F-02 Fire Extinguisher Use and Classification 1 — Questions and Answers
Question 1: Which class of fire involves ordinary combustibles such as wood, paper, cloth, and trash?
- Class B
- Class A (Correct answer)
- Class C
- Class D
Correct answer: Class A
Class A fires involve ordinary combustibles like wood, paper, cloth, and plastics, which are the most common fire type in assembly occupancies.
Question 2: What class of fire extinguisher is required for use on energized electrical equipment?
- Class A
- Class B
- Class C (Correct answer)
- Class K
Correct answer: Class C
Class C extinguishers use non-conductive agents (such as CO2 or dry chemical) safe for use on energized electrical fires without risk of electrocution.
Question 3: What does the acronym PASS stand for when operating a portable fire extinguisher?
- Pull, Aim, Squeeze, Sweep (Correct answer)
- Point, Activate, Spray, Stand
- Pull, Activate, Shoot, Sweep
- Position, Aim, Spray, Stop
Correct answer: Pull, Aim, Squeeze, Sweep
PASS stands for Pull the pin, Aim at the base of the fire, Squeeze the handle, and Sweep side to side — the correct procedure for using any portable extinguisher.
Question 4: Class K fire extinguishers are specifically designed to combat fires involving which materials?
- Combustible metals
- Flammable gases
- Cooking oils and animal fats (Correct answer)
- Ordinary paper and cardboard
Correct answer: Cooking oils and animal fats
Class K extinguishers use wet chemical agents designed for high-temperature cooking oil and animal fat fires typically found in commercial kitchens.
Question 5: Which type of fire extinguisher agent is most effective for Class B fires involving flammable liquids such as gasoline?
- Water
- CO2 or dry chemical (Correct answer)
- Wet chemical
- Water mist
Correct answer: CO2 or dry chemical
CO2 and dry chemical extinguishers are rated for Class B fires because they smother or interrupt the chemical chain reaction without spreading the burning liquid.
Question 6: A fireguard notices a fire extinguisher has a label marked 'ABC.' What does this mean?
- The extinguisher is past its service date
- It can only be used on three specific fires
- It is effective on Class A, B, and C fires (Correct answer)
- It requires special training to operate
Correct answer: It is effective on Class A, B, and C fires
An ABC rating indicates the extinguisher (typically multi-purpose dry chemical) is approved for ordinary combustibles, flammable liquids, and electrical fires.
Question 7: Which extinguisher type should NEVER be used on a Class D fire involving combustible metals such as magnesium?
- Dry powder (Class D rated)
- Water
- Both water and standard dry chemical (Correct answer)
- CO2 only
Correct answer: Both water and standard dry chemical
Water reacts violently with burning metals, and standard dry chemical can intensify some metal fires; only specialized Class D dry powder extinguishers are safe for combustible metal fires.
F-02 Fire Extinguisher Use and Classification 1
Which class of fire involves ordinary combustibles such as wood, paper, cloth, and trash?