F02 Sprinkler Systems — Questions and Answers
Question 1: What type of sprinkler system uses pressurized air in the pipes and only fills with water when activated?
- Wet pipe system
- Dry pipe system (Correct answer)
- Deluge system
- Pre-action system
Correct answer: Dry pipe system
Dry pipe systems maintain pressurized air or nitrogen in the pipes. When a sprinkler head activates, the air pressure drops, opening a valve to allow water to flow.
Question 2: What temperature rating do most standard sprinkler heads activate at?
- 100°F
- 135-165°F (Correct answer)
- 212°F
- 300°F
Correct answer: 135-165°F
Most ordinary-rated sprinkler heads are designed to activate at temperatures between 135°F and 165°F, which indicates a fire condition in the area.
Question 3: What is the purpose of a fire department connection (FDC) on a sprinkler system?
- To drain the sprinkler system
- To allow the fire department to supplement the water supply to the system (Correct answer)
- To test sprinkler heads
- To connect the alarm panel to FDNY
Correct answer: To allow the fire department to supplement the water supply to the system
The FDC allows firefighters to connect their hoses and pump additional water into the sprinkler system, supplementing the building's water supply during a fire.
Question 4: What does a tamper switch on a sprinkler control valve do?
- Measures water flow
- Sends an alarm signal when the valve is closed or partially closed (Correct answer)
- Controls water temperature
- Activates the sprinkler heads
Correct answer: Sends an alarm signal when the valve is closed or partially closed
Tamper switches monitor the position of sprinkler control valves and send a supervisory signal to the fire alarm panel if a valve is closed or tampered with.
Question 5: How many sprinkler heads typically must activate before a water flow alarm is triggered?
- All heads in the zone
- At least 5 heads
- Just one head (Correct answer)
- At least 3 heads
Correct answer: Just one head
A water flow alarm is typically triggered by the activation of just one sprinkler head, as any flow through the system indicates a fire condition.
Question 6: What is the main advantage of a wet pipe sprinkler system?
- It works in freezing temperatures
- It is the simplest and most reliable type with the fastest response time (Correct answer)
- It uses less water than other systems
- It can be manually controlled
Correct answer: It is the simplest and most reliable type with the fastest response time
Wet pipe systems are the simplest, most common, and most reliable sprinkler systems because water is already in the pipes and flows immediately when a head activates.
F02 Sprinkler Systems
What type of sprinkler system uses pressurized air in the pipes and only fills with water when activated?