S-290 Final Exam A Latest Update -

S-290 Final Exam A 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 described as: - CORRECT ANSWER: A set of numbers 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

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

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

CORRECT ANSWER: Crown fire with convection column and firewhirls

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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: - CORRECT ANSWER: Surface fire with torching and spotting

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. - CORRECT ANSWER: Ground fire with smoldering and flare ups

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

have flame lengths that are __ - CORRECT ANSWER: Less than 4 feet

Fireline intensity is dependent upon: - CORRECT ANSWER: All of the above

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

ANSWER: Strong winds, warmer temps, and very low RH

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

Fuel loading: - CORRECT ANSWER: The oven dry weight of fuel in an given area, expressed in tons/acres or pounds/acres

Fuel moisture content: - CORRECT ANSWER: The amount of water in 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: - CORRECT ANSWER: The surface area to volume ration.

If the wet bulb is not read at its 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, RH, aspect, percent slope, shading of surface fuels.

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

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

variable? - CORRECT ANSWER: Topography

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