Fire Safety Fire Safety Equipment and Alarm Systems 4 — Questions and Answers
Question 1: A photoelectric smoke detector is BEST suited for detecting which type of fire?
- Fast-flaming fires with little smoke
- Slow, smoldering fires that produce heavy smoke (Correct answer)
- Electrical fires only
- Grease fires in kitchens
Correct answer: Slow, smoldering fires that produce heavy smoke
Photoelectric detectors use a light beam and are most effective at detecting slow, smoldering fires that produce large smoke particles.
Question 2: What does a yellow/amber LED status light typically indicate on a fire alarm control panel?
- System is in normal operation
- A trouble or supervisory condition exists (Correct answer)
- An active alarm is sounding
- The panel has lost AC power completely
Correct answer: A trouble or supervisory condition exists
Yellow or amber LEDs on a fire alarm panel indicate a trouble or supervisory condition that needs attention but is not an active fire alarm.
Question 3: Which class of fire extinguisher is REQUIRED near a server room or electrical equipment area?
- Class A
- Class B
- Class C (Correct answer)
- Class D
Correct answer: Class C
Class C extinguishers use non-conductive agents and are required for energized electrical equipment fires.
Question 4: A wet pipe sprinkler system differs from a dry pipe system in that wet pipe systems:
- Require manual activation by a fire warden
- Are always pressurized with water ready to discharge (Correct answer)
- Use compressed air instead of water in the pipes
- Only activate when two separate detectors trigger
Correct answer: Are always pressurized with water ready to discharge
Wet pipe systems keep water pressurized in the pipes at all times, allowing immediate discharge when a sprinkler head activates.
Question 5: What is the recommended minimum travel distance between fire extinguishers in a commercial building for Class A hazards according to NFPA 10?
- 25 feet
- 50 feet
- 75 feet (Correct answer)
- 100 feet
Correct answer: 75 feet
NFPA 10 requires that Class A extinguishers be placed so no point in the building is more than 75 feet of travel distance from an extinguisher.
Question 6: A fire alarm system's 'supervisory signal' is triggered when:
- Smoke is detected in a protected area
- A monitored system component moves out of its normal position (e.g., a closed sprinkler valve) (Correct answer)
- The alarm panel loses communication with the monitoring center
- A manual pull station is activated
Correct answer: A monitored system component moves out of its normal position (e.g., a closed sprinkler valve)
Supervisory signals alert that a monitored device — such as a sprinkler control valve — has moved to an abnormal position that could impair the system.
Question 7: Carbon monoxide detectors should be installed at what height in a residential setting?
- Near the floor, since CO is heavier than air
- At or near ceiling level only
- At breathing level, typically 5 feet from the floor, or per manufacturer instructions (Correct answer)
- Only inside HVAC return air vents
Correct answer: At breathing level, typically 5 feet from the floor, or per manufacturer instructions
CO detectors should be installed at breathing level (about 5 feet) or per the manufacturer's instructions, since CO mixes evenly with air.
Fire Safety Fire Safety Equipment and Alarm Systems 4
A photoelectric smoke detector is BEST suited for detecting which type of fire?