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Answers
How does the global warming potential of R-410A compare to that of carbon dioxide? - correct answer ✅It is thousands of times greater How do the global warming potentials of isobutane (R-600a), propane (R-290), and R-4414 compare to the GWPs of HFC-134a, R- 404A, and R-410A? - correct answer ✅they are significantly lower What are the characteristics of hydrofluoroolefins (HFOS)? - correct answer ✅Non-ozone depleting, and have a low global warming potentials Why are HFO refrigerants less flammable than hydrocarbon refrigerants? - correct answer ✅They contain fluorine Which of the following refrigerants is an HFO? - correct answer ✅R-1234yf
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Which element in a CFC or HCFC molecule causes ozone depletion?
correct answer ✅Chlorine Which type of refrigerant is the most harmful to stratospheric ozone? - correct answer ✅CFC Which refrigerant depletes the ozone layer? - correct answer ✅R- What evidence demonstrates that chlorine in the stratosphere is primarily from man-made chemicals rather than from natural sources such as volcanoes? - correct answer ✅all the listed reasons
- The rise in the amount of chlorine measured in the stratosphere matches the rise in the amount of Aucrine, which has different natural sources than chlorine, over the same period.
- The rise in the amount of chlorine measured in the stratosphere matches the rise in ODS emissions over the same period
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correct answer ✅they must be recovered before opening or disposing of appliances What is the Montreal Protocol? - correct answer ✅An international treaty that addresses ozone- depleting substances and their alternatives Under EPA's regulatons, what standard must rechined refrgerantmeet before it can be resold? - correct answer ✅AHRI 700 How do refrigerant blends leak from a system? - correct answer ✅At uneven rates due to different vapor pressures What is unique about an azeotropic refrigerant mixture? - correct answer ✅It is a mixture that acts like a single-component refrigerant over its entire range. In what state does the refrigerant leave the condenser? - correct answer ✅high pressure liquid
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Which word applies to the process that returns refrigerant to new product specifications and that requires chemical analysis? - correct answer ✅to reclaim You have to leak check a unit which has lost a complete charge. Which gas(es) would cause the LEAST damage to the environment?
correct answer ✅dry nitrogen What effect will low ambient temperatures have on recovery? - correct answer ✅Increase the recovery time Which of the following factors affect the speed of system dehydration? - correct answer ✅The ambient temperature and amount of moisture in the system In the event of a large release of CFC, HCFC, or HFC refrigerant in a contained area which of the following is true? - correct answer ✅Self-contained breathing apparatus (SCBA) or leaving the area is required.
