S-290 Final Exam/questions and answers/2025
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T/F Topography can directly and indirectly affect fuels and their availability for combustion. -
True
Of the three primary environmental factors that influence fire behavior, which is the least
variable? - Topography
The least critical form of heat transfer that influences rate of spread in a running wild land fire
is: - Conduction
The point to which a combustible material must be heated to produce self-sustaining
combustion is known as the: - Ignition temperature
Fireline intensity is dependent upon: - All of the above.
Fuel size
Fuel moisture
Fuel temperature
Fuel compactness and arrangement
T/F Two requirements for long range spotting are wind and a well developed convection
column. - True
A fire that advances through canopies of brush and trees is known as a: - Crown fire
, Fire is burning in litter on top of the ground, but occasionally carries into the crowns of
individual trees, which produces burning embers that start new fires outside the fire perimeter.
- Surface 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. - Ground fire with
smoldering and flare ups.
T/F Upward moving air contracts and warms. - False
As air sinks, it. - Increases in pressure, warms and compresses.
Why do dry climates usually have lower nighttime temperatures than humid climates? -
Because there is less water vapor in the air to absorb and reflect heat back to the surface
at night.
T/F On average the RH doubles with each 20F decrease of temperature, or halves with each 20F
increase in temperature. - True
T/F The lowest RH occurs with the highest temperature. - True
T/F RH is usually lower on north aspects. - False
T/F Cloudiness has little affect on relative humidity and temperature. - False
T/F The type of vegetation has little affect on temperature and humidity. - False
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T/F Topography can directly and indirectly affect fuels and their availability for combustion. -
True
Of the three primary environmental factors that influence fire behavior, which is the least
variable? - Topography
The least critical form of heat transfer that influences rate of spread in a running wild land fire
is: - Conduction
The point to which a combustible material must be heated to produce self-sustaining
combustion is known as the: - Ignition temperature
Fireline intensity is dependent upon: - All of the above.
Fuel size
Fuel moisture
Fuel temperature
Fuel compactness and arrangement
T/F Two requirements for long range spotting are wind and a well developed convection
column. - True
A fire that advances through canopies of brush and trees is known as a: - Crown fire
, Fire is burning in litter on top of the ground, but occasionally carries into the crowns of
individual trees, which produces burning embers that start new fires outside the fire perimeter.
- Surface 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. - Ground fire with
smoldering and flare ups.
T/F Upward moving air contracts and warms. - False
As air sinks, it. - Increases in pressure, warms and compresses.
Why do dry climates usually have lower nighttime temperatures than humid climates? -
Because there is less water vapor in the air to absorb and reflect heat back to the surface
at night.
T/F On average the RH doubles with each 20F decrease of temperature, or halves with each 20F
increase in temperature. - True
T/F The lowest RH occurs with the highest temperature. - True
T/F RH is usually lower on north aspects. - False
T/F Cloudiness has little affect on relative humidity and temperature. - False
T/F The type of vegetation has little affect on temperature and humidity. - False
