Ontario MTO Truck Knowledge Practice Test

Question: 1 / 400

Which type of fires are Class D fire extinguishers best suited for?

Burning wood

Burning paper

Burning metals

Class D fire extinguishers are specifically designed to combat fires caused by burning metals, such as magnesium, lithium, or titanium. This type of fire extinguisher contains a dry powder that smothers the fire and prevents it from spreading.

Option A and B, burning wood and paper, would be best handled by Class A or B fire extinguishers, respectively. These types of extinguishers are better equipped to fight fires caused by common combustible materials, such as paper, wood, or cloth.

Option D, electrical fires, would be best handled by a Class C fire extinguisher, as it contains materials that are non-conductive and can safely extinguish fires involving electrical equipment.

In summary, Class D fire extinguishers are best suited for combating fires caused by burning metals, and should not be used for fires involving other materials.

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