EPA 608 UNIVERSAL EXAM VERIFIED ACTUAL EXAM ALL 160 QUESTIONS AND CORRECT DETAILED ANSWERS

What are two factors that, if present, are most likely to A sufficient concentration of the refrigeration in the space and an ignition source lead to an explosion with hydrocarbon refrigerants? An appliance normally containing more than 50 pounds of R-22 refrigerant was found to have a 35% annual leak rate. After the repair, how many successful verification tests are required? Two. Performed before the appliance is recharged All appliances must be equipped with a service aperture or process stub which is used when adding or removing refrigerant from the appliance. What is typically used on small appliances? A straight piece of tubing that is entered using a piercing access valve. Process Tube What is the primary purpose of a purge unit on a low pressure chiller? Remove non-condensable from the system Which of the following are recommended safe work practices when recovering refrigerants? Wear safety eyewear and butyl-lined gloves when connecting/disconnecting hoses What is the state of the refrigerant leaving the receiver in a refrigeration system? High pressure liquid Which of the following repairs would always be considered "major" under EPA's regulations? Replacement of an evaporator coil On low-pressure chillers, moisture most frequently enters the refrigeration system through: Leaks from areas with gaskets or fittings How would you remove moisture from refrigerant in a system? Use a filter drier Where does refrigerant go after it leaves the purge unit of a low-pressure centrifugal system? The evaporator Which refrigerants can be mixed in an appliance? Refrigerants cannot be mixed What gas should be used to leak check a system designed for use with R-410A that has been opened for a major Pressurized nitrogen