EPA 608 – CORE EXAM QUESTIONS AND
ANSWERS 100% PASS.
What does ozone in the stratosphere above earth consist of?
A. Molecules containing 2 oxygen atoms.
B. Molecules containing 3 oxygen atoms.
C. Molecules containing 4 oxygen atoms.
D. Molecules containing 5 oxygen atoms. - ANS B. Molecules containing 3 oxygen atoms.
Which of the following refrigerants has the lowest global warming potential?
A. R-134a
B. R-407C
C. R-410A
D. R-600a - ANS D. R-600a
Which of the following gases is used as the baseline measurement for global warming
potential?
A. Ammonia
B. Carbon Dioxide
C. CFC-12
D. Propane - ANS B. Carbon Dioxide
Which type of refrigerant typically has the lowest global warming potential?
2026 STUDY MATERIAL @COPYRIGHT RESERVED 1
,A. HCFCs
B. HFOs
C. HFCs
D. All are equal - ANS B. HFOs
what is the state of the refrigerant entering the compressor of a refrigeration system?
A. Low pressure liquid
B. Low pressure vapor
C. High pressure liquid
D. High pressure vapor - ANS B. Low pressure vapor
Why are HFO refrigerants less flammable than hydrocarbon refrigerants?
A. They contain chlorine.
B. They contain bromine.
C. They contain fluorine.
D. They contain carbon. - ANS C. They contain fluorine.
What does a section 608 certification allow a technician to do?
A. Import R-22 from overseas.
B. Purchase or handle controlled refrigerants.
C. Service motor vehicle air conditioners.
D. Perform any type of work on any type of HVACR equipment. - ANS B. Purchase or handle
controlled refrigerants.
Which type of refrigerant has the highest ozone depletion potential (ODP)?
A. HCFCs
B. HFCs
C. CFCs
2026 STUDY MATERIAL @COPYRIGHT RESERVED 2
, D. HFOs - ANS A. HCFCs
Which of the following refrigerants contains chlorine?
A. R-22
B. R-134a
c. R-410A
D. 1234yf - ANS A. R-22
HFC refrigerants contain which of the following?
A. Chlorine, fluorine & carbon
B. Chlorine, fluorine & hydrogen
C. Hydrogen, chlorine & carbon
D. Hydrogen, fluorine & carbon - ANS D. Hydrogen, fluorine & carbon
What is being done in the U.S. to stop damage to the stratospheric ozone layer?
A. Using natural gas instead of coal to generate electricity.
B. Phasing out the use of chlorofluorocarbons and hydrochlorofluorocarbons.
C. Enforcing strict emission requirements on incinerators.
D. Increasing the energy efficiency of air conditioners. - ANS B. Phasing out the use of
chlorofluorocarbons and hydrochlorofluorocarbons.
How should disposable cylinders of CFCs, HCFCs, and HFCs be discarded?
A. Bleed any remaining refrigerant to ambient air and put the cylinders into a trash dumpster.
B. Recover all remaining refrigerant, render the cylinders useless and recycle the metal.
C. refill the cylinders at an approved facility and reuse.
D. Reuse the cylinder as recovery tanks. - ANS B. Recover all remaining refrigerant, render the
cylinders useless and recycle the metal.
2026 STUDY MATERIAL @COPYRIGHT RESERVED 3
ANSWERS 100% PASS.
What does ozone in the stratosphere above earth consist of?
A. Molecules containing 2 oxygen atoms.
B. Molecules containing 3 oxygen atoms.
C. Molecules containing 4 oxygen atoms.
D. Molecules containing 5 oxygen atoms. - ANS B. Molecules containing 3 oxygen atoms.
Which of the following refrigerants has the lowest global warming potential?
A. R-134a
B. R-407C
C. R-410A
D. R-600a - ANS D. R-600a
Which of the following gases is used as the baseline measurement for global warming
potential?
A. Ammonia
B. Carbon Dioxide
C. CFC-12
D. Propane - ANS B. Carbon Dioxide
Which type of refrigerant typically has the lowest global warming potential?
2026 STUDY MATERIAL @COPYRIGHT RESERVED 1
,A. HCFCs
B. HFOs
C. HFCs
D. All are equal - ANS B. HFOs
what is the state of the refrigerant entering the compressor of a refrigeration system?
A. Low pressure liquid
B. Low pressure vapor
C. High pressure liquid
D. High pressure vapor - ANS B. Low pressure vapor
Why are HFO refrigerants less flammable than hydrocarbon refrigerants?
A. They contain chlorine.
B. They contain bromine.
C. They contain fluorine.
D. They contain carbon. - ANS C. They contain fluorine.
What does a section 608 certification allow a technician to do?
A. Import R-22 from overseas.
B. Purchase or handle controlled refrigerants.
C. Service motor vehicle air conditioners.
D. Perform any type of work on any type of HVACR equipment. - ANS B. Purchase or handle
controlled refrigerants.
Which type of refrigerant has the highest ozone depletion potential (ODP)?
A. HCFCs
B. HFCs
C. CFCs
2026 STUDY MATERIAL @COPYRIGHT RESERVED 2
, D. HFOs - ANS A. HCFCs
Which of the following refrigerants contains chlorine?
A. R-22
B. R-134a
c. R-410A
D. 1234yf - ANS A. R-22
HFC refrigerants contain which of the following?
A. Chlorine, fluorine & carbon
B. Chlorine, fluorine & hydrogen
C. Hydrogen, chlorine & carbon
D. Hydrogen, fluorine & carbon - ANS D. Hydrogen, fluorine & carbon
What is being done in the U.S. to stop damage to the stratospheric ozone layer?
A. Using natural gas instead of coal to generate electricity.
B. Phasing out the use of chlorofluorocarbons and hydrochlorofluorocarbons.
C. Enforcing strict emission requirements on incinerators.
D. Increasing the energy efficiency of air conditioners. - ANS B. Phasing out the use of
chlorofluorocarbons and hydrochlorofluorocarbons.
How should disposable cylinders of CFCs, HCFCs, and HFCs be discarded?
A. Bleed any remaining refrigerant to ambient air and put the cylinders into a trash dumpster.
B. Recover all remaining refrigerant, render the cylinders useless and recycle the metal.
C. refill the cylinders at an approved facility and reuse.
D. Reuse the cylinder as recovery tanks. - ANS B. Recover all remaining refrigerant, render the
cylinders useless and recycle the metal.
2026 STUDY MATERIAL @COPYRIGHT RESERVED 3
