EPA 608 (CORE) Exam 2022/2023 with 100% correct answers

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.