A _____ discharges a solution of water containing an alkali metal salt that prevents the freezing of the extinguishing agent.

A _____ discharges a solution of water containing an alkali metal salt that prevents the freezing of the extinguishing agent.

• A. stored-pressure extinguisher
• B. loaded-stream extinguisher
• C. foam extinguisher
• D. dry chemical extinguisher

Answer: (B)

This question tests knowledge of which water-based extinguisher uses a salt-containing solution to prevent the extinguishing agent from freezing. A loaded-stream extinguisher discharges a water-based solution, and in cold conditions it often contains an alkali metal salt to lower the freezing point of the liquid. That antifreeze characteristic ensures the stream remains usable when temperatures drop. The other types involve different formulations or mechanisms (foam relies on foam concentrate, dry chemical uses powder, stored-pressure may be water-based but isn’t defined by an antifreeze salt in its standard description), so they don’t match the described feature.

This question tests knowledge of which water-based extinguisher uses a salt-containing solution to prevent the extinguishing agent from freezing. A loaded-stream extinguisher discharges a water-based solution, and in cold conditions it often contains an alkali metal salt to lower the freezing point of the liquid. That antifreeze characteristic ensures the stream remains usable when temperatures drop. The other types involve different formulations or mechanisms (foam relies on foam concentrate, dry chemical uses powder, stored-pressure may be water-based but isn’t defined by an antifreeze salt in its standard description), so they don’t match the described feature.