EPA 608 Type II Sample Test Questions With Verified Answers

Before charging a new system with refrigerant, what should be done? - Answer Pressurize with nitrogen (classified as an inert gas) and leak Which refrigerant can be used for leak detection as a trace gas and pressurized with nitrogen? - Answer R-22 What tools can you use to find general area of leaks and pinpoint leaks? a. Soap bubbles. b. Look for oil residue c. Electronic or ultrasonic leak detector will provide the general area of the leak d. Refrigerant dye - Answer c. Electronic or ultrasonic leak detector will provide the general area of the leak Traces of oil around a sight glass inlet fitting of a refrigeration system might be the indication of: a. A leak b. Excessive oil in the system c. An overcharge d. A restriction at the TXV - Answer a. A leak Describe ways you can visually look for leaks. a. Using soap bubbles b. Looking for traces of oil c. Excessive superheat, caused by low refrigerant charge d. All the above - Answer d. All the above Type II classification, as identified by EPA, applies to what equipment? a. Small appliances with five (5) pounds of refrigerant or less b. Refrigerators, freezers, and vending machine appliances c. Low pressure appliances d. Split air conditioning equipment with five (5) pounds of refrigerant or more - Answer d. Split air conditioning equipment with five (5) pounds of refrigerant or more What are the leak repair requirements for comfort cooling appliances and commercial Appliances containing 50 lbs. or more of refrigerant? a. Must be repaired if leak rate exceeds 15% in comfort cooling appliances. b. Must be repaired if leak rate exceeds 35% in all commercial and industrial process refrigeration c. a and b d. None of the above - Answer c. a and b What type of refrigerant was the most common before outlawing CFCs and HCFCs? a. R-12 b. R-22 c. R-500 d. R-134A - Answer b. R-22 The required level of evacuation for recovery equipment manufactured after November 15, 1993, on a system containing less than 200 pounds of R-12 refrigerant is: a. 0 inches Hg b. 4 inches Hg c. 10 inches Hg d. 15 inches Hg - Answer c. 10 inches Hg What is the purpose of the filter drier and when should it be changed? a. To filter the oil. Change every year. b. To remove moisture from the refrigerant, replace on a routine basis or anytime a system is opened c. Cleans the air. Replace monthly d. Dryer's air filters. Replace yearly - Answer b. To remove moisture from the refrigerant, replace on a routine basis or anytime a system is opened Industrial process and commercial refrigeration equipment with over 50 pounds of refrigerant with an annual leak rate of ___ % requires repair under EPA regulations. a. 0 b. 15 c. 35 d. 50 - Answer c. 35 How can you tell through a sight glass if there is excess moisture in the system? a. You can see moisture bubbles b. Look for color changes of the refrigerant c. You can see gas bubbles d. Site glass is clear - Answer b. Look for color changes of the refrigerant Comfort cooling chillers and all other equipment with over 50 pounds of refrigerant with an annual leak rate of ___ % requires repair under EPA regulations: a. 0 b. 15 c. 35 d. 50 - Answer b. 15 Using large vacuum pumps can lead to freezing of water in the system what are ways the technician can help prevent the freezing? a. Increase pressure by introducing nitrogen to counteract freezing b. Begin charging with vapor until pressure is above freezing c. a and b d. None of the above - Answer c. a and b The majority of the liquid to be recovered from a system will be found in the: a. Condenser b. Receiver (when applied) c. Low side of the system d. Evaporator - Answer b. Receiver (when applied) Foaming at start-up may be found in what component? What does this mean? a. Refrigerant in an accumulator foams on a low pressure. b. Refrigerant in the compressor oil will cause oil foaming. Prevent refrigerant migration with a crankcase heater c. Refrigerant in the receiver foams with high pressure d. Refrigerant in the condenser will foam on hot days - Answer b. Refrigerant in the compressor oil will cause oil foaming. Prevent refrigerant migration with a crankcase heater What are preferred ways to measure a deep vacuum? a. Use an analog vacuum gauge b. Measure to 500 Microns is preferred or inches of Mercury (inches Hg). c. Use a compound vacuum gauge on your manifold. d. Measurement is not necessary - Answer Measure to 500 Microns is preferred or inches of Mercury (inches Hg).