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Low GWP Refrigerant Exam 2026-2027 BANK QUESTIONS
WITH DETAILED VERIFIED ANSWERS EXAM QUESTIONS
WILL COME FROM HERE (100% CORRECT ANSWERS A+
GRADED
1. Which environmental metric measures a refrigerant's direct impact
on global warming over a 100-year time horizon relative to carbon
dioxide?
A. Ozone Depletion Potential (ODP)
B. Global Warming Potential (GWP)
C. Total Equivalent Warming Impact (TEWI)
D. Life Cycle Climate Performance (LCCP)
Answer: B
Explanation: Global Warming Potential (GWP) is an index specifically
designed to compare the radiative forcing of a mass of a greenhouse
gas to that of the same mass of carbon dioxide over a specific
timeframe, typically 100 years. ODP measures ozone layer degradation,
while TEWI and LCCP are broader metrics that include both direct and
indirect emissions.
2. According to the Kigali Amendment to the Montreal Protocol, the
phase-down of HFC refrigerants is primarily driven by their:
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A. High toxicity levels
B. High Ozone Depletion Potential
C. High Global Warming Potential
D. Low thermodynamic efficiency
Answer: C
Explanation: The Kigali Amendment specifically targets
hydrofluorocarbons (HFCs) for phase-down due to their high GWP.
While HFCs have zero ODP and are generally efficient, their potency as
greenhouse gases necessitates international regulation to mitigate
climate change.
3. Which of the following refrigerants is classified as a
Hydrofluoroolefin (HFO)?
A. R-134a
B. R-1234yf
C. R-410A
D. R-22
Answer: B
Explanation: R-1234yf (2,3,3,3-Tetrafluoropropene) is an unsaturated
organic compound belonging to the HFO family, distinguished by a
carbon-carbon double bond in its molecular structure. This bond
reduces atmospheric lifetime and GWP dramatically compared to
saturated HFCs like R-134a.
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4. The ASHRAE Standard 34 safety classification "A2L" indicates a
refrigerant that is:
A. Non-toxic and non-flammable
B. Toxic and flammable
C. Non-toxic and lower flammability
D. Non-toxic and highly flammable
Answer: C
Explanation: In ASHRAE Standard 34, the letter 'A' designates lower
toxicity, while 'B' designates higher toxicity. The numeral '2L' denotes a
refrigerant with lower flammability and a maximum burning velocity of
≤ 10 cm/s, distinguishing it from more flammable '2' or '3'
classifications.
5. What is the primary driver of the transition from high-GWP HFCs to
low-GWP alternatives in the HVAC&R industry?
A. Decreasing equipment costs
B. Improving thermodynamic cycle efficiency
C. Global environmental regulations
D. Increasing availability of CFCs
Answer: C
Explanation: While cost and efficiency are considerations, the primary
driver is a regulatory framework including the Kigali Amendment, EU F-
Gas Regulation, and national SNAP rules. These mandate a phasedown
of HFC production and consumption to meet international climate
targets, forcing the market to adopt alternatives.
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6. Which low-GWP refrigerant is an azeotropic blend designed as a near
drop-in replacement for R-410A in air conditioning?
A. R-32
B. R-454B
C. R-290
D. R-1234yf
Answer: B
Explanation: R-454B is a low-GWP (GWP ~466) azeotropic blend of R-32
and R-1234yf. It is specifically formulated to match the capacity and
efficiency of R-410A with minimal system redesign, making it a leading
candidate for unitary residential and light commercial air conditioning.
7. The primary safety concern when transitioning from R-410A to a
mildly flammable A2L refrigerant like R-32 is:
A. Increased system operating pressure
B. Potential for refrigerant combustion given the right conditions
C. Chemical incompatibility with copper piping
D. Reduction in system cooling capacity
Answer: B
Explanation: R-32's A2L classification signifies it is mildly flammable.
While it has a high lower flammability limit and low burning velocity,
safety standards require mitigations like leak detection sensors,
internal air circulation, and charge limit calculations to prevent reaching
a flammable concentration in confined spaces.
