Low GWP Refrigerant Practice Exam 2025–
2026 – HVAC Certification Preparation –
Practice Questions with Answers
Introduction:
This document contains a comprehensive set of multiple-choice and
true/false questions focused on low GWP refrigerants, safety
classifications, environmental impact, and regulatory requirements.
It covers key topics such as ODP, GWP, refrigerant types (CFCs,
HCFCs, HFCs, HFOs), flammability limits, and proper handling
procedures.
The material is structured as a practice exam with correct answers
provided, making it useful for exam preparation and revision. It
aligns with industry standards such as EPA Section 608 and safety
guidelines for A2L and flammable refrigerants.
Exam Questions and Verified Answers:
Which Type of refrigerants are most harmful to the ozone layer?
A) HFOs
B) UFOs
C) HCFCs
D) CFCs ---Correct precise answer---CFCs
,Which types of refrigerants are least harmful to the ozone layer?
(Select all that apply)
A) CFCs
B) HCFCs
C) HFCs
D) HFOs ---Correct precise answer---HFCs,HFOs
Which types of refrigerants have the lowest GWPs? (Select two)
A) CFCs
B) HFCs
C) HFOs
D) HCs ---Correct precise answer---HFOs, HCs
Ammonia is safe to use because it is a natural refrigerant. (True or
False) ---Correct precise answer---False
GWP is a measure of how much energy a gas traps in the
atmosphere over 100 years. (True or False) ---Correct precise
answer---False
,If a gas has a GWP, it means it has 50 times less global warming
potential than carbon dioxide. ( True or False) ---Correct precise
answer---False
R-410a is an A1 refrigerant. It is non-toxic and has low
flammability, making it one of the safest refrigerants to use. (True
or False) ---Correct precise answer---True
The GWPs of HFOs and HCs are close to those of HCFCs. (True or
False) ---Correct precise answer---False
The lowest number for an ozone depletion potential (ODP) is 1.
(True or False) ---Correct precise answer---False
The minimum concentration of a refrigerant that can propagate a
flame through a consistent mixture of the refrigerant and air is
known as the:
Acute toxicity exposure limit (ATELL).
Immediately dangerous to life or health concentration (IDLH).
Lower flmmability limit (LFL).
, Upper explosive limit (UEL). ---Correct precise answer---Lower
flmmability limit (LFL).
The first stage of the evacuation process which removes non-
condensables from a system is called:
degassing.
dehydration.
recovery.
Recycling. ---Correct precise answer---recovery
Once a flammable refrigerant has been recovered and stored in a
cylinder:
It can be taken a safe distance from the jobsite and vented to the
atmosphere.
It must be placed a safe distance away from the work area before a
system repair or installation is started.
2026 – HVAC Certification Preparation –
Practice Questions with Answers
Introduction:
This document contains a comprehensive set of multiple-choice and
true/false questions focused on low GWP refrigerants, safety
classifications, environmental impact, and regulatory requirements.
It covers key topics such as ODP, GWP, refrigerant types (CFCs,
HCFCs, HFCs, HFOs), flammability limits, and proper handling
procedures.
The material is structured as a practice exam with correct answers
provided, making it useful for exam preparation and revision. It
aligns with industry standards such as EPA Section 608 and safety
guidelines for A2L and flammable refrigerants.
Exam Questions and Verified Answers:
Which Type of refrigerants are most harmful to the ozone layer?
A) HFOs
B) UFOs
C) HCFCs
D) CFCs ---Correct precise answer---CFCs
,Which types of refrigerants are least harmful to the ozone layer?
(Select all that apply)
A) CFCs
B) HCFCs
C) HFCs
D) HFOs ---Correct precise answer---HFCs,HFOs
Which types of refrigerants have the lowest GWPs? (Select two)
A) CFCs
B) HFCs
C) HFOs
D) HCs ---Correct precise answer---HFOs, HCs
Ammonia is safe to use because it is a natural refrigerant. (True or
False) ---Correct precise answer---False
GWP is a measure of how much energy a gas traps in the
atmosphere over 100 years. (True or False) ---Correct precise
answer---False
,If a gas has a GWP, it means it has 50 times less global warming
potential than carbon dioxide. ( True or False) ---Correct precise
answer---False
R-410a is an A1 refrigerant. It is non-toxic and has low
flammability, making it one of the safest refrigerants to use. (True
or False) ---Correct precise answer---True
The GWPs of HFOs and HCs are close to those of HCFCs. (True or
False) ---Correct precise answer---False
The lowest number for an ozone depletion potential (ODP) is 1.
(True or False) ---Correct precise answer---False
The minimum concentration of a refrigerant that can propagate a
flame through a consistent mixture of the refrigerant and air is
known as the:
Acute toxicity exposure limit (ATELL).
Immediately dangerous to life or health concentration (IDLH).
Lower flmmability limit (LFL).
, Upper explosive limit (UEL). ---Correct precise answer---Lower
flmmability limit (LFL).
The first stage of the evacuation process which removes non-
condensables from a system is called:
degassing.
dehydration.
recovery.
Recycling. ---Correct precise answer---recovery
Once a flammable refrigerant has been recovered and stored in a
cylinder:
It can be taken a safe distance from the jobsite and vented to the
atmosphere.
It must be placed a safe distance away from the work area before a
system repair or installation is started.
