CPS Fire Behavior and Combustion

Question 1

What are the three elements of the fire triangle?

Accepted Answer

Fuel, oxygen, and heat

Answer

Fuel, carbon dioxide, and pressure

Answer

Oxygen, water, and heat

Answer

Fuel, nitrogen, and ignition

Question 2

Which phase of combustion produces the visible flames seen during a structural fire?

Accepted Answer

Free-burning phase

Answer

Incipient phase

Answer

Smoldering phase

Answer

Flashover phase

Question 3

What is flashover in a structure fire?

Accepted Answer

The near-simultaneous ignition of all exposed combustible surfaces in a compartment

Answer

The moment a backdraft explosion occurs

Answer

When fire spreads through an HVAC system

Answer

The point at which sprinklers activate

Question 4

Which type of heat transfer occurs when heat moves through a material by direct molecular contact?

Accepted Answer

Conduction

Answer

Convection

Answer

Radiation

Answer

Pyrolysis

Question 5

At approximately what oxygen concentration (by volume) will most fires self-extinguish?

Accepted Answer

15%

Answer

18%

Answer

21%

Answer

10%

Question 6

Which fire class involves fires in ordinary combustible materials such as wood, paper, and cloth?

Accepted Answer

Class A

Answer

Class B

Answer

Class C

Answer

Class D

Question 7

What is backdraft?

Accepted Answer

An explosion caused by the sudden introduction of oxygen into an oxygen-depleted, superheated environment

Answer

A fire that burns downward through flooring

Answer

Flame spread driven by wind currents

Answer

Smoke traveling back through an exhaust duct