MFRI Firefighter I Practice Test 2025 – All-in-One Guide to Master Your Firefighting Certification!

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What mechanism do CO2 extinguishers use to extinguish fire?

They absorb heat from the fire

They displace oxygen to smother the flames

CO2 extinguishers effectively extinguish fires primarily by displacing oxygen, which is essential for combustion. When the carbon dioxide is released, it creates a cloud that envelops the flames and reduces the concentration of oxygen around the fire. Since fires require oxygen to sustain combustion, this displacement effectively smothers the flames.

The mechanism of action of a CO2 extinguisher is particularly useful for fires that involve flammable liquids and electrical equipment, as it does not leave any residue and does not conduct electricity. This makes it an ideal choice for use in environments where other agents might cause damage or create additional hazards.

Understanding this mechanism is crucial for effective fire suppression tactics and helps ensure safety and effectiveness during fire incidents.

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They release water vapor to cool the fire

They create a chemical barrier to interrupt combustion

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