FST Fire Detection & Suppression Systems 4 — Questions and Answers
Question 1: A rate-of-rise heat detector will activate when:
- Temperature exceeds 135°F
- Temperature rises more than 12-15°F per minute (Correct answer)
- Relative humidity drops below 30%
- Smoke obscures more than 3% per foot
Correct answer: Temperature rises more than 12-15°F per minute
Rate-of-rise detectors activate when temperature increases at a rate exceeding approximately 12-15°F per minute, regardless of the actual temperature reached.
Question 2: In a zoned fire alarm system, what is the primary benefit of dividing a building into multiple zones?
- It reduces the number of detectors needed
- It allows first responders to quickly locate the area of alarm (Correct answer)
- It eliminates the need for manual pull stations
- It automatically notifies the local fire department
Correct answer: It allows first responders to quickly locate the area of alarm
Zoning allows the FACP to indicate which specific area of the building has activated, helping responders quickly locate and respond to the emergency.
Question 3: What is the primary hazard of using a CO2 extinguisher in a small, enclosed space?
- It can cause electrical shorts
- It may displace enough oxygen to cause asphyxiation (Correct answer)
- It accelerates burning of Class A materials
- It corrodes metal surfaces
Correct answer: It may displace enough oxygen to cause asphyxiation
CO2 suppresses fire by displacing oxygen, and in a confined space this oxygen displacement can reach dangerous levels that cause asphyxiation for occupants.
Question 4: Which type of sprinkler head responds fastest in a fire and is designed to protect high-value equipment?
- Standard response (SR) sprinkler
- Quick response (QR) sprinkler (Correct answer)
- Extended coverage (EC) sprinkler
- Residential sprinkler
Correct answer: Quick response (QR) sprinkler
Quick response (QR) sprinklers have a smaller thermal element and activate faster, reducing heat, smoke, and fire spread in the critical early stages.
Question 5: NFPA 25 applies to which fire protection activity?
- Installation of new sprinkler systems
- Design of fire alarm systems
- Inspection, testing, and maintenance of water-based fire protection systems (Correct answer)
- Training of fire safety technicians
Correct answer: Inspection, testing, and maintenance of water-based fire protection systems
NFPA 25 is the Standard for the Inspection, Testing, and Maintenance of Water-Based Fire Protection Systems, covering ongoing ITM requirements after installation.
Question 6: A Class K fire extinguisher is specifically designed for use on fires involving:
- Energized electrical equipment
- Combustible metals
- Cooking oils and fats in commercial kitchens (Correct answer)
- Flammable liquids in industrial settings
Correct answer: Cooking oils and fats in commercial kitchens
Class K extinguishers use wet chemical agents specifically formulated to suppress fires in cooking appliances involving vegetable and animal oils and fats.
Question 7: When testing a waterflow alarm on a wet pipe sprinkler system, which device is used to simulate sprinkler flow without actually discharging water through a head?
- Main drain valve
- Inspector's test connection (ITC) (Correct answer)
- OS&Y valve
- Check valve
Correct answer: Inspector's test connection (ITC)
The inspector's test connection (ITC) is a small orifice valve that simulates the flow of one sprinkler head to test waterflow alarms and devices without opening a sprinkler.
FST Fire Detection & Suppression Systems 4
A rate-of-rise heat detector will activate when: