Block 6 Firefighting Fundamentals

Question 1

What is the fire fighters primary and secondary duty?

Answer 1

Primary- Save lives

Secondary- extinguish fires and limit damage

Question 2

What are the key components of a fire triangle?

Answer 2

Heat, fuel, and oxygen

Question 3

What is a fire tetrahedron?

Answer 3

Same as triangle except you add a chemical chain reaction.

Question 4

Class Alpha Fires

Answer 4

Occur in combustible materials that produce ash such as burning wood. Extinguishing agents are water or Aqueous Film Forming Foam (AFFF)

Question 5

Class Bravo Fire

Answer 5

Flammable liquid substances such as gasoline. Extinguishing agents are AFFF, Halon 1211, Purple K powder (PKP) and Carbon Dioxide (CO2)

Question 6

Class Charlie Fire

Answer 6

Are energized electrical fires that are attacked by using non conductive agents.
Energized: CO2, Halon, PKP, H20 in a fog pattern with 4 ft distance
De-energized: Treat as A,B, D fire

Question 7

Class Delta Fire

Answer 7

Combustible metals such as magnesium and titanium.

Extinguishing agent: H2O in large quantities in high velocity fog.

Question 8

Aqueous Film Forming Foam (AFFF)

Answer 8

3% and 6% AFFF concentrate is approved for naval use. Current shipboard equipment requires 6% concentrate.

Question 9

Water (H20)

Answer 9

Cools aircraft and provides a heat shield.

Question 10

Halon 1211 (Bromochlorodifluoromethane)

Answer 10

Intended primarily for use on Class B and C fires but can be effective on A. It’s a colorless, faintly sweet smelling, electrically non conductive gas that leaves no residue. Inhibits chemical chain reaction

Question 11

Carbon Dioxide (CO2) 15lb and 50lb portable units

Answer 11

Primarily for B and C fires.
A colorless oderless gas that is 1.5 times heavier than air.
Displaces oxygen

Question 12

Potassium Bicarbonate (Purple K Powder or PKP)

Answer 12

Primarily for B fires
Breaks down combustion chain
Does not cool, can reflash