epa 608 universal questions and answers graded A

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epa 608 universal questions and answers graded A Refrigeration technicians who violate the Clean Air Act can: - Lose their EPA certification, be fined, be required to appear in Federal court. Afte... r 1995, any supplies of CFC refrigerants to service existing units in the USA can only come from: - recovery and recycling. Refrigerant that is recovered can be returned to: - the same system or other systems owned by the same person without restriction. Refrigerant can not be called "reclaimed" unless it: - . has been chemically analyzed and the refrigerant meets the ARI-700 standard. The EPA can require a technician to demonstrate their ability to perform proper procedures for recovering and/or recycling refrigerant. Failure to demonstrate competency can result in: - revocation of the technicians certification. What characteristic(s) of CFCs make them more likely to reach the stratosphere than most other compounds containing chlorine? - Refrigerants that contain chlorine but not hydrogen are so stable that they do not break down in the lower atmosphere after being released. The chlorine or bromine reacts with the ozone, causing it to change back to oxygen, thus destroying the ozone layer. A system is considered dehydrated when: - the vacuum indicator shows you have reached and held the required finished vacuum. Disposable refrigerant containers are used for ______ virgin refrigerant Which refrigerant is an HCFC? - R-123, R-124, R-22 What statement is true about an azeotropic refrigerant mixture? - It is a mixture that acts like a single-component refrigerant over its entire range. Chlorofluorocarbos (CFCs) and hydrochlorofluorocarbons (HCFCs) have which of the following in common? - It is a mixture that acts like a single-component refrigerant over its entire range. To scrap a disposable cylinder, the internal cylinder pressure should be reduced to at least: - 0 psig. Manifold gauge sets are often color coded, when this is done, the high pressure gauge is color coded: - Red. In general, blended refrigerants should be charged: - as a liquid. Blended refrigerants leak from a system: - in uneven amounts due to different vapor pressures. Which of the following gases help form the earth's protective shield? - Stratospheric Ozone In a refrigerant system, the device that changes a low pressure vapor to a high pressure vapor is the: - compressor. Data shows that chlorine in the stratosphere comes mainly from CFCs rather than from natural sources such as volcanoes because: - The rise in the amount of chlorine in the stratosphere matches the rise in the amount of fluorine, which has different natural sources than chlorine; The rise in the amount of chlorine in the stratosphere matches the rise in CFC emissions; Air samples taken from the stratosphere over erupting volcanoes show that volcanoes contribute a small quantity of chlorine to the stratosphere when compared to CFCs; Which atom of the CFC molecule causes ozone depletion? - chlorine The ozone layer protects the earth from: - ultraviolet radiation from the sun. When using with any solvent, cleaner, chemical or refrigerant, you should review: - material safety data sheets. An award of up to what amount may be paid to a person supplying information that leads to a penalty against a technician who is intentionally venting? - 10,000 The Montreal Protocol is: - a treaty among nations that controls production of CFCs and HCFCs. Which refrigerant is an HCFC? - R-123, R-22, R-124 What is one of the most serious results of damage to the ozone layer? - increases in human skin cancer Of the refrigerants listed below, which has the lowest ozone depletion potential (ODP)? - R-22 To determine the maximum allowable pressure to use when checking a system, check: - the design pressure on the equipment nameplate Ozone depletion potential, or "ODP," is: - A measure of the ability of CFCs and HCFCs to destroy ozone. An example of an HFC refrigerant is: - R-134a Whenever dry nitrogen from a portable cylinder is connected to a system, what item is of most importance in consideration of safety? - There is relief in the downstream line from the pressure regulator. During servicing of a refrigeration system containing R-12, the refrigerant must be: - recovered. Which safety precaution(s) should always be followed: - Never apply an open flame to a refrigerant cylinder; never cut or weld any refrigerant line when refrigerant is in the line; never use oxygen to purge lines or to pressurize a system. In a vapor compression refrigeration system, cooling occurs when: - refrigerant liquid turns to a vapor. The evacuation of a system is a method of: - dehydration. Each chlorine atom in the stratosphere can destroy____ozone molecules. - 100,000 An example of a HFC refrigerant is: - R-410A Which gas(es) would cause the LEAST damage to t [Show More]

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