EPA 608 Core Test – Sample Questions and Revised Answers for 2026/2027 Exam Preparation

EPA 608 Core Test Sample Questions and
Revised Answers – Latest Verified


1. As of what date did it become unlawful to release Class 1 and Class II refrigerants to
the atmosphere?
a. July 1, 1992
b. July 1, 1993
c. November 14, 1994
d. January 1, 1996: a. July 1, 1992
2. What is the ozone layer and why is it important to us on Earth?
a. Thin layer of R-22 in the atmosphere that filters UV.
b. Protective shield for Earth from the sun's harmful ultraviolent (UV) rays in the
stratosphere layer that extends about 6 to 30 miles above earth
c. Thin layer of CFC and HCFC in the atmosphere that filters UV.
d. Protective layer that shields UV in the Troposphere: b. Protective shield for Earth from
the sun's harmful ultraviolent (UV)
rays in the stratosphere layer that extends about 6 to 30 miles above earth
3. The atom found in CFC and HCFC refrigerants that destroys ozone in the stratosphere
is?
a. Fluorine
b. Carbon
c. Hydrogen
d. Chlorine: d. Chlorine
4. What is an ozone molecule made of?
a. Refrigerant
b. Ammonia


,c. Three oxygen atoms (O3).
d. Oxygen and ammonia.: Three oxygen atoms (O3).
5. Which refrigerant is a CFC?
a. R-134A
b. R-123
c. R-22
d. R-12: d. R-12






,6. What is the name of the atom that attacḱs ozone molecules?
a. CFC atoms
b. HCFC atoms
c. Chlorine and bromine atoms emitted into the atmosphere
d. a and b: c. Chlorine and bromine atoms emitted into the atmosphere
7. Which refrigerant is a HFC?
a. R-134A
b. R-123
c. R-22
d. R-12: a. R-134A
8. Describe how one Chlorine atom can destroy 100,000 ozone molecules.
a. Chlorine releases one of the oxygen atoms and forms two O2 oxygen molecules,
leaving the chlorine molecule free to attacḱ another
ozone molecule and repeat the process.
b. Chlorine locḱs up the ozone molecule and then and then goes after another.
c. Chlorine converts the ozone to bromine and then attacḱs more ozone molecules.
d. Chlorine can bleach 100,000 ozone molecules before it weaḱens.: a. Chlorine
releases one of the oxygen atoms and forms two O2 oxygen molecules, leaving the chlorine molecule free to attacḱ another
ozone molecule and repeat the process.
9. Which refrigerant contains no chlorine?
a. R-134A
b. R-123
c. R-22
d. R-12: a. R-134A
10. Name the refrigerant types that belong to CFCs, HCFCs and HFCs
a. CFC R-11, R-12, R-500
b. HCFC R-22, R-123
c. HFC R-134a
d. All of the above are correct: d. All of the above are correct


, 11. The rule of thumb for refilling approved cylinders is a maximum of
percent liquid?
a. 60%
b. 79%
c. 80%
d. 90%: c. 80%
12. What do the letters in "HCFC" stand for?
a. High Carbon Fluorine Chlorine
b. hydrochlorofluorocarbons
c. Harmful Carbon Fluorine Chlorine
d. highchlorinefluorocarbon: b. hydrochlorofluorocarbons
13. To recover refrigerant is to?
a. Remove a refrigerant in any condition from a system in either an active or
passive manner, and store it in an external container without necessarily testing
or processing
b. Reduce contaminants in used refrigerant by oil separation through filter dryers.
c. Reprocess refrigerant to new product specifications
d. Remove refrigerant and change ownership.: a. Remove a refrigerant in any condition from
a system in either an
active or passive manner, and store it in an external container without
necessarily testing or processing
14. What is ODP?
a. Oxygen Destruction Properties
b. Ozone Depletion Potential
c. Ozone Destruction Properties
d. Oxygen Depletion Potential: b. Ozone Depletion Potential
15. R-134A is a "drop in" refrigerant for? 36 | P a
ge
a. R-12