Question

select the best choice for the following statement.
multi - purpose or dry chemical extinguishers:
a) can be used on class a, b and c fires
b) use nitrogen to dispel fire - retardant powder.
c) halt interactions between fuel and oxygen
d) all of the above

Explanation:

• Option a: Multi - purpose dry chemical extinguishers are designed to handle Class A (ordinary combustibles like wood, paper), Class B (flammable liquids like gasoline), and Class C (energized electrical equipment) fires.
• Option b: They use nitrogen as a propellant to dispel the fire - retardant powder (e.g., monoammonium phosphate).
• Option c: The powder in dry chemical extinguishers coats the fuel, interrupting the chemical reaction between fuel and oxygen (a key part of the fire triangle: fuel, oxygen, heat).

Since all of the statements (a, b, and c) are correct about multi - purpose or dry chemical extinguishers.

Answer:

d) All of the above