _______ CFC - ANSWER R-11 is a: HFC - ANSWER R-134A is a: destroy the ozone. - ANSWER ODP is a measurement of CFCs and HCFCs ability to __________ recovered. - ANSWER To take refrigerant out of a system, it must be ________ Gray - ANSWER The body of a recovery cylinder must be in what color? Perform sealed system service. - ANSWER Technicians servicing small appliances must be certified in refrigerant recovery if they: Products manufactured, charged, and hermetically sealed in a factory with 5 pounds of refrigerant or less. - ANSWER The EPA definition of a small appliance includes: Low loss fittings that can be manually closed or close automatically when hose are disconnected to minimize the refrigerant loss. - ANSWER All equipment must be equipped with what type of fittings? Leaks should be repaired whenever possible. - ANSWER What is the EPA requirement for leak repair for small appliances? The type of refrigerant that is in the system. - ANSWER Before beginning a refrigerant recovery procedure, it is necessary to know: refine to new refrigerant specifications. - ANSWER If a reclamation facility receives a tank of refrigerant, they will ________ Stable, known temperature. - ANSWER The only way to measure refrigerant pressure temperature relationship accurately, is at a: pressurized with an inert gas (nitrogen) and leak checked. - ANSWER After the installation of any type of system, the unit should first be _____ receiver/storage tank. - ANSWER When performing refrigerant system service on a unit that has a receiver/storage tank, refrigerant should be placed in the _____ reduce recovery time. - ANSWER Although recovering refrigerant in the vapor phase will minimize the loss of oil, recovering as much as possible in the liquid phase will _______ Returned to the appliance from which it was removed or to another appliance owned by the same person without being recycled or reclaimed. - ANSWER After recovery, refrigerant may be: Discarded. - ANSWER Disposable cylinders must be: Oil and filter. - ANSWER It is necessary to frequently check and change the recycling machine's: minimize refrigerant release when hoses are connected/disconnected. - ANSWER Quick couplers, self-sealing hoses, and hand valves should be used to _____ an auxiliary heat exchanger coil. - ANSWER A major repair involves removal of _______ cause air and moisture to enter the system. - ANSWER Because a low-pressure system operates below atmospheric pressure (vacuum), leaks in the gasket or fittings will _______ Controlled hot water - ANSWER What can be used to pressurize a system for the purpose of opening the system for a non-major repair? (Type III) 10 psig when evacuating the refrigerant from a low pressure chiller (rupture disc at 15psig) - ANSWER A recovery unit's high pressure cut-out is set for (Psig for Type III): 100 pounds of vapor - ANSWER A substantial amount of vapor will remain in the appliance after all the liquid is removed. An average 350 ton R-11 chiller at 0 psig still contains what amount of vapor? 130 degrees F - ANSWER When removing oil from a low-pressure system, a temperature of what must be attained? Liquid removal, followed by vapor. - ANSWER Refrigerant recovery from a system using R-11 or R-123 starts with recovery of (Type III): freezing of the water. - ANSWER Water must be circulated through the tubes when evacuating refrigerant in order to prevent ________ municipal water supply. - ANSWER Most low-pressure recovery machines utilize a water-cooled condenser that is connected to the ________ 16.9" hg. vacuum or 36 degrees F. - ANSWER Before charging with liquid, how much pressure does an R-11 refrigeration system require (vapor pressure), and how much saturation temperature? Recovering two refrigerants back from mixture is not possible - ANSWER Two refrigerants are not allowed to collect into one recovery cylinder because: R-123 Low pressure appliances uses a refrigerant with a liquid phase saturation pressure below 45 psia at 104°F. - ANSWER What is one refrigerant used in low pressure refrigerated appliances? Ammonia. - ANSWER Nitrogen reacts with hydrogen to form what? Liquid line - ANSWER The ______ connects the condenser to the expansion device: Nov 15, 1993 - ANSWER Recovery and recycling equipment intended for use manufactured after _____ must be certified to meet the requirements of ARI 740. Electronic leak detector Electronic leak detector works on the principle that when halogen vapor is heated, it increases the positive ion concentration thereby increasing the conductivity of the