Fire Safety Fire Behavior and Combustion Science 2

Question 1

What is a backdraft?

Accepted Answer

An explosive ignition caused when fresh oxygen is suddenly introduced to a superheated, oxygen-depleted fire

Answer

Backdraft occurs when a smoldering, oxygen-deficient fire is suddenly supplied with fresh air — often by opening a door — triggering a rapid, explosive ignition.

Question 2

Which mechanism of heat transfer carries heat upward through the movement of hot gases and air?

Accepted Answer

Convection

Answer

Convection transfers heat through the physical movement of heated gases and air; hot gases rise due to buoyancy, spreading heat and fire to upper levels.

Question 3

What is the flashpoint of a flammable liquid?

Accepted Answer

The lowest temperature at which its vapors will ignite momentarily when exposed to an ignition source

Answer

Flashpoint is the lowest temperature at which a flammable liquid produces sufficient vapor to ignite briefly when exposed to an external ignition source.

Question 4

Which warning signs most strongly indicate a potential backdraft condition inside a structure?

Accepted Answer

Smoke being drawn inward, discolored (yellow/brown) windows, and little visible flame

Answer

Backdraft conditions are indicated by smoke being pulled back inside, stained windows from pyrolysis gases, and minimal visible flame — signs of a hot, oxygen-starved fire.

Question 5

Heat transfer through direct physical contact between materials is called:

Accepted Answer

Conduction

Answer

Conduction transfers heat through direct contact between materials, such as a metal structural beam conducting heat from a fire to an adjacent uninvolved room.

Fire Safety Practice Test

Fire Safety Practice Test

Fire Safety Fire Behavior and Combustion Science 2