EPA 608 Core Test Sample Questions and
answers 2024\2025 A+ Grade
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 answer 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 answer 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 answer d. Chlorine
What is an ozone molecule made of?
a. Refrigerant
b. Ammonia
c. Three oxygen atoms (O3).
d. Oxygen and ammonia.
- correct answer Three oxygen atoms (O3).
Which refrigerant is a CFC?
a. R-134A
b. R-123
c. R-22
d. R-12
- correct answer 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 answer 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 answer 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 answer 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 answer 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 answer 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 answer 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 answer 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 answer 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
answers 2024\2025 A+ Grade
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 answer 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 answer 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 answer d. Chlorine
What is an ozone molecule made of?
a. Refrigerant
b. Ammonia
c. Three oxygen atoms (O3).
d. Oxygen and ammonia.
- correct answer Three oxygen atoms (O3).
Which refrigerant is a CFC?
a. R-134A
b. R-123
c. R-22
d. R-12
- correct answer 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 answer 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 answer 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 answer 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 answer 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 answer 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 answer 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 answer 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 answer 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
