S-290 Final Exam Latest Update -

S-290 Final Exam Latest Update - Actual Exam Questions and 100% Verified Correct Answers Guaranteed A+

• hour timelag fuel moisture is used in fire behavior calculations to determine: -

CORRECT ANSWER: Whether fine dead fuels are available for ignition and fire spread.

• factors that are responsible for the occurrence of fire behavior in the third dimension

are: - CORRECT ANSWER: Available fuels, wind, low atmospheric moisture, and instability.

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

ANSWER: Crown fire

A fuel model is defined as: - CORRECT ANSWER: A set of tubers that define fuel input for use in the surface fire spread model.

A ground fire has burned under a thick stand of pine reproduction. What potential problems could occur? - CORRECT ANSWER: A return possibly involving the canopies.

A slope wind is caused by: - CORRECT ANSWER: Warm air rising and cold air settling.

A wind is caused by: - CORRECT ANSWER: The direction the wind is blowing from.

As air sinks, it. - CORRECT ANSWER: Increases in pressure, warms and compresses.

Aspect affects fuels and their availability to burn because: - CORRECT ANSWER: All of the above are correct Southwest slopes provide drier sites Vegetation type and fuel moisture content changes by aspect Shading on northern aspects can increase RH

Available fuels are: - CORRECT ANSWER: All dead and live fuels that will ignite and continue to burn.

East, Mono, Santa Ana, and Chinook are all examples of: - CORRECT ANSWER: Foehn winds

En route to a fire you notice that smoke from a burning haystack rises straight up. What could this indicate on a wild land fire: - CORRECT ANSWER: An unstable atmosphere may increase fire activity.

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 1 / 2

can be seen carried high into the convection column with a whirling motion. -

CORRECT ANSWER: Ground fire with smoldering and flare ups.

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. - CORRECT ANSWER: Surface fire with torching and spotting.

Fire which can generally be attacked at the head or flanks by persons using hand tools

have flame lengths that are____. - CORRECT ANSWER: Less that 4 feet

Fireline intensity is dependent upon: - CORRECT ANSWER: All of the above.Fuel size Fuel moisture Fuel temperature Fuel compactness and arrangement

Foehn winds can adversely affect wild land fires because they can produce: -

CORRECT ANSWER: Strong winds, warmer temperatures, and very low RH.

Fuel chemical content definition: - CORRECT ANSWER: The presence of volatile substances in a fuel.

Fuel loading definition: - CORRECT ANSWER: The oven dry wight of fuel in an given area, expressed in tons/acre or pounds/acre.

Fuel moisture content definition: - CORRECT ANSWER: The amount of water in a fuel expressed as a percent of the oven dry weight of that fuel.

Fuel moisture timelag can best be described as: - CORRECT ANSWER: The rate at which dead fuel gains or loses moisture.

Fuel size and shape definition: - CORRECT ANSWER: The surface-area-to-flume ratio.

If the wet build is not read at it's lowest point, what will happen? - CORRECT ANSWER: The calculated RH will be too high.

Initiate action based on ____ fire behavior. - CORRECT ANSWER: Current and

expected

Inputs used to determine fine dead fuel moisture content are: - CORRECT ANSWER: Time of day, month of year, dry bulb temperature, RH, aspect, percent slope, shading of surface fuels.

Local winds are best defined as: - CORRECT ANSWER: Small scale convective winds of local origin caused by differences in heating and cooling.

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