FDNY G98 Handling, Use and Storage of Flammable
Compressed Gases Practice 2026 Exam Questions with
Verified Answers and Rationales GUARANTEED
PASS
QUESTION 1
What is the primary hazard associated with flammable compressed gases?
A. Corrosion
B. Fire and explosion
C. Electrocution
D. Radiation
VERIFIED ANSWER: B
Rationale: Flammable compressed gases pose a significant risk of fire or
explosion if released in an uncontrolled manner and exposed to heat, sparks, or
open flames.
QUESTION 2
Which of the following gases is classified as a flammable compressed gas?
A. Nitrogen
B. Propane
C. Argon
D. Carbon dioxide
VERIFIED ANSWER: B
Rationale: Propane is a hydrocarbon gas that can ignite easily when exposed to an
ignition source. Nitrogen, argon, and carbon dioxide are non-flammable.
QUESTION 3
Under NFPA standards, how should flammable gases be stored?
,A. With oxidizers
B. In well-ventilated areas away from ignition sources
C. In underground tanks only
D. Next to heat sources
VERIFIED ANSWER: B
Rationale: Proper storage prevents gas accumulation and reduces the likelihood of
ignition. Well-ventilated areas allow any leaked gas to disperse safely.
QUESTION 4
What is the minimum distance flammable gas cylinders must be kept from sources
of ignition?
A. 5 feet
B. 10 feet
C. 20 feet
D. 50 feet
VERIFIED ANSWER: C
Rationale: NFPA guidelines and safety standards require flammable gas cylinders
to be stored at least 20 feet from potential ignition sources such as open flames,
welding equipment, or electrical sparks.
QUESTION 5
Which color is typically used to identify flammable gas cylinders?
A. Blue
B. Green
C. Red
D. Yellow
VERIFIED ANSWER: C
Rationale: Red is commonly used to indicate flammable gases for quick visual
recognition by workers and emergency responders. Color coding helps identify the
type of gas, alerting workers to potential hazards.
,QUESTION 6
How should flammable gas cylinders be stored to prevent them from falling over?
A. Lying on their side
B. Stacked horizontally
C. Upright and secured with a chain or strap
D. On a soft surface
VERIFIED ANSWER: C
Rationale: Securing cylinders upright prevents tipping, which could damage the
valve and cause a leak. Cylinders should always be chained or strapped to a fixed
structure when not in use.
QUESTION 7
What should you do if a flammable gas cylinder is leaking?
A. Try to seal it with tape
B. Move it to a closed room
C. Evacuate the area, eliminate ignition sources, and notify the fire
department
D. Ignore it if minor
VERIFIED ANSWER: C
Rationale: Leaks of flammable gases are extremely hazardous as they can quickly
create a fire or explosion hazard. Evacuation and professional emergency response
are required.
QUESTION 8
What is the purpose of a regulator on a flammable gas cylinder?
A. Heat the gas for use
B. Reduce and control the gas pressure
C. Convert gas to liquid
D. Increase cylinder pressure
, VERIFIED ANSWER: B
Rationale: Regulators control the high pressure from the cylinder (inlet pressure)
down to a safe, usable level for equipment (outlet pressure).
QUESTION 9
Which type of fire extinguisher is suitable for flammable gas fires?
A. Water
B. Foam
C. Dry chemical or CO₂
D. Wet cloth
VERIFIED ANSWER: C
Rationale: Dry chemical or CO₂ extinguishers are effective on Class B (flammable
liquids and gases) fires. Water can spread a gas fire and is not appropriate.
QUESTION 10
What does the NFPA 704 diamond label indicate for a flammable gas?
A. Health hazard only
B. Instability rating
C. Flammability rating of 4
D. Special hazard OX
VERIFIED ANSWER: C
Rationale: NFPA 704 uses a red quadrant for flammability. Flammable gases
typically receive a rating of 4 (most severe) due to their ability to ignite easily.
