Chapter 1 - Fire Behavior

Question 1

Fire Dynamics is the study of how fire what?

Answer 1

Starts
Spreads
Develops

Scientific measurements and calculations.

Question 2

The way that fire reacts and behaves to its environments is what?

Answer 2

Fire behavior.

Question 3

In today’s structures, fire temperatures increase at what?

Answer 3

A faster rate.

Causing flash over sooner.

Question 4

Increasingly common in fires, Flash over occurs when?

Answer 4

Before the fire department has arrived.

Question 5

What is one of the keys in today’s fires?

Answer 5

Heat release rate rather than the temperature.

Question 6

Which direction does pressure move?

Answer 6

From high to low.

Question 7

When the pressure gradient is created what do we have?

Answer 7

Flow path.

Question 8

How do we reduce the temperatures and slow the combustion process?

Answer 8

Stop or control the air from being drawn into the fire.

Question 9

UEL is ____
LEL is ____

Answer 9

Rich

Lean

Question 10

Legacy fire development is related to what type of fires?

Answer 10

Fuel limited fires.

Question 11

The legacy fire isn’t limited by what?

Answer 11

Lack of oxygen.

Question 12

Modern fire development commonly relates to what type of fire?

Answer 12

Ventilation limited fires.

Question 13

What is a dangerous transition between the growth stage and fully developed stage?

Answer 13

Flashover (3)

Question 14

When modern fires become ventilation limited what happens?

Answer 14

The temperature decreases significantly. (5)

Question 15

What is a deflagation resulting from the sudden introduction of air into a confined space containing oxygen deficient products of incomplete combustion (smoke explosion?)

Answer 15

Backdraft (5)

Question 16

What type of backdrafts are the cause of many firefighter injuries?

Answer 16

Backdrafts that most commonly occur in attic spaces, knee walls, or any other void space. (5)

Question 17

If a small opening is made water should be applied where?

Answer 17

To the smoke and into the compartment. (6)

Question 18

What is the space through which fire, heat, and smoke progress, moving from high pressure fire area towards lower pressure oxygen sources?

Answer 18

Flow path (6)

Question 19

What is critical on the fire ground?

Answer 19

Controlling the ventilation openings. (6)

Question 20

What is one of the most underutilized skills for firefighters?

Answer 20

Recognizing fire behavior as it changes and reacts to our tactics. (6)

Question 21

What should recognize imminent failure to a window or door?

Answer 21

A solid size up (6)

Question 22

The time between tactical ventilation and flashover could be as little as?

Answer 22

2 min. (6)

Question 23

What three things does interrupting the flow path do?

Answer 23

Reduce heat within the structure

Minimize the potential for flashover.

Greatly enhanced the safety for firefighters.

(6)

Question 24

What is the time between tactical ventilation and flashover in a traditional fire?

Answer 24

8 min. (6)

Question 25

Increasing ventilation in a ventilation limited structure may lead to what?

Answer 25

Rapid transition to flash over. (7)

Question 26

What causes fire spread?

Answer 26

Smoke and fire gases. (7)

Question 27

What are essential components to understanding fire behavior? (4)

Answer 27

Smoke volume
Velocity
Density
Color
(7)

Question 28

What is vital to stopping smoke and fire spread if the fire has not been controlled with water?

Answer 28

Controlling the ventilation openings (7)

Question 29

What often precedes combustion?

Answer 29

Pyrolysis (9)