F80 Fire Behavior and Combustion Principles 4

Question 1

What term describes the minimum temperature at which a liquid produces enough vapor to ignite momentarily when exposed to an open flame?

Accepted Answer

Flash point

Answer

The flash point is the lowest temperature at which a liquid produces sufficient vapor to flash momentarily when an ignition source is applied.

Question 2

During a backdraft event, what is the primary gas that fuels the explosive ignition when fresh air is introduced?

Accepted Answer

Carbon monoxide

Answer

Carbon monoxide accumulates in an oxygen-deficient fire environment and ignites explosively when fresh air (oxygen) is suddenly introduced, causing a backdraft.

Question 3

Which heat transfer method is primarily responsible for fire spreading across the underside of a ceiling in a room?

Accepted Answer

Convection

Answer

Convection carries hot gases and flames laterally across the ceiling, spreading fire to uninvolved areas of the room.

Question 4

What is the name of the phenomenon where unburned pyrolysis gases ignite simultaneously throughout a room, causing a sudden full-room fire?

Accepted Answer

Flashover

Answer

Flashover occurs when radiant heat causes all combustible surfaces in a compartment to reach their ignition temperature nearly simultaneously.

Question 5

Which component of the fire tetrahedron, if removed, is the basis for how dry chemical extinguishers work?

Accepted Answer

Chemical chain reaction

Answer

Dry chemical agents interrupt the chemical chain reaction of combustion, which is the fourth side of the fire tetrahedron beyond the classic triangle.

F80 Practice Test

F80 Practice Test

F80 Fire Behavior and Combustion Principles 4