Fire Safety Fire Behavior and Combustion Science

Question 1

What three elements make up the fire triangle?

Accepted Answer

Fuel, oxygen, and heat

Answer

Fuel, nitrogen, and ignition

Answer

Carbon, oxygen, and spark

Answer

Heat, pressure, and combustion

Question 2

Which class of fire involves ordinary combustibles such as wood, paper, and cloth?

Accepted Answer

Class A

Answer

Class B

Answer

Class C

Answer

Class D

Question 3

What is the autoignition temperature of a material?

Accepted Answer

The minimum temperature at which it will ignite without any external ignition source

Answer

The temperature at which it melts and releases gases

Answer

The temperature at which its vapors ignite with a spark

Answer

The temperature at which a fire extinguisher becomes ineffective

Question 4

What is flashover in the context of fire development?

Accepted Answer

The sudden, simultaneous ignition of all combustible materials in a room

Answer

When fire moves from one room to another through a doorway

Answer

When a fire's fuel supply is completely exhausted

Answer

The point at which a sprinkler system activates

Question 5

Which combustion gas is responsible for the majority of fire-related fatalities in the United States?

Accepted Answer

Carbon monoxide (CO)

Answer

Carbon dioxide (CO2)

Answer

Hydrogen cyanide

Answer

Nitrogen dioxide

Question 6

How does the 'fire tetrahedron' differ from the older 'fire triangle' model?

Accepted Answer

It adds the uninhibited chemical chain reaction as a fourth element

Answer

It adds pressure as a fourth element

Answer

It replaces heat with radiation

Answer

It includes smoke as a fourth required element

Question 7

Which class of fire involves flammable liquids such as gasoline and oil?

Accepted Answer

Class B

Answer

Class A

Answer

Class C

Answer

Class K