Fire Safety Fire Extinguisher Types and Usage 5

Question 1

A CO2 extinguisher is used in a small enclosed room. What safety concern must users be aware of?

Accepted Answer

CO2 displaces oxygen and can cause asphyxiation

Answer

CO2 extinguishers displace oxygen in confined spaces, creating a risk of asphyxiation for anyone remaining in the area.

Question 2

What distinguishes a stored-pressure extinguisher from a cartridge-operated extinguisher?

Accepted Answer

Stored-pressure uses the same chamber for agent and propellant; cartridge-operated keeps them separate

Answer

In stored-pressure units, propellant and agent share one chamber, while cartridge-operated units store propellant in a separate cartridge that punctures upon activation.

Question 3

Which class of fire extinguisher is marked with a green triangle?

Accepted Answer

Class A

Answer

Class A extinguishers are identified by a green triangle symbol, indicating suitability for ordinary combustibles like wood, paper, and cloth.

Question 4

When using the PASS technique, what does the second 'S' stand for?

Accepted Answer

Sweep

Answer

In the PASS acronym (Pull, Aim, Squeeze, Sweep), the second S stands for Sweep — moving the nozzle side to side at the base of the fire.

Question 5

An extinguisher rated for Class D fires is needed when dealing with which type of burning material?

Accepted Answer

Combustible metals such as magnesium, titanium, or sodium

Answer

Class D extinguishers are specifically formulated for fires involving combustible metals, which require dry powder agents incompatible with water or standard dry chemicals.

Fire Safety Practice Test

Fire Safety Practice Test

Fire Safety Fire Extinguisher Types and Usage 5