Low GWP
Low GWP Quiz Exam Questions and
Answers Graded A+ 2026
The min. concentration of a refrig that can propagate a flame through consistent
mixture of the refrig. and air is; -Correct Answer ✔-C - lower flammability limit
(LFL).
2 - Refrigerant cylinders should be transported in the upright position to ensure; -
Correct Answer ✔-C - Pressure relief valve
3 - Tools used during the installation or service of systems charged with a
flammable refrigerant must be; -Correct Answer ✔-D - rated for use with
flammable refrigerants
4 - The first stage of the evacuation process which removes non-condensables from
a system is called; -Correct Answer ✔-A - Degassing
5 - Once a flammable refrigerant has been recovered and stored in a recovery
cylinder; -Correct Answer ✔-B - Safe Distances
6 - In a vapor-compression refrigeration circuit the term condensable is used to
describe; -Correct Answer ✔-B - any gas that will not condense to a liquid
7 - Which of the following can affect the speed and efficiency of an evacuation? -
Correct Answer ✔-A - The capacity of the vacuum pump and hoses being used.
8 - Which of the following refrigerants is exempt from the EPA's recovery
mandate? -Correct Answer ✔-B - R-290
Which one of the following refrigerants is classified as an A3 refrigerant? -Correct
Answer ✔-B - R-290
10 - Atmospheric pressure (0 psig) is equal to approximately; -Correct Answer ✔-
D - 760,000 Microns
Low GWP
, Low GWP
11 - To avoid fractionation, blended refrigerants should be; -Correct Answer ✔-A -
charged as a liquid
12 - An uppercase letter designation
(R-407A, R-407B, R-407C) is used when refrigerant blends are; -Correct Answer
✔-D - An uppercase letter designation
(R-407A, R-407B, R-407C) is used when refrigerant blends are;
13 - Flammable refrigerant cylinders must have a; -Correct Answer ✔-D - red band
on the top of the container.
14 - During the brazing process; -Correct Answer ✔-A - a low-pressure purge with
an inert gas, such as nitrogen, should be used.
15 - Which of the following refrigerant safety classifications is most hazardous in
terms of flammability and toxicity? -Correct Answer ✔-D - B3
16 - Which of the following refrigerants has the lowest global warming potential
(GWP)? -Correct Answer ✔-B - R-290
17 - Which of the following should be done prior to beginning the recovery
process? -Correct Answer ✔-C - Purge air from the refrigerant hoses to prevent
refrigerant contamination.
18 - When the manufacturer's literature is not available, the industry-accepted
evacuation level for most HVACR equipment is; -Correct Answer ✔-C - 500
Microns
19 - When working with A2L refrigerants, which one of the following is not an
approved leak detection method? -Correct Answer ✔-B - Halide Leak Detector
20 - When brazing a system that has been charged with an A2 refrigerant; -Correct
Answer ✔-D - system should be swept with nitrogen to ensure there is no residual
refrig.
Low GWP
Low GWP Quiz Exam Questions and
Answers Graded A+ 2026
The min. concentration of a refrig that can propagate a flame through consistent
mixture of the refrig. and air is; -Correct Answer ✔-C - lower flammability limit
(LFL).
2 - Refrigerant cylinders should be transported in the upright position to ensure; -
Correct Answer ✔-C - Pressure relief valve
3 - Tools used during the installation or service of systems charged with a
flammable refrigerant must be; -Correct Answer ✔-D - rated for use with
flammable refrigerants
4 - The first stage of the evacuation process which removes non-condensables from
a system is called; -Correct Answer ✔-A - Degassing
5 - Once a flammable refrigerant has been recovered and stored in a recovery
cylinder; -Correct Answer ✔-B - Safe Distances
6 - In a vapor-compression refrigeration circuit the term condensable is used to
describe; -Correct Answer ✔-B - any gas that will not condense to a liquid
7 - Which of the following can affect the speed and efficiency of an evacuation? -
Correct Answer ✔-A - The capacity of the vacuum pump and hoses being used.
8 - Which of the following refrigerants is exempt from the EPA's recovery
mandate? -Correct Answer ✔-B - R-290
Which one of the following refrigerants is classified as an A3 refrigerant? -Correct
Answer ✔-B - R-290
10 - Atmospheric pressure (0 psig) is equal to approximately; -Correct Answer ✔-
D - 760,000 Microns
Low GWP
, Low GWP
11 - To avoid fractionation, blended refrigerants should be; -Correct Answer ✔-A -
charged as a liquid
12 - An uppercase letter designation
(R-407A, R-407B, R-407C) is used when refrigerant blends are; -Correct Answer
✔-D - An uppercase letter designation
(R-407A, R-407B, R-407C) is used when refrigerant blends are;
13 - Flammable refrigerant cylinders must have a; -Correct Answer ✔-D - red band
on the top of the container.
14 - During the brazing process; -Correct Answer ✔-A - a low-pressure purge with
an inert gas, such as nitrogen, should be used.
15 - Which of the following refrigerant safety classifications is most hazardous in
terms of flammability and toxicity? -Correct Answer ✔-D - B3
16 - Which of the following refrigerants has the lowest global warming potential
(GWP)? -Correct Answer ✔-B - R-290
17 - Which of the following should be done prior to beginning the recovery
process? -Correct Answer ✔-C - Purge air from the refrigerant hoses to prevent
refrigerant contamination.
18 - When the manufacturer's literature is not available, the industry-accepted
evacuation level for most HVACR equipment is; -Correct Answer ✔-C - 500
Microns
19 - When working with A2L refrigerants, which one of the following is not an
approved leak detection method? -Correct Answer ✔-B - Halide Leak Detector
20 - When brazing a system that has been charged with an A2 refrigerant; -Correct
Answer ✔-D - system should be swept with nitrogen to ensure there is no residual
refrig.
Low GWP
