chapter 8

Question 1

Water

Answer 1

is the most prevalent extinguishing agent in use

Question 2

At 212F water expands

Answer 2

1700 times it original volume

Question 3

Water extinguishes fire through 3 basic methods

Answer 3

1. Cools the burning material
2. Smothers the fire
3. Separates the fuel from the heat

Question 4

Cooling

Answer 4

Remains the main reason water extinguishes fire

Question 5

NFA formula:

Answer 5

NFF= L x W/3 x percentage of involvement

3 is the constant and never changes

Question 6

Iowa Formula

Answer 6

NFF=V/100
V= volume, found by multiplying L x W x H
100 is constant and never changes

Question 7

An effective fire stream is defined as

Answer 7

the stream that meets its objective

Question 8

The most widely used nozzle in the fire service today isthe

Answer 8

fog nozzle

Question 9

The more droplets of water there are, the greater the

Answer 9

surface area, meaning more heat is absorbed

Question 10

One of the best benefits of a smooth bore nozzles is

Answer 10

that it creates a stream that does not generally disturb the thermal layers of the fire or push the heat and gasses into other areas, which can result in better survivability for occupants

Question 11

3 steps used to figure pump discharge pressure needed

Answer 11

1. calculate the constants
2. Calculate additional pressure needed due to elevation
3. calculate friction loss

Question 12

Hydrocarbons are

Answer 12

Pertroleum based
gasoline
Benzene
Toulene

Question 13

Polar Solvents are

Answer 13

common alcohol based
ethanols
ketones
lacquer thinner
some acids

Question 14

There are 4 components of foam

Answer 14

water
foam
air
agitation

Question 15

Class A foams

Answer 15

designed for Class A combustibles
Makes water wetter
Breaks down surface tension
referred to as " Wetting Agent"
Very low proportion rate usually 1% or less

Question 16

Dry chemical

Answer 16

is generally used on flammable liquid fires such as grease and gasoline, and is very common in fire extinguisher and hood systems

Question 17

Multipurpose extinguishers are

Answer 17

A-B-C

Question 18

Ordinary purpose extinguishers are

Answer 18

B-C

Question 19

Dry chemical extinguish Class B-C fires by

Answer 19

interrupting the chemical chain reactions

Question 20

Dry chemical extinguish Class A fires

Answer 20

they coat the material burning and extinguish the fire through smothering

Question 21

Dry powders are

Answer 21

Special purpose extinguishing agents used for Metals and class D fires

Question 22

Carbon dioxide extinguishment is accomplished

Answer 22

when gas discharged from the extinguisher smother the fire

Question 23

Halon 1201

Answer 23

bromochlorodifluoromethane, liquid form of halon

Question 24

Halon 1301

Answer 24

bromotrifluoromethane, a gases form.