NR 307 Dicus FInal 2019 Cal Poly exam with complete solutions
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Module
NR 307
Institution
NR 307
What 3 entities are necessary for combustion?
oxygen, heat, and fuel
3 parts to fire?
Photosynthesis --> Decay --> Combustion
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Pre- Heating
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NR 307 Dicus FInal 2019 Cal Poly exam
with complete solutions
What 3 entities are necessary for combustion? - ANSWER- oxygen, heat, and fuel
3 parts to fire? - ANSWER- Photosynthesis --> Decay --> Combustion
Pre- Heating - ANSWER- Pilot source like sun raises temp of fuels
Dehydration drive extracts to the surface
Pyrolisis degrades molecules to volatiles that support combustion
Ignition - ANSWER- Humans, Lightning, Volcanoes, and possibly meteorites
Combustion - ANSWER- 1. Burning of volatile gas
2. glowing or smoldering-- low heat, burns for a long time
Extinction - ANSWER- When the heat of vaporization is greater than the
temperature of the fire
Conduction - ANSWER- The DIRECT transfer of heat from one substance to
another substance that it is touching.
Convection - ANSWER- The transfer of heat by the movement of a gas
Important for steep slopes and heavy wind events
Radiation - ANSWER- The transfer of heat by electromagnetic waves
Ground Fuels - ANSWER- All combustible materials lying beneath the surface
Surface fuels - ANSWER- Fuels that are close to the surface of the ground, such
as grass, leaves, twigs, needles, small trees, logging slash, and low brush.
Aerial fuels - ANSWER- Fuels located more than 6 feet off the ground, usually part
of or attached to trees.
Timelag - ANSWER- The rate at which dead fuel gains or loses moisture
Temperature - ANSWER- the angle of the sun on the hills or flatlands
preheats fuels and lowers relative humidity
amount of time the sun hits fuels
Relative Humidity - ANSWER- lowest at mid afternoon when the temps are the
highest because high temperatures can hold the most moisture
Winds - ANSWER- Higher wind promotes fire intensity
- supplies more oxygen
-transfers heat to fuels by convection
-takes away moisture
-steeper the slope the faster and moe intense a fire burns
north facing aspect - ANSWER- carries heavier fuels
higher moisture
later curing
chimney effect - ANSWER- strong updrafts in drainage
-rapid burnout and extreme intensity
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