S-290 Intermediate Wildland
Fire Behavior With Answers
Focus On Your Success
T/F
Both directly and indirectly, topography can impact fuels and their combustion availability.
True
Which is the least variable of the three environmental factors influencing fire behavior?
topography
What are the 3 Environmental Factors that influence Fire Behavior?
1) Weather
2) Topography
3) Fuels
This is the least important type of heat transfer that affects how quickly a wildland fire spreads.
Conduction
The temperature at which a flammable substance needs to be heated in order to ignite itself is
called the
Ignition temperature
What factors primarily affect fireline intensity?
Fuel size
Fuel moisture
Fuel temperature
Fuel compactness and arrangement
, ALL THE ABOVE
T/F
A well-developed convection column and wind are two prerequisites for long-range spotting.
True
A fire that advances through canopies of brush and trees is known as a
Crown fire
Occasionally, fire spreads from the litter on the ground into the individual tree crowns, producing
embers that ignite new fires beyond the fire perimeter.
Surface fire with torching and spotting
T/F
Upward-moving air contracts and warm
False
As air sinks it
Increases in pressure, warms and compresses
Wildland fires can be negatively impacted by Foehn winds because they can produce
Strong winds, warmer temperatures, and very low relative humidity
The process by which stable air is driven over a mountain range and then descends the leeward
slope heated, dry air is known as
A foehn Wind (look this up)
T/F
Bends in canyons are likely places for eddies to form
True
Fire Behavior With Answers
Focus On Your Success
T/F
Both directly and indirectly, topography can impact fuels and their combustion availability.
True
Which is the least variable of the three environmental factors influencing fire behavior?
topography
What are the 3 Environmental Factors that influence Fire Behavior?
1) Weather
2) Topography
3) Fuels
This is the least important type of heat transfer that affects how quickly a wildland fire spreads.
Conduction
The temperature at which a flammable substance needs to be heated in order to ignite itself is
called the
Ignition temperature
What factors primarily affect fireline intensity?
Fuel size
Fuel moisture
Fuel temperature
Fuel compactness and arrangement
, ALL THE ABOVE
T/F
A well-developed convection column and wind are two prerequisites for long-range spotting.
True
A fire that advances through canopies of brush and trees is known as a
Crown fire
Occasionally, fire spreads from the litter on the ground into the individual tree crowns, producing
embers that ignite new fires beyond the fire perimeter.
Surface fire with torching and spotting
T/F
Upward-moving air contracts and warm
False
As air sinks it
Increases in pressure, warms and compresses
Wildland fires can be negatively impacted by Foehn winds because they can produce
Strong winds, warmer temperatures, and very low relative humidity
The process by which stable air is driven over a mountain range and then descends the leeward
slope heated, dry air is known as
A foehn Wind (look this up)
T/F
Bends in canyons are likely places for eddies to form
True
