EPA 608 CORE EXAM 2025 WITH 100% ACCURATE
SOLUTIONS
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 - ✅✅✅CORRECT -a. July 1, 1992
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 - ✅✅✅CORRECT -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
The atom found in CFC and HCFC refrigerants that destroys ozone in the
stratosphere is?
a. Fluorine
b. Carbon
c. Hydrogen
d. Chlorine - ✅✅✅CORRECT -d. Chlorine
,What is an ozone molecule made of?
a. Refrigerant
b. Ammonia
c. Three oxygen atoms (O3).
d. Oxygen and ammonia. - ✅✅✅CORRECT -Three oxygen atoms (O3).
Which refrigerant is a CFC?
a. R-134A
b. R-123
c. R-22
d. R-12 - ✅✅✅CORRECT -d. R-12
What is the name of the atom that attacks ozone molecules?
a. CFC atoms
b. HCFC atoms
c. Chlorine and bromine atoms emitted into the atmosphere
d. a and b - ✅✅✅CORRECT -c. Chlorine and bromine atoms emitted into the atmosphere
Which refrigerant is a HFC?
a. R-134A
b. R-123
c. R-22
d. R-12 - ✅✅✅CORRECT -a. R-134A
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 attack another
ozone molecule and repeat the process.
b. Chlorine locks up the ozone molecule and then and then goes after
,another.
c. Chlorine converts the ozone to bromine and then attacks more ozone
molecules.
d. Chlorine can bleach 100,000 ozone molecules before it weakens. - ✅✅✅CORRECT -a. Chlorine
releases one of the oxygen atoms and forms two O2 oxygen molecules, leaving the chlorine molecule
free to attack another
ozone molecule and repeat the process.
Which refrigerant contains no chlorine?
a. R-134A
b. R-123
c. R-22
d. R-12 - ✅✅✅CORRECT -a. R-134A
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 - ✅✅✅CORRECT -d. All of the above are correct
The rule of thumb for refilling approved cylinders is a maximum of ___ percent
liquid?
a. 60%
b. 79%
c. 80%
d. 90% - ✅✅✅CORRECT -c. 80%
What do the letters in "HCFC" stand for?
a. High Carbon Fluorine Chlorine
, b. hydrochlorofluorocarbons
c. Harmful Carbon Fluorine Chlorine
d. highchlorinefluorocarbon - ✅✅✅CORRECT -b. hydrochlorofluorocarbons
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. - ✅✅✅CORRECT -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
What is ODP?
a. Oxygen Destruction Properties
b. Ozone Depletion Potential
c. Ozone Destruction Properties
d. Oxygen Depletion Potential - ✅✅✅CORRECT -b. Ozone Depletion Potential
R-134A is a "drop in" refrigerant for?
36 | P a g e
a. R-12
b. R-22
c. R-11
d. R-134A is not a drop-in refrigerant - ✅✅✅CORRECT -d. R-134A is not a drop-in refrigerant
SOLUTIONS
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 - ✅✅✅CORRECT -a. July 1, 1992
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 - ✅✅✅CORRECT -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
The atom found in CFC and HCFC refrigerants that destroys ozone in the
stratosphere is?
a. Fluorine
b. Carbon
c. Hydrogen
d. Chlorine - ✅✅✅CORRECT -d. Chlorine
,What is an ozone molecule made of?
a. Refrigerant
b. Ammonia
c. Three oxygen atoms (O3).
d. Oxygen and ammonia. - ✅✅✅CORRECT -Three oxygen atoms (O3).
Which refrigerant is a CFC?
a. R-134A
b. R-123
c. R-22
d. R-12 - ✅✅✅CORRECT -d. R-12
What is the name of the atom that attacks ozone molecules?
a. CFC atoms
b. HCFC atoms
c. Chlorine and bromine atoms emitted into the atmosphere
d. a and b - ✅✅✅CORRECT -c. Chlorine and bromine atoms emitted into the atmosphere
Which refrigerant is a HFC?
a. R-134A
b. R-123
c. R-22
d. R-12 - ✅✅✅CORRECT -a. R-134A
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 attack another
ozone molecule and repeat the process.
b. Chlorine locks up the ozone molecule and then and then goes after
,another.
c. Chlorine converts the ozone to bromine and then attacks more ozone
molecules.
d. Chlorine can bleach 100,000 ozone molecules before it weakens. - ✅✅✅CORRECT -a. Chlorine
releases one of the oxygen atoms and forms two O2 oxygen molecules, leaving the chlorine molecule
free to attack another
ozone molecule and repeat the process.
Which refrigerant contains no chlorine?
a. R-134A
b. R-123
c. R-22
d. R-12 - ✅✅✅CORRECT -a. R-134A
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 - ✅✅✅CORRECT -d. All of the above are correct
The rule of thumb for refilling approved cylinders is a maximum of ___ percent
liquid?
a. 60%
b. 79%
c. 80%
d. 90% - ✅✅✅CORRECT -c. 80%
What do the letters in "HCFC" stand for?
a. High Carbon Fluorine Chlorine
, b. hydrochlorofluorocarbons
c. Harmful Carbon Fluorine Chlorine
d. highchlorinefluorocarbon - ✅✅✅CORRECT -b. hydrochlorofluorocarbons
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. - ✅✅✅CORRECT -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
What is ODP?
a. Oxygen Destruction Properties
b. Ozone Depletion Potential
c. Ozone Destruction Properties
d. Oxygen Depletion Potential - ✅✅✅CORRECT -b. Ozone Depletion Potential
R-134A is a "drop in" refrigerant for?
36 | P a g e
a. R-12
b. R-22
c. R-11
d. R-134A is not a drop-in refrigerant - ✅✅✅CORRECT -d. R-134A is not a drop-in refrigerant
