Wildland Firefighting Questions With
Correct Answers
Heavy fuels ( large diameter fuels ) Logs, stumps, and branches. Have small surface area
to volume ratios. More reactive to atmospheric changes and heat surfaces
Do fine fuels ignite easily and become consumed rapidly? Yes
Do heavy fuels take longer or require hotter heat source to reach ignition Yes
What burns longer, fine or or heavy fuels? Heavy
How do you assess the continuous or discontinuous of fuel Single tree, micro scale,
landscape level, macros scale
What is vertical fuel continuity? It's the characteristic of certain tree species.
What is ladder fuels used to describe? Lower branches or intermediate vegetation such as
shrubs
How does wind influence a fire? Influences the direction and rate of fire spread. Can
transport burning embers onto new fossil fuels.
, What type of terrain can influence wind? Mountainous. Daytime winds will be up valley
and upsloped, reverse at night.
Fuels heated by sun will ignite and burn faster than what? Cooler fuels
Dry air (lower relative humidity) will do what to fuels? Dry out fine fuels
Moist air ( higher relative humidity) will add what to fuels Moisture
What is relative humidity? The ratio, of the the amount of moisture in a volume of air to
the total amount which that volume can hold at the given temp and atmospheric pressure
Warm air can hold more what than cooler air? Moisture
What is atmospheric stability? It either assists or suppresses the vertical mixing of air, can
have significance influence on fire behaviour.
What does unstable air do? Assists very idle motion where air rises, cools and condenses
cumulus type clouds
What does stable air do? Resists verticals motion, air can stagnate and develop low level
clouds or fog
Correct Answers
Heavy fuels ( large diameter fuels ) Logs, stumps, and branches. Have small surface area
to volume ratios. More reactive to atmospheric changes and heat surfaces
Do fine fuels ignite easily and become consumed rapidly? Yes
Do heavy fuels take longer or require hotter heat source to reach ignition Yes
What burns longer, fine or or heavy fuels? Heavy
How do you assess the continuous or discontinuous of fuel Single tree, micro scale,
landscape level, macros scale
What is vertical fuel continuity? It's the characteristic of certain tree species.
What is ladder fuels used to describe? Lower branches or intermediate vegetation such as
shrubs
How does wind influence a fire? Influences the direction and rate of fire spread. Can
transport burning embers onto new fossil fuels.
, What type of terrain can influence wind? Mountainous. Daytime winds will be up valley
and upsloped, reverse at night.
Fuels heated by sun will ignite and burn faster than what? Cooler fuels
Dry air (lower relative humidity) will do what to fuels? Dry out fine fuels
Moist air ( higher relative humidity) will add what to fuels Moisture
What is relative humidity? The ratio, of the the amount of moisture in a volume of air to
the total amount which that volume can hold at the given temp and atmospheric pressure
Warm air can hold more what than cooler air? Moisture
What is atmospheric stability? It either assists or suppresses the vertical mixing of air, can
have significance influence on fire behaviour.
What does unstable air do? Assists very idle motion where air rises, cools and condenses
cumulus type clouds
What does stable air do? Resists verticals motion, air can stagnate and develop low level
clouds or fog
