Systems Inspection, Testing, and Servicing

FDNY S18 Dry Chemical 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

• A dry chemical system is primarily designed to suppress which type of

fire?

• Class A
• Class B
• Class C
• Class D

Rationale: Dry chemical systems are optimized for flammable liquid (Class

• hazards.
• What is the main extinguishing agent in a BC dry chemical system? 1 / 4

• Water mist
• Sodium bicarbonate
• Potassium carbonate
• Ammonium phosphate

Rationale: BC systems commonly use sodium bicarbonate for B and C

hazards.

• Which document establishes maintenance requirements for dry

chemical systems?

A. OSHA 1910

B. NFPA 17

C. NFPA 25

D. NFPA 96

Rationale: NFPA 17 governs dry chemical extinguishing systems.

• What is the minimum required frequency for a full system inspection?
• Monthly
• Quarterly
• Semi-annually
• Annually

Rationale: NFPA 17 requires semiannual inspections.

• What device actuates the system automatically when heat is detected?
• Manual pull
• Annunciator 2 / 4

• Fusible link
• Alarm horn

Rationale: Fusible links melt at set temperatures, triggering actuation.

• What is the purpose of a pressure gauge on a dry chemical cylinder?
• Alarm testing
• Monitoring propellant pressure
• Flow verification
• Agent purity testing

Rationale: Gauges indicate adequate nitrogen pressure for discharge.

• Which test verifies unobstructed flow in the piping?
• Pressure test
• Valve test
• Piping blowout test
• Continuity test

Rationale: A blowout test ensures piping is free of blockages.

• What must be replaced during semiannual maintenance?
• System piping
• Nozzles
• Fusible links
• Cylinders

Rationale: Fusible links are required to be replaced every six months.

• What condition requires cylinder hydrostatic testing? 3 / 4

• Every year
• Every 3 years
• Every 12 years
• Never

Rationale: NFPA and DOT require 12-year hydrostatic testing for cylinders.

• What is used to pressurize a dry chemical cylinder?

A. CO₂

• Compressed air
• Nitrogen
• Argon

Rationale: Nitrogen is the standard inert pressurizing gas.

• In a dry chemical kitchen system, what must shut down upon system

discharge?

• Dishwasher
• Fuel supply
• Lighting
• Ventilation supply only

Rationale: Automatic fuel shutoff is mandatory for fire suppression.

12. The discharge piping shall be inspected to verify:

• Color coding
• Proper support and no corrosion
• Water flow
• / 4