EPA 608 CORE Exam Questions with Answers
(A+ Guarantee)
1. What does ozone in the stratosphere above the 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
Answer: b. Molecules containing 3 oxygen atoms.
2. Which of the following refrigerants has the lowest global warming poten-
tial?
a. R-134a
b. R-407C
c. R-410A
,d. R-600a
Answer: d. R-600a
3. 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
Answer: b. Carbon Dioxide
4. Which type of refrigerant typically has the lowest global warming potential?
a. HCFCs
b. HFOs
c. HFCs
d. All are equal
Answer: b. HFOs
5. What is the state of refrigerant entering the compressor of a refrigeration
system?
a. Low pressure subcooled liquid
,b. Low pressure superheated vapor
c. High pressure subcooled liquid
d. High pressure subcooled vapor
Answer: b. Low pressure superheated vapor
6. How does the global warming potential of R-410A compare to that of carbon
dioxide?
a. It is lower.
b. They are equal.
c. It is hundreds of times greater.
d. It is thousands of times greater.
Answer: d. It is thousands of times greater.
7. How do the global warming potentials of isobutane
(R-600a), propane (R-290), and R-441A compare to
the GWPs of HFC-134a, R404A, and R-410A?
a. They are significantly higher.
b. They are significantly lower.
c. They are approximately equal
d. They are slightly higher.
, Answer: b. They are significantly lower.
8. What are the characteristics of hydrofluoroolefins (HFOs)?
a. Non-ozone depleting and have high global warming potentials.
b. Non-ozone depleting and have low global warming potentials.
c. Ozone depleting and have high global warming potentials.
d. Ozone depleting and have low global warming potentials.
Answer: b. Non-ozone depleting and have low global
warming potentials.
9. 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.
Answer: c. They contain fluorine.
10. Which of the following refrigerants is an HFO?
a. R-1234yf
b. R-123
(A+ Guarantee)
1. What does ozone in the stratosphere above the 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
Answer: b. Molecules containing 3 oxygen atoms.
2. Which of the following refrigerants has the lowest global warming poten-
tial?
a. R-134a
b. R-407C
c. R-410A
,d. R-600a
Answer: d. R-600a
3. 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
Answer: b. Carbon Dioxide
4. Which type of refrigerant typically has the lowest global warming potential?
a. HCFCs
b. HFOs
c. HFCs
d. All are equal
Answer: b. HFOs
5. What is the state of refrigerant entering the compressor of a refrigeration
system?
a. Low pressure subcooled liquid
,b. Low pressure superheated vapor
c. High pressure subcooled liquid
d. High pressure subcooled vapor
Answer: b. Low pressure superheated vapor
6. How does the global warming potential of R-410A compare to that of carbon
dioxide?
a. It is lower.
b. They are equal.
c. It is hundreds of times greater.
d. It is thousands of times greater.
Answer: d. It is thousands of times greater.
7. How do the global warming potentials of isobutane
(R-600a), propane (R-290), and R-441A compare to
the GWPs of HFC-134a, R404A, and R-410A?
a. They are significantly higher.
b. They are significantly lower.
c. They are approximately equal
d. They are slightly higher.
, Answer: b. They are significantly lower.
8. What are the characteristics of hydrofluoroolefins (HFOs)?
a. Non-ozone depleting and have high global warming potentials.
b. Non-ozone depleting and have low global warming potentials.
c. Ozone depleting and have high global warming potentials.
d. Ozone depleting and have low global warming potentials.
Answer: b. Non-ozone depleting and have low global
warming potentials.
9. 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.
Answer: c. They contain fluorine.
10. Which of the following refrigerants is an HFO?
a. R-1234yf
b. R-123
