FDNY S-15 – SUPERVISION OF FOAM-WATER
SPRINKLER SYSTEMS (CITYWIDE) – PRACTICE
QUESTIONS WITH ANSWERS & RATIONALES
2026-2027
EXAM SECTION 1: FDNY RULES & REGULATIONS
(Questions 1-40)
FDNY S-15 FOAM-WATER SPRINKLER SYSTEMS – SET
2: 50 ADDITIONAL UNIQUE QUESTIONS (NO REPEATS)
1. According to 3 RCNY 901-07, what is the minimum frequency for testing a
foam-water sprinkler system's foam concentrate?
A) Every 6 months
B) Annually
C) Every 2 years
D) Every 5 years
*Answer: B) Annually
Rationale: 3 RCNY 901-07 requires annual testing of foam concentrate for quality. This
ensures the foam concentrate maintains its effectiveness over time. The test must be
performed by a qualified laboratory and results documented in the system's maintenance
log.
,2. What is the maximum distance allowed between a foam-water sprinkler
system's control valve and the protected area?
A) 25 feet
B) 50 feet
C) 75 feet
D) 100 feet
*Answer: C) 75 feet
Rationale: FDNY rules require that control valves for foam-water sprinkler systems be
located within 75 feet of the protected area. This ensures quick access for system operation
and shutdown. The valves must also be clearly marked and accessible at all times.
3. Which of the following is a required component of a foam-water sprinkler
system's alarm system?
A) Water flow alarm
B) Low-pressure alarm
C) Trouble alarm
D) All of the above
*Answer: D) All of the above
Rationale: Foam-water sprinkler systems require water flow alarms (to indicate system
operation), low-pressure alarms (to indicate pressure loss), and trouble alarms (to indicate
system problems). All alarms must be connected to a central monitoring station.
4. According to NFPA 11, what is the minimum expansion ratio for AFFF foam used
in a sprinkler system?
A) 2:1
B) 3:1
C) 4:1
D) 5:1
*Answer: D) 5:1
Rationale: NFPA 11 requires a minimum expansion ratio of 5:1 for AFFF foam in sprinkler
systems. This ensures that the foam provides adequate coverage and vapor suppression.
Expansion ratio is tested during annual quality testing.
,5. What is the purpose of the foam-water sprinkler system's test and drain valve?
A) To test the system without discharging foam
B) To drain the system for maintenance
C) To test the water flow alarm
D) All of the above
*Answer: D) All of the above
Rationale: The test and drain valve allows for system testing without discharging foam
into the protected area, draining the system for maintenance, and testing the water flow
alarm. It is a critical component for system maintenance and testing.
6. According to FDNY rules, what is the maximum allowed pressure drop in a
foam-water sprinkler system during a flow test?
A) 5 psi
B) 10 psi
C) 15 psi
D) 20 psi
*Answer: C) 15 psi
Rationale: FDNY rules limit the pressure drop during a flow test to 15 psi. A higher
pressure drop indicates a problem with the system, such as a partially closed valve or a
blockage. The test must be performed annually.
7. Which of the following is a common cause of foam concentrate contamination?
A) Water intrusion
B) Oil or grease contamination
C) Bacterial growth
D) All of the above
*Answer: D) All of the above
Rationale: Foam concentrate can be contaminated by water intrusion, oil or grease
contamination, and bacterial growth. Contamination can degrade the foam's performance
and cause it to fail. Proper storage and handling prevent contamination.
, 8. What is the purpose of the foam-water sprinkler system's check valve on the
water supply line?
A) To prevent backflow of foam concentrate
B) To prevent backflow of contaminated water
C) To prevent water hammer
D) To regulate water pressure
*Answer: B) To prevent backflow of contaminated water
Rationale: A check valve on the water supply line prevents contaminated water or foam
from flowing back into the potable water supply. This is a critical backflow prevention
requirement. The check valve must be tested regularly.
9. According to NFPA 11, what is the maximum allowed storage temperature for
AFFF foam concentrate?
A) 100°F
B) 110°F
C) 120°F
D) 130°F
*Answer: C) 120°F
Rationale: NFPA 11 recommends a maximum storage temperature of 120°F for AFFF foam
concentrate. Temperatures above this can degrade the concentrate. Storage areas must be
protected from excessive heat and direct sunlight.
