EPA Core Practice Exam Verified Solutions

EPA Core Practice Exam Verified Solutions 1. What layer of the atmosphere protects us from excessive ultraviolet radiation? - ️ Ozone. 2. Which molecule found in CFCs and HCFCs depletes ozone? - ️ Chlorine. 3. What adverse effects have been attributed to the depletion of stratospheric ozone? - ️ Crop loss, eye disease, and skin cancer. 4. How many chlorine atoms are needed to destroy 1,000,000 ozone molecules? - ️ 10. 5. What is true about chlorine in CFCs? - ️ It will not dissolve in water. 6. What elements do HCFCs contain? - ️ Hydrogen, Chlorine, Fluorine, and Carbon. 7. Which refrigerant has the highest Ozone Depletion Potential (ODP)? - ️ CFCs. ### Certification and Regulatory Compliance 8. Since when have technicians been required to be certified to service, maintain, or dispose of appliances containing regulated refrigerants? - ️ November 14, 1994. 9. Since when has it been a violation of EPA Section 608 regulations to vent CFCs or HCFCs? - ️ July 1, 1992. 10. When did it become a violation of EPA Section 608 regulations to vent HFCs? - ️ November 15, 1995. 11. What is the proper disposal method for disposable cylinders? - ️ Recover any remaining refrigerant, render the cylinder useless, then recycle the metal. ### International Agreements and Refrigerant Processing 12. Which international treaty regulated the production and use of CFCs, HCFCs, halons, methyl chloroform, and carbon tetrachloride? - ️ Montreal Protocol. 13. What does recycling refrigerant involve? - ️ Separating the oil from the refrigerant and removing moisture by passing it through one or more filter driers. 14. What does reclaiming refrigerant refer to? - ️ Processing refrigerant to a level equal to new (virgin) product specifications as determined by chemical analysis. 15. What is true about HFCs concerning ozone? - ️ They will not damage stratospheric ozone. ### Indicators of Ozone Depletion 16. What does the presence of chlorine monoxide in the stratosphere indicate? - ️ The ozone layer is being depleted. 17. Are chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs) ODP substances? - ️ Yes, they are ODP substances. ### Recovery Systems and Refrigeration Components 18. What are the two types of recovery systems? - ️ System dependent and self-contained. 19. What should never be done when a system is in full vacuum? - ️ Never energize the compressor. 20. What happens in the evaporator? - ️ It changes a low-pressure liquid to a low-pressure vapor. 21. What happens in the condenser? - ️ It changes a high-pressure vapor to a high-pressure liquid. 22. What does the metering device do? - ️ It changes a high-pressure liquid to a low-pressure liquid. 23. What function does the compressor serve? - ️ It changes a low-pressure vapor to a high-pressure vapor. 24. What does an ozone molecule consist of?