Question 12 of 30
Which statement describes the primary process by which fires are extinguished by dry chemical?
A
The dry chemical creates a dense visual foam overlay block
B
The dry chemical powder attacks the fuel and oxygen chain reaction
C
The active agent drops fuel core parameters past absolute freezing margins
D
It relies on heavy moisture transformation into structural vapor screens
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Answer & Explanation
The correct answer is Option B: The dry chemical powder attacks the fuel and oxygen chain reaction.
Dry chemical powders primarily extinguish fires by interrupting the chemical chain reaction of combustion. They also have a slight cooling effect and can form a barrier between the fuel and oxygen.