CPS Fire Behavior and Combustion 2

Question 1

What is the fourth element added to expand the fire triangle into the fire tetrahedron?

Accepted Answer

Uninhibited chain reaction

Answer

Carbon dioxide

Answer

Pressure

Answer

Ignition source

Question 2

What is pyrolysis?

Accepted Answer

The chemical decomposition of a material by heat, producing flammable gases

Answer

The process of extinguishing fire with water

Answer

The spread of fire through radiation alone

Answer

A method of controlled burning used in firefighting

Question 3

What is rollover (flameover) in a structure fire?

Accepted Answer

When flames roll across the ceiling through accumulated unburned gases ahead of the main fire

Answer

When a fire doubles in size within 60 seconds

Answer

When fire spreads from one floor to the next

Answer

When hose lines are overwhelmed by fire intensity

Question 4

Which fire class involves fires in flammable and combustible liquids and gases?

Accepted Answer

Class B

Answer

Class A

Answer

Class C

Answer

Class D

Question 5

What does the lower flammable limit (LFL) of a gas indicate?

Accepted Answer

The minimum concentration of gas in air required to sustain combustion

Answer

The minimum temperature at which a gas will self-ignite

Answer

The pressure at which a gas becomes explosive

Answer

The maximum safe storage temperature for flammable gas

Question 6

How does convection transfer heat in a fire environment?

Accepted Answer

Through the movement of heated gases and liquids carrying thermal energy

Answer

Through direct molecular contact between solids

Answer

Through electromagnetic waves requiring no medium

Answer

Through chemical reactions releasing energy

Question 7

What is thermal layering (thermal balance) in a burning structure?

Accepted Answer

The stratification of hot gases near the ceiling and cooler air near the floor

Answer

Equal heat distribution throughout a room

Answer

The process of heat sinking into concrete floors

Answer

A firefighting technique using water fog