Chapter 5 - Fire Behavior Part 1

True or false ? A physical change causes a change both chemically and in appearance

False

True or false ? All energy can change from one type to another

True

True or false ? In ambient temperatures (about 68�F [20�C]), materials can ignite at oxygen concentrations as low as 14 percent

True

The incipient stage is when the fire begins to influence the compartment environment

False

Which of the following is not actively part of the combustion reaction represented by the fire tetrahedron?

Passive agents

What is the most common source of heat in combustion reactions?

Chemical energy

Which of the following BEST describes how understanding heat transfer can help firefighters

It can help estimate the size of a fire before attack.

Sufficient heat during flaming combustion causes fuel and oxygen to form

free radicals and initiates a reaction.

What fire behavior is the result of an increase in low-level ventilation prior to upper level ventilation

Backdraft

Which of the following is the most commonly used fire-suppression method

Temperature reduction

What are the main differences between the two types of ignition

Piloted ignition is the most common type and occurs when a mixture of fuel and oxygen encounter an external heat source. Autoignition occurs without any external flame or spark

What are the three physical states of fuel

Gas, Liquid, Solid

What are five of the factors that affect fire development

Fuel type
Availability and location of additional fuel
Compartment volume and ceiling height
Ventilation
Thermal properties of the compartment
Ambient conditions
Fuel load

List the stages of fire development (not including rapid fire behavior).

Incipient stage, Growth stage, Fully developed stage, Decay stage