Plant Practice Exam Questions And

FDNY C-02 Fire Truck Operator At LNG Plant Practice Exam Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf

• What is the primary hazard associated with LNG at an industrial facility?
• Corrosivity
• High flash point
• Cryogenic temperature and vapor cloud formation
• Radioactivity

Answer: C

Rationale: LNG is extremely cold and creates dense vapor clouds that can

ignite when mixed with air.

• LNG is predominantly composed of which hydrocarbon? 1 / 4

• Ethane
• Methane
• Propane
• Butane

Answer: B

Rationale: LNG is primarily methane (≈ 90–99%), giving it specific

flammable and cryogenic characteristics.

• At what approximate temperature is LNG stored?

A. –50°F

B. –120°F

C. –260°F

D. –320°F

Answer: C

Rationale: LNG is maintained near –260°F to remain in liquid form.

• Which condition is required for methane ignition?
• 1–50% concentration in air
• 10–20% concentration in air
• 5–15% concentration in air
• Any concentration is ignitable

Answer: C

Rationale: Methane’s flammable range is 5–15%. 2 / 4

• The first operational priority of a C-02 Operator responding to an LNG

leak is:

• Extinguish all flames immediately
• Establish safe isolation and control ignition sources
• Enter the vapor cloud
• Shut down the plant

Answer: B

Rationale: Preventing ignition is critical in LNG vapor cloud events.

• Which extinguisher is suitable for LNG fires?
• Water only
• Dry chemical
• Class K only
• Class A only

Answer: B

Rationale: Dry chemical agents effectively disrupt hydrocarbon flame

chemistry.

• What is the minimum safe approach distance to an LNG pool fire unless

performing rescue?

• 10 ft
• 25 ft
• 100 ft
• 300 ft 3 / 4

Answer: C

Rationale: Heat radiation and flash potential require ≥100 ft unless life

rescue is necessary.

• Why must water fog be used carefully on LNG spills?
• It solidifies instantly
• It increases vaporization rate
• It can spread the LNG pool
• It has no cooling effect

Answer: C

Rationale: Water can cause rapid boil-off, spreading cryogenic liquid

outward.

9. The primary purpose of fixed monitors on an LNG fire truck is:

• Ventilate gas clouds
• Apply large-volume water or foam streams remotely
• Measure cryogenic temperatures
• Test hydrant flow

Answer: B

Rationale: Remote attack is necessary for high-heat LNG scenarios.

• Which PPE component is critical when approaching cryogenic spills?
• Leather gloves
• Cotton overalls
• Cryogenic-rated protective gloves and face shield
• / 4