Question

Potassium bicarbonate powder is used as a Dry Chemical Powder fire extinguishing media for
1. Solid
2. Metal
3. Gaseous
4. Liquid

Answer 1

Correct Answer - Option 4 : Liquid

Explanation:

Dry Chemical Extinguishers

• Dry Chemical expels a finely powdered dry chemical which, on striking flame, releases many time its volume in nontoxic fire Extinguishing gases similar to CO₂.
• The powder consists principally of bicarbonate of soda which has been chemically processed to make it free-flowing.
• The extinguishers contain a cartridge of CO₂ or nitrogen to expel the dry chemicals.
• These extinguishers can be used for electrical fires, both in rotating machinery and other equipment, since the powder is non-conducting and, in some types, non-abrasive.
• However, the power remaining after the fire is extinguished is difficult to clean from motor or generator windings.
• These extinguishers are effective on fires of flammable liquids in vats and pools, spilled fires on floors, or in any situation where the compound stream can be swept across the burning surface.