EPA 608 Certification Exam- Qwik Study 2023 Questions with correct Answers

Ozone stratosphere above the earth consists of molecules containing... - Answer- 3 oxygen atoms (O3) The oxygen we breathe contains how many atoms in each molecule? - Answer- two atoms (O2) The ozone layer consists of ozone in the stratosphere at an altitude of between __________above the earth - Answer- 7 and 28 miles the ozone layer is formed by what? - Answer- Ultra violet light from the sun acting on oxygen molecules,absorbs and scatter UV light from the sun What does the Ozone layer do? - Answer- prevents harmful amounts of UV light from reaching Earth. What is another name for the ozone layer? - Answer- ozone shield Ozone in the lower atmosphere where we breathe is caused by what? - Answer- UV radiation from the sun acting on smog and air pollutants Ozone at ground level is what? - Answer- Harmful pollutant Ozone in the stratosphere is what? - Answer- Protective Shield The ability of a substance to destroy ozone in the stratosphere is referred to as the what? - Answer- Ozone depletion potential (ODP) Chlorine in refrigerants causes what? - Answer- stratospheric ozone depletion The rise in the amount of chlorine measured in the stratosphere matches what? - Answer- The rise in ozone-depleting emissions of CFC's and HCFC's over the same period According to the Roland-Molina Theory how many ozone molecules are destroyed by each chlorine atom? - Answer- 100,000 What happens when ozone depletion occurs? - Answer- More UV radiation penetrates to the earths surface. The rise in the amount of chlorine measured in the stratosphere over the same time matches what? - Answer- The amount of fluorine The chlorine in the stratosphere is believed to come primarily from what? - Answer- CFC's & HCFC's Stratospheric ozone protection is a - Answer- global problem What is the Montreal Protocol? - Answer- and international treaty that addresses limiting ozone depleting substances. Increased concentration in the stratosphere of chlorine and bromine pose what? - Answer- substantial risks of ozone depletion The Ozone layer - Answer- protects Earth from harmful ultraviolet rays What are some side effects of increased UV radiation? - Answer- Skin Cancer, cataracts, suppression of immune system, reduced crop yields, damage to marine life, increased degradation of polymers, climate change What is the SNAP Program? - Answer- The Significant New Alternatives Policy identifies refrigerants with lower overall risks to human health and the environment. Technicians who violate the Clean Air Act provisions can be - Answer- fined up to $44,539 per day per violation, lose their certification, and face federal charges Knowingly releasing refrigerants during the service, maintenance, repair or disposal of appliances is... - Answer- illegal Chlorofluorocarbons (CFCs) contain what elements? - Answer- chlorine, fluorine, carbon Which refrigerants have the highest ODP - Answer- CFC's What makes CFC's chemically stable? - Answer- They contain no hydrogen What makes CFC's damaging to the ozone? - Answer- They contain chlorine What do CFC's & HCFC's do in water? - Answer- They do not dissolve or breakdown What were some commonly used CFC's before being banned? - Answer- R-11 & R-12 Hydrochloroflurocarbons (HCFCs) contain what elements? - Answer- Hydrogen, chlorine, fluorine, carbon What makes HCFC's less damaging to the environment than CFC's? - Answer- They contain hydrogen which makes them less stable and decompose faster What are some common HCFC's?? - Answer- R-22, R-123, R-124 Hydrofluorocarbon (HFC) refrigerants contain which elements? - Answer- hydrogen, fluorine, carbon HFC refrigerants don't contain which element? - Answer- Chlorine Do HFC Refrigerants damage the ozone layer? - Answer- no Do HFC refrigerants have global warming potential? - Answer- Yes HFC refrigerants has thousands of times the global warming potential than what other kind of refrigerant? - Answer- (HC) Hydrocarbon refrigerants Can HFC's be vented? - Answer- No What are some HFC refrigerants? - Answer- R-134A, R404A, R407C, R410A How much ozone depleting potential does Hydrofluoroolefin (HFO) have? - Answer- zero ODP HFO refrigerants have ___ GWP - Answer- low Some HFO Refrigerants have an ASHRAE safety classification of? - Answer- A2L -Non toxic (A) and slightly flammable (2L) Are all HFO Refrigerants flammable? - Answer- No What makes HFO Refrigerants less flammable the HC Refrigerants? - Answer- they contain fluorine What is not compatible with any HFO Refrigerant? - Answer- Silicone HFO's are are homogenous with what kind of oil? - Answer- POE Oil HC refrigerants have ___ ODP - Answer- zero HC Refrigerants have ____GWP - Answer- Low What refrigerant has the lowest GWP? - Answer- HC-Hydrocarbon What ASHRAE classification do HC Refrigerants have? - Answer- A3 - Non toxic (A) Highly flammable (3) Hydrofluoroether (HFE) refrigerants contain what elements? - Answer- hydrogen, fluorine, carbon, and oxygen HFE refrigerants have ___ ODP - Answer- zero HFE's can have _____GWP than other refrigerants such as HFC's - Answer- lower Many HFEs still have GWPs far above _________ - Answer- 100 are HFE Refrigerants suitable as long term replacement refrigerants? - Answer- No When is a refrigerant considered exempt? - Answer- When the EPA determines that it does not pose a threat to the environment if released What type of refrigerants do not have to be recovered? - Answer- exempt Exempt refrigerants have a GWP equal to or lower than ___ - Answer- Carbon Dioxide (1 or less) Exempt refrigerants include - Answer- Carbon dioxide, hydrocarbon refrigerants, nitrogen and, water Is ammonia an exempt refrigerant? - Answer- Yes Why is ammonia an exempt refrigerant? - Answer- it is not used in a vapor compression application what types of refrigerants must you recover? - Answer- CFC, HCFC, HFC, HFO According to the EPA there are no ____________ - Answer- drop in refrigerant substitutes The production or import of what type of ___________ in the US to service existing systems is banned beginning in 2020 - Answer- R-22 When a refrigerant is phased out, supplies of that refrigerant can only come from what? - Answer- recovered and reclaimed refrigerant True or false : It is legal to convert a R407C system to R-22 - Answer- false A binary blend is: - Answer- a two part fixture a ternary blend - Answer- is a three part mixture Temperature glide refers to: - Answer- A range of condensing and evaporating temperatures for one pressure All non-azeotropic refrigerants have what nomenclature? - Answer- (R-4XX) non azeotropic refrigerants are charged as a liquid or vapor? - Answer- liquid Why are non-azeotropic refrigerants charged as liquid? - Answer- because they vaporize at uneven rates due to different vapor pressures (fractionation)