Class 5 Boiler Practice Exam

What class of fire is primarily fueled by liquids?

1. Class A

2. Class B

3. Class C

4. Class D

The correct answer is: Class B

The class of fire that is primarily fueled by liquids is classified as Class B. This classification encompasses flammable or combustible liquids such as gasoline, oil, alcohol, and other solvents. Fires in this category require specific extinguishing agents, as the nature of the fuel can lead to rapid spread and intense heat. For example, water is ineffective on Class B fires because it can spread the burning liquid, potentially making the situation worse. Instead, extinguishers designed for Class B fires often utilize foam, dry chemical agents, or carbon dioxide, which work to suffocate the fire and cut off its oxygen supply. Understanding fire classifications, including the behavior of flammable liquids, is crucial for effective fire prevention and response strategies in various environments. This knowledge helps in selecting the appropriate firefighting methods and equipment to safely extinguish a fire.