Chpt 14 Flashcards Preview

Fire Appartus Driver Operator > Chpt 14 > Flashcards

Flashcards in Chpt 14 Deck (125)
Loading flashcards...
1

The national institute of standards and technology has determined that foam is ______ more effective than plain water in extinguishing fires, which can justify its use and added expense at an incident site

Three to five times

2

Is a device that mixes the foam concentrate into the fire stream in the proper percentage

Foam proportioner

3

The expansion of foam solution depends on good mechanical agitation and effective ______, the process of introducing air into the foam solution

Aeration

4

Foam tetrahedron includes four components

Water
Foam concentrate
Air
Mechanical agitation

5

Are produced when water and foam concentrate are mixed in the appropriate amounts

Mechanical foams

6

Hydrocarbon fuels, such as gasoline, jet fuel, and kerosene, have a lower _______ than water

Surface tension

7

Comprises the time required for a foam blanket to spread out across a fuel surface

Knockdown and speed flow

8

Are used on ordinary combustible materials such as wood, textiles, and paper; they are also effective on organic materials such as straw and hay.

Class A

9

Class A foams sometimes referred to as ______, are very effective because they improve the penetrating effect of water and allow for great heat absorption

Wetting agents

10

According to foam manufacturers, these wetting agents can extinguish fie involving class A materials as much as _____ faster than water

20 times

11

Is particularly useful for protecting buildings in rural areas during forest and brush fires when the water supply is limited

Class A foam

12

Many fire departments use ____ while performing initial attack and overhaul of fires

Class A foam

13

Class A foam increases the effectiveness of the water as an extinguishing agent by reducing the _____ of the water

Surface tension

14

Are used on hydrocarbon, combustible fuels, or polar solvent fires

Class B foams

15

A _____ reduces the surface tension of water and enhances penetration into fuel that is burning

Wetting agent

16

A ____ creates a stable mass of small, air filled bubbles with lower density than oil, gas, or water and will float on top of burning fuel, creating a blanket that separates the fuel from air, lowering the Temperature and suppressing the vapors

Foam

17

Are used to extinguish class B fires involving hydrocarbons

Protein foams

18

Contain naturally occurring proteins that is, animal by product as the foaming agent.

Protein foams

19

They produce highly stabilized mechanical foam with good expansion properties, excellent heat, and ______ and good drainage characteristics

Burn back resistance

20

Consists of hydrolyzed protein, stabilizers, preservatives, and synthetic fluorocarbon surfactants

Fluoroprotein foam

21

This type of foam is used for hydrocarbon vapor suppression and extinguishment of fuel in depth fires

Fluoroprotein foam

22

Have slower knockdown characteristics than other concentrates, but they provide a long lasting foam blanket after the fire is extinguished

Regular protein foams

23

Because they must be properly aspirated, these foams should not be used with non aspirating structural fog nozzles

Fluoroprotein foams

24

Is able to form a vapor sealing film on non polar solvents

Film forming fluoroprotein foam

25

Knockdown performance is improved because the foam releases an aqueous film on the surface of the hydrocarbon fuel

Film forming fluoroprotein foams

26

Can be used on both hydrocarbon and water soluble fuels

Alcohol resistant film forming fluoroprotein foam

27

AR-FFFP is basically FFFP with a _______ additive

Polysaccharide polymer additive

28

Is based on combination of flurochemical surfactants, hydrocarbon surfactants, mad solvents

AFFF aqueous film forming foam

29

Because of the versatility of ____; it is used by the majority of municipal and airport fire departments in North America

AFFF

30

It’s ability to flow quickly allows _____ to achieve a very fast knockdown of hydrocarbon fuels

AFFF