Inspection, Testing and Servicing Technician

FDNY S16 Gaseous Fire Extinguishing Systems Inspection, Testing and Servicing Technician (Citywide) Practice Exam Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf

1. The primary purpose of a gaseous extinguishing system is to:

• Remove heat only
• Reduce oxygen or inhibit combustion chemistry
• Cool fuel surfaces
• Produce steam

Answer: B

Rationale: Gaseous agents suppress fires mainly by lowering oxygen or

interrupting the chemical chain reaction.

2. CO₂ systems extinguish fire primarily by:

• Smothering with foam
• Cooling the fuel 1 / 4

• Displacing oxygen
• Absorbing free radicals

Answer: C

Rationale: CO₂ reduces oxygen concentration below combustion limits.

3. In a clean agent system, “clean” means:

• Leaves no residue
• Is non-toxic
• Requires no cylinders
• Does not require detection

Answer: A

Rationale: Clean agents do not leave residue after discharge.

4. The minimum personnel safety concern during CO₂ discharge is:

• Burns
• Frostbite
• Oxygen deficiency
• High humidity

Answer: C

Rationale: CO₂ reduces oxygen to life-hazard levels during discharge.

5. System hydrostatic testing is required:

• Daily
• Monthly
• At intervals specified by NFPA/FDNY 2 / 4

• Only after discharge

Answer: C

Rationale: Hydrostatic testing follows scheduled intervals mandated by

code.

6. A system “manual release” must be:

• Hidden
• Adjacent to the fire source
• Clearly identified and accessible
• Behind panels

Answer: C

Rationale: Manual releases must be visible and readily accessible in

emergencies.

7. Gaseous systems must automatically shut down HVAC to:

• Improve comfort
• Protect equipment
• Prevent agent loss
• Reduce maintenance

Answer: C

Rationale: Stopping ventilation keeps the agent concentration effective.

8. The primary hazard with Halon systems is:

• Explosion
• Toxic decomposition products 3 / 4

• Electrical shock
• Overpressure from plumbing

Answer: B

Rationale: Halon exposed to flame can produce toxic byproducts.

9. A technician must verify that cylinders are:

• Painted
• Installed outside
• Properly supported and secured
• Touching each other

Answer: C

Rationale: Cylinders must be secured to prevent movement or damage.

10. Leakage in piping is best detected during:

• Visual inspection
• Hydrostatic testing
• Flow testing
• Knocking on pipe

Answer: B

Rationale: Hydrostatic tests reveal integrity and leakage.

11. Pressure switches confirm:

• Temperature
• Smoke
• Flow or pressure changes
• / 4