EPA 608 Exam Questions and Answers with Verified Solutions Graded A 2024

Why are flammable HFO refrigerants classified as A2L and not A2? - They have low flammability, being less flammable than HC refrigerants. Which of the following statements is true? - Propane cylinders for grilling contains impurities that refrigerant-grade propane does not have. Over-evacuation of a system can ________ - never occur; you can never pull too much air or other impurities from a system A system containing a flammable refrigerant must have the process tubes or service connection marked with a color marking that extends a minimum of ________ in both directions - 1 inch Which additional safety precaution should be followed when using flammable refrigerants? - Always make certain the recovery tank and recovery unit are grounded before being used. Do not cut or weld any refrigerant line when refrigerant is in the unit. Which refrigerant can fractionate? - R-407C Before shipping any recovered refrigerant, you must ________ - properly label the refrigerant containe What gas is used as the baseline measurement for GWP? - Carbon dioxide What happens when EPA regulations change after a technician is certified? - The technician has a responsibility to keep up with changes in EPA regulations When shipping refrigerant cylinders, they should be stored ________ - upright Why is venting an "exempt refrigerant" legal? - Because the EPA has determined that the refrigerant does not pose a threat to the environment if released If the compressor crankcase is the coldest part of the system, refrigerant will migrate to the compressor because of the difference in ________ in the system. - pressure A compound pressure gauge measures pressure in ________ - psig and inches of mercury In addition to the saturation pressure-temperature behavior of refrigerants, when considering a substitute refrigerant also consider ________ - cooling capacity flammability and toxicity materials compatibility Ozone depletion in the stratosphere is what type of problem? - Global problem Which action is a violation of the prohibition on venting refrigerants? - Adding nitrogen to a fully charged appliance to leak check the appliance and then venting the mixture When a system is operating, refrigerant enters the expansion device as a _______ - subcooled or saturated liquid Recovery cylinders should never be overfilled because ________ - the internal pressure of the cylinders can rise in heated areas and cause an explosion or venting A flammable refrigerant can only burn or explode if the refrigerant concentration is ________. - both above the lower flammability limit and below the upper flammability limit Which of the following synthetic lubricants is used with ternary refrigerant blends containing HCFCs? - Alkylbenzene EPA regulations only allow recovered or recycled refrigerant to be ________. - charged into the same or another appliance owned by the same person The ________ program identifies alternative refrigerants for use - SNAP Which health effect increases from loss of the stratospheric ozone layer? - Cases of cataracts and skin cancer