air sample drawn between the ion emitter and collector (anode and cathode). This increase in positive ion conductivity is magnified using electrical circuit so that audio or visual signal is produced. - ANSWER Which type of leak detector works by drawing the vapor into the system and heating it? Ultraviolet radiation - ANSWER _____ breaks down the CFCs and frees the chlorine ion at stratosphere: More difficult. If large vacuum pump is used, vacuum in the system drops very fast causing the evaporating water to cool and freeze rapidly. This results in removing water from the system more difficult. - ANSWER If the vacuum pump used is too large, water removal from the system will become easier or more difficult? 609 - ANSWER Motor Vehicle Air Conditioning (MVAC) service technicians are governed under EPA _____ section: True Ozone at stratosphere is an unstable molecule made up of three oxygen atoms. The instability of the molecule allows the free oxygen atoms to react with hydrogen, nitrogen, chlorine and bromine. - ANSWER Ozone is a unstable molecule at stratosphere: T or F? Hydrogen Chlorine and Bromine are considered as the elements responsible for the depletion of ozone layer at stratosphere. CFC compound are highly stable at lower atmosphere and have higher lifetime. Therefore they reach stratosphere and depletes the ozone layer. Presence of Hydrogen element in organic refrigerants such as HCFCs and HFCs results in decomposition at lower atmosphere. Therefore these elements have lower lifetime and cannot pose threat to ozone depletion. - ANSWER Presence of which of the following elements will reduce the stability of the ozone depletion organic refrigerant compounds: Chlorine Bromine Hydrogen All of the Above Pressure-Temperature method Saturated refrigerants have a specific pressure rating at a specific temperature. If both these parameters are measured, correct refrigerant can be determined by looking at pressure-temperature chart - ANSWER If the label identifying the refrigerant is missing, then which method is used to identify the type of refrigerant? Temperature - ANSWER References to the pressure/temperature chart for determining the type of refrigerant are only valid if the _____ is known: HFC - ANSWER Sale of which of the following refrigerants are not limited to technicians: HCFC HFC CFC All the refrigerants are restricted Both Oil level and Refrigerant leaks - ANSWER All refrigerant recovery equipment should be checked for _____ on a daily basis: 10 - ANSWER Typical AC compressors are limited to about _______ tons of cooling capacity both pressure and temperature - ANSWER The amount of refrigerant that is absorbed in the oil is affected by which of the following: pressure alone temperature alone both pressure and temperature Filter Drier - ANSWER Moisture indicating sight glass is located downstream of the which of the following: Filter Drier Expansion Valve Compressor Condenser 500 microns - ANSWER When evacuating a system, it is required that the vacuum pump pull a minimum of _____ microns. High-Pressure Liquid - ANSWER The state of the refrigerant leaving the liquid receiver of a refrigeration system is a High-pressure gas High-pressure liquid Low-pressure gas Low-pressure liquid False - ANSWER The liquid receiver is NOT part of the low side of the system. T or F False - ANSWER Hermetic compressor can be operated when the system is under a deep vacuum. T or F Both High Superheat and Oil Traces - ANSWER Which of the following are the indications that a high pressure system has a leak: High Superheat Oil Traces Both of the above True - ANSWER When servicing an open refrigeration system, filter drier shall be always replaced: T or F Oxygen depletion - ANSWER A sensor and alarm are required for A1 (R-12, R-22) refrigerant as defined by ASHRAE is to sense: Low - ANSWER If refrigerant seen at liquid-line sight glass contains bubbles then , the charge is probably ________ DOT - ANSWER All refrigeration recovery cylinders must be _____ approved: Liquid - ANSWER When recovering R-11 and R-23 from a low pressure system, in order to reduce the time of recovery it has to be recovered in what state? 25mm - ANSWER When using recovery or recycling equipment manufactured or imported on or after Nov 15, 1993, the required level of evacuation for low pressure equipment is _____ Hg absolute: Reciprocating - ANSWER Open-drive compressors are typically _____ compressors Condenser - ANSWER The purge unit takes its suction from the top of the ____ 35% - ANSWER The EPA requires that all commercial and industrial process refrigeration systems with more than 50lb of refrigerant be repaired when the annual leak rate exceeds ______% Convex - ANSWER Reverse-acting rupture discs, which are installed with the process pressure against the ______ side of the disc. Convex or Concave? 