S- 190 WILDLAND FIRE BEHAVIOR EXAM 2024
QUESTIONS AND CORRECT ANSWERS WITH
COMPLETE SOLUTION.
is the primary weather element that affects fuel moisture content and the
resulting flammability of wildland fuels - ANSWERmoisture
1-hour fuels - ANSWER0-1/4 inch in diameter
10-hour fuels - ANSWER1/4-1 inch in diameter
100-hour fuels - ANSWER1-3 inch in diameter
1000-hour fuels - ANSWER3-8 inch in diameter
3 elements that must be present and combined before combustion can occur (fire
triangle) - ANSWERfuel to burn, air to supply oxygen to the flame, and heat to start and
continue the combustion process
remove any single one and there can be no fire
3 methods of heat transfer - ANSWERradiation, convection, conduction
a fire which starts near the bottom of a slope during normal upslope daytime wind
conditions will normally and has upslope than a fire that
starts near the top of the slope. - ANSWERspread faster, more area to spread
a north facing aspect will have than a south facing slope - ANSWERless
fire activity
aerial fuels - ANSWERall green and dead materials located in the upper canopy
include:
-tree branches and crowns
-snags
-hanging moss
air temperature varies with - ANSWERtime
,location
height above the earth's surface
anchor point - ANSWERan advantageous location, usually a barrier to fire spread, from
which to start constructing a fireline. the anchor point is used to minimize the chance of
being flanked by the fire while the line is being constructed
near something that won't burn ex. road side mowed field
, if no good anchor point, use a J hook
As the sun rises - ANSWERtemperature increases, relatively humidity decreases
aspect - ANSWERthe direction a slope is facing. (its exposure in relation of the sun)
atmospheric stability - ANSWERthe degree to which vertical motion in the atmosphere
is enhanced or suppressed.
backing fire - ANSWERthat portion of the fire with slower rates of fire spread and
lower intensity, normally moving into the wind and/or down slope. also called heel fire
barriers - ANSWERany obstruction to the spread of fire, typically an area or strip lacking
any flammable fuels
before a wet fuel can burn - ANSWERthe moisture it contains must evaporate,
smaller fuel will take on and lose moisture faster than heavier fuels
box canyons - ANSWERstart near base of box canyon; provide for rapid rates of fire
spread due to the channeling of wind and heat in upslope drafts chimney affect
chain - ANSWERunit of measure in land survey, equal to 66 feet (20 M)
(80 chains equal 1 mile). commonly used to report fire perimeters and other fireline
distances. popular in fire management because of its convenience in
calculating acreage (example: 10 square chains equal one acre)
changes in air temperature near the surface of the earth are caused by -
ANSWERchanging seasons
alternations of night and day
migrating weather systems
chinook wind: - ANSWERfound along the east side of the rockies and east side of the
sierra nevada
cold front - ANSWERthe boundary line between two different air masses, with cooler air
behind the front and warmer air ahead of the front.
QUESTIONS AND CORRECT ANSWERS WITH
COMPLETE SOLUTION.
is the primary weather element that affects fuel moisture content and the
resulting flammability of wildland fuels - ANSWERmoisture
1-hour fuels - ANSWER0-1/4 inch in diameter
10-hour fuels - ANSWER1/4-1 inch in diameter
100-hour fuels - ANSWER1-3 inch in diameter
1000-hour fuels - ANSWER3-8 inch in diameter
3 elements that must be present and combined before combustion can occur (fire
triangle) - ANSWERfuel to burn, air to supply oxygen to the flame, and heat to start and
continue the combustion process
remove any single one and there can be no fire
3 methods of heat transfer - ANSWERradiation, convection, conduction
a fire which starts near the bottom of a slope during normal upslope daytime wind
conditions will normally and has upslope than a fire that
starts near the top of the slope. - ANSWERspread faster, more area to spread
a north facing aspect will have than a south facing slope - ANSWERless
fire activity
aerial fuels - ANSWERall green and dead materials located in the upper canopy
include:
-tree branches and crowns
-snags
-hanging moss
air temperature varies with - ANSWERtime
,location
height above the earth's surface
anchor point - ANSWERan advantageous location, usually a barrier to fire spread, from
which to start constructing a fireline. the anchor point is used to minimize the chance of
being flanked by the fire while the line is being constructed
near something that won't burn ex. road side mowed field
, if no good anchor point, use a J hook
As the sun rises - ANSWERtemperature increases, relatively humidity decreases
aspect - ANSWERthe direction a slope is facing. (its exposure in relation of the sun)
atmospheric stability - ANSWERthe degree to which vertical motion in the atmosphere
is enhanced or suppressed.
backing fire - ANSWERthat portion of the fire with slower rates of fire spread and
lower intensity, normally moving into the wind and/or down slope. also called heel fire
barriers - ANSWERany obstruction to the spread of fire, typically an area or strip lacking
any flammable fuels
before a wet fuel can burn - ANSWERthe moisture it contains must evaporate,
smaller fuel will take on and lose moisture faster than heavier fuels
box canyons - ANSWERstart near base of box canyon; provide for rapid rates of fire
spread due to the channeling of wind and heat in upslope drafts chimney affect
chain - ANSWERunit of measure in land survey, equal to 66 feet (20 M)
(80 chains equal 1 mile). commonly used to report fire perimeters and other fireline
distances. popular in fire management because of its convenience in
calculating acreage (example: 10 square chains equal one acre)
changes in air temperature near the surface of the earth are caused by -
ANSWERchanging seasons
alternations of night and day
migrating weather systems
chinook wind: - ANSWERfound along the east side of the rockies and east side of the
sierra nevada
cold front - ANSWERthe boundary line between two different air masses, with cooler air
behind the front and warmer air ahead of the front.
