Fire Safety Fire Extinguisher Types and Usage 3

Question 1

Which of the following extinguishing agents is most appropriate for a Class D metal fire?

Accepted Answer

Dry sand or dry powder specific to the metal

Answer

Class D fires involving combustible metals like magnesium require special dry powder agents formulated for that specific metal.

Question 2

After using a fire extinguisher partially, what should you do with it?

Accepted Answer

Have it recharged or replaced immediately

Answer

Even a partially discharged extinguisher must be recharged immediately because it may not have sufficient agent for the next emergency.

Question 3

What is the minimum height above the floor at which a fire extinguisher must be mounted if it weighs over 40 lbs?

Accepted Answer

3.5 feet

Answer

NFPA 10 requires extinguishers over 40 lbs to be mounted no higher than 3.5 feet to the top of the handle from the floor.

Question 4

Which fire class involves fires in cooking appliances using vegetable or animal oils?

Accepted Answer

Class F/K

Answer

Class K (US) or Class F (international) covers cooking oil and fat fires, which burn at much higher temperatures than ordinary flammable liquids.

Question 5

Why should you never use CO2 extinguishers in a confined space without proper ventilation?

Accepted Answer

CO2 displaces oxygen and can cause asphyxiation

Answer

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

Fire Safety Practice Test