Portable Fire Extinguisher Ch. 7 Question and answer already passed 2023

Portable Fire Extinguisher Ch. 7 Question and answer already passed 2023NFPA 10 Standard for portable fire extinguishers Class A fire Involves ordinary combustibles such as textiles, paper, plastics, rubber, and wood. Extinguished easier with: water, water-based agents such as Class A foam or dry chemicals Dry Chemical Extinguishing system that uses dry chemical as the primary extinguishing agent; often used to protect areas containing volatile flammable liquids. USED ON CLASS A, B, C FIRES Class B fire Involves flammable and combustible liquids and gases, such as alcohol, gasoline, lubricating oils, and liquefied petroleum gas (LPG). Extinguish: carbon dioxide (CO2), dry chemical, and Class B foam. Class C fire Involve energized electrical equipment. Water and water based agents CANNOT be used on class C fires UNTIL the electrical energy has been eliminated. Class C extinguishing agents no not conduct electricity making them suitable for electrical fires. Once the power supply has been turned off or disconnected, the fire can be treated as a Class A or B fire. Class D fire Involving combustible alloys such as lithium, magnesium, potassium and sodium. Some common magnesium use are in car wheels and transmission components and even some metal box springs in beds. These can be identified by the bright light emissions during the combustion process. The use of water basd agents on Class D fires will cause the fire to react violently, emit bit of molten metal. Extinguish using Class D DRY POWDER extinguisher. Dry Powder Extinguishing agent suitable for use on combustible metal fires. Class K fire Involve combustible cooking oils such as vegetable or animal fats and oils that burn at extremely high temperatures. Extinguish with wet chemical systems.