ASP Fire Prevention and Protection 2 — Questions and Answers
Question 1: Which class of fire involves energized electrical equipment?
- Class A
- Class B
- Class C (Correct answer)
- Class D
Correct answer: Class C
Class C fires involve energized electrical equipment. Once power is disconnected, the fire is reclassified based on the burning material.
The NFPA fire classification designates Class C fires as those involving energized electrical equipment. Only non-conductive extinguishing agents should be used.
Question 2: What is the maximum travel distance to a fire extinguisher 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 the maximum travel distance to an extinguisher for Class A hazards not exceed 75 feet.
NFPA 10 establishes maximum travel distances based on hazard class. For Class A hazards, the maximum is 75 feet. For Class B hazards, it is 50 feet.
Question 3: What does a fire watch involve?
- Installing new fire alarm systems
- Assigning trained personnel to continuously monitor for fire hazards during hot work (Correct answer)
- Conducting annual fire extinguisher inspections
- Reviewing building fire codes for compliance
Correct answer: Assigning trained personnel to continuously monitor for fire hazards during hot work
A fire watch involves stationing trained personnel to monitor the area during and after hot work operations.
A fire watch requires trained personnel stationed where hot work is performed, remaining for at least 30 minutes after hot work ceases per OSHA 29 CFR 1910.252 and NFPA 51B.
Question 4: Which type of sprinkler system contains water under pressure at all times and activates immediately when a sprinkler head is triggered?
- Dry pipe system
- Wet pipe system (Correct answer)
- Deluge system
- Pre-action system
Correct answer: Wet pipe system
Wet pipe systems maintain water under pressure at all times, allowing immediate discharge when a sprinkler head activates.
Wet pipe sprinkler systems are the most common and reliable type. When a sprinkler head's fusible link reaches activation temperature, it opens and immediately discharges water.
Question 5: What is the purpose of a fire damper in an HVAC system?
- To increase air circulation during a fire
- To prevent the spread of fire and smoke through ductwork (Correct answer)
- To activate the sprinkler system automatically
- To provide emergency ventilation for occupants
Correct answer: To prevent the spread of fire and smoke through ductwork
Fire dampers automatically close to prevent fire and smoke from spreading through the HVAC system at fire-rated wall and floor penetrations.
Fire dampers are passive fire protection devices installed in HVAC ductwork at fire-rated penetrations. When exposed to heat, a fusible link melts and allows the damper blade to close.
Question 6: According to NFPA 704, what does a rating of '4' in the red diamond indicate?
- Severe health hazard
- Extreme flammability - burns readily at ambient conditions (Correct answer)
- Material may detonate
- Extreme reactivity with water
Correct answer: Extreme flammability - burns readily at ambient conditions
In the NFPA 704 system, the red diamond represents flammability, and a rating of 4 indicates materials that rapidly vaporize and burn readily.
NFPA 704 uses a diamond-shaped placard with four colored sections: blue (health), red (flammability), yellow (instability), and white (special hazards). A red 4 indicates extreme flammability.
ASP Fire Prevention and Protection 2
Which class of fire involves energized electrical equipment?