Piney Point Basic Fire Fighting Practice Exam 2025 - Free Fire Fighting Practice Questions and Study Guide

The correct choice identifies the two types of dry chemical agents commonly used in fire extinguishers: ordinary and multi-purpose. Ordinary dry chemical agents are typically effective against Class B (flammable liquids) and Class C (electrical) fires, often containing monoammonium phosphate. Multi-purpose dry chemical agents are designed to be effective on Class A (ordinary combustibles, such as wood and paper) fires as well, making them more versatile and capable of extinguishing a wider variety of fire types.

This distinction is significant in firefighting because selecting the appropriate dry chemical extinguishing agent can enhance effectiveness and safety. Understanding these types enables firefighters and users to choose the correct fire extinguisher for the specific fire situation they may encounter.