S-290 Fire Behavior Final Exam – S-290 Final Exam Questions, Answers & Study Guide

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FIRE BEHAVIOR




S-290 FIRE BEHAVIOR FINAL, S-290
FINAL EXAM


List three methods of mass transport of firebrands on wildland fires.
CONVECTION, WIND, GRAVITY
In an unstable atmosphere:
A and B
Describe how convection influences transport of firebrands.
A CONVECTION COLUMN CAN LIFT FIREBRANDS ABOVE THE FIRE, WHERE THE
WIND CAN CARRY IT AHEAD OF THE FIRE
The primary factors that affect rate of spread are:
Changes in fuel type, wind speed, and steepness of slope.
Which of the following changes would be expected to produce the largest change
in ROS?
A slope reversal with a 6 mph wind blowing at one slope
The four fuel factors that affect the ignition of wildland fires are:
Size and shape of fuels, compactness or arrangement of fuels, fuel moisture, and
fuel temperature.
Define fuel moisture content.
FUEL MOISTURE CONTENT IS THE AMOUNT OF WATER IN A FUEL, EXPRESSED AS
A PERCENT OF THE OVEN DRY WEIGHT OF THAT FUEL
The Fire Weather Planning Forecasts, Spot Forecasts, Red Flag Warnings, and
Smoke Management Forecasts are products issued by:
The National Weather Service



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Which one or more of the following statements are correct regarding wind driven
and plume dominated fires.
Wind driven fires are easier to predict the direction of spread.
List three methods used in the field to determine slope percent.
THE STICK METHOD, A CLINOMETER, AND A GPS
Upslope winds are typically weakest on what aspect?
North
The three stages of crown fire development include:
Passive, active, and independent
Slope affects fuel availability to burn because:
A and B.
Describe the difference between Fuel Group and Fuel Model.
A FUEL MODEL IS A SIMPLIFIED MATHMATICAL REPRESENTATION OF FUELS IN
THE REAL WORLD. A FUEL GROUP IS A GROUPING OF FUEL MODELS THAT SHARE
SIMILAR CHARACTERISTICS
Which of the following topographic variations in wind speed would you expect on
a sunny summer afternoon?
Time of day, month of year, dry bulb temperature, relative humidity, aspect,
percent slope, shading of surface fuels.
Inputs used to determine fine dead fuel moisture content are:
Time of day, month of year, dry bulb temperature, relative humidity, aspect,
percent slope, shading of surface fuels.
General winds are:
Large-scale winds caused by the pressure gradients associated with highs and
lows
If the wet bulb is not read at its lowest point on a psychrometer:



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The calculated relative humidity will be too high.
List three fire behavior situations that often result in large, sudden changes in fire
behavior.
SUDDEN CHANGE IN WIND, FUEL TYPE, OR TOPOGRAPHY
Branches above the fire are receiving heat by:
Radiation and convection
Relative humidity is:
A ratio of the amount of water vapor in the air to the amount of water vapor the
air could hold when saturated at the same temperature.
Define moisture of extinction.
THE MOISTURE OF EXTINCTION IS THE FUEL MOISTURE CONTENT AT WHICH A
FIRE WILL NOT SPREAD, OR SPREADS ONLY SPORADICALLY
Select the correct statement regarding the shape of the country and its effect on
wildland fire behavior.
The shape of the country can influence the curing of fuels as well as the intensity
and spread of wildland fires.
Select the statement that best describes the effect of slope on fuels.
A and C.
Of the three methods for obtaining live fuel moistures, the following produces the
most accurate results:
Collecting samples, weighing them, drying them and then weighing them again.
List in order the three main fuel types from slowest typical ROS to fastest typical
ROS.
LITTER, CROWN, GRASS
7-Day Significant Fire Potential, Monthly Fire Weather/Fire Danger Outlooks, and
Seasonal Assessments are all products produced by what organization?
Land Management Predictive Services


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