CFM Fire Behavior & Combustion Principles 2

Question 1

What does the term 'fuel load' refer to in fire science?

Accepted Answer

The weight of combustible materials per unit area in a given space

Answer

Fuel load refers to the total quantity of combustible materials per unit area in a given space, typically expressed in BTUs or pounds per square foot.

Question 2

Which mechanism of fire spread involves the movement of hot gases and smoke carrying heat to unburned areas?

Accepted Answer

Convection

Answer

Convection spreads fire through the movement of hot gases and smoke, which rise and carry heat energy to adjacent unburned areas above and around the fire.

Question 3

Backdraft occurs when a fire in an oxygen-limited environment suddenly:

Accepted Answer

Receives a sudden influx of oxygen

Answer

Backdraft occurs when a smoldering, oxygen-starved fire receives a sudden fresh supply of oxygen — such as when a door is opened — causing rapid, explosive combustion.

Question 4

The rate of heat release (HRR) from a burning material is most commonly expressed in:

Accepted Answer

BTUs per hour or kilowatts (kW)

Answer

Heat release rate (HRR) measures the power output of a fire and is expressed in BTUs per hour or kilowatts (kW), indicating how quickly energy is being released.

Question 5

Smoldering combustion is best characterized by which of the following?

Accepted Answer

Burning at the fuel surface without producing a visible flame

Answer

Smoldering (glowing) combustion occurs when a material burns without producing a visible flame, typically at the fuel surface, and can persist for extended periods.

CFM - Certified Fire Marshal Practice Test

CFM - Certified Fire Marshal Practice Test

CFM Fire Behavior & Combustion Principles 2