FDNY G 98 EXAM STUDY GUIDE 2026
2027 200 PRACTICE QUESTIONS
WITH RATIONALES HANDLING USE
AND STORAGE OF FLAMMABLE
COMPRESSED GASES
### FDNY G-98 Practice Exam:
What is the minimum distance that flammable gas cylinders must be
kept away from open flames or other sources of ignition?
• A. 10 feet
• B. 15 feet
• C. 25 feet
• D. 50 feet
• Rationale: The NYC Fire Code generally requires a 25-foot
clearance between flammable gas storage and ignition
sources like open flames or sparking equipment.
2. Which of the following is an example of a "Flammable Compressed
Gas"?
• A. Oxygen
• B. Acetylene
• C. Nitrogen
• D. Carbon Dioxide
• Rationale: Acetylene, Hydrogen, and Propane are
flammable. Oxygen is an oxidizer, while Nitrogen and CO2
are inert gases.
3. At what pressure is Acetylene considered extremely unstable and
dangerous if it is not dissolved in a solvent (like acetone)?
• A. 5 psi
• B. 15 psi
, • C. 50 psi
• D. 100 psi
• Rationale: Free acetylene can decompose explosively at
pressures above 15 psi; therefore, regulators must never be
set higher than this for acetylene gas.
4. How should compressed gas cylinders be stored to prevent falling?
• A. Stacked horizontally
• B. Upright and secured with a chain or strap
• C. Leaning against a wall at a 45-degree angle
• D. Only on wooden pallets
• Rationale: All cylinders must be stored in the upright
position and securely fastened to a fixed structure or cart to
prevent physical damage or valve shearing.
5. What is the required fire rating for the walls of a dedicated indoor
gas storage room?
• A. 30 minutes
• B. 1 hour
• C. 2 hours
• D. 4 hours
• Rationale: FDNY regulations typically require indoor
storage areas for hazardous materials to be separated by 2-
hour fire-rated construction.
6. What color is a standard Acetylene cylinder hose in most torch
setups?
• A. Green
• B. Red
• C. Yellow
• D. Blue
• Rationale: In industry standards, red hoses are used for fuel
gases (like acetylene), and green hoses are used for oxygen.
,7. If a leak is suspected in a cylinder valve, how should the
rigger/operator check for it?
• A. Use a lit match
• B. Listen for a "hiss" only
• C. Use a pH-neutral soapy water solution
• D. Smell the air around the valve
• Rationale: Never use a flame to find a leak. A soap and
water solution will bubble at the source of the leak safely.
8. When cylinders are not in use, which component must be in place
to protect the valve?
• A. A regulator
• B. A pressure gauge
• C. A valve protection cap
• D. Duct tape
• Rationale: Protective caps prevent the valve from breaking
if the cylinder is accidentally knocked over.
9. Oxidizing gases (like Oxygen) must be separated from flammable
gas cylinders by a minimum distance of:
• A. 5 feet
• B. 10 feet
• C. 20 feet
• D. 40 feet
• Rationale: The Fire Code requires a 20-foot separation or a
non-combustible 5-foot high wall with a 30-minute fire
rating to separate oxidizers from fuel gases.
10. Who is allowed to handle and use flammable compressed
gases in a commercial setting in NYC?
• A. Anyone with a high school diploma
• B. Only the business owner
, • C. A person holding a valid FDNY Certificate of
Fitness
• D. Any licensed plumber
• Rationale: A Certificate of Fitness (like the G-98) is required
by law to supervise the storage and use of these hazardous
materials.
11. Which document provides detailed safety information, chemical
properties, and emergency procedures for a specific gas?
• A. The Daily Work Log
• B. The Invoice
• C. Safety Data Sheet (SDS)
• D. The Building Permit
• Rationale: The SDS contains all critical safety information
and must be accessible to employees at all times.
12.In the event of a fire involving a flammable gas cylinder that
cannot be easily extinguished, the first action should be:
• A. Try to move the cylinder outside
• B. Evacuate the area and call emergency services
• C. Throw water on the flame
• D. Turn off the building's electricity
• Rationale: Life safety is the priority; never risk injury to
move a burning gas cylinder.
13.What is the maximum amount of flammable gas allowed to be
stored in a building without a permit (generally)?
• A. 100 cubic feet
• B. 3,000 cubic feet
• C. 5,000 cubic feet
• D. 10,000 cubic feet
• Rationale: While amounts vary by occupancy, a storage
permit is typically required when quantities exceed 3,000
SCF of flammable gas.
