Dry chemical extinguishers are commonly used for A, B, and C; Class D (metal fires) typically requires a specialized metal-fire agent.

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Multiple Choice

Dry chemical extinguishers are commonly used for A, B, and C; Class D (metal fires) typically requires a specialized metal-fire agent.

Dry chemical extinguishers are versatile because the powder interrupts the chemical reactions happening in a fire and blankets the fuel, slowing heat transfer and preventing re-ignition. This makes them effective on fires involving ordinary combustibles, flammable liquids, and energized electrical equipment. Metal fires, however, behave very differently. Metals such as magnesium or sodium can burn at very high temperatures and may react with water or some chemical powders, so they require a specialized metal-fire extinguishing agent formulated for that specific metal. That agent works by absorbing heat and creating a crust that isolates the metal from the air. So the best choice is the one that states dry chemical extinguishers cover A, B, and C, and that Class D fires need a specialized metal-fire agent. The other options miss either part of the A, B, C coverage or incorrectly claim all classes are extinguishable with the same approach.

Dry chemical extinguishers are versatile because the powder interrupts the chemical reactions happening in a fire and blankets the fuel, slowing heat transfer and preventing re-ignition. This makes them effective on fires involving ordinary combustibles, flammable liquids, and energized electrical equipment.

Metal fires, however, behave very differently. Metals such as magnesium or sodium can burn at very high temperatures and may react with water or some chemical powders, so they require a specialized metal-fire extinguishing agent formulated for that specific metal. That agent works by absorbing heat and creating a crust that isolates the metal from the air.

So the best choice is the one that states dry chemical extinguishers cover A, B, and C, and that Class D fires need a specialized metal-fire agent. The other options miss either part of the A, B, C coverage or incorrectly claim all classes are extinguishable with the same approach.

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