A portable dry chemical fire extinguisher discharges by __________.
Official USCG Answer & Rule Citation
Correct Answer: Option A — pressure from a small CO2 cartridge on the extinguisher
Cartridge-operated portable dry chemical extinguishers rely on an internal or external gas propellant cartridge containing carbon dioxide or nitrogen, which is punctured or released to pressurize the cylinder and expel the dry chemical powder.
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