Deluge and Preaction
Systems questions with
answers in pure English
(Q1–Q25)
1. What is the primary distinguishing feature of a deluge system?
A. It uses closed sprinklers
B. It uses open sprinklers and a deluge valve activated by detection
C. It contains water under pressure at all times
D. It uses air pressure to hold water back
Answer: B
Rationale: Deluge systems use open discharge devices and a deluge valve that admits water
when the detection system operates .
2. What is a double interlock preaction system designed to prevent?
A. Water from freezing
B. Accidental water discharge into the piping
C. Detection system activation
D. Valve operation
Answer: B
Rationale: A double interlock preaction system requires two independent events (detection
system operation AND loss of supervisory air, such as a fused sprinkler) before water enters
the piping, reducing accidental discharge risk .
3. How often should a full flow trip test on a deluge valve be performed?
A. Annually in cold weather
B. Annually in warm weather
C. Every 3 years
D. Monthly
Answer: B
Rationale: NFPA 25 requires full flow trip tests on deluge valves to be performed annually in
warm weather to prevent freezing issues during testing .
,4. When performing an external inspection of a preaction or deluge valve monthly, which
conditions should be verified? (Select three.)
A. Electrical components are in service
B. Trim valves are in proper open/closed positions
C. Valve seat is not leaking
D. The valve is painted
Answer: A, B, C
Rationale: Monthly external inspections verify that electrical components are in service,
trim valves are in proper positions, and the valve seat is not leaking .
5. How often should the priming water level in a deluge or preaction valve (where
applicable) be tested?
A. Monthly
B. Quarterly
C. Annually
D. Every 5 years
Answer: B
Rationale: NFPA 25 Section 13.4.4 requires the priming water level in deluge and preaction
valves that use priming water to be tested quarterly .
6. How often should low air pressure alarms on preaction systems be tested?
A. Weekly
B. Monthly
C. Quarterly
D. Annually
Answer: C
Rationale: NFPA 25 requires low air pressure alarms on preaction systems to be tested
quarterly in accordance with the manufacturer's instructions .
7. What is the purpose of the manual actuation device on a deluge or preaction system?
A. To test the alarm
B. To manually operate the valve for testing or emergency
C. To drain the system
D. To measure pressure
Answer: B
Rationale: Manual actuation devices allow the valve to be operated manually for testing or
in an emergency. NFPA 25 requires them to be operated annually .
8. During cold weather, how often should the heating in an unheated enclosure protecting
a preaction valve (without a low-temperature alarm) be inspected?
A. Weekly
, B. Monthly
C. Daily
D. Quarterly
Answer: C
Rationale: NFPA 25 requires daily inspection during cold weather to verify a minimum 40°F
(4°C) is maintained in valve enclosures without low-temperature supervision .
9. How often should strainers, filters, and restriction orifices in the trim of deluge and
preaction valves be inspected internally?
A. Monthly
B. Annually
C. Every 3 years
D. Every 5 years
Answer: D
Rationale: NFPA 25 requires internal inspection of valve trim strainers, filters, and restriction
orifices every 5 years unless tests indicate more frequent inspection is needed .
10. What is the purpose of the relief valve on a deluge or preaction system?
A. To increase pressure
B. To relieve excess pressure
C. To measure flow
D. To activate the alarm
Answer: B
Rationale: The relief valve protects the system from overpressure conditions.
11. A preaction system protecting a freezer should be trip tested how often?
A. Monthly
B. Quarterly
C. Annually
D. Every 3 years
Answer: C
Rationale: Preaction systems protecting freezers should be trip tested annually. Testing must
be conducted without introducing moisture into the freezer piping .
12. How often should preaction systems be tested for leakage?
A. Annually
B. Every 2 years
C. Every 3 years
D. Every 5 years
Answer: C
Rationale: Preaction systems should be tested for leakage every 3 years .
Systems questions with
answers in pure English
(Q1–Q25)
1. What is the primary distinguishing feature of a deluge system?
A. It uses closed sprinklers
B. It uses open sprinklers and a deluge valve activated by detection
C. It contains water under pressure at all times
D. It uses air pressure to hold water back
Answer: B
Rationale: Deluge systems use open discharge devices and a deluge valve that admits water
when the detection system operates .
2. What is a double interlock preaction system designed to prevent?
A. Water from freezing
B. Accidental water discharge into the piping
C. Detection system activation
D. Valve operation
Answer: B
Rationale: A double interlock preaction system requires two independent events (detection
system operation AND loss of supervisory air, such as a fused sprinkler) before water enters
the piping, reducing accidental discharge risk .
3. How often should a full flow trip test on a deluge valve be performed?
A. Annually in cold weather
B. Annually in warm weather
C. Every 3 years
D. Monthly
Answer: B
Rationale: NFPA 25 requires full flow trip tests on deluge valves to be performed annually in
warm weather to prevent freezing issues during testing .
,4. When performing an external inspection of a preaction or deluge valve monthly, which
conditions should be verified? (Select three.)
A. Electrical components are in service
B. Trim valves are in proper open/closed positions
C. Valve seat is not leaking
D. The valve is painted
Answer: A, B, C
Rationale: Monthly external inspections verify that electrical components are in service,
trim valves are in proper positions, and the valve seat is not leaking .
5. How often should the priming water level in a deluge or preaction valve (where
applicable) be tested?
A. Monthly
B. Quarterly
C. Annually
D. Every 5 years
Answer: B
Rationale: NFPA 25 Section 13.4.4 requires the priming water level in deluge and preaction
valves that use priming water to be tested quarterly .
6. How often should low air pressure alarms on preaction systems be tested?
A. Weekly
B. Monthly
C. Quarterly
D. Annually
Answer: C
Rationale: NFPA 25 requires low air pressure alarms on preaction systems to be tested
quarterly in accordance with the manufacturer's instructions .
7. What is the purpose of the manual actuation device on a deluge or preaction system?
A. To test the alarm
B. To manually operate the valve for testing or emergency
C. To drain the system
D. To measure pressure
Answer: B
Rationale: Manual actuation devices allow the valve to be operated manually for testing or
in an emergency. NFPA 25 requires them to be operated annually .
8. During cold weather, how often should the heating in an unheated enclosure protecting
a preaction valve (without a low-temperature alarm) be inspected?
A. Weekly
, B. Monthly
C. Daily
D. Quarterly
Answer: C
Rationale: NFPA 25 requires daily inspection during cold weather to verify a minimum 40°F
(4°C) is maintained in valve enclosures without low-temperature supervision .
9. How often should strainers, filters, and restriction orifices in the trim of deluge and
preaction valves be inspected internally?
A. Monthly
B. Annually
C. Every 3 years
D. Every 5 years
Answer: D
Rationale: NFPA 25 requires internal inspection of valve trim strainers, filters, and restriction
orifices every 5 years unless tests indicate more frequent inspection is needed .
10. What is the purpose of the relief valve on a deluge or preaction system?
A. To increase pressure
B. To relieve excess pressure
C. To measure flow
D. To activate the alarm
Answer: B
Rationale: The relief valve protects the system from overpressure conditions.
11. A preaction system protecting a freezer should be trip tested how often?
A. Monthly
B. Quarterly
C. Annually
D. Every 3 years
Answer: C
Rationale: Preaction systems protecting freezers should be trip tested annually. Testing must
be conducted without introducing moisture into the freezer piping .
12. How often should preaction systems be tested for leakage?
A. Annually
B. Every 2 years
C. Every 3 years
D. Every 5 years
Answer: C
Rationale: Preaction systems should be tested for leakage every 3 years .
