s-290 wildland questions with verified answers
3 firebrands effected by gravity Ans✓✓✓ pine cones, rocks, logs
3 ways convection spreads fire Ans✓✓✓ spotting, wind, direct flame contact,
surface to arial fuels
5 topographic factors that effect fire behavior Ans✓✓✓ elevation, aspect, slope,
shape, position of slope
5 whether factors that effect fire behavior Ans✓✓✓ Temperature, Relative
humidity, stability, wind, precipitation
6 primary fuel factors that effect ignition in a wild land fire Ans✓✓✓ moisture,
size and shape, arrangement,compactness, temperature
8 fuel factors that effect fire behavior Ans✓✓✓ fuel load
size and shape
compactness
horizontal continuity
vertical continuity
chemical content
fuel moisture
fuel temperature
a fuel model is defined as Ans✓✓✓ a mathematical representation that defines
the fuel input for use in the surface fire spread model
,a large plume spreads out in all directions at 10,00o feet above ground. This is an
indication of Ans✓✓✓ a subsidence inversion
a maritime polar air mass originates over Ans✓✓✓ cold oceanic regions such as
the north pacific, the gulf of alaska, and the north atlantic
a slope wind is caused by Ans✓✓✓ warm air rises and cold air settling
a smoke column that drifts apart after limited rise indicates Ans✓✓✓ a stable
atmosphere
adding water vapor to an air parcel will make it Ans✓✓✓ lighter
adiabatic laps rates are Ans✓✓✓ 5.5 degrees per 1000 ft dry 3.0 wet
after spinning the psychrometer for a minute you than Ans✓✓✓ continue
rotating and checking every 15 seconds until the lowest temperature is a achieved
air in a low pressure cell does what Ans✓✓✓ rises
air movement in a high pressure system Ans✓✓✓ sinking with winds clockwise
air movement in a low pressure system Ans✓✓✓ rising with winds
counterclockwise
,air pressure __________ approximately _______________ every 1000 ft of
elevation increase. Ans✓✓✓ decreases, 1 inch of mercury
all weather occurs in the Ans✓✓✓ troposphere
altocumulus castellanus clouds are Ans✓✓✓ formed with turrets and is an
indicator of very unstable air at middle levels of the troposphere
altocumulus floccus Ans✓✓✓ scattered tufts with rounded and slightly bulging
upper parts
altocumulus lenticularus Ans✓✓✓ stable air at middle level of the troposphere,
and it is often associated with gusty winds in the lee of mountain ranges
are foehn winds stable Ans✓✓✓ yes
are night temperatures warmer under timbers than a clearing ? Ans✓✓✓ true
are temps high on step slopes vs flat areas ? Ans✓✓✓ no flat areas are hotter
than slopes
as air parcel rises it Ans✓✓✓ expands
cools
becomes less dense
as air pressure decreases Ans✓✓✓ its volume will increase
, its density will decrease
its temperature will decrease
as air pressure increases Ans✓✓✓ its volume will decrease
it density will increase
and it temperature will increase
as air pressure increases Ans✓✓✓ temperature increases
volume decreases
as an air parcel sinks it Ans✓✓✓ compresses
warms
gets more dense
aspects affects fuels and their availability to burn by Ans✓✓✓ 1. southwest
slopes provide drier sites
2. Vegetation type and fuel moisture content changes by aspect
3. shading on northern aspects can increase relative humidity
available fuels are Ans✓✓✓ all dead and live fuels that will ignite and continue to
burn at a given time
average lapse rate Ans✓✓✓ 3.5F per 1000
average lapse rate for temperatures Ans✓✓✓ 3.5 degrees per 1000ft
3 firebrands effected by gravity Ans✓✓✓ pine cones, rocks, logs
3 ways convection spreads fire Ans✓✓✓ spotting, wind, direct flame contact,
surface to arial fuels
5 topographic factors that effect fire behavior Ans✓✓✓ elevation, aspect, slope,
shape, position of slope
5 whether factors that effect fire behavior Ans✓✓✓ Temperature, Relative
humidity, stability, wind, precipitation
6 primary fuel factors that effect ignition in a wild land fire Ans✓✓✓ moisture,
size and shape, arrangement,compactness, temperature
8 fuel factors that effect fire behavior Ans✓✓✓ fuel load
size and shape
compactness
horizontal continuity
vertical continuity
chemical content
fuel moisture
fuel temperature
a fuel model is defined as Ans✓✓✓ a mathematical representation that defines
the fuel input for use in the surface fire spread model
,a large plume spreads out in all directions at 10,00o feet above ground. This is an
indication of Ans✓✓✓ a subsidence inversion
a maritime polar air mass originates over Ans✓✓✓ cold oceanic regions such as
the north pacific, the gulf of alaska, and the north atlantic
a slope wind is caused by Ans✓✓✓ warm air rises and cold air settling
a smoke column that drifts apart after limited rise indicates Ans✓✓✓ a stable
atmosphere
adding water vapor to an air parcel will make it Ans✓✓✓ lighter
adiabatic laps rates are Ans✓✓✓ 5.5 degrees per 1000 ft dry 3.0 wet
after spinning the psychrometer for a minute you than Ans✓✓✓ continue
rotating and checking every 15 seconds until the lowest temperature is a achieved
air in a low pressure cell does what Ans✓✓✓ rises
air movement in a high pressure system Ans✓✓✓ sinking with winds clockwise
air movement in a low pressure system Ans✓✓✓ rising with winds
counterclockwise
,air pressure __________ approximately _______________ every 1000 ft of
elevation increase. Ans✓✓✓ decreases, 1 inch of mercury
all weather occurs in the Ans✓✓✓ troposphere
altocumulus castellanus clouds are Ans✓✓✓ formed with turrets and is an
indicator of very unstable air at middle levels of the troposphere
altocumulus floccus Ans✓✓✓ scattered tufts with rounded and slightly bulging
upper parts
altocumulus lenticularus Ans✓✓✓ stable air at middle level of the troposphere,
and it is often associated with gusty winds in the lee of mountain ranges
are foehn winds stable Ans✓✓✓ yes
are night temperatures warmer under timbers than a clearing ? Ans✓✓✓ true
are temps high on step slopes vs flat areas ? Ans✓✓✓ no flat areas are hotter
than slopes
as air parcel rises it Ans✓✓✓ expands
cools
becomes less dense
as air pressure decreases Ans✓✓✓ its volume will increase
, its density will decrease
its temperature will decrease
as air pressure increases Ans✓✓✓ its volume will decrease
it density will increase
and it temperature will increase
as air pressure increases Ans✓✓✓ temperature increases
volume decreases
as an air parcel sinks it Ans✓✓✓ compresses
warms
gets more dense
aspects affects fuels and their availability to burn by Ans✓✓✓ 1. southwest
slopes provide drier sites
2. Vegetation type and fuel moisture content changes by aspect
3. shading on northern aspects can increase relative humidity
available fuels are Ans✓✓✓ all dead and live fuels that will ignite and continue to
burn at a given time
average lapse rate Ans✓✓✓ 3.5F per 1000
average lapse rate for temperatures Ans✓✓✓ 3.5 degrees per 1000ft
