Question

When applied to solid fuels, Class A foam blankets the fuel, controls flames, then:

A. changes the pH of the water.
B. expands at a ratio of 20-to-1.
C. dissipates into the air, leaving no residue.
D. breaks down, releasing water to cool the fuel.

Answer 1

When applied to solid fuels, Class A foam blankets the fuel, controls flames, then breaks down, releasing water to cool the fuel. (Option D).

Step-by-step explanation:

When applied to solid fuels, Class A foam blankets the fuel, controls flames, then:

1. changes the pH of the water.
2. expands at a ratio of 20-to-1.
3. dissipates into the air, leaving no residue.
4. breaks down, releasing water to cool the fuel.

The correct answer is option D. Class A foam is designed to create a blanket over the fuel, smothering the flames and preventing oxygen from reaching the fuel. It breaks down over time, releasing water which helps to cool down the fuel and prevent re-ignition.