EPA 608 Certification Exam Guide Questions with Correct Answers Graded A 2024-2025, Exams of Nursing

Download EPA 608 Certification Exam Guide Questions with Correct Answers Graded A 2024-2025 and more Exams Nursing in PDF only on Docsity! EPA 608 Certification Exam Guide Questions with Correct Answers Graded A 2024-2025 November 14, 1994 - What date was the sale of CFC's & HCFC's restricted to technicians certified in refrigerant recovery? Memorize it, ya'll. - 1987- Montreal Protocol July 1 1992- Violation to vent CFCs or HCFCs Nov 15 1993- Recovery/Recycling equipment must be certified and labeled by EPA AND Before this date recovery equipment needed to be capable of removing 80% of the refrigerant, w or wo compressor, or 4 in Hg After this date recovery equipment needs to be capable of removing 90%, or 80% without working compressor, or 4 in Hg AND Required level of evacuation for Low Pressure appliances before this date was 25 inches Hg, after this date 25 mm Hg Nov 14 1994- Certification needed to service, maintain, or dispose of appliances with refrigerants AND Sale of CFC and HCFC refrigerants restricted to certified techs Nov 15 1995- Violation to vent HFCs Dec 31 1995- CFCs no longer produced 15% - Comfort cooling appliances containing more than 50 lbs of refrigerant must be repaired when the annual leak rate exceeds _____% 35% - Commercial and Industrial process refrigeration containing ore than 50 lbs of refrigerant must be repaired when the annual leak rate exceeds _____% 0 0 4 10 4 10 4 15 0 0 - Required Recovery Levels for Type II appliances, before and after 11/15/93: HCFC22 less than 200 lbs = B4-0 After-0 HCFC22 more than 200 lbs= B4-4 After-10 NonHCFC22 less than 200 lbs= B4-4 After 10 NonHCFC22 more than 200 lbs= B4 4 After 15 Very high pressure appliances= B4-0 After-0 Recover all refrigerants. - Section 608 of the Federal Clean Air Act requires technicians to what? The earth's stratosphere. - The objective of the Clean Air Act is to protect what? HydroFlouroCarbon's - HFC's ChloroFluoroCarbon's - CFC's Ozone Depletion Potential - ODP The Montreal Protocol. - Which international treaty agreement was the basis for Section 608? 1.Crop losses 2.Increases in eye diseases 3.Skin Cancer 4.Reduced marine life 5.Deforestation 6.Increased ground level ozone - Depletion of the ozone in the stratosphere is known to cause what 6 things? These atoms attack Ozone Molecules causing the formation of Chlorine Monoxide (CLO), after colliding with another Ozone Molecule, causes 2 Oxygen (O2) molecules to be made & leaving an atom of chlorine to act as "Free Agent" starting the process over until 100,000 molecules of Ozone are destroyed by just one atom of chloride. - What happens when CFC or HCFC molecules get in the stratosphere & free atoms of Chlorine are set free? November 15, 1993 - What date was recovery equipment required to be certified by a lab, & achieve higher evacuation levels, & have low loss fittings? November 14, 1994 - On what date was technician certification required? December 31, 1995 - What date were CFC's phased out of production? Yes, but must meet the standard set forth in ARI 700 before it can be resold. - Can Reclaimed refrigerant be resold? Chlorine Monoxide (CLO) - What chemical has been found in the stratosphere indicating ozone depletion? 1.Household refrigerators 2.Household freezers 3.Room air conditioners 4.Water Coolers 5.Drinking fountains - What are 5 Type I appliances? 1.Walk-in coolers 2.Walk-in freezers 3.Reach-in refrigerators 4.Reach-in freezers 5.Residential & Commercial comfort cooling systems 6.Ice machines - What are 6 Type II appliances? Low pressure chiller. - What is an example of a Type III appliance? When calculating Superheat. - When is "Dew Point" used? When calculating Sub-cooling. - When is "Bubble Point" used? EPA requires a service aperature (process stub). - What does the EPA require on all Type I equipment that uses Class I or Class II refrigerants. Thermostatic Expansion Valve - TXV 1.Evaporator 2.Condenser 3.Compressor 4.Auxillary Heat Exchanger - The EPA considers a major repair to be the replacement of what 4 items? The charging valve on the evaporator. - When the refrigerant is put back into a Type III chiller, following recovery and system repair, where is it added? Hydrostatic (tube) test - What method is used to find suspected water tube leaks in chillers? 130-Degrees F - What temperature should be attained when removing oil from a low pressure system to ensure a lower level of refrigerants in the oil? 15 PSIG - The typical design burst pressure for a rupture disc is what? Tube Leakage - Excessive moisture collection in the purge unit can indicate what? 500 microns - Vacuum pumps need to be capable of pulling what level of vacuum? 35% - All refrigeration systems containing more than 50 lbs. of refrigerant must be repaired when the annual leak rate exceeds___? Controlled hot water or heater blankets. - The most efficient method of leak checking a charged low-pressure system is to use? At the shaft seal. - Systems with open drive compressors are prone to leak where? A refrigerant monitor that will sound and alarm and automatically start a ventilation system in equipment rooms before the refrigerant concentration reaches the TLV-TWA. - What does ASHRAE standard 15 require? Threshold Limit Value, Time Weighted Average - TLV-TWA Oxygen Deprivation Sensor - A-1 Group Refrigerants only require what? "Refrigerant Specific" Mechanical Room Sensor. - All "B" rated refrigerants require what? They are heat removal devices used to transfer process waste heat to the atmosphere. - What are Cooling Towers? 