3 - ANSWER Every ______ months or as required by the manufacturer of your unit, check the recovery or recycling unit for leaks. 580 - ANSWER To ensure the purge unit will perform to its published efficiency rating, verify the unit is ARI-certified to Standard _____ Bubble Point - ANSWER The temperature at which the non-azeotropic blend first begins to evaporate? All of the options are correct - ANSWER A halogenated hydrocarbon contains which of the following halogens: All the options are correct Fluorine Chlorine Bromine False - ANSWER Chillers will not be low pressure appliances. T or F 0.2 - ANSWER Class I refrigerants have an ozone depletion potential (ODP) greater than 0.2 - ANSWER Class II refrigerants have an ozone depletion potential (ODP) less than ___ Oxygen - ANSWER 'Asphyxia' refers to displacement of which gas by the denser refrigerant: Isomer - ANSWER One of a group of substances having the same combination of elements but arranged spatially in different ways: 12 - ANSWER Leak Rate refers to the rate at which an appliance is losing refrigerant, projected over the period of _____ months: True - ANSWER Hygroscopic oils readily absorb moisture. T or F Upstream - ANSWER Electronic Expansion Valve (EEV) is a throttling device located _____ of the evaporator. Upstream or downstream? Upstream - ANSWER Thermal Expansion Valve (TXV) is a throttling device located _____ of the evaporator. Upstream or downstream? 500 to 2,000 microns - ANSWER In Triple evacuation method, the system is evacuated initially to a vacuum of at least _____ microns. 45 psia and 170 psia - ANSWER Medium-pressure appliances use a refrigerant with a liquid phase saturation pressure between _____ at 104°F: 45 psia - ANSWER Low-pressure appliance uses a refrigerant with a liquid phase saturation pressure below _____ at 104°F: 355 psia - ANSWER Very high-pressure appliance uses a refrigerant with liquid phase saturation pressure above _____ at 104°F: True - ANSWER Vacuum pumps are rated by their volumetric capacity, which is typically expressed in CFM. T or F R-12 - ANSWER Medium-pressure appliance can use which of the following refrigerants: R-12 R-22 R-123 R-11 Multiply, Subtract To convert from inches of Mercury to Millimeters of Mercury Absolute, Multiply the inches of mercury by 25.4 and Subtract the result from 760. Millimeters= 760 - (inches x 25.4) - ANSWER To Convert From Inches of Mercury To Millimeters of Mercury Absolute ____ the Inches of Mercury by 25.4 and ____ the result from 760 Divide, Subract Multiply, Add Multiply, Subtract Divide, Add Subtract - ANSWER To Convert From PSIA To PSIG _____ 14.7 to the PSIA reading. Subtract Add 1/1,000 - ANSWER Micron is _____ of a millimeter of mercury vacuum The displacement of oxygen in a room by the denser refrigerant. - ANSWER Asphyxia A blend of two or more components whose equilibrium vapor phase and liquid phase composition are the same at a given pressure. These refrigerants are given a 500-series ASHRAE designation and behave like a single refrigerant. They can be charged as a liquid or vapor. - ANSWER Azeotrope The temperature at which the non-azeotropic blend first begins to evaporate (boil). - ANSWER Bubble Point A passive throttling device comprised of a very small diameter long tube located upstream of the evaporator that drops the pressure in the system, causing refrigerant to flash into a two- phase mixture. It does not actively control the pressure drop to maintain a prescribed superheat at the exit of the evaporator. - ANSWER Capillary Tube Any device that contains and uses a refrigerant for household or commercial purposes, including any air conditioner, refrigerant, chiller, or freezer. EPA interprets this definition to include all air-conditioning and refrigeration equipment except units designed and uses exclusively for military purposes. - ANSWER Appliance Refrigerant that have an ozone depletion potential (ODP) greater than 0.2, and consist of all chlorofluorocarbons (CFCs). - ANSWER Class I Refrigerant Refrigerants that have an ozone depletion potential (ODP) of less than 0.2 and consist of all hydrochlorofluorocarbons (HCFCs). - ANSWER Class II Refrigerant Refrigerant appliances used in retail food and cold storage warehouse sectors. "Retail food" includes