Low GWP Refrigerant Exam 2026-2027 BANK QUESTIONS
WITH DETAILED VERIFIED ANSWERS EXAM QUESTIONS
WILL COME FROM HERE (100% CORRECT ANSWERS A+
GRADED
1. Which environmental metric measures a refrigerant's direct impact
on global warming over a 100-year time horizon relative to carbon
dioxide?
A. Ozone Depletion Potential (ODP)
B. Global Warming Potential (GWP)
C. Total Equivalent Warming Impact (TEWI)
D. Life Cycle Climate Performance (LCCP)
Answer: B
Explanation: Global Warming Potential (GWP) is an index specifically
designed to compare the radiative forcing of a mass of a greenhouse
gas to that of the same mass of carbon dioxide over a specific
timeframe, typically 100 years. ODP measures ozone layer degradation,
while TEWI and LCCP are broader metrics that include both direct and
indirect emissions.
2. According to the Kigali Amendment to the Montreal Protocol, the
phase-down of HFC refrigerants is primarily driven by their:
,2|Page
A. High toxicity levels
B. High Ozone Depletion Potential
C. High Global Warming Potential
D. Low thermodynamic efficiency
Answer: C
Explanation: The Kigali Amendment specifically targets
hydrofluorocarbons (HFCs) for phase-down due to their high GWP.
While HFCs have zero ODP and are generally efficient, their potency as
greenhouse gases necessitates international regulation to mitigate
climate change.
3. Which of the following refrigerants is classified as a
Hydrofluoroolefin (HFO)?
A. R-134a
B. R-1234yf
C. R-410A
D. R-22
Answer: B
Explanation: R-1234yf (2,3,3,3-Tetrafluoropropene) is an unsaturated
organic compound belonging to the HFO family, distinguished by a
carbon-carbon double bond in its molecular structure. This bond
reduces atmospheric lifetime and GWP dramatically compared to
saturated HFCs like R-134a.
,3|Page
4. The ASHRAE Standard 34 safety classification "A2L" indicates a
refrigerant that is:
A. Non-toxic and non-flammable
B. Toxic and flammable
C. Non-toxic and lower flammability
D. Non-toxic and highly flammable
Answer: C
Explanation: In ASHRAE Standard 34, the letter 'A' designates lower
toxicity, while 'B' designates higher toxicity. The numeral '2L' denotes a
refrigerant with lower flammability and a maximum burning velocity of
≤ 10 cm/s, distinguishing it from more flammable '2' or '3'
classifications.
5. What is the primary driver of the transition from high-GWP HFCs to
low-GWP alternatives in the HVAC&R industry?
A. Decreasing equipment costs
B. Improving thermodynamic cycle efficiency
C. Global environmental regulations
D. Increasing availability of CFCs
Answer: C
Explanation: While cost and efficiency are considerations, the primary
driver is a regulatory framework including the Kigali Amendment, EU F-
Gas Regulation, and national SNAP rules. These mandate a phasedown
of HFC production and consumption to meet international climate
targets, forcing the market to adopt alternatives.
, 4|Page
6. Which low-GWP refrigerant is an azeotropic blend designed as a near
drop-in replacement for R-410A in air conditioning?
A. R-32
B. R-454B
C. R-290
D. R-1234yf
Answer: B
Explanation: R-454B is a low-GWP (GWP ~466) azeotropic blend of R-32
and R-1234yf. It is specifically formulated to match the capacity and
efficiency of R-410A with minimal system redesign, making it a leading
candidate for unitary residential and light commercial air conditioning.
7. The primary safety concern when transitioning from R-410A to a
mildly flammable A2L refrigerant like R-32 is:
A. Increased system operating pressure
B. Potential for refrigerant combustion given the right conditions
C. Chemical incompatibility with copper piping
D. Reduction in system cooling capacity
Answer: B
Explanation: R-32's A2L classification signifies it is mildly flammable.
While it has a high lower flammability limit and low burning velocity,
safety standards require mitigations like leak detection sensors,
internal air circulation, and charge limit calculations to prevent reaching
a flammable concentration in confined spaces.
