EPA 608 Core Universal Exam Elaboration |100% Correct Answers|

EPA 608 Core Universal Exam Elaboration |100% Correct Answers| Refrigeration technicians who violate the Clean Air Act can: *Ans* D) all of the above. After 1995, any supplies of CFC refrigerant to service existing units in the USA can only come from: *Ans* A) recovery and recycling. Refrigerant that is recovered can be returned to: *Ans* A) the same system or other systems owned by the same person without restriction. Refrigerant can not be called "reclaimed" unless it: *Ans* B) has been chemically analyzed and the refrigerant meets the ARI-700 purity 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: *Ans* A) revocation of the technician's certification. What characteristic(s) of CFCs make them more likely to reach the stratosphere than most other compounds containing chlorine? *Ans* A) 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 ozone, causing it to change back to oxygen, thus destroying the ozone layer. A system is considered dehydrated when: *Ans* A) the vacuum indicator shows you have reached and held the required finished vacuum. Disposable refrigerant containers are used for _______ refrigerant. *Ans* C) virgin Which refrigerant is an HCFC? *Ans* A) R-124 What statement is true about an azeotropic refrigerant mixture? *Ans* D) It is a mixture that acts like a single-component refrigerant over its entire range. Chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs) have which of the following in common? *Ans* D) They must be recovered before opening or disposing of appliances. To scrap a disposable cylinder, the internal cylinder pressure should be reduced to at least: *Ans* A) 0 psig. Manifold gauge sets are often color coded, when this is done, the high pressure gauge is color coded: *Ans* A) red. In general, blended refrigerants should be charged: *Ans* C) as a liquid. Blended refrigerants leak from a system: *Ans* B) in uneven amounts d