EPA 608 EXAM PRACTICE QUESTIONS
1-100/ANSWERED QUESTIONS
1. _______ makes HFO refrigerants less flammable than HC refrigerants. - ANSWER-
Flourine
2. ________ returns refrigerant to new product specifications and requires chemical
analysis to verify the purity to AHRI-700 standards. - ANSWER-reclaiming
3. __________ is an approved refrigerant for new household refrigerators, freezers, and
combination refrigeration/freezers. - ANSWER-R-600a
4. ____________ indicates low charge in a high-pressure system with a capillary tube. -
ANSWER-excessive superheat
5. ____________ is the only EPA SNAP approved "drop in" replacement for
R-22. - ANSWER-There are no direct drop-in refrigerant substitutes
6. ____________ will speed up recovery. - ANSWER-cooling the recovery tank
7. A comfort-cooling appliance containing 60 pounds of refrigerant has a significant
leak (leaking beyond the applicable leak rate threshold). You have _______ days to
repair the leak and perform a successful initial leak verification test. - ANSWER-30
8. A hermetic compressor will overheat if operated in a vacuum because _________. -
ANSWER-the compressor motor uses the flow of refrigerant through the compressor
for cooling
, 9. A hydrostatic tube test kit is used to _______. - ANSWER-find if there is a leak in the
tube
10. A passive system-dependent recovery process _________. - ANSWER-uses a non-
pressurized container
11. A process stub is a ________. - ANSWER-straight piece of tubing that is entered
using a piercing access valve
12. A purge unit is connected to the ______. - ANSWER-top of the condenser
13. A small appliance is defined as a system that is __________. - ANSWER-
manufactured, fully charged, and hermetically sealed in a factory with a charge of 5
pounds or less
14. A system is considered dehydrated when _________. - ANSWER-a micron gauge
shows you have reached and held a vacuum of 500 microns or less with the vacuum
pump isolated from the system
15. A system with a large liquid receiver needs a major system repair to replace a faulty
TXV. When servicing the unit ________. - ANSWER-the refrigerant should be
recovered to or isolated in the receiver
16. A very large refrigerant leak can cause suffocation because refrigerants _________. -
ANSWER-are heavier than air and displace oxygen
17. According to the EPA, when all the R-123 liquid has been removed from an average
350-ton R-123 chiller and the system vapor pressure is 0 psig, the system contains
_______. - ANSWER-100 pounds of refrigerant in the system
1-100/ANSWERED QUESTIONS
1. _______ makes HFO refrigerants less flammable than HC refrigerants. - ANSWER-
Flourine
2. ________ returns refrigerant to new product specifications and requires chemical
analysis to verify the purity to AHRI-700 standards. - ANSWER-reclaiming
3. __________ is an approved refrigerant for new household refrigerators, freezers, and
combination refrigeration/freezers. - ANSWER-R-600a
4. ____________ indicates low charge in a high-pressure system with a capillary tube. -
ANSWER-excessive superheat
5. ____________ is the only EPA SNAP approved "drop in" replacement for
R-22. - ANSWER-There are no direct drop-in refrigerant substitutes
6. ____________ will speed up recovery. - ANSWER-cooling the recovery tank
7. A comfort-cooling appliance containing 60 pounds of refrigerant has a significant
leak (leaking beyond the applicable leak rate threshold). You have _______ days to
repair the leak and perform a successful initial leak verification test. - ANSWER-30
8. A hermetic compressor will overheat if operated in a vacuum because _________. -
ANSWER-the compressor motor uses the flow of refrigerant through the compressor
for cooling
, 9. A hydrostatic tube test kit is used to _______. - ANSWER-find if there is a leak in the
tube
10. A passive system-dependent recovery process _________. - ANSWER-uses a non-
pressurized container
11. A process stub is a ________. - ANSWER-straight piece of tubing that is entered
using a piercing access valve
12. A purge unit is connected to the ______. - ANSWER-top of the condenser
13. A small appliance is defined as a system that is __________. - ANSWER-
manufactured, fully charged, and hermetically sealed in a factory with a charge of 5
pounds or less
14. A system is considered dehydrated when _________. - ANSWER-a micron gauge
shows you have reached and held a vacuum of 500 microns or less with the vacuum
pump isolated from the system
15. A system with a large liquid receiver needs a major system repair to replace a faulty
TXV. When servicing the unit ________. - ANSWER-the refrigerant should be
recovered to or isolated in the receiver
16. A very large refrigerant leak can cause suffocation because refrigerants _________. -
ANSWER-are heavier than air and displace oxygen
17. According to the EPA, when all the R-123 liquid has been removed from an average
350-ton R-123 chiller and the system vapor pressure is 0 psig, the system contains
_______. - ANSWER-100 pounds of refrigerant in the system
