SAE 609 CERTIFICATION EXAM BANK 250 Multiple
Choice Questions with ANSWER Key and Rationale
QUESTION 1:
The ozone layer is located in which layer of the atmosphere?
A) Troposphere
B) Stratosphere
C) Mesosphere
D) Thermosphere
ANSWER: B
Rationale: The ozone layer is located in the stratosphere, approximately 10-30 miles above
the Earth's surface. It contains high concentrations of ozone (O3) that absorb harmful UV
radiation.
QUESTION 2:
Which of the following refrigerants has the highest Ozone Depletion Potential (ODP)?
A) R-134a
B) R-1234yf
C) R-12
D) R-744
,ANSWER: C
Rationale: R-12 (dichlorodifluoromethane) is a CFC with an ODP of 1.0, the highest among
common MVAC refrigerants. R-134a has an ODP of 0, R-1234yf has an ODP of 0, and R-744
(CO2) has an ODP of 0.
QUESTION 3:
What is the primary reason CFCs were phased out under the Montreal Protocol?
A) They are toxic to humans
B) They contribute to ozone depletion
C) They are expensive to produce
D) They are flammable
ANSWER: B
Rationale: The Montreal Protocol (1987) was established to phase out CFCs and other
ozone-depleting substances because they release chlorine atoms in the stratosphere,
which catalytically destroy ozone molecules.
QUESTION 4:
A chlorine atom can destroy approximately how many ozone molecules?
A) 1
B) 10
C) 100
D) 100,000
ANSWER: D
Rationale: A single chlorine atom acts as a catalyst and can destroy up to 100,000 ozone
molecules before it is removed from the stratosphere. This catalytic effect makes CFCs
extremely damaging to the ozone layer.
,QUESTION 5:
Which SAE standard specifies the purity requirements for recycled R-134a refrigerant?
A) SAE J639
B) SAE J1991
C) SAE J2099
D) SAE J2788
ANSWER: C
Rationale: SAE J2099 establishes the maximum allowable levels of contaminants in
recycled R-134a, including moisture (50 ppm max), non-condensable gases (1.5% by
volume max), and oil content.
QUESTION 6:
What is the maximum allowable moisture content in recycled R-134a according to SAE
J2099?
A) 10 ppm
B) 25 ppm
C) 50 ppm
D) 100 ppm
ANSWER: C
Rationale: SAE J2099 specifies that recycled R-134a must contain no more than 50 parts
per million (ppm) of moisture to prevent system damage and ensure proper performance.
QUESTION 7:
The color code for an R-134a refrigerant cylinder is:
A) White
B) Light blue
, C) Green
D) Yellow
ANSWER: B
Rationale: Industry standard color coding helps prevent refrigerant mixing. R-134a
cylinders are light blue, R-12 is white, R-1234yf is white with a red band, and R-22 is green.
QUESTION 8:
The color code for an R-1234yf refrigerant cylinder is:
A) Light blue
B) White
C) White with a red band
D) Gray
ANSWER: C
Rationale: R-1234yf refrigerant cylinders are identified by a white top with a red band. This
distinctive coloring helps technicians avoid cross-contamination with other refrigerants.
QUESTION 9:
What is the Global Warming Potential (GWP) of R-134a?
A) 1
B) 4
C) 1430
D) 3920
ANSWER: C
Rationale: R-134a has a GWP of 1430, meaning it is 1,430 times more potent as a
greenhouse gas than CO2 over a 100-year period.
Choice Questions with ANSWER Key and Rationale
QUESTION 1:
The ozone layer is located in which layer of the atmosphere?
A) Troposphere
B) Stratosphere
C) Mesosphere
D) Thermosphere
ANSWER: B
Rationale: The ozone layer is located in the stratosphere, approximately 10-30 miles above
the Earth's surface. It contains high concentrations of ozone (O3) that absorb harmful UV
radiation.
QUESTION 2:
Which of the following refrigerants has the highest Ozone Depletion Potential (ODP)?
A) R-134a
B) R-1234yf
C) R-12
D) R-744
,ANSWER: C
Rationale: R-12 (dichlorodifluoromethane) is a CFC with an ODP of 1.0, the highest among
common MVAC refrigerants. R-134a has an ODP of 0, R-1234yf has an ODP of 0, and R-744
(CO2) has an ODP of 0.
QUESTION 3:
What is the primary reason CFCs were phased out under the Montreal Protocol?
A) They are toxic to humans
B) They contribute to ozone depletion
C) They are expensive to produce
D) They are flammable
ANSWER: B
Rationale: The Montreal Protocol (1987) was established to phase out CFCs and other
ozone-depleting substances because they release chlorine atoms in the stratosphere,
which catalytically destroy ozone molecules.
QUESTION 4:
A chlorine atom can destroy approximately how many ozone molecules?
A) 1
B) 10
C) 100
D) 100,000
ANSWER: D
Rationale: A single chlorine atom acts as a catalyst and can destroy up to 100,000 ozone
molecules before it is removed from the stratosphere. This catalytic effect makes CFCs
extremely damaging to the ozone layer.
,QUESTION 5:
Which SAE standard specifies the purity requirements for recycled R-134a refrigerant?
A) SAE J639
B) SAE J1991
C) SAE J2099
D) SAE J2788
ANSWER: C
Rationale: SAE J2099 establishes the maximum allowable levels of contaminants in
recycled R-134a, including moisture (50 ppm max), non-condensable gases (1.5% by
volume max), and oil content.
QUESTION 6:
What is the maximum allowable moisture content in recycled R-134a according to SAE
J2099?
A) 10 ppm
B) 25 ppm
C) 50 ppm
D) 100 ppm
ANSWER: C
Rationale: SAE J2099 specifies that recycled R-134a must contain no more than 50 parts
per million (ppm) of moisture to prevent system damage and ensure proper performance.
QUESTION 7:
The color code for an R-134a refrigerant cylinder is:
A) White
B) Light blue
, C) Green
D) Yellow
ANSWER: B
Rationale: Industry standard color coding helps prevent refrigerant mixing. R-134a
cylinders are light blue, R-12 is white, R-1234yf is white with a red band, and R-22 is green.
QUESTION 8:
The color code for an R-1234yf refrigerant cylinder is:
A) Light blue
B) White
C) White with a red band
D) Gray
ANSWER: C
Rationale: R-1234yf refrigerant cylinders are identified by a white top with a red band. This
distinctive coloring helps technicians avoid cross-contamination with other refrigerants.
QUESTION 9:
What is the Global Warming Potential (GWP) of R-134a?
A) 1
B) 4
C) 1430
D) 3920
ANSWER: C
Rationale: R-134a has a GWP of 1430, meaning it is 1,430 times more potent as a
greenhouse gas than CO2 over a 100-year period.
