S290 Final A and B Practice Exam With Answers (224 Solved Questions)

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S-290 Final A And B Exam With Verified Questions and AnswersAs air sinks, it. - Increases in pressure, warms and compresses.As air sinks, it. - Increases in pressure, warms and compresses.Why do dry climates usually have lower nighttime temperatures thanhumid climates? - Because there is less water vapor in the air to absorband reflect heat back to the surface at night.Why do dry climates usually have lower nighttime temperatures thanhumid climates? - Because there is less water vapor in the air to absorband reflect heat back to the surface at night.T/F On average the RH doubles with each 20F decrease of temperature,or halves with each 20F increase in temperature. - TrueT/F On average the RH doubles with each 20F decrease of temperature,or halves with each 20F increase in temperature. - TrueT/F The lowest RH occurs with the highest temperature. - TrueT/F The lowest RH occurs with the highest temperature. - TrueT/F RH is usually lower on north aspects. - FalseT/F RH is usually lower on north aspects. - False

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T/F Cloudiness has little affect on relative humidity and temperature. -FalseT/F Cloudiness has little affect on relative humidity and temperature. -FalseT/F The type of vegetation has little affect on temperature and humidity. -FalseT/F The type of vegetation has little affect on temperature and humidity. -FalseT/F RH measures the amount of moisture in the air. - TrueT/F RH measures the amount of moisture in the air. - TrueS/U Clouds form in layers. - StableS/U Clouds form in layers. - StableS/U Gusty winds - UnstableS/U Gusty winds - UnstableS/U Smoke column spreads out after limited rise. - Stable

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S/U Smoke column spreads out after limited rise. - StableS/U Clouds grow vertically - UnstableS/U Clouds grow vertically - UnstableS/U Firebrands are lifted into convection column. - UnstableS/U Firebrands are lifted into convection column. - UnstableT/F Temperature decreases with an increase in elevation when aninversion is present. - FalseT/F Temperature decreases with an increase in elevation when aninversion is present. - FalseWhat is the general effect of stable air on wild land fires? - Fire activitydecreasesWhat is the general effect of stable air on wild land fires? - Fire activitydecreasesWhat conditions will occur under a surface inversion during the morninghours? - All of the aboveTemperatures are cool, winds are calm or lightFire activity is decreasedPollutants can accumulate under inversions

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What conditions will occur under a surface inversion during the morninghours? - All of the aboveTemperatures are cool, winds are calm or lightFire activity is decreasedPollutants can accumulate under inversionsT/F Topography can directly and indirectly affect fuels and theiravailability for combustion. - TrueT/F Topography can directly and indirectly affect fuels and theiravailability for combustion. - TrueOf the three primary environmental factors that influence fire behavior,which is the least variable? - TopographyOf the three primary environmental factors that influence fire behavior,which is the least variable? - TopographyThe least critical form of heat transfer that influences rate of spread in arunning wild land fire is: - ConductionThe least critical form of heat transfer that influences rate of spread in arunning wild land fire is: - ConductionThe point to which a combustible material must be heated to produce self-sustaining combustion is known as the: - Ignition temperature

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The point to which a combustible material must be heated to produce self-sustaining combustion is known as the: - Ignition temperatureFireline intensity is dependent upon: - All of the above.Fuel sizeFuel moistureFuel temperatureFuel compactness and arrangementFireline intensity is dependent upon: - All of the above.Fuel sizeFuel moistureFuel temperatureFuel compactness and arrangementT/F Two requirements for long range spotting are wind and a welldeveloped convection column. - TrueT/F Two requirements for long range spotting are wind and a welldeveloped convection column. - TrueA fire that advances through canopies of brush and trees is known as a: -Crown fireA fire that advances through canopies of brush and trees is known as a: -Crown fire

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Fire is burning in litter on top of the ground, but occasionally carries intothe crowns of individual trees, which produces burning embers that startnew fires outside the fire perimeter. - Surface fire with torching andspotting.Fire is burning in litter on top of the ground, but occasionally carries intothe crowns of individual trees, which produces burning embers that startnew fires outside the fire perimeter. - Surface fire with torching andspotting.Fire begins burning into the crowns and spreads through the canopy.There is a sudden increase in fireline intensity where the fire controls it'senvironment. At one point flames can be seen carried high into theconvection column with a whirling motion. - Ground fire with smolderingand flare ups.Fire begins burning into the crowns and spreads through the canopy.There is a sudden increase in fireline intensity where the fire controls it'senvironment. At one point flames can be seen carried high into theconvection column with a whirling motion. - Ground fire with smolderingand flare ups.T/F Upward moving air contracts and warms. - FalseT/F Upward moving air contracts and warms. - False

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What are the different lighting processes that can lead to thunderstormdevelopment? - Frontal, orographic, thermal, convergenceWhat are the different lighting processes that can lead to thunderstormdevelopment? - Frontal, orographic, thermal, convergenceT/F Unstable air can often be found in low pressure systems and on theleading edge of cold fronts. - TrueT/F Unstable air can often be found in low pressure systems and on theleading edge of cold fronts. - TrueT/F Unstable air can be formed by either heating the air near the groundor by cooling the air aloft. - TrueT/F Unstable air can be formed by either heating the air near the groundor by cooling the air aloft. - TrueWind direction is: - The direction the wind is blowing from.Wind direction is: - The direction the wind is blowing from.A wind is caused by: - The direction the wind is blowing from.A wind is caused by: - The direction the wind is blowing from.

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A slope wind is caused by: - Warm air rising and cold air settling.A slope wind is caused by: - Warm air rising and cold air settling.Foehn winds can adversely affect wild land fires because they canproduce: - Strong winds, warmer temperatures, and very low RH.Foehn winds can adversely affect wild land fires because they canproduce: - Strong winds, warmer temperatures, and very low RH.When stable air is forced over a mountain range, and then descends theleeward slopes as dry, warmed air, it is called: - A foehn windWhen stable air is forced over a mountain range, and then descends theleeward slopes as dry, warmed air, it is called: - A foehn windT/F Bends in canyons are likely places for wind eddies to form. - TrueT/F Bends in canyons are likely places for wind eddies to form. - TrueLocal winds are best defined as: - Small scale convective winds of localorigin caused by differences in heating and cooling.Local winds are best defined as: - Small scale convective winds of localorigin caused by differences in heating and cooling.East, Mono, Santa Ana, and Chinook are all examples of: - Foehn winds

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