FDNY S15 CERTIFICATE OF FITNESS SUPERVISION OF FOAM-WATER SPRINKLER SYSTEMS EXAM PRACTICE QUESTIONS AND CORRECT ANSWERS 2026

FDNY S15 CERTIFICATE OF FITNESS
SUPERVISION OF FOAM-WATER
SPRINKLER SYSTEMS EXAM PRACTICE
QUESTIONS AND CORRECT ANSWERS
2026

FDNY S15 CERTIFICATE OF FITNESS
SUPERVISION OF FOAM-WATER
SPRINKLER SYSTEMS EXAM PRACTICE
QUESTIONS AND CORRECT ANSWERS
2026


1. What is the primary purpose of a foam-water sprinkler system?
A. To suppress Class A fires only
B. To control and extinguish flammable liquid (Class B) fires
C. To provide cooling only
D. To detect fires through heat sensors
Rationale: Foam-water systems are designed for Class B hazards involving
flammable liquids by forming a foam blanket that suppresses vapors and
cools surfaces._

,FDNY S15 CERTIFICATE OF FITNESS
SUPERVISION OF FOAM-WATER
SPRINKLER SYSTEMS EXAM PRACTICE
QUESTIONS AND CORRECT ANSWERS
2026
2. What foam type is most commonly used in foam-water sprinkler
systems protecting hydrocarbon fuels? A. AFFF (Aqueous Film
Forming Foam)

B. Protein foam
C. Alcohol-resistant foam
D. Fluoroprotein foam
Rationale: AFFF forms a thin film that rapidly spreads over hydrocarbon
fuel surfaces, providing quick vapor suppression._



3. Alcohol-resistant foams are specifically designed for what type of fuels?
A. Hydrocarbons
B. Polar solvents
C. Combustible solids
D. Organic peroxides
Rationale: Polar solvents dissolve regular foams, so alcohol-resistant foam
creates a polymer membrane to protect the foam layer._

,FDNY S15 CERTIFICATE OF FITNESS
SUPERVISION OF FOAM-WATER
SPRINKLER SYSTEMS EXAM PRACTICE
QUESTIONS AND CORRECT ANSWERS
2026
4. Which component mixes foam concentrate with water in the proper
proportion?
A. Foam nozzle
B. Foam proportioner
C. Foam generator
D. Concentrate pump
Rationale: The proportioner ensures the correct concentrate-to-water
ratio, essential for foam effectiveness._


5. What is the standard foam concentrate proportion for AFFF in most
systems? A. 1%
B. 3% or 6%
C. 10%
D. 15%
Rationale: AFFF concentrates are formulated for 3% or 6% mixtures,
depending on hazard type and manufacturer._

, FDNY S15 CERTIFICATE OF FITNESS
SUPERVISION OF FOAM-WATER
SPRINKLER SYSTEMS EXAM PRACTICE
QUESTIONS AND CORRECT ANSWERS
2026
6. Which NFPA standard governs foam-water sprinkler systems?
A. NFPA 13
B. NFPA 16
C. NFPA 25
D. NFPA 30
Rationale: NFPA 16 provides installation and maintenance standards for
foam-water sprinkler and spray systems._



7. Foam-water sprinkler systems are classified as what type of system
under NFPA 16?
A. Hybrid fire protection system
B. Dry chemical system
C. Standpipe system
D. Gaseous suppression system
Rationale: Foam-water systems combine properties of foam and water
systems, making them hybrid systems._