FDNY S15 – Supervision of Foam-Water
Sprinkler Systems (Citywide) Practice
Exam Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. What is the primary purpose of a foam-water sprinkler system?
A. Provide cooling only
B. Provide water mist suppression
C. Control flammable-liquid fires using foam solution
D. Remove oxygen from all types of fires
Rationale: Foam-water systems are designed for Class B fire hazards where
foam blankets and suppresses flammable-liquid vapors.
2. Foam concentrate is typically mixed with water to form:
,A. Aqueous suppressant powder
B. Foam solution
C. Dry chemical agent
D. Halocarbon mixture
Rationale: The first mixture created is the foam solution before aeration
forms finished foam.
3. Which pipe color coding commonly indicates foam concentrate lines?
A. Blue
B. Green
C. Yellow
D. Orange
Rationale: Industry practice uses yellow for foam concentrate to
differentiate from normal water piping.
4. Which NFPA standard applies to foam-water sprinkler systems?
A. NFPA 10
B. NFPA 12
C. NFPA 16
D. NFPA 24
Rationale: NFPA 16 governs the installation of foam-water sprinkler and
foam-water spray systems.
,5. A proportioner’s function is to:
A. Agitate finished foam
B. Introduce foam concentrate into the water stream at a set ratio
C. Remove air from piping
D. Provide secondary power
Rationale: The proportioner meters concentrate into the water to create
foam solution.
6. Which hazard class most commonly requires foam-water systems?
A. Class A solids
B. Class B flammable liquids
C. Class C energized equipment
D. Class K cooking oils
Rationale: Foam suppresses vapor release from flammable-liquid fuels.
7. A bladder tank uses:
A. Compressed air to inject concentrate
B. Water pressure to force concentrate from a bladder
C. Manual pumping
D. Mechanical refrigeration
, Rationale: System water pressure squeezes the internal bladder to
discharge concentrate.
8. Which of the following is a fixed foam-water discharge device?
A. Fog nozzle
B. Foam-water sprinkler head
C. Portable aerator
D. Handline eductor
Rationale: Foam-water sprinklers are permanently installed discharge
devices.
9. The minimum supervisor requirement for S-15 is:
A. On-site technical engineer
B. Master electrician
C. Fire and life safety certificate holder
D. Licensed plumber
Rationale: FDNY requires a certificate holder to supervise foam-water
systems.
10. An S-15 certificate holder must inspect the system:
Sprinkler Systems (Citywide) Practice
Exam Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. What is the primary purpose of a foam-water sprinkler system?
A. Provide cooling only
B. Provide water mist suppression
C. Control flammable-liquid fires using foam solution
D. Remove oxygen from all types of fires
Rationale: Foam-water systems are designed for Class B fire hazards where
foam blankets and suppresses flammable-liquid vapors.
2. Foam concentrate is typically mixed with water to form:
,A. Aqueous suppressant powder
B. Foam solution
C. Dry chemical agent
D. Halocarbon mixture
Rationale: The first mixture created is the foam solution before aeration
forms finished foam.
3. Which pipe color coding commonly indicates foam concentrate lines?
A. Blue
B. Green
C. Yellow
D. Orange
Rationale: Industry practice uses yellow for foam concentrate to
differentiate from normal water piping.
4. Which NFPA standard applies to foam-water sprinkler systems?
A. NFPA 10
B. NFPA 12
C. NFPA 16
D. NFPA 24
Rationale: NFPA 16 governs the installation of foam-water sprinkler and
foam-water spray systems.
,5. A proportioner’s function is to:
A. Agitate finished foam
B. Introduce foam concentrate into the water stream at a set ratio
C. Remove air from piping
D. Provide secondary power
Rationale: The proportioner meters concentrate into the water to create
foam solution.
6. Which hazard class most commonly requires foam-water systems?
A. Class A solids
B. Class B flammable liquids
C. Class C energized equipment
D. Class K cooking oils
Rationale: Foam suppresses vapor release from flammable-liquid fuels.
7. A bladder tank uses:
A. Compressed air to inject concentrate
B. Water pressure to force concentrate from a bladder
C. Manual pumping
D. Mechanical refrigeration
, Rationale: System water pressure squeezes the internal bladder to
discharge concentrate.
8. Which of the following is a fixed foam-water discharge device?
A. Fog nozzle
B. Foam-water sprinkler head
C. Portable aerator
D. Handline eductor
Rationale: Foam-water sprinklers are permanently installed discharge
devices.
9. The minimum supervisor requirement for S-15 is:
A. On-site technical engineer
B. Master electrician
C. Fire and life safety certificate holder
D. Licensed plumber
Rationale: FDNY requires a certificate holder to supervise foam-water
systems.
10. An S-15 certificate holder must inspect the system:
