S-290 Final Exam A
T/F Topography can directly and indirectly affect fuels and their availability for
combustion? - answer True
Of the three primary environmental factors that influence fire behavior, which is the least
variable? - answer Topography
The least critical form of heat transfer that influences rate of spread in a running wild
land fire is: - answer Conduction
The point to which a combustible material must be heated to produce self sustaining
combustion is known as the: - answerIgnition temperature
Fireline intensity is dependent upon: - answerAll of the above
T/F Two requirements for long-range spotting are wind and a well developed convection
column: - answerTrue
A fire that advances through canopies of brush and trees is known as a: - answerCrown
fire
Fire is burning in litter on top of the ground, but occasionally carries into crowns of
individual trees, which produces buying embers that start new fires outside the fire
perimeter: - answerSurface fire with torching and spotting
Fire begins burning into the crowns and spreads through the canopy. There is a sudden
increase in fireline intensity where the fire controls it's environment. At one point flames
can be seen carried high into the convection column with a whirling motion. -
answerCrown fire with convection column and firewhirls
Fire is consuming the organic materials beneath the surface of the ground after the
main fie has passed through and is spreading on the surface without flames.
Occasionally the fire will ignite areas of unburned fuels on the surface and short fire
runs take place. - answerGround fire with smoldering and flare ups
T/F Upward movie air contracts and warms: - answerFalse
As air sinks, it: - answerIncreases in pressure, warms and compresses
T/F On average the RH doubles with each 20F decrease of temperature, or halves with
each 20F increase of temperature. - answerTrue
, T/F The lowest RH occurs with the highest temperature. - answerTrue
T/F RH is usually lower on north aspects. - answerFalse
T/F Cloudiness has little affect on RH and temperature. - answerFalse
T/F the type of vegetation has little affect on temperature and RH. - answerFalse
T/F RH measures the amount of moisture in the air. - answerFalse
S/U Clouds form in layers. - answerStable
S/U Gusty winds - answerUnstable
S/U Smoke column spreads out after limited rise. - answerStable
S/U Clouds grow vertically. - answerUnstable
S/U Firebrands lifted into convection column. - answerUnstable
T/F Temperature decreases with an increase in elevation when an inversion is present.
- answerFalse
What conditions will occur under a surface inversion during the morning hours? -
answerAll of the above.
What are the different lifting procedures that can lead to thunderstorm development? -
answerFrontal, orographic, thermal, convergence
T/F Unstable air can often be found in low pressure systems and on the leading edge of
cold fronts. - answerTrue
T/F Unstable air can be formed either by hearing the air near the ground or by cooling
the air aloft. - answerTrue
Wind direction is: - answerThe direction the wind is blowing from
A slope wind is caused by - answerWarm air rising and cold air settling
Foehn winds can adversely affect wild land fires because the can produce: -
answerStrong winds, warmer temps, and very low RH
When stable air is forced over a mountain range, and then descends the leeward slopes
dry, warmed air, it is called: - answerA foehn wind
T/F Bends in canyons are likely places for wind eddies to form: - answerTrue
T/F Topography can directly and indirectly affect fuels and their availability for
combustion? - answer True
Of the three primary environmental factors that influence fire behavior, which is the least
variable? - answer Topography
The least critical form of heat transfer that influences rate of spread in a running wild
land fire is: - answer Conduction
The point to which a combustible material must be heated to produce self sustaining
combustion is known as the: - answerIgnition temperature
Fireline intensity is dependent upon: - answerAll of the above
T/F Two requirements for long-range spotting are wind and a well developed convection
column: - answerTrue
A fire that advances through canopies of brush and trees is known as a: - answerCrown
fire
Fire is burning in litter on top of the ground, but occasionally carries into crowns of
individual trees, which produces buying embers that start new fires outside the fire
perimeter: - answerSurface fire with torching and spotting
Fire begins burning into the crowns and spreads through the canopy. There is a sudden
increase in fireline intensity where the fire controls it's environment. At one point flames
can be seen carried high into the convection column with a whirling motion. -
answerCrown fire with convection column and firewhirls
Fire is consuming the organic materials beneath the surface of the ground after the
main fie has passed through and is spreading on the surface without flames.
Occasionally the fire will ignite areas of unburned fuels on the surface and short fire
runs take place. - answerGround fire with smoldering and flare ups
T/F Upward movie air contracts and warms: - answerFalse
As air sinks, it: - answerIncreases in pressure, warms and compresses
T/F On average the RH doubles with each 20F decrease of temperature, or halves with
each 20F increase of temperature. - answerTrue
, T/F The lowest RH occurs with the highest temperature. - answerTrue
T/F RH is usually lower on north aspects. - answerFalse
T/F Cloudiness has little affect on RH and temperature. - answerFalse
T/F the type of vegetation has little affect on temperature and RH. - answerFalse
T/F RH measures the amount of moisture in the air. - answerFalse
S/U Clouds form in layers. - answerStable
S/U Gusty winds - answerUnstable
S/U Smoke column spreads out after limited rise. - answerStable
S/U Clouds grow vertically. - answerUnstable
S/U Firebrands lifted into convection column. - answerUnstable
T/F Temperature decreases with an increase in elevation when an inversion is present.
- answerFalse
What conditions will occur under a surface inversion during the morning hours? -
answerAll of the above.
What are the different lifting procedures that can lead to thunderstorm development? -
answerFrontal, orographic, thermal, convergence
T/F Unstable air can often be found in low pressure systems and on the leading edge of
cold fronts. - answerTrue
T/F Unstable air can be formed either by hearing the air near the ground or by cooling
the air aloft. - answerTrue
Wind direction is: - answerThe direction the wind is blowing from
A slope wind is caused by - answerWarm air rising and cold air settling
Foehn winds can adversely affect wild land fires because the can produce: -
answerStrong winds, warmer temps, and very low RH
When stable air is forced over a mountain range, and then descends the leeward slopes
dry, warmed air, it is called: - answerA foehn wind
T/F Bends in canyons are likely places for wind eddies to form: - answerTrue
