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S- 190 WILDLAND FIRE BEHAVIOR Newest Exam
Preparation With Complete Questions And Correct
Answers With Rationales Already Graded A+Brand
New Version!!
QUESTION 1
What are the three components of the fire triangle?
A) Fuel, moisture, wind
B) Heat, fuel, oxygen
C) Temperature, humidity, slope
D) Ignition source, vegetation, terrain
Correct Answer: B
Explanation: The fire triangle illustrates that fire requires three
elements—heat, fuel, and oxygen—to sustain combustion. Removing
any single one of these elements will extinguish the fire. Fuel, weather,
and topography (option A) are the components of the fire
ENVIRONMENT triangle, not the fire triangle. Temperature, humidity,
and slope (option C) are environmental factors that affect fire behavior
but are not the fundamental elements required for combustion.
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QUESTION 2
What is the precise definition of the "point of origin" of a wildland fire?
A) The location where the fire is most intense
B) The precise location where a competent ignition source came into
contact with the material first ignited and sustained combustion
occurred
C) The area where the fire spreads fastest
D) The center of the fire perimeter
Correct Answer: B
Explanation: The point of origin is the exact location where ignition
occurred and sustained combustion began. This is the starting point for
fire investigation and suppression strategy. The head of the fire (options
A and C) is where the fire spreads fastest and is most intense. The center
of the fire perimeter (option D) is not a standard term used in wildland
fire behavior.
QUESTION 3
Which side of a fire has the greatest rate of spread?
A) Rear
B) Flank
C) Head
D) Heel
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Correct Answer: C
Explanation: The head of a fire is the side having the fastest rate of
spread and moves most intensely. A fire may have more than one head
under certain conditions. The rear or heel (options A and D) is opposite
to the head and closest to the point of origin, spreading slowly. Flanks
(option B) are the sides of a wildland fire and may change to the head if
fingers form because of fuel conditions.
QUESTION 4
A wildland fire is burning on a 60% slope with fuel and weather
identical to flat ground. Which factor best explains the increased rate of
spread uphill?
A) Increased wind speed on the slope
B) The south-facing aspect of the slope
C) Radiant and convective heat from the fire preheating the upslope
fuels
D) Gravity pulling flames downward
Correct Answer: C
Explanation: On steep slopes, flames are closer to the unburned fuels
above, allowing more efficient preheating by radiation and convection.
This preheating dries and ignites fuels faster, increasing the spread rate.
Aspect does not inherently vary with slope steepness, and wind is not
necessarily higher on slopes. Gravity does not pull flames downward in
a manner that would increase uphill spread.
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QUESTION 5
Given a temperature drop from 95°F to 75°F and relative humidity
increase from 10% to 40%, the dead fine fuel moisture (from laboratory
equilibrium) is most likely to:
A) Double
B) Triple
C) Remain the same
D) Decrease by half
Correct Answer: B
Explanation: At 95°F and 10% RH, equilibrium moisture content is
approximately 2-3%. At 75°F and 40% RH, it is approximately 7-8%. This
represents an increase by a factor of about three. Fuel moisture content
is critically important to fire behavior because it determines how readily
fuels will ignite and sustain combustion.
QUESTION 6
A surface fire has a flame length of 5 ft. The canopy base height of the
overstory is 12 ft, with continuous ladder fuels. Which statement best
describes the expected fire behavior?
A) No crown fire activity is possible
B) Active crown fire is imminent
C) Passive crown fire may occur
D) The fire will remain a surface fire only
S- 190 WILDLAND FIRE BEHAVIOR Newest Exam
Preparation With Complete Questions And Correct
Answers With Rationales Already Graded A+Brand
New Version!!
QUESTION 1
What are the three components of the fire triangle?
A) Fuel, moisture, wind
B) Heat, fuel, oxygen
C) Temperature, humidity, slope
D) Ignition source, vegetation, terrain
Correct Answer: B
Explanation: The fire triangle illustrates that fire requires three
elements—heat, fuel, and oxygen—to sustain combustion. Removing
any single one of these elements will extinguish the fire. Fuel, weather,
and topography (option A) are the components of the fire
ENVIRONMENT triangle, not the fire triangle. Temperature, humidity,
and slope (option C) are environmental factors that affect fire behavior
but are not the fundamental elements required for combustion.
,2|Page
QUESTION 2
What is the precise definition of the "point of origin" of a wildland fire?
A) The location where the fire is most intense
B) The precise location where a competent ignition source came into
contact with the material first ignited and sustained combustion
occurred
C) The area where the fire spreads fastest
D) The center of the fire perimeter
Correct Answer: B
Explanation: The point of origin is the exact location where ignition
occurred and sustained combustion began. This is the starting point for
fire investigation and suppression strategy. The head of the fire (options
A and C) is where the fire spreads fastest and is most intense. The center
of the fire perimeter (option D) is not a standard term used in wildland
fire behavior.
QUESTION 3
Which side of a fire has the greatest rate of spread?
A) Rear
B) Flank
C) Head
D) Heel
,3|Page
Correct Answer: C
Explanation: The head of a fire is the side having the fastest rate of
spread and moves most intensely. A fire may have more than one head
under certain conditions. The rear or heel (options A and D) is opposite
to the head and closest to the point of origin, spreading slowly. Flanks
(option B) are the sides of a wildland fire and may change to the head if
fingers form because of fuel conditions.
QUESTION 4
A wildland fire is burning on a 60% slope with fuel and weather
identical to flat ground. Which factor best explains the increased rate of
spread uphill?
A) Increased wind speed on the slope
B) The south-facing aspect of the slope
C) Radiant and convective heat from the fire preheating the upslope
fuels
D) Gravity pulling flames downward
Correct Answer: C
Explanation: On steep slopes, flames are closer to the unburned fuels
above, allowing more efficient preheating by radiation and convection.
This preheating dries and ignites fuels faster, increasing the spread rate.
Aspect does not inherently vary with slope steepness, and wind is not
necessarily higher on slopes. Gravity does not pull flames downward in
a manner that would increase uphill spread.
, 4|Page
QUESTION 5
Given a temperature drop from 95°F to 75°F and relative humidity
increase from 10% to 40%, the dead fine fuel moisture (from laboratory
equilibrium) is most likely to:
A) Double
B) Triple
C) Remain the same
D) Decrease by half
Correct Answer: B
Explanation: At 95°F and 10% RH, equilibrium moisture content is
approximately 2-3%. At 75°F and 40% RH, it is approximately 7-8%. This
represents an increase by a factor of about three. Fuel moisture content
is critically important to fire behavior because it determines how readily
fuels will ignite and sustain combustion.
QUESTION 6
A surface fire has a flame length of 5 ft. The canopy base height of the
overstory is 12 ft, with continuous ladder fuels. Which statement best
describes the expected fire behavior?
A) No crown fire activity is possible
B) Active crown fire is imminent
C) Passive crown fire may occur
D) The fire will remain a surface fire only
