F80 Fire Behavior and Combustion Principles 3

Question 1

Class K fires involve which type of fuel?

Accepted Answer

Cooking oils and animal fats at high temperatures

Answer

Electrical equipment and energized circuits

Answer

Combustible and reactive metals

Answer

Ordinary combustibles such as wood and paper

Question 2

Which heat transfer method involves direct physical contact between two materials?

Accepted Answer

Conduction

Answer

Convection

Answer

Radiation

Answer

Combustion transfer

Question 3

What stage of fire development is characterized by diminishing flames and reduced intensity as fuel is consumed?

Accepted Answer

Decay stage

Answer

Incipient stage

Answer

Free-burning stage

Answer

Flashover transition

Question 4

What is the flash point of a flammable liquid?

Accepted Answer

The lowest temperature at which it produces enough vapor to flash briefly when an ignition source is applied

Answer

The temperature at which it spontaneously ignites without a spark

Answer

The temperature at which it begins to boil

Answer

The point at which it transitions from liquid to solid state

Question 5

What type of smoke color typically indicates incomplete combustion in a petroleum-based fuel fire?

Accepted Answer

Black or dark gray smoke with unburned carbon particles

Answer

White smoke from steam and water vapor

Answer

Clear colorless vapor

Answer

Pale gray smoke from water suppression

Question 6

What is the term for the minimum temperature at which a liquid produces vapor fast enough to sustain continuous burning (not just flash)?

Accepted Answer

Fire point

Answer

Flash point

Answer

Autoignition temperature

Answer

Lower explosive limit temperature