LATEST UPDATED EPA EXAM Already Solved 100%

the state of the refrigerant entering the metering device is? - Answer A subcooled high pressure liquid. what type of refrigerant is used in VERY high-pressure appliances? - Answer R-503 what type of refrigerant is used in MEDIUM pressure appliances? - Answer R-500 what type of refrigerant is used in HIGH pressure appliances? - Answer R-410A and R-22 what device is located at the END of the liquid line? - Answer The expansion device. what type of refrigerants are the LEAST harmful to the ozone layer? - Answer HFC refrigerants. How much money does the EPA offer to individuals who report information about others who vent refrigerants into the atmosphere? - Answer $10,000. which class of refrigerants does R-22 fall into? - Answer The HCFC class. (hydrochloroflurocarbons) which gas should be used when checking for leaks in various systems? - Answer Nitrogen. which term describes the process of changing a refrigerant from a liquid to a gas using HEAT? - Answer Latent heat. refrigerants in the SUCTION line are in what phase and state? - Answer Cold vapor. how many miles above the Earth's surface does the ozone layer in the stratosphere extend? - Answer 31 miles. what year was the Montreal Protocol put in place? - Answer 1989. refrigerant recovery equipment should be checked for (blank) on a daily basis? - Answer Refrigerant leaks and oil levels. should recovery machines be used on equipment that contains hydrogen? - Answer NO. which purity test is used to determine the type of refrigerant? - Answer ARI 700. what type of unit only requires ONE service connection? - Answer self-contained recovery units. air will cause (blank) discharge pressures in a refrigeration system. - Answer Higher. a strong odor is around during the recovery process. what is most likely the cause of this? - Answer A compressor burnout. what is the best way (position) to transport refrigeration cylinders? - Answer Upright. you can only accurately read refrigerant pressure with a stable (blank)? - Answer Temperature. an explosion can occur if (blank) is vented in an enclosed environment? - Answer Hydrogen. can refrigerants be mixed in a recovery tank? - Answer NO. what is the state of refrigerant leaving the liquid receiver? - Answer High pressure liquid. what is the minimum microns a vacuum pump must pull when evacuating a system? - Answer 500 microns. what is usually contained in refrigerants made before 1950? - Answer SO2. (sulfur dioxide) what prevents transient slugs of liquid from getting into the compressor? - Answer Accumulator. what is the filter drier responsible for removing? - Answer Moisture and Particulates. can the compressor compress liquid? - Answer NO. what is the best leak-checking procedure for a pressure decay test? - Answer Nitrogen. when the annual leak rate exceeds (blank), all comfort cooling systems with more than 50lb of refrigerant must be repaired. - Answer 15% True or False. the receiver is not part of the low side of a system located in a refrigeration system? - Answer True. how often should leaks be checked in the recovery or recycling unit for commercial refrigeration equipment? - Answer 3 months. how can you check if there is excess air / non-condensables in the tank? - Answer Checking the pressure inside the recovery tank. Reference the pressure / temperature chart. what type of system can a vacuum pump be used on for recovery? - Answer System-dependent (passive) recovery. when using a system-dependent recovery system with an operating compressor, where should the refrigerant be recovered from? - Answer High side of the system. when using a system-dependent recovery system with a non-operating compressor, where should the refrigerant be recovered from? - Answer Both high and low side. how can you release trapped refrigerants in the oil during recovery? - Answer Heat and tap the compressor with a mallet. when should piercing type valves be used and what is a common problem of these valves? - Answer Fitting tend to leak over time and should not be left on appliances. when was it established that it was a violation to vent CFCs or HCFCs? - Answer July 1st, 1992. when was it required for recovery/recycling equipment to be certified and labeled by the EPA? - Answer November 15th, 1993.