CHST CHST - Construction Health and Safety Technician Emergency and Fire Preparedness Questions and Answers 3 — Questions and Answers
Question 1: According to NFPA 10, how far must a portable fire extinguisher be located from a Class B hazard in a construction setting?
- 25 feet
- 50 feet (Correct answer)
- 75 feet
- 100 feet
Correct answer: 50 feet
NFPA 10 requires Class B fire extinguishers to be placed no more than 50 feet from the hazard.
Question 2: During a construction site emergency evacuation, who is typically responsible for accounting for all workers at the assembly point?
- The site safety officer
- Each individual worker independently
- The designated crew supervisor or foreman (Correct answer)
- The project owner's representative
Correct answer: The designated crew supervisor or foreman
Crew supervisors or foremen are typically assigned headcount accountability at assembly areas during evacuations.
Question 3: A 'fire watch' on a construction site is required to remain on duty for how long after hot work operations cease, per OSHA guidelines?
- 15 minutes
- 30 minutes (Correct answer)
- 60 minutes
- Until the next shift
Correct answer: 30 minutes
OSHA requires a fire watch to be maintained for at least 30 minutes after hot work is completed to detect smoldering fires.
Question 4: Which class of fire extinguisher is specifically designed to fight fires involving energized electrical equipment on a construction site?
- Class A
- Class B
- Class C (Correct answer)
- Class D
Correct answer: Class C
Class C extinguishers use non-conductive agents and are rated for energized electrical equipment fires.
Question 5: What is the primary purpose of a pre-incident plan (pre-fire plan) developed for a construction site?
- To document worker injuries for insurance
- To provide responding emergency services with site-specific information (Correct answer)
- To satisfy OSHA recordkeeping requirements
- To schedule fire drills for workers
Correct answer: To provide responding emergency services with site-specific information
Pre-incident plans give responding fire departments critical site layout, hazard, and access information before an emergency occurs.
Question 6: Under 29 CFR 1926.150, a fire extinguisher rated not less than 2A must be provided for each how many square feet of protected building area?
- 1,000 sq ft
- 2,000 sq ft
- 3,000 sq ft (Correct answer)
- 5,000 sq ft
Correct answer: 3,000 sq ft
29 CFR 1926.150(c)(1)(i) requires one 2A-rated extinguisher per 3,000 square feet of the protected building area.
Question 7: A construction worker discovers a small trash fire in a dumpster near a structure. What should be the worker's FIRST action?
- Attempt to extinguish it immediately with a nearby extinguisher
- Activate the site alarm and notify others before attempting suppression (Correct answer)
- Evacuate the site completely without attempting suppression
- Call the project manager to get approval to act
Correct answer: Activate the site alarm and notify others before attempting suppression
Life safety takes priority—workers must alert others by activating the alarm before attempting any suppression efforts.
CHST CHST - Construction Health and Safety Technician Emergency and Fire Preparedness Questions and Answers 3
According to NFPA 10, how far must a portable fire extinguisher be located from a Class B hazard in a construction setting?