Wildland Fire S-190 Exam Prep (New 2024/ 2025 Update) Questions and Verified Answers| 100% Correct | A Grade
QUESTION
All combustible materials
... [Show More] lying on or immediately above the ground. i.e. needles or leaves, duff, grass, small dead wood, stumps, low shrubs, ets.
Answer:
Surface fuels
QUESTION
Combustible materials that aid the spread of fire form the surface to the upper canopy.
Answer:
Ladder fuels
QUESTION
All green and dead materials located in the upper canopy. i.e. tree branches and crowns, snags, hanging moss, and tall shrubs.
Answer:
Aerial fuels
QUESTION
The amount of water in a fuel, expressed as a percentage of the oven-dry weight of that fuel
Answer:
Fuel moisture
QUESTION
Fuels that have a high moisture content because of exposure to precipitation or high relative humidity.
Answer:
Wet fuels
QUESTION
Fuels that have low moisture content because of prolonged exposure to sunshine, dry winds, drought, or low relative humidity.
Answer:
Dry fuels
QUESTION
The rate at which dead fuels gains or loses moisture
Answer:
Timelag
QUESTION
What does direct sunlight and hot temperatures in the wild land fire environment do to fuels?
Answer:
It preheats them and brings them closer to their ignition point.
QUESTION
Relative Humidity
Answer:
the amount of moisture in the air divided by the amount the air could hold when saturated at the same air temperature; expressed in percent.
QUESTION
Low relative humidity is an indicator of what?
Answer:
high fire danger
QUESTION
Temperature and relative humidity have what kind of relationship?
Answer:
Inverse
QUESTION
When temperature increases, relative humidity...
When temperature decreases, relative humidity...
Answer:
decreases
increases
QUESTION
What do we use to measure relative humidity
Answer:
Sling psychrometer
QUESTION
The degree to which vertical motion in the atmosphere is enhanced or suppressed.
Answer:
Atmospheric stability
QUESTION
What is Stability directly related to?
Answer:
the temperature distribution of the atmosphere
QUESTION
An atmosphere that resists upward motion
Answer:
stable atmosphere
QUESTION
Indicators of a stable Atmosphere
Answer:
clouds in layers
stratus type clouds
smoke column drifts apart after limited rise
poor visibility due to smoke or haze
fog layers
steady winds
QUESTION
Warm air OVER Cold air = [Show Less]