QUESTION 11
When transporting flammable gas cylinders in a vehicle, they should be:
A. Placed in the passenger seat
B. Secured upright and valves closed
Compressed Gases Practice 2026 Exam Questions with
Verified Answers and Rationales GUARANTEED
PASS
QUESTION 1
What is the primary hazard associated with flammable compressed gases?
A. Corrosion
B. Fire and explosion
C. Electrocution
D. Radiation
VERIFIED ANSWER: B
Rationale: Flammable compressed gases pose a significant risk of fire or
explosion if released in an uncontrolled manner and exposed to heat, sparks, or
open flames.
QUESTION 2
Which of the following gases is classified as a flammable compressed gas?
A. Nitrogen
B. Propane
C. Argon
D. Carbon dioxide
VERIFIED ANSWER: B
Rationale: Propane is a hydrocarbon gas that can ignite easily when exposed to an
ignition source. Nitrogen, argon, and carbon dioxide are non-flammable.
QUESTION 3
Under NFPA standards, how should flammable gases be stored?
,A. With oxidizers
B. In well-ventilated areas away from ignition sources
C. In underground tanks only
D. Next to heat sources
VERIFIED ANSWER: B
Rationale: Proper storage prevents gas accumulation and reduces the likelihood of
ignition. Well-ventilated areas allow any leaked gas to disperse safely.
QUESTION 4
What is the minimum distance flammable gas cylinders must be kept from sources
of ignition?
A. 5 feet
B. 10 feet
C. 20 feet
D. 50 feet
VERIFIED ANSWER: C
Rationale: NFPA guidelines and safety standards require flammable gas cylinders
to be stored at least 20 feet from potential ignition sources such as open flames,
welding equipment, or electrical sparks.
QUESTION 5
Which color is typically used to identify flammable gas cylinders?
A. Blue
B. Green
C. Red
D. Yellow
VERIFIED ANSWER: C
Rationale: Red is commonly used to indicate flammable gases for quick visual
recognition by workers and emergency responders. Color coding helps identify the
type of gas, alerting workers to potential hazards.
,QUESTION 6
How should flammable gas cylinders be stored to prevent them from falling over?
A. Lying on their side
B. Stacked horizontally
C. Upright and secured with a chain or strap
D. On a soft surface
VERIFIED ANSWER: C
Rationale: Securing cylinders upright prevents tipping, which could damage the
valve and cause a leak. Cylinders should always be chained or strapped to a fixed
structure when not in use.
QUESTION 7
What should you do if a flammable gas cylinder is leaking?
A. Try to seal it with tape
B. Move it to a closed room
C. Evacuate the area, eliminate ignition sources, and notify the fire
department
D. Ignore it if minor
VERIFIED ANSWER: C
Rationale: Leaks of flammable gases are extremely hazardous as they can quickly
create a fire or explosion hazard. Evacuation and professional emergency response
are required.
QUESTION 8
What is the purpose of a regulator on a flammable gas cylinder?
A. Heat the gas for use
B. Reduce and control the gas pressure
C. Convert gas to liquid
D. Increase cylinder pressure
, VERIFIED ANSWER: B
Rationale: Regulators control the high pressure from the cylinder (inlet pressure)
down to a safe, usable level for equipment (outlet pressure).
QUESTION 9
Which type of fire extinguisher is suitable for flammable gas fires?
A. Water
B. Foam
C. Dry chemical or CO₂
D. Wet cloth
VERIFIED ANSWER: C
Rationale: Dry chemical or CO₂ extinguishers are effective on Class B (flammable
liquids and gases) fires. Water can spread a gas fire and is not appropriate.
QUESTION 10
What does the NFPA 704 diamond label indicate for a flammable gas?
A. Health hazard only
B. Instability rating
C. Flammability rating of 4
D. Special hazard OX
VERIFIED ANSWER: C
Rationale: NFPA 704 uses a red quadrant for flammability. Flammable gases
typically receive a rating of 4 (most severe) due to their ability to ignite easily.
QUESTION 11
When transporting flammable gas cylinders in a vehicle, they should be:
A. Placed in the passenger seat
B. Secured upright and valves closed
