EPA 608 (CORE) Exam 2023 with complete solutions

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When moisture exists in an operating system, what is most likely to occur? - Answer- Acid will form. What factor(s) affects the speed of evacuation? - Answer- 1) The size of the equipment being eva... cuated. 2)The ambient temperature. 3) The amount of moisture in the system A system is considered dehydrated when? - Answer- The vacuum indicator shows you have reached & held the required finished vacuum. The over-evacuation of a system: - Answer- Does not occur. The size (capacity) of the vacuum pump & the size of the suction line used will determine what? - Answer- The length of dehydration time. A system is dehydrated to do what? - Answer- Remove water & water vapor. To obtain an accurate vacuum reading during system evacuation, the system vacuum gauge should be located: - Answer- As far from the vacuum pump as possible. To scrap a disposable cylinder, the internal cylinder pressure should be reduced to at least what? - Answer- 0 psig Never use an open flame to heat a refrigerant tank because? - Answer- 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. - Answer- 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? - Answer- Yellow tops & gray bodies. Containers designed "refillable" by DOT are used for transporting recovered pressurized refrigerant to? - Answer- To meet safety requirements. Refrigerant vapors or mist should not be inhaled because? - Answer- They may cause heart irregularities &/or unconsciousness. Never overfill refrigerant storage cylinders because? - Answer- 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? - Answer- The measurement of CFC's in air samples from the stratosphere. Which type of refrigerant is the most harmful to the stratospheric ozone? - Answer- Refrigerants containing Bromine. It is necessary to place a refrigerant label on what? - Answer- A refrigerant cylinder which is being returned for reclaiming. When transporting cylinders containing used refrigerant, the DOT requires that you what? - Answer- Attach DOT classification tags. [Show More]

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