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AFF Exit Exam • Set 4 Question 28 of 30

What is NOT a characteristic of a carbon dioxide fire extinguishing agent?

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Direct Answer

Option C: It is effective even if ventilation is not shut down

Carbon dioxide (CO2) extinguishers displace oxygen to smother a fire, and as they discharge, the rapid expansion of gas causes extreme cooling, potentially leading to frostbite. However, CO2 is electrically conductive and must not be used on live electrical equipment if safer alternatives exist, and ventilation is crucial after use to clear the oxygen-deficient atmosphere.

All Options

A
It leaves no messy residue after use
B
It displaces air to smother a fire
C
It is effective even if ventilation is not shut down (Correct Answer)
D
It can cause frostbite upon contact with skin

Detailed Explanation & Context

Carbon dioxide (CO2) extinguishers displace oxygen to smother a fire, and as they discharge, the rapid expansion of gas causes extreme cooling, potentially leading to frostbite. However, CO2 is electrically conductive and must not be used on live electrical equipment if safer alternatives exist, and ventilation is crucial after use to clear the oxygen-deficient atmosphere.

Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • Advanced Fire Fighting (AFF).

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