FE Fire Extinguisher Types & Classification

Question 1

Which of the following is the correct classification for a fire extinguisher used on electrical fires?

Accepted Answer

Class C

Answer

Class C fires involve energized electrical equipment. Class C fire extinguishers are specifically designed to be non-conductive, meaning they will not transmit electricity. This makes them safe and effective for extinguishing electrical fires without posing a risk of electrocution to the user.

Question 2

What type of fire extinguisher is most suitable for fires involving flammable liquids?

Accepted Answer

Class B

Answer

Class B fires involve flammable liquids such as gasoline, oil, or grease. Class B fire extinguishers are formulated to smother these types of fires by cutting off the oxygen supply or inhibiting the chemical chain reaction. This prevents the fire from reigniting and effectively extinguishes it.

Question 3

Which of the following extinguishing agents is commonly used in Class D fire extinguishers?

Accepted Answer

Dry Powder

Answer

Class D fires involve combustible metals like magnesium, titanium, or sodium, which burn at extremely high temperatures. These fires require specialized dry powder agents that work by smothering the fire and absorbing heat. Using water or other common extinguishing agents can react violently with burning metals, making the fire worse.

Question 4

What type of fire extinguisher is best suited for a wood or paper fire?

Accepted Answer

Class A

Answer

Class A fires involve ordinary combustible materials such as wood, paper, cloth, and trash. Class A fire extinguishers typically use water or water-based agents to cool the fuel below its ignition temperature. This method effectively removes the heat element from the fire triangle, extinguishing the blaze.

Question 5

Which of the following best describes the use of a CO2 fire extinguisher?

Accepted Answer

For electrical and liquid fires

Answer

CO2 (carbon dioxide) fire extinguishers are highly effective on Class B fires (flammable liquids) and Class C fires (electrical equipment). They work by displacing oxygen around the fire and cooling the fuel, interrupting the combustion process. Their non-conductive nature makes them safe for use on electrical fires without damaging sensitive equipment.

(FE) Certified Portable Fire Extinguisher Technician Practice Test

(FE) Certified Portable Fire Extinguisher Technician Practice Test

FE Fire Extinguisher Types & Classification