the refrigeration equipment found I. Supermarkets, convenience stores, restaurants, and other food services establishments. "Cold storage" includes the equipment used to store meat, produce, fairly products, and other perishable goods. All of this type of equipment contains large refrigerant charges, typically more than 75 pounds. - ANSWER Commercial Refrigeration A substance formed by a union of two or more elements in a definite proportion by weight. - ANSWER Compound to remove water from the system. - ANSWER Dehydrate The evacuation of a system down to a low vacuum, typically below 500microns, with the goal of removing non-condensable gases as well as evaporating and removing water from the system. - ANSWER Deep vacuum The temperature at which the non-azeotropic blend first begins to condense. - ANSWER Dew Point The process leading to and including and of the following - the discharging, depositing, dumping, or placing of any discarded appliance into land or water. - the disassembly of any appliance for discharging, depositing, dumping, or placing of it's discarded component parts into or on any land or water. - The disassembly of any appliance for reuse of its components parts. - ANSWER Disposal An electronic vacuum gauge that displays the vacuum level directly in microns and is the only accurate field method to determine the evacuation level of a deep vacuum. - ANSWER Electronic Vacuum Gauge or Micron Gauge The process of extracting any air, non-condensable gases, or water from the system and thereby reducing the pressure to some value below 0 psig. - ANSWER Evacuation The abbreviation for an Electronic Expansion Valve, a throttling device located upstream of the evaporator, that actively controls the pressure drop ( via electrical feedback from a temperature sensor) to maintain a prescribed superheat at the exit of the evaporator. - ANSWER EXV The separation of a liquid mixture into a separate parts by the preferential evaporation of the more volatile component. - ANSWER Fractionation A halogenated hydrocarbon containing one or more of the three halogens: fluorine, chlorine, and bromine. Hydrogen may or may not be present. - ANSWER Halocarbon An appliance that uses a refrigerant with a liquid phase saturation pressure between 170 psia and 355 psia at 104 F. This definition includes but is not limited to appliances using R-401 A, R-409 A, R-401B, R-22, R-411B, R-502, R-402B, R-408A, R-410A, and R-402A - ANSWER High-pressure appliance A compound containing only the elements hydrogen and carbon. - ANSWER Hydrocarbon An affinity for water, so hygroscopic oils are oils that readily absorb moisture. - ANSWER Hygroscopic Complex customized appliances used in the chemical, pharmaceutical, petrochemical industries, and in manufacturing. The sector includes industrial ice machines and ice rinks. - ANSWER Industrial Process Refrigeration One of a group of substances having the same combination of elements but arranged spatially in different ways. - ANSWER Isomer A combination shut-off and service value typically used on the inlet and outlet of a compressor, and on the inlet and outlet of a packaged condensing units. - ANSWER King Value The rate at which an appliance is losing refrigerant, projected over the next 12-months. The leak rate is expressed in terms of the percentage of the appliance's full charge that would be lost in the next 12-months if the current rate of loss were to continue over that period. The rate is calculated using the following formula: refrigerant added over total charge x 365 days per year over D x 100 - ANSWER Leak Rate The piping used to connect the outdoor unit (referred to as the condensing unit) to the indoor unit (sometime referred to as fan coil unit). It consists of two lines; the smaller, high-pressure liquid refrigerant line (which brings condensed refrigerant to the evaporator) and the larger, insulated low- pressure line (which brings cooler evaporated refrigerant vapor back to the compressor). - ANSWER Line set Any device that is intended to establish a connection between hoses, appliances, or recovery/ recycling machines, and that is designed to close automatically or to be closed manually when disconnected to minimize the release of refrigerant from hoses, appliances, and recovery or recycling machines. - ANSWER Low-Loss Fitting An appliance that uses a refrigerant with a liquid phase saturation pressure below 45 psia at 104 F. This definition includes but not limited to appliances using R-11, R-123, and R-113. - ANSWER Low-pressure appliance