Question 845 Deck Safety

70% to pass

The most effective extinguishing action of dry chemical is _______________.

A breaking the chain reaction o o
B the CO2 that is formed by heat
C smothering
D shielding of radiant heat
AI Explanation

The correct answer is A) breaking the chain reaction. Dry chemical extinguishers work by interrupting the chemical chain reaction that occurs during a fire. The dry chemical agent, such as sodium bicarbonate or potassium bicarbonate, acts to break this chain reaction, thereby suppressing the fire. This is the most effective extinguishing action of dry chemical extinguishers. The other options are incorrect because they do not accurately describe the primary mechanism by which dry chemical extinguishers work. B) the CO2 that is formed by heat is not the primary extinguishing action. C) smothering is the mechanism for carbon dioxide (CO2) extinguishers, not dry chemical. D) shielding of radiant heat is not the main extinguishing action of dry chemical agents.

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Official Resources
46 CFR Lifesaving Equipment USCG Marine Safety Center USCG National Maritime Center
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