EPA 608 (CORE) Exam Questions and Answers [Solved Correctly

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EPA 608 (CORE) Exam Questions and Answers [Solved Correctly] When moisture exists in an operating system, what is most likely to occur? ✔✔Acid will form. What factor(s) affects the speed of evacuation? ✔✔1) The size of the equipment being evacuated. 2)The ambient temperature. 3) The amount of moisture in the system A system is considered dehydrated when? ✔✔The vacuum indicator shows you have reached & held the required finished vacuum. The over-evacuation of a system: ✔✔Does not occur. The size (capacity) of the vacuum pump & the size of the suction line used will determine what? ✔✔The length of dehydration time. A system is dehydrated to do what? ✔✔Remove water & water vapor. To obtain an accurate vacuum reading during system evacuation, the system vacuum gauge should be located: ✔✔As far from the vacuum pump as possible. To scrap a disposable cylinder, the internal cylinder pressure should be reduced to at least what? ✔✔0 psig Never use an open flame to heat a refrigerant tank because? ✔✔1) It can result in venting refrigerant to the atmosphere. 2)The tank may explode, causing serious injury to people nearby. 3) Refrigerant in the tank may decompose, forming a toxic material. When operating refrigerant recovery or recycling equipment, the following precautions should always be followed. ✔✔1) Wear safety glasses. 2) Wear protective gloves. 3) Follow all safety precautions for the equipment. The color code for approved refrigerant recovery cylinders is? ✔✔Yellow tops & gray bodies. Containers designed "refillable" by DOT are used for transporting recovered pressurized refrigerant to? ✔✔To meet safety requirements. Refrigerant vapors or mist should not be inhaled because? ✔✔They may cause heart irregularities &/or unconsciousness. Never overfill refrigerant storage cylinders because? ✔✔The internal pressure of the cylinders may rise in heated areas & cause an explosion. What is the best proof that CFC's are in the stratosphere? ✔✔The measurement of CFC's in air samples from the stratosphere. Which type of refrigerant is the most harmful to the stratospheric ozone? ✔✔Refrigerants containing Bromine. It is necessary to place a refrigerant label on what? ✔✔A refrigerant cylinder which is being returned for reclaiming. When transporting cylinders containing used refrigerant, the DOT requires that you what? ✔✔Attach DOT classification tags. Before you dispose of any system containing a refrigerant, you must? ✔✔Recover the refrigerant. In general, blended refrigerants should be charged? ✔✔As a liquid. Refrigerant entering the compressor of a refrigeration system is a? ✔✔Superheated vapor. __________ refers to the process of cleaning refrigerants by oil separation & single or multiple passes through filter-driers, which reduce moisture & acidity? ✔✔Recycling When a system will not hold a vacuum after it has been evacuated, then? ✔✔The system may be leaking. Which gas(es) would cause the LEAST damage to the environment during a leak check? ✔✔Dry Nitrogen All recovery equipment currently being made is required to have what? ✔✔An EPA approved certification label.

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