S-290 questions with verified answers
______ air parcels compress and warm Ans✓✓✓ Sinking
_______ air parcels expand and cool Ans✓✓✓ Rising
1 Mile equals how many chains Ans✓✓✓ 80 chains
3 ways convection energy can spread a fire Ans✓✓✓ 1. Cause spot fires
2. Preheat fuels through air and increased direct flame contact
3. Increase the amount of oxygen introduced on a fire
6 Primary fuel factors that affect ignition of a wildland fire Ans✓✓✓ 1. moisture
2. size and
3. shape
4. arrangement
5. compactness
6. temperature
A chain is Ans✓✓✓ 66 feet
A column of cold, dry air is ______(lighter, heavier) and generally more
_______(stable, unstable) than a column of warm, humid air. Ans✓✓✓ Heavier
and stable
,A slope wind is caused by warm air ________ and cold air _________. Ans✓✓✓
Warm = Rising
Cold = settling
A surface fire that has a head and is spreading with the wind or slope is called
Ans✓✓✓ Running fire
About half of the weight of the atmoshere is below________ Ans✓✓✓ 18,000
feet
According to the ideal gas law, as air pressure increase, will temperature and
volume increase or decrease? Ans✓✓✓ temperature increases
volume decreases
Air that is forced to rise as it is pushed against mountainous terrain Ans✓✓✓
Orographic
As an air parcel rises and sinks, its energy and mass remain constant. This
describes what process? Ans✓✓✓ Adiabatic process
As an air parcel rises it.... Ans✓✓✓ expands, cools, and becomes less dense
Based on the normal daily temperature lag, when will the highest daytime
temperature most likely occur during summer? Ans✓✓✓ 3 p.m.
BTU per foot per second, rate of energy release, indicated by flame length, and
represents the ead output at the flame front is.... Ans✓✓✓ Fireline Inensity
, Common general winds associated with passage of cold fronts are.... Ans✓✓✓ 1.
Southeast switching to the southwest becoming very gusty then switching to a
very strong Northwest wind
2. 90 to 180 degrees shift clockwise with increasing strong gusty winds
Daytime coastal winds Ans✓✓✓ Sea-breeze onshore 10-20 mph
Daytime winds Ans✓✓✓ Up-slope 3-8 mph
Up canyon/valley 10-15 mph
Define Convergence: Ans✓✓✓ The coming together of two air masses
Define Flamelength Ans✓✓✓ The distant measured from the tip of the flame to
the middle of the flaming zone at base of fire.
Define Relative Humidity Ans✓✓✓ The RATIO of the amount of moisture in the
air, RELATIVE to the maximum amount of moisture that air could contain if it
were saturated.
Do winds flow from Low to High pressure systems or from High to low pressure
systems? Ans✓✓✓ High to low pressure
Fireline intensity is affected by... Ans✓✓✓ 1. Fuel loading
2. Compaction
______ air parcels compress and warm Ans✓✓✓ Sinking
_______ air parcels expand and cool Ans✓✓✓ Rising
1 Mile equals how many chains Ans✓✓✓ 80 chains
3 ways convection energy can spread a fire Ans✓✓✓ 1. Cause spot fires
2. Preheat fuels through air and increased direct flame contact
3. Increase the amount of oxygen introduced on a fire
6 Primary fuel factors that affect ignition of a wildland fire Ans✓✓✓ 1. moisture
2. size and
3. shape
4. arrangement
5. compactness
6. temperature
A chain is Ans✓✓✓ 66 feet
A column of cold, dry air is ______(lighter, heavier) and generally more
_______(stable, unstable) than a column of warm, humid air. Ans✓✓✓ Heavier
and stable
,A slope wind is caused by warm air ________ and cold air _________. Ans✓✓✓
Warm = Rising
Cold = settling
A surface fire that has a head and is spreading with the wind or slope is called
Ans✓✓✓ Running fire
About half of the weight of the atmoshere is below________ Ans✓✓✓ 18,000
feet
According to the ideal gas law, as air pressure increase, will temperature and
volume increase or decrease? Ans✓✓✓ temperature increases
volume decreases
Air that is forced to rise as it is pushed against mountainous terrain Ans✓✓✓
Orographic
As an air parcel rises and sinks, its energy and mass remain constant. This
describes what process? Ans✓✓✓ Adiabatic process
As an air parcel rises it.... Ans✓✓✓ expands, cools, and becomes less dense
Based on the normal daily temperature lag, when will the highest daytime
temperature most likely occur during summer? Ans✓✓✓ 3 p.m.
BTU per foot per second, rate of energy release, indicated by flame length, and
represents the ead output at the flame front is.... Ans✓✓✓ Fireline Inensity
, Common general winds associated with passage of cold fronts are.... Ans✓✓✓ 1.
Southeast switching to the southwest becoming very gusty then switching to a
very strong Northwest wind
2. 90 to 180 degrees shift clockwise with increasing strong gusty winds
Daytime coastal winds Ans✓✓✓ Sea-breeze onshore 10-20 mph
Daytime winds Ans✓✓✓ Up-slope 3-8 mph
Up canyon/valley 10-15 mph
Define Convergence: Ans✓✓✓ The coming together of two air masses
Define Flamelength Ans✓✓✓ The distant measured from the tip of the flame to
the middle of the flaming zone at base of fire.
Define Relative Humidity Ans✓✓✓ The RATIO of the amount of moisture in the
air, RELATIVE to the maximum amount of moisture that air could contain if it
were saturated.
Do winds flow from Low to High pressure systems or from High to low pressure
systems? Ans✓✓✓ High to low pressure
Fireline intensity is affected by... Ans✓✓✓ 1. Fuel loading
2. Compaction
