Epa universal SkillCat Exam Questions With Complete Solutions
SkillCat
1. Which refrigerant has ozone depletion potential (ODP)?
A. R-134a
B. R-404A
C. R-410A
D. R-22
Answer: D. R-22
Solution: R-22 is an HCFC and still damages the ozone layer. HFC refrigerants such as R-134a,
R-404A, and R-410A have zero ODP.
2. Why must air and moisture be removed from a refrigeration system before
charging?
A. To improve cooling capacity
B. To prevent acid formation and high head pressure
C. To reduce refrigerant cost
D. To meet manufacturer warranty requirements
Answer: B
Solution: Air is a non-condensable and moisture causes acid, corrosion, and ice. Evacuation
removes both.
3. What is the maximum level a recovery cylinder may be filled?
A. 60%
B. 70%
C. 80%
D. 100%
Answer: C. 80%
Solution: Refrigerant expands when heated. Filling beyond 80% can cause cylinder rupture.
4. EPA regulations require refrigerant recovery because refrigerants:
A. Are expensive
B. Damage compressors
C. Harm the environment
D. Reduce system efficiency
SkillCat
1. Which refrigerant has ozone depletion potential (ODP)?
A. R-134a
B. R-404A
C. R-410A
D. R-22
Answer: D. R-22
Solution: R-22 is an HCFC and still damages the ozone layer. HFC refrigerants such as R-134a,
R-404A, and R-410A have zero ODP.
2. Why must air and moisture be removed from a refrigeration system before
charging?
A. To improve cooling capacity
B. To prevent acid formation and high head pressure
C. To reduce refrigerant cost
D. To meet manufacturer warranty requirements
Answer: B
Solution: Air is a non-condensable and moisture causes acid, corrosion, and ice. Evacuation
removes both.
3. What is the maximum level a recovery cylinder may be filled?
A. 60%
B. 70%
C. 80%
D. 100%
Answer: C. 80%
Solution: Refrigerant expands when heated. Filling beyond 80% can cause cylinder rupture.
4. EPA regulations require refrigerant recovery because refrigerants:
A. Are expensive
B. Damage compressors
C. Harm the environment
D. Reduce system efficiency
