EPA 609
Universal Technical Institute
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Mastery Test EPA 609 Practice 2024/2025
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R-134a is a chlorine-free refrigerant Answer: True 
 
Ozone layer absorbs and scatters ________ from the sun Answer: ultraviolet light 
 
For determining the Ozone Depletion Potential ________ having been assigned a factor of 1 Answer: CFC-11 
 
A refillable refrigerant cylinder must not be filled above ______ of its full capacity. Answer: 80% 
 
Ozone at ground level and at Stratosphere is a harmful pollutant Answer: False 
 
Each chlorine ion can able to...
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