CPD CPD Fire Protection & Suppression Systems 1 — Questions and Answers
Question 1: Which NFPA standard governs the installation of water-based fire suppression sprinkler systems in the US?
- NFPA 13 (Correct answer)
- NFPA 14
- NFPA 20
- NFPA 72
Correct answer: NFPA 13
NFPA 13, Standard for the Installation of Sprinkler Systems, is the primary US standard governing the design and installation of water-based automatic fire sprinkler systems.
Question 2: What is the purpose of a fire department connection (FDC) on a sprinkler system?
- To allow fire department pumper trucks to supplement system water supply during a fire (Correct answer)
- To serve as the primary water meter for the sprinkler system's domestic supply
- To provide a test connection for measuring sprinkler system flow and pressure
- To drain residual water from sprinkler piping after system testing
Correct answer: To allow fire department pumper trucks to supplement system water supply during a fire
The FDC allows fire department pumper trucks to inject additional water pressure and volume into the sprinkler system when building water supply is insufficient during a fire.
Question 3: What is the difference between a wet-pipe and a dry-pipe sprinkler system?
- Wet-pipe systems contain water in the piping at all times; dry-pipe systems use pressurized air with water only released upon sprinkler activation (Correct answer)
- Wet-pipe systems use antifreeze; dry-pipe systems use pressurized nitrogen only
- Wet-pipe systems are for outdoor use; dry-pipe systems are required in all indoor applications
- Wet-pipe systems discharge foam; dry-pipe systems discharge only water
Correct answer: Wet-pipe systems contain water in the piping at all times; dry-pipe systems use pressurized air with water only released upon sprinkler activation
Wet-pipe systems keep piping continuously charged with water for immediate discharge, while dry-pipe systems use pressurized air that exhausts first to allow water into the pipes only after a sprinkler opens.
Question 4: In NFPA 13 sprinkler design, what does 'hazard classification' determine?
- The required water density and area of application used to size the sprinkler system (Correct answer)
- The required fire resistance rating of the building's structural members
- The type of detector required in each occupancy for early warning
- The minimum separation distance between sprinkler heads and light fixtures
Correct answer: The required water density and area of application used to size the sprinkler system
Hazard classification (light, ordinary, extra) determines the design water density in gallons per minute per square foot and the design area used to calculate sprinkler system demand.
Question 5: What is a backflow preventer's role in a fire protection system connected to a potable water supply?
- To prevent contaminated fire suppression water from flowing back into the potable water supply (Correct answer)
- To boost water pressure to sprinkler heads located above the street main elevation
- To reduce static pressure in the sprinkler main to prevent pipe joint leakage
- To isolate individual sprinkler zones for independent testing and maintenance
Correct answer: To prevent contaminated fire suppression water from flowing back into the potable water supply
A backflow preventer on the fire protection supply connection ensures that water in sprinkler piping, which may contain corrosion inhibitors or other contaminants, cannot back-siphon into the potable water system.
Question 6: What is the minimum residual pressure typically required at the most remote sprinkler head per NFPA 13?
- 7 psi (Correct answer)
- 5 psi
- 15 psi
- 25 psi
Correct answer: 7 psi
NFPA 13 requires a minimum residual pressure of 7 psi at the most hydraulically remote sprinkler head to ensure adequate water distribution during a fire event.
CPD CPD Fire Protection & Suppression Systems 1
Which NFPA standard governs the installation of water-based fire suppression sprinkler systems in the US?