Ch. 5 - Fire Behavior

Question 1

Chemical reaction that gives off heat

Answer 1

exothermic

Question 2

Chemical reaction that absorbs heat

Answer 2

endothermic

Question 3

Conditions needed for fire

Answer 3

oxygen-fuel-heat

Question 4

Pyrolysis

Answer 4

process that liberates flammable vapors from a fuel source

Question 5

Conduction

Answer 5

process of transferring heat between two solids

Question 6

Convection

Answer 6

transfer of heat by the flow of gas or liquid from hotter areas to cooler areas

Question 7

Radiation

Answer 7

transfer of heat through the emission of energy

Question 8

Class A Fire

Answer 8

ordinary solid combustible materials

Question 9

Class B Fire

Answer 9

flammable or combustible liquids

Question 10

Combustible material

Answer 10

a material that can combust when heated

Question 11

Flammable material

Answer 11

a material that will combust immediately on exposure to heat

Question 12

Class C Fire

Answer 12

energized electrical equipment

Question 13

Class D Fire

Answer 13

combustible metals

Question 14

Class K Fire

Answer 14

cooking oils and fat

Question 15

HRR

Answer 15

Heat release rate; rate at which heat energy is generated

Question 16

Thermal layering

Answer 16

process by which hot gases rise to the top

Question 17

Neutral Plane

Answer 17

boundary between hot and cool gases

Question 18

Rollover

Answer 18

spontaneous ignition of hot gases in the upper levels of a room; also known as flameover

Question 19

Flashover

Answer 19

when all exposed surfaces have ignited

Question 20

What is the critical temperature when flashover can occur?

Answer 20

1000F

Question 21

Backdraft

Answer 21

occurs when oxygen is introduced to a ventilation-limited fire

Question 22

Stages of Fire Development

Answer 22

1. Incipient Stage
2. Growth Stage
3. Fully Developed
4. Decay Stage

Question 23

Volitility

Answer 23

amount of liquid that vaporizes

Question 24

Flammable range

Answer 24

range in concentration between upper and lower flammable limits

Question 25

lower explosive limit

Answer 25

minimum amount of gaseous fuel that must be present for the mixture to be flammable

Question 26

BLEVE

Answer 26

boiling liquid/expanding vapor explosion

Question 27

turbulent smoke flow

Answer 27

“boiling” smoke caused by absorbing radiant heat

Question 28

Black fire

Answer 28

extremely hot and dense smoke

Question 29

laminar smoke flow

Answer 29

smooth or streamlined flow

Question 30

Minimum temperature at which a fuel will ignite when heated

Answer 30

ignition temperature

Question 31

As electricity flows through a wire what relationship is there between the resistance of the wire and the heat produced?

Answer 31

Greater resistance = more heat

Question 32

What is vapor density?

Answer 32

measures the weight of a gas fuel compared to air

Question 33

what is the vapor density of gasoline?

Answer 33

varies widely

Question 34

What occurs when a mixture of flammable gas and oxygen in a void or other confined area come in contact with an ignition source?

Answer 34

smoke explosion

Question 35

What occurs when liquid fuel in a pressurized container is heated to fuel’s boiling point?

Answer 35

BLEVE - Boiling Liquid Expanding Vapor Explosion