Firefighter Practice Exam

A drill press operator notices smoking metallic waste that could ignite. Which type of fire extinguisher is most appropriate for this situation?

1. Class A

2. Class B

3. Class C

4. Class D

The correct answer is: Class B

In this scenario, the drill press operator is dealing with metallic waste, which poses a risk of ignition due to smoking. The most appropriate type of fire extinguisher for this situation is a Class B extinguisher. Class B fire extinguishers are specifically designed to combat fires caused by flammable liquids, gases, and greases. While it may seem that metallic materials would belong to another class, the smoking indicates that there is potential for combustion from leftover lubricants or other flammable substances that might be present—especially in a workshop or machinery environment. Therefore, a Class B extinguisher is most effective in suppressing fires that may arise from these materials by smothering the flames and preventing further ignition. Class A extinguishers are suitable for ordinary combustible materials such as wood and paper, while Class C extinguishers are used for electrical fires, and Class D extinguishers are specifically made for combustible metals. Since the situation involves smoking metallic waste, Class B is the best choice to effectively address the immediate fire risk.