Class 5 Boiler Practice Exam

What does a Class B fire specifically involve?

1. Flammable gases

2. Flammable liquids

3. Electrical equipment

4. Metal fires

The correct answer is: Flammable liquids

A Class B fire specifically involves flammable liquids. These types of fires are fueled by substances such as gasoline, oil, grease, and other liquid substances that can ignite and produce a significant amount of flames. Fighting Class B fires often requires specialized extinguishing agents, such as foam or dry chemical extinguishers, which are specifically designed to smother the flames and prevent the fire from spreading. In the context of fire safety and firefighting, understanding the classification of fires is essential for choosing the correct firefighting equipment and tactics. For example, water is ineffective and can even exacerbate a Class B fire because it can spread the flammable liquid. Instead, other methods or agents must be utilized to combat these types of fires effectively.