Chapter 23 Advanced Fire Suppression Flashcards
Class A foams are formulated to be mixed with water in ratios from
0.1 to 1.0 %
Class B foam is used for which type of fire
Flammable liquids
How is foam proportioned in most portable extinguishers
Premixing
Medium-expansion foam creates a maximum expansion ratio of ___ to 1
200
To batch mix 3% foam into a 500 gallon booster tank, you would need to add _____ of foam concentrate to the tank
15 gal
Which is a benefit of Class A foam
Reduces the surface tension of water
Which is an advantage of compressed air foam
Adheres to most surfaces
Which is an attribute of a “wet” Class A foam
Improved fuel penetrating properties
Which type of foam is made from animal by-products
Protein
Which type of foam proportioner relies on the Venturi effect
Eductor
A combination fire attack begins with
An indirect attack
From the exterior, a crew directs a hose stream through the window of a burning room. This is an____ attack
Indirect
The low surface tension of Class A foam affects its extinguishing properties by
Enabling water to penetrate the fuel more deeply
What is a BLEVE
Flammable liquid vessel rupture and explosion due to external heating
What is a high high-expansion foam usually used for
Flooding of large enclosed areas
