S-190 Final Exam
Name two types of canyons that can result in extreme fire behavior.
Box Canyon Narrow Canyon
What are indicators to be aware of that can lead to increased fire behavior?
Cold Frontal passage Shifting winds Increases winds Erratic winds
What happens when oxygen is removed from the fire triangle?
Combustion cannot occur
As relative humidity decreases fuel moisture
Decreases
T or F? A north facing aspect will have more fire activity than a south facing aspect.
F
The vertical arrangement of ladder fuels describes what?
Fuels that link surface materials to the upper canopy.
Relative humidity is usually at its lowest in the:
Mid-afternoon
List dangerous conditions that can develop when a fire is burning in a steep narrow canyon?
Preheating Spotting Rolling material Increased rate of spread Wind influences
Fire burning without flame and barely spreading
Smoldering
Fire producing sparks or embers that are carried by wind or convection and starts new fires beyond the main fire.
Spotting
Hazards of a thunderstorm include:
Strong winds Lightning Erratic fire behavior
List weather factors which may produce rapid fire spread
Thunderstorms Frontal passage Fire whirls Dust devils Foehn Winds
What are the two types of horizontal arrangements of fuel?
Uniform Patchy
When is fire controlled?
When the fire is expected to hold under reasonable conditions.
What factor influences fire spread more than any other?
Wind
The moisture content of which type of fuel is most affected by change in relative humidity?
Grass
List the six basic fuel types:
Grass Grass-Shrub Shrub Timber-Litter Timber-Understory Slash-Blowdown
What are the three components of a fire triangle
Heat Fuel Oxygen
What are the three methods of heat transfer?
Radiation conduction Convection
List examples of a barrier:
Rock-Slide, River, Lake, Road, Fireline, Green Field, etc.
Fire spreading rapidly with a well defined head.
Running
List indicators that fire behavior is increasing
Torching Flare-ups Crowning Increased rate of spread Increase in spotting
