Firefighter Fire Behavior and Suppression 3 — Questions and Answers
Question 1: The stage of a compartment fire where almost all combustible surfaces ignite simultaneously is called:
- Incipient stage
- Flashover (Correct answer)
- Decay stage
- Smoldering
Correct answer: Flashover
Flashover is the transition where all exposed combustible surfaces in a room ignite nearly simultaneously.
Question 2: Pyrolysis is best defined as:
- The cooling of fuel by water
- Chemical decomposition of a material by heat (Correct answer)
- The mixing of fuel and oxygen
- Combustion of metals
Correct answer: Chemical decomposition of a material by heat
Pyrolysis is the thermal decomposition of a material, releasing flammable gases before ignition.
Question 3: Which firefighting tactic involves applying water to the exterior before entering, to reset interior conditions?
- Indirect attack
- Transitional attack (Correct answer)
- Combination attack
- Direct attack
Correct answer: Transitional attack
A transitional attack uses a quick exterior application to cool and reset before transitioning to interior operations.
Question 4: What is the ignition temperature of a fuel?
- Temperature at which it produces vapors
- Lowest temperature at which it will ignite and sustain combustion (Correct answer)
- Temperature of the visible flame
- Temperature at which it melts
Correct answer: Lowest temperature at which it will ignite and sustain combustion
Ignition temperature is the minimum temperature at which a fuel will ignite and continue to burn.
Question 5: Heat transferred by electromagnetic waves that can ignite exposures across a gap is called:
- Conduction
- Convection
- Radiation (Correct answer)
- Diffusion
Correct answer: Radiation
Radiation transfers heat through electromagnetic waves and can ignite nearby exposures without contact.
Question 6: Class B fires involve which type of fuel?
- Ordinary combustibles
- Flammable liquids and gases (Correct answer)
- Energized electrical equipment
- Cooking oils only
Correct answer: Flammable liquids and gases
Class B fires involve flammable and combustible liquids and gases such as gasoline and propane.
Question 7: Proper ventilation during interior firefighting primarily helps by:
- Adding fuel to the fire
- Releasing heat and smoke to improve conditions (Correct answer)
- Increasing the chance of backdraft
- Cooling the water supply
Correct answer: Releasing heat and smoke to improve conditions
Coordinated ventilation releases heat and smoke, improving visibility and survivability when timed with suppression.
Firefighter Fire Behavior and Suppression 3
The stage of a compartment fire where almost all combustible surfaces ignite simultaneously is called: