27. «Dry Powder» fire extinguishers, which contain a mixture of graphite and sodium chloride as the extinguishing agent, are generally used to fight which type of fire?

Dry powder extinguishers containing graphite and sodium chloride are specifically designed for Class D fires involving combustible metals. These extinguishers work by smothering the metal and absorbing heat, unlike extinguishers used for Class A (ordinary combustibles), Class B (flammable liquids), or Class C (electrical) fires.