EPA-608 Type II Certification Practice Exam Questions And
Correct Answers (Verified Answers) Plus Rationales 2025|2026
Q&A | Instant Download Pdf
1. Which of the following is a common refrigerant used in high-pressure
systems?
A. R-134a
B. R-410A
C. R-12
D. R-22
R-410A is a high-pressure refrigerant commonly used in modern air
conditioning systems.
2. What does the term "subcooling" refer to in a refrigeration system?
A. Temperature of refrigerant at the compressor
B. Temperature of liquid refrigerant below its saturation point
C. Temperature of refrigerant at evaporator inlet
, D. Temperature rise across expansion device
Subcooling indicates the liquid refrigerant is below its condensing
temperature, ensuring proper expansion and preventing flash gas.
3. What is the primary purpose of a receiver in a high-pressure system?
A. Increase system pressure
B. Store excess liquid refrigerant
C. Remove moisture from refrigerant
D. Act as a filter
A receiver stores extra liquid refrigerant and ensures the evaporator
receives liquid rather than vapor.
4. What is the correct method for recovering refrigerant from a high-
pressure system?
A. Vent it outdoors
B. Release into atmosphere
C. Use an approved recovery unit
D. Burn it
EPA regulations require using an approved recovery/recycling
machine to prevent ozone depletion.
5. What is considered a "high-pressure" refrigerant according to EPA
standards?
A. R-12
B. R-410A
C. R-134a
, D. Ammonia
High-pressure refrigerants have higher operating pressures and
require specialized equipment for service.
6. Which of the following tools is essential for charging a high-pressure
system?
A. Pipe wrench
B. Screwdriver
C. Manifold gauge set
D. Thermometer
Manifold gauges measure system pressures to properly charge and
diagnose high-pressure systems.
7. Why is it important to avoid overcharging a refrigeration system?
A. Reduces efficiency
B. Can cause high pressures and system failure
C. Lowers refrigerant temperature
D. Improves lubrication
Overcharging increases pressure, which can damage components or
cause leaks.
8. What is the main function of a thermostatic expansion valve (TXV)?
A. Increase system pressure
B. Regulate refrigerant flow to evaporator
C. Filter refrigerant
D. Remove air from system
, The TXV controls refrigerant entering the evaporator based on
cooling load, improving efficiency.
9. When should a nitrogen system be used in refrigeration service?
A. For pressure testing or purging
B. For cooling the compressor
C. For charging refrigerant
D. For removing oil
Nitrogen is used to pressurize systems to check for leaks and to purge
contaminants.
10. Which of the following indicates a refrigerant leak in a system?
A. Rising pressure
B. Low temperature
C. Oil residue around fittings
D. Compressor noise
Oil often escapes with leaking refrigerant, leaving residue around
leaks.
11. How should a high-pressure system be evacuated before
charging?
A. Release pressure slowly
B. Use a vacuum pump to remove air and moisture
C. Open service valves
D. Heat the compressor
Correct Answers (Verified Answers) Plus Rationales 2025|2026
Q&A | Instant Download Pdf
1. Which of the following is a common refrigerant used in high-pressure
systems?
A. R-134a
B. R-410A
C. R-12
D. R-22
R-410A is a high-pressure refrigerant commonly used in modern air
conditioning systems.
2. What does the term "subcooling" refer to in a refrigeration system?
A. Temperature of refrigerant at the compressor
B. Temperature of liquid refrigerant below its saturation point
C. Temperature of refrigerant at evaporator inlet
, D. Temperature rise across expansion device
Subcooling indicates the liquid refrigerant is below its condensing
temperature, ensuring proper expansion and preventing flash gas.
3. What is the primary purpose of a receiver in a high-pressure system?
A. Increase system pressure
B. Store excess liquid refrigerant
C. Remove moisture from refrigerant
D. Act as a filter
A receiver stores extra liquid refrigerant and ensures the evaporator
receives liquid rather than vapor.
4. What is the correct method for recovering refrigerant from a high-
pressure system?
A. Vent it outdoors
B. Release into atmosphere
C. Use an approved recovery unit
D. Burn it
EPA regulations require using an approved recovery/recycling
machine to prevent ozone depletion.
5. What is considered a "high-pressure" refrigerant according to EPA
standards?
A. R-12
B. R-410A
C. R-134a
, D. Ammonia
High-pressure refrigerants have higher operating pressures and
require specialized equipment for service.
6. Which of the following tools is essential for charging a high-pressure
system?
A. Pipe wrench
B. Screwdriver
C. Manifold gauge set
D. Thermometer
Manifold gauges measure system pressures to properly charge and
diagnose high-pressure systems.
7. Why is it important to avoid overcharging a refrigeration system?
A. Reduces efficiency
B. Can cause high pressures and system failure
C. Lowers refrigerant temperature
D. Improves lubrication
Overcharging increases pressure, which can damage components or
cause leaks.
8. What is the main function of a thermostatic expansion valve (TXV)?
A. Increase system pressure
B. Regulate refrigerant flow to evaporator
C. Filter refrigerant
D. Remove air from system
, The TXV controls refrigerant entering the evaporator based on
cooling load, improving efficiency.
9. When should a nitrogen system be used in refrigeration service?
A. For pressure testing or purging
B. For cooling the compressor
C. For charging refrigerant
D. For removing oil
Nitrogen is used to pressurize systems to check for leaks and to purge
contaminants.
10. Which of the following indicates a refrigerant leak in a system?
A. Rising pressure
B. Low temperature
C. Oil residue around fittings
D. Compressor noise
Oil often escapes with leaking refrigerant, leaving residue around
leaks.
11. How should a high-pressure system be evacuated before
charging?
A. Release pressure slowly
B. Use a vacuum pump to remove air and moisture
C. Open service valves
D. Heat the compressor