2027 200 PRACTICE QUESTIONS
WITH RATIONALES HANDLING USE
AND STORAGE OF FLAMMABLE
COMPRESSED GASES
### FDNY G-98 Practice Exam:
What is the minimum distance that flammable gas cylinders must be
kept away from open flames or other sources of ignition?
• A. 10 feet
• B. 15 feet
• C. 25 feet
• D. 50 feet
• Rationale: The NYC Fire Code generally requires a 25-foot
clearance between flammable gas storage and ignition
sources like open flames or sparking equipment.
2. Which of the following is an example of a "Flammable Compressed
Gas"?
• A. Oxygen
• B. Acetylene
• C. Nitrogen
• D. Carbon Dioxide
• Rationale: Acetylene, Hydrogen, and Propane are
flammable. Oxygen is an oxidizer, while Nitrogen and CO2
are inert gases.
3. At what pressure is Acetylene considered extremely unstable and
dangerous if it is not dissolved in a solvent (like acetone)?
• A. 5 psi
• B. 15 psi
, • C. 50 psi
• D. 100 psi
• Rationale: Free acetylene can decompose explosively at
pressures above 15 psi; therefore, regulators must never be
set higher than this for acetylene gas.
4. How should compressed gas cylinders be stored to prevent falling?
• A. Stacked horizontally
• B. Upright and secured with a chain or strap
• C. Leaning against a wall at a 45-degree angle
• D. Only on wooden pallets
• Rationale: All cylinders must be stored in the upright
position and securely fastened to a fixed structure or cart to
prevent physical damage or valve shearing.
5. What is the required fire rating for the walls of a dedicated indoor
gas storage room?
• A. 30 minutes
• B. 1 hour
• C. 2 hours
• D. 4 hours
• Rationale: FDNY regulations typically require indoor
storage areas for hazardous materials to be separated by 2-
hour fire-rated construction.
6. What color is a standard Acetylene cylinder hose in most torch
setups?
• A. Green
• B. Red
• C. Yellow
• D. Blue
• Rationale: In industry standards, red hoses are used for fuel
gases (like acetylene), and green hoses are used for oxygen.
,7. If a leak is suspected in a cylinder valve, how should the
rigger/operator check for it?
• A. Use a lit match
• B. Listen for a "hiss" only
• C. Use a pH-neutral soapy water solution
• D. Smell the air around the valve
• Rationale: Never use a flame to find a leak. A soap and
water solution will bubble at the source of the leak safely.
8. When cylinders are not in use, which component must be in place
to protect the valve?
• A. A regulator
• B. A pressure gauge
• C. A valve protection cap
• D. Duct tape
• Rationale: Protective caps prevent the valve from breaking
if the cylinder is accidentally knocked over.
9. Oxidizing gases (like Oxygen) must be separated from flammable
gas cylinders by a minimum distance of:
• A. 5 feet
• B. 10 feet
• C. 20 feet
• D. 40 feet
• Rationale: The Fire Code requires a 20-foot separation or a
non-combustible 5-foot high wall with a 30-minute fire
rating to separate oxidizers from fuel gases.
10. Who is allowed to handle and use flammable compressed
gases in a commercial setting in NYC?
• A. Anyone with a high school diploma
• B. Only the business owner
, • C. A person holding a valid FDNY Certificate of
Fitness
• D. Any licensed plumber
• Rationale: A Certificate of Fitness (like the G-98) is required
by law to supervise the storage and use of these hazardous
materials.
11. Which document provides detailed safety information, chemical
properties, and emergency procedures for a specific gas?
• A. The Daily Work Log
• B. The Invoice
• C. Safety Data Sheet (SDS)
• D. The Building Permit
• Rationale: The SDS contains all critical safety information
and must be accessible to employees at all times.
12.In the event of a fire involving a flammable gas cylinder that
cannot be easily extinguished, the first action should be:
• A. Try to move the cylinder outside
• B. Evacuate the area and call emergency services
• C. Throw water on the flame
• D. Turn off the building's electricity
• Rationale: Life safety is the priority; never risk injury to
move a burning gas cylinder.
13.What is the maximum amount of flammable gas allowed to be
stored in a building without a permit (generally)?
• A. 100 cubic feet
• B. 3,000 cubic feet
• C. 5,000 cubic feet
• D. 10,000 cubic feet
• Rationale: While amounts vary by occupancy, a storage
permit is typically required when quantities exceed 3,000
SCF of flammable gas.
