CHST Emergency and Fire Preparedness 4 — Questions and Answers
Question 1: During a construction site emergency evacuation, who is responsible for conducting a headcount at the designated assembly area?
- The site owner
- The designated emergency warden or supervisor (Correct answer)
- OSHA inspector
- Local fire department
Correct answer: The designated emergency warden or supervisor
Designated emergency wardens or supervisors are assigned the responsibility of accounting for all workers at the assembly point after an evacuation.
Question 2: A portable fire extinguisher rated '2-A:10-B:C' is appropriate for use on which types of fires?
- Class A and Class B fires only
- Class A, Class B, and Class C fires (Correct answer)
- Class B and Class C fires only
- Class A and Class C fires only
Correct answer: Class A, Class B, and Class C fires
The 'A:B:C' rating indicates the extinguisher is suitable for ordinary combustibles (A), flammable liquids (B), and electrical fires (C).
Question 3: Under OSHA 29 CFR 1926.150, when must a fire extinguisher be present at a construction site?
- Only when flammable liquids exceed 5 gallons
- Whenever welding or cutting operations are performed indoors
- At all times during construction operations as a minimum standard (Correct answer)
- Only when the structure exceeds three stories
Correct answer: At all times during construction operations as a minimum standard
OSHA requires fire extinguishers to be available at all construction sites at a minimum, with additional requirements for specific hazards.
Question 4: What is the primary purpose of a fire watch during hot work operations?
- To document the work being performed
- To monitor for ignition of fires during and after hot work (Correct answer)
- To verify the welder's credentials
- To ensure ventilation equipment is functioning
Correct answer: To monitor for ignition of fires during and after hot work
A fire watch is maintained during and for at least 30 minutes after hot work to detect and extinguish any fires that may ignite from sparks or heat.
Question 5: Which factor most directly determines the required travel distance to a fire extinguisher on a construction site for Class B hazards?
- The extinguisher's weight
- The type of construction materials used
- The size and rating of the extinguisher relative to the hazard (Correct answer)
- The number of workers on site
Correct answer: The size and rating of the extinguisher relative to the hazard
OSHA requires extinguishers for Class B hazards to be placed so travel distance does not exceed 50 feet, with rating matched to hazard size.
Question 6: When a worker discovers a co-worker has stopped breathing after an electrical shock, what is the FIRST action to take?
- Begin CPR immediately
- Ensure the power source is de-energized before contact (Correct answer)
- Call for emergency medical services
- Move the victim to a safer location
Correct answer: Ensure the power source is de-energized before contact
Ensuring the power source is de-energized prevents the rescuer from also becoming a victim before rendering aid.
Question 7: Under OSHA's emergency action plan requirements (29 CFR 1910.38), what minimum element must be addressed regarding employee roles?
- List of emergency equipment vendors
- Assignment of rescue and medical duties to specific employees (Correct answer)
- Daily safety briefing schedule
- Building materials inventory
Correct answer: Assignment of rescue and medical duties to specific employees
OSHA requires emergency action plans to designate employees who have special roles in rescue and medical duties during emergencies.
CHST Emergency and Fire Preparedness 4
During a construction site emergency evacuation, who is responsible for conducting a headcount at the designated assembly area?