Fire in the Field exam questions: S- 190

Name two types of canyons that can result in extreme fire behavior:

Box canyon Narrow canyon

The vertical arrangement of ladder fuel describes what?

Fuels that link surface materials to the upper canopy

The moisture content of which type of fuel is most affected by change in relative humidity?

Grass

List four of the sic basic fuel types:

Grass Grass- Shrub Shrub Timber Timber- Understory Slash- Blowdown

Fire producing sparks or embers that are carried by wind or convection and starts new fires beyond the main fire-

Spotting

Hazards of a thunderstorm include:

Strong winds Lightning Erratic fire behavior (All the above)

List three weather factors which may produce rapid fire spread

Thunderstorms Frontal passage Fire whirls Dust devils Foehn Winds

List three indicators that fire behavior is increasing

Torching Flare-ups Crowning Increased rate of spread Increase in spotting

What are the three methods of heat transfer?

radiation, conduction, convection

What is one wind indicator to be aware of that can lead to increased fire behavior?

Cold frontal passage Shifting winds Increasing winds Erratic winds

What happens when oxygen is removed from the fire triangle?

Combustion cannot occur

As relative humidity decrease fuel moistures:

Decrease

T or F: A north facing aspect will have more fire activity than a south facing aspect

False

Relative humidity is usually at its lowest in the:

Mid-afternonn

What are the three components of the fire triangle?

Oxygen, Fuel, Heat

Lis two dangerous conditions that can develop when a fire is burning in a steep narrow canyon:

Preheating Spotting Rolling material Increased rate of spread Wind influences

Four examples of a barrier:

Rock-slide River Lake Road Fireline Green Field

Fire spreading rapidly with a well defined head-

Running

Fire burning without flame and barely spreading-

Smoldering

What are the two types of horizontal arrangements of fuels?

Uniform Patchy

When is fire controlled?

When the fire is expected to hold under all conditions.

What factor influences fire spread more than any other?

Wind