Chapter 14 Foam

Question 1

Mechanical foams are the most common in use. The foam must have 3 things done to work, they are:

Answer 1

Proportioned mixed with water
Aerated mixed with air
Educted

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Question 2

Foam concentrate

Answer 2

Raw foam liquid in its storage container before being combine with water and air

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Question 3

Foam proportioner

Answer 3

Deice that injects the correct amount of foam concentrate in to the water stream to make the foam solution

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Question 4

Foam solution

Answer 4

Mixture of foam concentrate and water before the intoduction of air

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Question 5

Foam

Answer 5

Completed product after air is introduced into the foam solution

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Question 6

Class b fuels are divided into two categories

Answer 6

Hydrocarbons and
Polar solvents

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Question 7

Hydrocarbon fuels such as crude oil, fuel oil are petroleum based and have a specific gravity of:

Answer 7

Less then one. They float on water

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Question 8

Class b is effective on hydrocarbon fuel fires because:

Answer 8

It floats on the surface and suppresses the vapors

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Question 9

Polar solvents include: alcohol, acetone, ketones, esters. They are miscible which. Means they:

Answer 9

Mix with water. Class B foam is not effective with them

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Question 10

Foam extinguishes or suppresses vapors by the following methods:

Answer 10

Separating Creating a barrier

Cooling: lowering the temp

Suppressing or smothering: prevents the release of flammable vapors reducing the possibility of ignition or reignition
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