S-290 Final Exam – Wildland Fire Behavior, Firefighter Training & Exam Study Guide

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S-290 Final Exam

True

T/F Topography can directly and indirectly affect fuels and their availability for combustion.




Topography

Of the three primary environmental factors that influence fire behavior, which is the least variable?




Conduction

The least critical form of heat transfer that influences rate of spread in a running wild land fire is:




Ignition temperature

The point to which a combustible material must be heated to produce self-sustaining combustion is
known as the:




All of the above.

Fuel size

Fuel moisture

Fuel temperature

Fuel compactness and arrangement

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Fireline intensity is dependent upon:




True

T/F Two requirements for long range spotting are wind and a well developed convection column.




Crown fire

A fire that advances through canopies of brush and trees is known as a:




Surface fire with torching and spotting.

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.




Ground fire with smoldering and flare ups.

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.




False

T/F Upward moving air contracts and warms.



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Increases in pressure, warms and compresses.

As air sinks, it.




Because there is less water vapor in the air to absorb and reflect heat back to the surface at night.

Why do dry climates usually have lower nighttime temperatures than humid climates?




True

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.




False

T/F RH is usually lower on north aspects.




False


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