10 psig - What is the maximum test pressure to use for pressurizing Type III centrifugal systems with nitrogen? 36F - Enough vapor has entered the system and you may begin charging liquid refrigerant when the refrigerant saturation temperature increases to? Small appliances- 5lbs or less - Type 1 Residental Units/ Light Commercial - Type 2 Industrial - Type 3 All types - Universal Nov 14th, 1994 - Section 608 of the federal clean air act requires all persons who maintain, service, repair or dispose of appliances that contain regulated refrigerants, be certified in proper refrigerant handling techniques as of Low Loss Fitting - What is used to cause a minimal amount of refrigerant to be released? R-11, R-12, R-113, R-114,R-115 - CFC Refrigerants R-22, R-123, R-124, R-1426 - HCFC Refrigerants R-125, R-134A, R-23, R-32, R-125, R-143a, R-152A - HFC Refrigerants Blue Hose - The compound gauge of the manifold that measures low pressure (psig) and vacuum (inches Hg.) is what color? Red Hose - The high pressure gauge of the manifold that measures the high side (discharge) pressure is what color? Yellow Hose - The center port of the manifold that can be connected to a recovery device, evacuation vacuum pump or charging device is what color? De- Minimus - The Latin word for the least amount of Refrigerant you can release into the atmosphere? 2020 - HFC's will be Phased out by? December 31st, 1995 - CFC's were phased out of production by? Global Warming Potential - GWP Air Conditioning/ Refrigeration Institute (Govern standards covering subjects of air conditioning, refrigeration, and heating industry) - ARI November 15th, 1993 - After what date must refrigerants be certified and labeled by EPA Approved Equipment Testing Organizations to meet EPA Standards? Using the assistance of components in the appliance for recovery. - What does System Dependent (passive) recovery equipment mean? Using equipment's own compressor for recovery. - What does Self Contained (active) recovery equipment mean? O2 - The Standard oxygen we breathe is? O3 - The ozone molecule is? 0-7 miles - Trophosphere is? 10 psig when evacuating the refrigerant from a low pressure chiller (rupture disc at 15psig) - A recovery unit's high pressure cut-out is set for (Psig for Type III): 100 pounds of vapor - 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 - When removing oil from a low-pressure system, a temperature of what must be attained? Liquid removal, followed by vapor. - Refrigerant recovery from a system using R-11 or R-123 starts with recovery of (Type III): freezing of the water. - Water must be circulated through the tubes when evacuating refrigerant in order to prevent ________ municipal water supply. - Most low-pressure recovery machines utilize a water-cooled condenser that is connected to the ________ 16.9" hg. vacuum or 36 degrees F. - 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 - 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. - What is one refrigerant used in low pressure refrigerated appliances? Ammonia. - Nitrogen reacts with hydrogen to form what? Liquid line - The ______ connects the condenser to the expansion device: Nov 15, 1993 - 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. - Which type of leak detector works by drawing the vapor into the system and heating it? Ultraviolet radiation - _____ 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. - If the vacuum pump used is too large, water removal from the system will become easier or more difficult? 609 - 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. - 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. - 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 - If the label identifying the refrigerant is missing, then which method is used to identify the type of refrigerant? Temperature - References to the pressure/temperature chart for determining the type of refrigerant are only valid if the _____ is known: HFC - 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 - All refrigerant recovery equipment should be checked for _____ on a daily basis: 10 - Typical AC compressors are limited to about _______ tons of cooling capacity both pressure and temperature - 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 - Moisture indicating sight glass is located downstream of the which of the following: Filter Drier Expansion Valve Compressor Condenser 500 microns - When evacuating a system, it is required that the vacuum pump pull a minimum of _____ microns. High-Pressure Liquid - 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 - The liquid receiver is NOT part of the low side of the system. T or F False - Hermetic compressor can be operated when the system is under a deep vacuum. T or F Both High Superheat and Oil Traces - Which of the following are the indications that a high pressure system has a leak: High Superheat Oil Traces Both of the above 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) - 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 - To Convert From PSIA To PSIG _____ 14.7 to the PSIA reading. Subtract Add 1/1,000 - Micron is _____ of a millimeter of mercury vacuum The displacement of oxygen in a room by the denser refrigerant. - 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. - Azeotrope The temperature at which the non-azeotropic blend first begins to evaporate (boil). - 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. - 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. - Appliance Refrigerant that have an ozone depletion potential (ODP) greater than 