EPA 608 Type III Sample Test Questions & Answers

Where do leaks commonly occur in low pressure systems? a. Evaporator b. Condenser c. Purge unit d. Gaskets or fittings - ANSWER d. Gaskets or fittings Where do leaks commonly occur in open-drive type compressor systems? a. Evaporator b. Condenser c. Shaft seal d. Cooling tower - ANSWER c. Shaft seal Does refrigerant go out of the system in low pressure systems or does air and moisture go in? a. Refrigerant escapes through low pressure leaks. b. Air and moisture enter the refrigeration system because it operates in a vacuum c. Refrigerant leaks out through shaft seals and gaskets. - ANSWER b. Air and moisture enter the refrigeration system because it operates in a vacuum When should a low pressure system be leak checked according to ASHRAE guideline 3-1996? a. There are specific recommendations. b. During pressure checks c. When the system rises from 1 mm Hg to a level above 2.5 mm Hg during vacuum testing d. Leak check every year - ANSWER c. When the system rises from 1 mm Hg to a level above 2.5 mm Hg during vacuum testing What does a purge unit do and what is a high efficiency purge unit? a. Removes the refrigerant from the system. High efficiency purge system will expel large quantities of refrigerant b. Removes the refrigerant from the system. High efficiency purge system will expel very little refrigerant c. Removes the oil from the system. High efficiency purge system will expel very little refrigerant d. Removes the air from the system. High efficiency purge system will expel very little refrigerant - ANSWER d. Removes the air from the system. High efficiency purge system will expel very little refrigerant How does a centrifugal compressor purge unit work? a. Takes its suction from the top of the evaporator, removes the air from the system, and returns the refrigerant to the evaporator b. Takes its suction from the top of the chiller barrel, removes the air from the system, and returns the refrigerant to the evaporator c. Takes its suction from the top of the compressor suction, removes the air from the system, and returns the refrigerant to the evaporator d. Takes its suction from the top of the condenser, removes the air from the system, and returns the refrigerant to the evaporator - ANSWER d. Takes its suction from the top of the condenser, removes the air from the system, and returns the refrigerant to the evaporator What are visible ways to check for leaks in a low pressure system? a. Excessive running of a purge system. b. Continuous excessive moisture in the purge unit could indicate a leak in the condenser or the chiller barrel. c. High head pressure d. All the above - ANSWER d. All the above What needs to be done to leak check a low pressure system? a. Increase the pressure in the system by the use of nitrogen b. Increase the pressure in the system by the use of oxygen c. Increase the pressure in the system by the use of controlled hot water or heater blankets d. Increase the pressure in the system by the use of boiler hot water - ANSWER c. Increase the pressure in the system by the use of controlled hot water or heater blankets What are ways you can increase the pressure in the system? a. controlled