10. What is the purpose of the foam-water sprinkler system's pressure relief valve?
A) To prevent over-pressurization of the system
B) To regulate system pressure
C) To protect system components from damage
D) All of the above
*Answer: D) All of the above
Rationale: The pressure relief valve prevents over-pressurization, regulates system
SPRINKLER SYSTEMS (CITYWIDE) – PRACTICE
QUESTIONS WITH ANSWERS & RATIONALES
2026-2027
EXAM SECTION 1: FDNY RULES & REGULATIONS
(Questions 1-40)
FDNY S-15 FOAM-WATER SPRINKLER SYSTEMS – SET
2: 50 ADDITIONAL UNIQUE QUESTIONS (NO REPEATS)
1. According to 3 RCNY 901-07, what is the minimum frequency for testing a
foam-water sprinkler system's foam concentrate?
A) Every 6 months
B) Annually
C) Every 2 years
D) Every 5 years
*Answer: B) Annually
Rationale: 3 RCNY 901-07 requires annual testing of foam concentrate for quality. This
ensures the foam concentrate maintains its effectiveness over time. The test must be
performed by a qualified laboratory and results documented in the system's maintenance
log.
,2. What is the maximum distance allowed between a foam-water sprinkler
system's control valve and the protected area?
A) 25 feet
B) 50 feet
C) 75 feet
D) 100 feet
*Answer: C) 75 feet
Rationale: FDNY rules require that control valves for foam-water sprinkler systems be
located within 75 feet of the protected area. This ensures quick access for system operation
and shutdown. The valves must also be clearly marked and accessible at all times.
3. Which of the following is a required component of a foam-water sprinkler
system's alarm system?
A) Water flow alarm
B) Low-pressure alarm
C) Trouble alarm
D) All of the above
*Answer: D) All of the above
Rationale: Foam-water sprinkler systems require water flow alarms (to indicate system
operation), low-pressure alarms (to indicate pressure loss), and trouble alarms (to indicate
system problems). All alarms must be connected to a central monitoring station.
4. According to NFPA 11, what is the minimum expansion ratio for AFFF foam used
in a sprinkler system?
A) 2:1
B) 3:1
C) 4:1
D) 5:1
*Answer: D) 5:1
Rationale: NFPA 11 requires a minimum expansion ratio of 5:1 for AFFF foam in sprinkler
systems. This ensures that the foam provides adequate coverage and vapor suppression.
Expansion ratio is tested during annual quality testing.
,5. What is the purpose of the foam-water sprinkler system's test and drain valve?
A) To test the system without discharging foam
B) To drain the system for maintenance
C) To test the water flow alarm
D) All of the above
*Answer: D) All of the above
Rationale: The test and drain valve allows for system testing without discharging foam
into the protected area, draining the system for maintenance, and testing the water flow
alarm. It is a critical component for system maintenance and testing.
6. According to FDNY rules, what is the maximum allowed pressure drop in a
foam-water sprinkler system during a flow test?
A) 5 psi
B) 10 psi
C) 15 psi
D) 20 psi
*Answer: C) 15 psi
Rationale: FDNY rules limit the pressure drop during a flow test to 15 psi. A higher
pressure drop indicates a problem with the system, such as a partially closed valve or a
blockage. The test must be performed annually.
7. Which of the following is a common cause of foam concentrate contamination?
A) Water intrusion
B) Oil or grease contamination
C) Bacterial growth
D) All of the above
*Answer: D) All of the above
Rationale: Foam concentrate can be contaminated by water intrusion, oil or grease
contamination, and bacterial growth. Contamination can degrade the foam's performance
and cause it to fail. Proper storage and handling prevent contamination.
, 8. What is the purpose of the foam-water sprinkler system's check valve on the
water supply line?
A) To prevent backflow of foam concentrate
B) To prevent backflow of contaminated water
C) To prevent water hammer
D) To regulate water pressure
*Answer: B) To prevent backflow of contaminated water
Rationale: A check valve on the water supply line prevents contaminated water or foam
from flowing back into the potable water supply. This is a critical backflow prevention
requirement. The check valve must be tested regularly.
9. According to NFPA 11, what is the maximum allowed storage temperature for
AFFF foam concentrate?
A) 100°F
B) 110°F
C) 120°F
D) 130°F
*Answer: C) 120°F
Rationale: NFPA 11 recommends a maximum storage temperature of 120°F for AFFF foam
concentrate. Temperatures above this can degrade the concentrate. Storage areas must be
protected from excessive heat and direct sunlight.
10. What is the purpose of the foam-water sprinkler system's pressure relief valve?
A) To prevent over-pressurization of the system
B) To regulate system pressure
C) To protect system components from damage
D) All of the above
*Answer: D) All of the above
Rationale: The pressure relief valve prevents over-pressurization, regulates system
