EPA 608 Practice Test #1with Complete Solutions

What is a blend of two or more components who's equilibrium vapor phase & liquid phase compositions are the same at a given pressure? - ANSWER-Azeotrope This is a halogenated hydrocarbon containing one or more of the three halogens: fluorine, chlorine, and bromine - ANSWER-Halocarbon Chlorofluorocarbons (CFCs) consist of? - ANSWER-Chlorine, fluorine, carbon CFCs are chemically very stable because they contain no? - ANSWER-Hydrogen CFCs are damaging to what layer of the ozone layer? - ANSWER-Stratospheric Of the three common types of refrigerants this one has the highest ozone depletion potential (ODP) - ANSWER-CFCs These test methods are assumed by the EPA as the most effective methods for locating the general area of small leaks - ANSWER-Electronic and ultrasonic After recovery of a system, if the pressure rises above ambient pressure then what is most likely happening? - ANSWER-Trapped refrigerant is probably boiling off In cases where the refrigerant cannot be reclaimed due to contamination with other refrigerants, what must be done to the refrigerant? - ANSWER-Must be destroyed by incineration at an approved facility Where should the system vacuum gauge be connected? - ANSWER-As close as possible to the system being evacuated Import of CFCs will be banned after December 31, what year? - ANSWER-1995 A second category of refrigerant is currently available which is hydrochlorofluorocarbons (HCFCs). Although they contain chlorine, which is damaging to the ozone layer, they also contain this which makes them chemically less stable once they enter the atmosphere. - ANSWER-Hydrogen Under EPA's regulations, reclaimed refrigerant must meet what standards for purity before it can be resold? - ANSWER-ARI-700 What type of recovery devices are so named because they depend on components of the system; that is, they capture refrigerant with the assistance of components in the air conditioning or refrigeration equipment as they are emptying. - ANSWER-System dependent All devices used for refrigerant recovery must meet what standards? - ANSWER-EPA What is one HCFC? - ANSWER-R-22 Refrigerants that contain no chlorine at all are called? - ANSWER-HFCs CH2FCF3 refrigerant is a? - ANSWER-HFC Ozone in the stratosphere consist of molecules containing how many oxygen atoms? - ANSWER-3 What's in refrigerants causes ozone destruction? - ANSWER-Chlorine CFCs are able to reach the stratosphere because? - ANSWER-They are chemically very stable The lower case letter following the refrigerant number, as in 134a for example, is the? - ANSWER-Form of the isomer What refrigerants are toxic? - ANSWER-Group 2 What group of refrigerants are nonflammable mixtures of group 1 & 3 refrigerants, which are nonflammable as formulated but who's composition can become flammable do to fractionation under some leakage situations - ANSWER-Group 4 What group of refrigerants are flammable but not toxic? - ANSWER-Group 3 What group of refrigerants do not show flame propagation? - ANSWER-Group 1 R-134a refrigerant tanks are what color? - ANSWER-Light Blue Disposable cylinders are manufactured to specifications established by? - ANSWER-DOT Every refrigerant cylinder is equipped with what device that will automatically vent pressure from the cylinder before it reaches the rupture point? - ANSWER-Safety (pressure) relief valve Refillable cylinders are regulated in their design, fabrication & tested by who for use in the transportation of refrigerants? - ANSWER-DOT Capturing and ultimately eliminating the use of chlorofluorocarbons is being done in the United States to stop damage to what layer of the ozone? - ANSWER-Stratospheric