Fire Extinguishing Systems Inspection, Testing,

FDNY S17 Commercial Cooking Wet 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

• Which NFPA standard governs wet chemical extinguishing systems for

commercial cooking?

A. NFPA 10

B. NFPA 17

C. NFPA 17A

D. NFPA 96

Answer: C

Rationale: NFPA 17A specifically covers wet chemical extinguishing

systems.

• The primary extinguishing agent in most commercial cooking wet

chemical systems is: 1 / 4

• Halon 1211
• Water mist

C. CO₂

• Potassium-based solution

Answer: D

Rationale: Wet chemical systems rely on potassium salts for saponification

of hot grease.

• What process converts hot grease to a soapy layer during

extinguishment?

• Oxidation
• Combustion
• Emulsification
• Saponification

Answer: D

Rationale: Potassium-based agents react with fats to create a non-

flammable soapy foam layer.

• How often must commercial cooking exhaust systems be inspected?
• Monthly
• Every 6 months
• Annually
• Every 2 years

Answer: B

Rationale: FDNY and NFPA 96 require semiannual inspections. 2 / 4

5. Fusible links in a wet chemical system must be replaced:

• Only when damaged
• Every 5 years
• Every 6 months
• Every 3 months

Answer: C

Rationale: Fusible links are replaced at each semiannual inspection.

6. The manual pull station for the system must be located:

• Next to the fryer
• Inside the hood
• Above the cookline
• 10–20 ft from cooking appliances

Answer: D

Rationale: Manual pulls must be accessible yet away from immediate fire

danger.

7. Upon system activation, gas and electric power to appliances must:

• Stay on
• Reset automatically
• Shut off
• Switch to low power

Answer: C

Rationale: Fuel shutoff is required to stop heat production. 3 / 4

8. The test method for verifying nozzle alignment is:

• Ultrasonic testing
• Visual inspection
• Pressure test
• Thermal imaging

Answer: B

Rationale: Technicians must visually verify proper nozzle orientation.

9. System cylinders must be hydrostatically tested every:

• 2 years
• 3 years
• 12 years
• 15 years

Answer: C

Rationale: NFPA requires a 12-year hydro test for wet chemical cylinders.

10. The K-class portable extinguisher must be located within:

• 100 ft
• 50 ft
• 20 ft
• 30 ft

Answer: D

Rationale: NFPA 10 requires K-class units within 30 ft of cooking

equipment.

• / 4