Low GWP Refrigerant Exam Questions and
Answers Questions with Solutions Newest
2026-2027 | Already Graded A+
1. Which of the following refrigerants has the lowest global warming potential
(GWP)?
R-32
R-290
R-404A
R-454B
ANSWER: R-290
2. Which of the following should be done prior to beginning the recovery process?
Change the oil in the vacuum pump.
Inform local authority having jurisdiction.
Purge air from the refrigerant hoses to prevent refrigerant contamination.
Vent the contents of the recovery tank to ensure it is empty.
ANSWER: Purge air from the refrigerant hoses to prevent refrigerant
contamination.
3. When working with A2L refrigerants, which one of the following is not an
approved leak detection method?
Electronic leak detector.
Halide leak detector.
Microfoam solution (bubbles).
Ultrasonic leak detector.
ANSWER: Halide leak detector.
,4. When brazing a system that has been charged with an A2L refrigerant:
NFPA 704 hazard placards must be placed in visible locations around the
perimeter of the jobsite.
The refrigerant tubing should be pressurized with air to stabilize the inner walls.
The system charge must be vented to the atmosphere before beginning.
The system should be swept with nitrogen to ensure that there is no residual
refrigerant.
ANSWER: The system should be swept with nitrogen to ensure that there is no
residual refrigerant.
5. Refrigerants that have a lowercase designation, such as R-134a, indicates a(n):
Azeotrope blend.
Isomer.
Olefin.
Zeotrope blend.
ANSWER: Isomer.
6. What is the maximum GWP allowed for new residential air conditioning
systems under EPA SNAP Rule 23?
750
150
700
100
ANSWER: 750
7. Which of the following refrigerants is classified as A3 (highly flammable)?
R-32
R-454B
,R-290
R-1234yf
ANSWER: R-290
8. What does the "L" in A2L refrigerant classification stand for?
Low toxicity
Low flammability
Low GWP
Low pressure
ANSWER: Low flammability
9. Which of the following is a required safety measure when working with A2L
refrigerants?
Continuous ventilation of the work area
Flame ionization detector at all times
Full face respirator
Lead apron
ANSWER: Continuous ventilation of the work area
10. What is the GWP of R-1234yf (based on 100-year ITH)?
4
1
1430
675
ANSWER: 1
11. When recovering refrigerant from a system containing an A2L refrigerant, the
recovery cylinder must be:
, White with a yellow top
Gray with a yellow band
Any color as long as it is labeled
Green with a white band
ANSWER: Gray with a yellow band
12. What is the primary reason for purging hoses before connecting recovery
equipment?
To prevent moisture from entering the system
To prevent non-condensables from entering the recovery tank
To cool the recovery machine
To test hose integrity
ANSWER: To prevent non-condensables from entering the recovery tank
13. Which of the following is the correct safety group classification for R-32?
A2L
A3
B2L
A1
ANSWER: A2L
14. What is the maximum allowable charge size for an A2L refrigerant in a
residential split system without additional safety devices?
4 lb (1.8 kg)
10 lb (4.5 kg)
15 lb (6.8 kg)
25 lb (11.3 kg)
ANSWER: 4 lb (1.8 kg)
Answers Questions with Solutions Newest
2026-2027 | Already Graded A+
1. Which of the following refrigerants has the lowest global warming potential
(GWP)?
R-32
R-290
R-404A
R-454B
ANSWER: R-290
2. Which of the following should be done prior to beginning the recovery process?
Change the oil in the vacuum pump.
Inform local authority having jurisdiction.
Purge air from the refrigerant hoses to prevent refrigerant contamination.
Vent the contents of the recovery tank to ensure it is empty.
ANSWER: Purge air from the refrigerant hoses to prevent refrigerant
contamination.
3. When working with A2L refrigerants, which one of the following is not an
approved leak detection method?
Electronic leak detector.
Halide leak detector.
Microfoam solution (bubbles).
Ultrasonic leak detector.
ANSWER: Halide leak detector.
,4. When brazing a system that has been charged with an A2L refrigerant:
NFPA 704 hazard placards must be placed in visible locations around the
perimeter of the jobsite.
The refrigerant tubing should be pressurized with air to stabilize the inner walls.
The system charge must be vented to the atmosphere before beginning.
The system should be swept with nitrogen to ensure that there is no residual
refrigerant.
ANSWER: The system should be swept with nitrogen to ensure that there is no
residual refrigerant.
5. Refrigerants that have a lowercase designation, such as R-134a, indicates a(n):
Azeotrope blend.
Isomer.
Olefin.
Zeotrope blend.
ANSWER: Isomer.
6. What is the maximum GWP allowed for new residential air conditioning
systems under EPA SNAP Rule 23?
750
150
700
100
ANSWER: 750
7. Which of the following refrigerants is classified as A3 (highly flammable)?
R-32
R-454B
,R-290
R-1234yf
ANSWER: R-290
8. What does the "L" in A2L refrigerant classification stand for?
Low toxicity
Low flammability
Low GWP
Low pressure
ANSWER: Low flammability
9. Which of the following is a required safety measure when working with A2L
refrigerants?
Continuous ventilation of the work area
Flame ionization detector at all times
Full face respirator
Lead apron
ANSWER: Continuous ventilation of the work area
10. What is the GWP of R-1234yf (based on 100-year ITH)?
4
1
1430
675
ANSWER: 1
11. When recovering refrigerant from a system containing an A2L refrigerant, the
recovery cylinder must be:
, White with a yellow top
Gray with a yellow band
Any color as long as it is labeled
Green with a white band
ANSWER: Gray with a yellow band
12. What is the primary reason for purging hoses before connecting recovery
equipment?
To prevent moisture from entering the system
To prevent non-condensables from entering the recovery tank
To cool the recovery machine
To test hose integrity
ANSWER: To prevent non-condensables from entering the recovery tank
13. Which of the following is the correct safety group classification for R-32?
A2L
A3
B2L
A1
ANSWER: A2L
14. What is the maximum allowable charge size for an A2L refrigerant in a
residential split system without additional safety devices?
4 lb (1.8 kg)
10 lb (4.5 kg)
15 lb (6.8 kg)
25 lb (11.3 kg)
ANSWER: 4 lb (1.8 kg)
