EPA 608 Exam Practice Questions 1-
100 with correct answers graded a+
for 2026
1. Ozone depletion is caused by _______ in HFC refrigerants. - CORRECT ANSWERS-
chlorine
2. CFCs and HCFCs ________ making them capable capable of reaching the stratospheric
ozone layer. - CORRECT ANSWERS-do not dissolve in water or easily break down in the
atmosphere
3. According to the Rolanda-Molina theory, ________ are destroyed by each chlorine atom
in the stratosphere. - CORRECT ANSWERS-100,000 ozone molecules
4. The stratospheric ozone layer protects us from _______. - CORRECT ANSWERS-
ultraviolet radiation from the sun
5. Which health effect increases from loss of the stratospheric ozone layer? - CORRECT
ANSWERS-cases of cataracts or skin cancer
6. What proves that HCFCs are in the stratosphere? - CORRECT ANSWERS-HCFCs found in
air samples from the stratosphere.
7. What makes HFC refrigerants damaging to the environment? - CORRECT ANSWERS-They
can have very high global warming potentials.
8. _______ makes HFO refrigerants less flammable than HC refrigerants. - CORRECT
ANSWERS-Flourine
, 9. Which refrigerant contains chlorine? - CORRECT ANSWERS-R-12
10. HFO refrigerants are miscible in _______ lubricants. - CORRECT ANSWERS-POE
lubricants
11. An example of HcFC refrigerant is: ______ - CORRECT ANSWERS-R-123
12. What is being done in the U.S. to stop damage to the stratospheric ozone layer? -
CORRECT ANSWERS-Eliminating the use of CFCs and HCFCs refrigerants
13. EPA regulations require appliances to have _________. - CORRECT ANSWERS-a service
aperture or process hub
14. The release of any CFC, HCFC, or HFC refrigerant during _________ is illegal. - CORRECT
ANSWERS-theft of equipment
15. ____________ is the only EPA SNAP approved "drop in" replacement for
16. R-22. - CORRECT ANSWERS-There are no direct drop-in refrigerant substitutes
17. Ester-based oils like POE can be mixed with ________. - CORRECT ANSWERS-no other
oils
18. What provides the cooling in a vapor compression refrigeration system? - CORRECT
ANSWERS-The vaporization of the liquid refrigerant
19. An oil sample might be taken when __________. - CORRECT ANSWERS-a. moisture
and/or acid problems are suspected
20. b. oil sludge formation or oil waxing is suspected
100 with correct answers graded a+
for 2026
1. Ozone depletion is caused by _______ in HFC refrigerants. - CORRECT ANSWERS-
chlorine
2. CFCs and HCFCs ________ making them capable capable of reaching the stratospheric
ozone layer. - CORRECT ANSWERS-do not dissolve in water or easily break down in the
atmosphere
3. According to the Rolanda-Molina theory, ________ are destroyed by each chlorine atom
in the stratosphere. - CORRECT ANSWERS-100,000 ozone molecules
4. The stratospheric ozone layer protects us from _______. - CORRECT ANSWERS-
ultraviolet radiation from the sun
5. Which health effect increases from loss of the stratospheric ozone layer? - CORRECT
ANSWERS-cases of cataracts or skin cancer
6. What proves that HCFCs are in the stratosphere? - CORRECT ANSWERS-HCFCs found in
air samples from the stratosphere.
7. What makes HFC refrigerants damaging to the environment? - CORRECT ANSWERS-They
can have very high global warming potentials.
8. _______ makes HFO refrigerants less flammable than HC refrigerants. - CORRECT
ANSWERS-Flourine
, 9. Which refrigerant contains chlorine? - CORRECT ANSWERS-R-12
10. HFO refrigerants are miscible in _______ lubricants. - CORRECT ANSWERS-POE
lubricants
11. An example of HcFC refrigerant is: ______ - CORRECT ANSWERS-R-123
12. What is being done in the U.S. to stop damage to the stratospheric ozone layer? -
CORRECT ANSWERS-Eliminating the use of CFCs and HCFCs refrigerants
13. EPA regulations require appliances to have _________. - CORRECT ANSWERS-a service
aperture or process hub
14. The release of any CFC, HCFC, or HFC refrigerant during _________ is illegal. - CORRECT
ANSWERS-theft of equipment
15. ____________ is the only EPA SNAP approved "drop in" replacement for
16. R-22. - CORRECT ANSWERS-There are no direct drop-in refrigerant substitutes
17. Ester-based oils like POE can be mixed with ________. - CORRECT ANSWERS-no other
oils
18. What provides the cooling in a vapor compression refrigeration system? - CORRECT
ANSWERS-The vaporization of the liquid refrigerant
19. An oil sample might be taken when __________. - CORRECT ANSWERS-a. moisture
and/or acid problems are suspected
20. b. oil sludge formation or oil waxing is suspected
