FST Fire Detection & Suppression Systems 3 — Questions and Answers
Question 1: In a clean agent suppression system using FK-5-1-12, the system is designed to suppress fire primarily by:
- Displacing oxygen below combustion levels
- Absorbing heat and interrupting the chemical chain reaction (Correct answer)
- Cooling fuel below its ignition temperature
- Creating a foam blanket over the hazard
Correct answer: Absorbing heat and interrupting the chemical chain reaction
FK-5-1-12 (Novec 1230) suppresses fire chiefly through heat absorption and chemical chain reaction interruption, with minimal oxygen reduction.
Question 2: What is the minimum number of audible notification appliances required on each floor of a building per NFPA 72?
- One per stairwell
- At least one per floor such that the alarm is audible throughout (Correct answer)
- Three per floor
- One per 10,000 sq ft
Correct answer: At least one per floor such that the alarm is audible throughout
NFPA 72 requires that audible notification appliances be sufficient to produce the required sound pressure levels throughout the entire floor.
Question 3: Which suppression agent is most appropriate for protecting a computer server room where equipment damage from agent residue is a concern?
- Dry chemical (ABC)
- Halon 1301 replacement (clean agent) (Correct answer)
- Carbon dioxide (CO2)
- Water mist
Correct answer: Halon 1301 replacement (clean agent)
Clean agents leave no residue after discharge, making them ideal for protecting sensitive electronic equipment like server rooms.
Question 4: A deluge sprinkler system is best suited for which type of hazard?
- Light-hazard office buildings
- High-hazard areas where rapid fire spread is expected (Correct answer)
- Cold storage warehouses prone to freezing
- Museums with sensitive artifacts
Correct answer: High-hazard areas where rapid fire spread is expected
Deluge systems have open sprinkler heads and discharge water simultaneously over the entire protected area, making them ideal for high-hazard occupancies with fast fire spread potential.
Question 5: When a duct smoke detector activates, what is its primary intended action?
- Trigger building evacuation immediately
- Shut down the HVAC system to prevent smoke spread (Correct answer)
- Activate the nearest sprinkler zone
- Open all fire dampers in the duct
Correct answer: Shut down the HVAC system to prevent smoke spread
Duct smoke detectors are primarily designed to shut down HVAC systems upon detecting smoke to prevent the spread of smoke and toxic gases through the ventilation system.
Question 6: The 'listed' designation on fire protection equipment means it has been:
- Approved only by the local Authority Having Jurisdiction (AHJ)
- Evaluated by a recognized testing laboratory and found to meet applicable standards (Correct answer)
- Registered with the NFPA
- Installed according to manufacturer instructions
Correct answer: Evaluated by a recognized testing laboratory and found to meet applicable standards
A 'listed' designation means the equipment has been tested by an accredited third-party laboratory (such as UL) and found to meet specific safety standards.
Question 7: How often must portable fire extinguishers be given a thorough internal examination (overhaul) per NFPA 10?
- Every year
- Every 3 years
- Every 6 years (Correct answer)
- Every 12 years
Correct answer: Every 6 years
NFPA 10 requires a 6-year internal examination for stored-pressure extinguishers, where the unit is emptied, inspected internally, recharged, and re-tagged.
FST Fire Detection & Suppression Systems 3
In a clean agent suppression system using FK-5-1-12, the system is designed to suppress fire primarily by: