AFF Exit Exam • Set 7 Question 11 of 30
Which statement describes the primary process by which fires are extinguished by dry chemical?
✓
Direct Answer
Option D: 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.
All Options
A
The active agent drops fuel core parameters past absolute freezing margins
B
The dry chemical creates a dense visual foam overlay block
C
It relies on heavy moisture transformation into structural vapor screens
D
The dry chemical powder attacks the fuel and oxygen chain reaction
(Correct Answer)
Detailed Explanation & Context
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.
Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • Advanced Fire Fighting (AFF).
Advertisement
Practice Full AFF Set 7
Test yourself with 30 interactive questions, live timer, and instant score.