1
Low GWP Refrigerant Practice Exam
Questions And Correct Answers
Which of the following refrigerants has the lowest global warming potential
(GWP)?
R-32
R-290
R-404A
R-454B - correct-answer -R-290
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.
,2
Vent the contents of the recovery tank to ensure it is empty. - correct-answer -
Purge air from the refrigerant hoses to prevent refrigerant contamination.
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. - correct-answer -Halide leak detector.
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 stablize the inner walls.
The system charge must be vented to the atmosphere before beginning.
, 3
The system should be swept with nitrogen to ensure that there is no residual
refrigerant. - correct-answer -The system should be swept with nitrogen to ensure
that there is no residual refrigerant.
Refrigerants that have a lowercase designation, such as R-134a, indicates a(n):
Azeotrope blend.
Isomer.
Olefin.
Zeotropic blend. - correct-answer -Isomer.
Which of the following is classified as an A2L refrigerant?
R-290
R-441A
R-744
Low GWP Refrigerant Practice Exam
Questions And Correct Answers
Which of the following refrigerants has the lowest global warming potential
(GWP)?
R-32
R-290
R-404A
R-454B - correct-answer -R-290
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.
,2
Vent the contents of the recovery tank to ensure it is empty. - correct-answer -
Purge air from the refrigerant hoses to prevent refrigerant contamination.
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. - correct-answer -Halide leak detector.
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 stablize the inner walls.
The system charge must be vented to the atmosphere before beginning.
, 3
The system should be swept with nitrogen to ensure that there is no residual
refrigerant. - correct-answer -The system should be swept with nitrogen to ensure
that there is no residual refrigerant.
Refrigerants that have a lowercase designation, such as R-134a, indicates a(n):
Azeotrope blend.
Isomer.
Olefin.
Zeotropic blend. - correct-answer -Isomer.
Which of the following is classified as an A2L refrigerant?
R-290
R-441A
R-744
