Texas Future Farmers of America (FFA) Agricultural Technology and Mechanical Systems Career Development Events (CDE) Practice Exam

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A Class D fire indicates what type of material is burning?

Wood

Liquid

Metal

A Class D fire specifically refers to fires that involve combustible metals. Examples of materials that can ignite and sustain a fire in this category include magnesium, titanium, and sodium. These metals have unique properties—they can burn at extremely high temperatures and react violently with water or other substances.

Understanding fire classifications is crucial for effective firefighting and safety measures. Class D fires require special agents for extinguishing, such as dry powder agents specifically designed for metal fires, as traditional methods like water can exacerbate the situation.

The other classifications—like Class A for ordinary combustibles such as wood, Class B for flammable liquids such as gasoline, and Class C for gases—differ in the materials involved, indicating why those answers do not align with the defining characteristics of a Class D fire.

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Gasoline

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