{"id":"epa-608-free","timeLimitSec":300,"questions":[{"id":"epf-01","section":"core","q":"Which of these refrigerants is a CFC?","options":["R-12","R-22","R-134a","R-410A"],"answer":0,"explain":"R-12 is a chlorofluorocarbon (CFC) with a high ozone depletion potential. R-22 is an HCFC, while R-134a and R-410A are HFCs without chlorine."},{"id":"epf-02","section":"t1","q":"A technician repairs household refrigerators and window air conditioners. Which certification does the work need at minimum?","options":["Type II","Type III","No certification at all","Type I"],"answer":3,"explain":"Small appliances (factory-sealed, 5 pounds of refrigerant or less) need Type I certification. Type II covers high-pressure systems and Type III low-pressure systems."},{"id":"epf-03","section":"t2","q":"Under the EPA evacuation table, what level is required for a medium-pressure appliance under 200 pounds when the recovery machine was made before November 15, 1993?","options":["10 inches of Hg vacuum","0 inches of Hg vacuum","4 inches of Hg vacuum","15 inches of Hg vacuum"],"answer":2,"explain":"40 CFR 82.156 Table 1 requires 4 inches of Hg vacuum with older recovery equipment for this appliance. With equipment made on or after November 15, 1993 the level is 10 inches."},{"id":"epf-04","section":"t3","q":"How does the evaporator of an R-123 centrifugal chiller usually operate?","options":["Below atmospheric pressure","Above the rupture disc setting","Above 170 psig","At exactly 0 psig"],"answer":0,"explain":"Low-pressure refrigerants such as R-123 boil at about 82°F at sea level, so the evaporator runs in a vacuum. That is why leaks let air and moisture in instead of letting refrigerant out."},{"id":"epf-05","section":"core","q":"How long is a Section 608 technician certification valid?","options":["2 years","It does not expire","5 years","10 years"],"answer":1,"explain":"EPA states that Section 608 technician certifications do not expire. Keep a copy at your place of business."}]}