0.2, and consist of all chlorofluorocarbons (CFCs). - Class I Refrigerant Refrigerants that have an ozone depletion potential (ODP) of less than 0.2 and consist of all hydrochlorofluorocarbons (HCFCs). - 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. - Commercial Refrigeration A substance formed by a union of two or more elements in a definite proportion by weight. - Compound to remove water from the system. - 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. - Deep vacuum The temperature at which the non-azeotropic blend first begins to condense. - 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. - 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. - 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. - 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. - EXV The separation of a liquid mixture into a separate parts by the preferential evaporation of the more volatile component. - Fractionation A halogenated hydrocarbon containing one or more of the three halogens: fluorine, chlorine, and bromine. Hydrogen may or may not be present. - 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 - High-pressure appliance A compound containing only the elements hydrogen and carbon. - Hydrocarbon An affinity for water, so hygroscopic oils are oils that readily absorb moisture. - Hygroscopic Complex customized appliances used in the chemical, pharmaceutical, petrochemical industries, and in manufacturing. The sector includes industrial ice machines and ice rinks. - Industrial Process Refrigeration One of a group of substances having the same combination of elements but arranged spatially in different ways. - 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. - 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 - 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). - 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. - 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. - Low-pressure appliance An appliance that uses a refrigerant with a liquid phase saturation pressure between 45 psia and 170 psia at 104 F. This definition includes but not limited to appliances using R-114, R-124, R-12, R-401C, R-406A, and R-500. - Medium-pressure appliance One thousandth (1/1,000) of a millimeter of mercury vacuum. - Micron A blend of two or more components that do not a have fixed proportion to one another and that no matter how well blended, they still retain a separate existence ( oil and water, for example). - Mixture Any of the following products that are fully manufactured, charged, and hermetically sealed in a factory with five pounds or less of refrigerant: refrigerators and freezers designed for home use, room air conditioners (including window air conditioners and packaged terminal air conditioners), packaged terminal heat pumps, dehumidifiers, under-the-counter ice makers, vending machines, and drinking water coolers. - Small Appliance Any chemical or product substitute, whether existing or new, used by any person as a replacement for a class I or II compound in a given end-use. - Substitute Recovery that requires the assistance of components contained in an appliance to remove the refrigerant from the appliance - System-Dependent Recovery Any person who performs maintenance, service, or repair that could reasonably be expected to release refrigerant into the atmosphere, including but not limited to installers, contractor employees, in-house service personnel, and, in some cases, owners. Technician also means any person disposing of appliances except for small appliances. - Technician The difference between the Dew Point and the Bubble Point. - Temperature Glide An evacuation method where the system is evacuated (pulled-down ) initially to a vacuum of at least 500 to 2,000 microns. Then, a small amount of dry nitrogen is introduced into the system to raise the pressure to above ambient pressure (typically to about 15 psig). The purpose of the nitrogen is to absorb moisture from the system. The nitrogen is then purged (vented). Recovery of the nitrogen is not required. This process is repeated two additional times with the final evacuation down to at least 500 microns. - Triple evacuation The abbreviation for a Thermal Expansion Valve, which is a throttling device located upstream of the evaporator that actively controls the pressure drop (via the effect of the pressure developed in a sensing bulb acting on a metering valve) to maintain a prescribed superheat at the exit of the evaporator. - TXV The device used to pump the air, moisture, and other non-condensables out of a system and, hence, evacuate the system, The extraction of the air and non-condensables lowers the pressure inside of the system (below atmospheric pressure), which causes any trapped liquid water to evaporate and be exhausted by the vacuum pump. Single- stage and two-stage vacuum pumps are commonly used in the HVAC/R industry. A two-stage vacuum pump is necessary to pull the deep vacuums (below 500 microns), which are necessary for the proper evacuation and removal of water in systems. Both the single-stage and two-stage vacuum pumps are rated by their volumetric capacity, typically expressed in cubic feet per minute (cfm). Three to six cfm pumps are typically used in residential applications. - Vacuum pump An appliance that uses a refrigerant with a critical temperature below 104°F or with a liquid phase saturation pressure above 355 psia at 104°F. This definition includes but is not limited to appliances using R-13 or R-503. Very high-pressure refrigerants include R-13, R-23, and R-503. - Very high-pressure appliance