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What is an important factor to consider when observing the movement of smoke and flames?
What is an important factor to consider when observing the movement of smoke and flames?
- Wind direction and velocity (correct)
- The height of the flames
- The speed of the firefighters
- The color of the smoke
Why is it important to note the condition of doors and windows upon arrival?
Why is it important to note the condition of doors and windows upon arrival?
- To determine the temperature of the room
- To check for any broken glass
- To determine if they are locked or unlocked (correct)
- To identify the type of material used
What is the purpose of noting metal or plastic containers found inside or outside the structure?
What is the purpose of noting metal or plastic containers found inside or outside the structure?
- To investigate whether they were used to transport accelerants (correct)
- To identify the original fuel source
- To check for any signs of explosions
- To determine the type of accelerant used
What is a possible indication of accelerant use?
What is a possible indication of accelerant use?
What is the term for devices designed and used to start a fire?
What is the term for devices designed and used to start a fire?
What is the purpose of noting any altered structural features of the building?
What is the purpose of noting any altered structural features of the building?
What is the term for combustible materials used to spread fire from one area to another?
What is the term for combustible materials used to spread fire from one area to another?
What can be indicated by irregular burning or locally heavy charring in areas of little fuel?
What can be indicated by irregular burning or locally heavy charring in areas of little fuel?
Why is it important to note unusual odors during a fire investigation?
Why is it important to note unusual odors during a fire investigation?
What can be a sign of arson?
What can be a sign of arson?
What is an indicator of high heat intensity in a fire?
What is an indicator of high heat intensity in a fire?
What is a suspicious behavior in the context of insurance documents?
What is a suspicious behavior in the context of insurance documents?
What should be checked in fire detection and protection systems?
What should be checked in fire detection and protection systems?
What is unusual about fires burning in areas remote from normal ignition sources?
What is unusual about fires burning in areas remote from normal ignition sources?
What is a sign that preparations were made for a fire?
What is a sign that preparations were made for a fire?
Why should you not read too much into a shortage of material possessions?
Why should you not read too much into a shortage of material possessions?
What should be checked in intrusion alarms?
What should be checked in intrusion alarms?
What is an indicator of intentional fire setting?
What is an indicator of intentional fire setting?
What is an important factor to consider when investigating a fire at 0300 hours in a dwelling?
What is an important factor to consider when investigating a fire at 0300 hours in a dwelling?
Why might an arsonist set a fire during inclement weather?
Why might an arsonist set a fire during inclement weather?
What is a potential indication of an arsonist's attempt to impede firefighters' access?
What is a potential indication of an arsonist's attempt to impede firefighters' access?
What is an important observation to make if a vehicle is seen leaving the scene of a fire?
What is an important observation to make if a vehicle is seen leaving the scene of a fire?
Why might someone be seen leaving the scene of a fire on foot?
Why might someone be seen leaving the scene of a fire on foot?
What is an important factor to consider when investigating a fire in an office building after working hours?
What is an important factor to consider when investigating a fire in an office building after working hours?
What is an important observation to make when arriving at the scene of a fire?
What is an important observation to make when arriving at the scene of a fire?
Why might people remain at the scene of a fire?
Why might people remain at the scene of a fire?
What is the primary limiting factor on the heat release rate of a fire burning in the open?
What is the primary limiting factor on the heat release rate of a fire burning in the open?
During the incipient stage of a fire, what is the primary means of heat transfer to adjacent fuel?
During the incipient stage of a fire, what is the primary means of heat transfer to adjacent fuel?
What is the term for the flow of hot gases that rise from the fire and spread horizontally along the ceiling?
What is the term for the flow of hot gases that rise from the fire and spread horizontally along the ceiling?
What is possible during the incipient stage of a fire in a compartment?
What is possible during the incipient stage of a fire in a compartment?
Which of these options are correct? (Select all that apply)
Which of these options are correct? (Select all that apply)
This is an example statement that is true
This is an example statement that is true
Example question?
Example question?
The ______ barked
The ______ barked
Match the following programming languages with their primary usage:
Match the following programming languages with their primary usage:
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Study Notes
The question could
Stages of Fire Development
- Fires develop through four stages: incipient, growth, fully developed, and decay.
- Three key factors control how the fire develops: fuel properties, ventilation available, and heat conservation.
Incipient Stage
- Starts with ignition when the three elements of the fire triangle come together.
- Fire is small and confined to a small portion of the fuel first ignited.
- Radiant heat warms the adjacent fuel and continues the process of pyrolysis.
- A thin plume of hot gases and flame rises from the fire and mixes with the cooler air in the compartment.
- Hot gases in the plume rise until they encounter the ceiling and then begin to spread horizontally, forming the ceiling jet.
- Hot gases in contact with the surfaces of the compartment and its contents transfer heat to other materials.
- Temperature is only slightly above ambient in areas directly affected by the fire, plume, and ceiling jet.
- Occupants can safely escape from the compartment, and a portable extinguisher or small hoseline can safely extinguish the fire.
Growth Stage
- Fire transitions from incipient to growth stage, more of the initial fuel package becomes involved.
- Production of heat and smoke increases.
- Radiant heat from the fire may begin to pyrolize nearby fuels, spreading the fire to new fuel packages.
- Fire may continue to grow to become fully developed or may enter an early state of decay depending on available oxygen.
Fully Developed Stage
- Fire consumes the maximum amount of oxygen that it can.
- All combustible materials in the compartment are burning at their peak heat release rate.
- Fire is consuming the maximum amount of oxygen available.
- If the fire is limited to one fuel package, the fully developed stage occurs when the entire fuel package is on fire.
Decay Stage
- Fire consumes the available fuel or oxygen and the heat release rate begins to decline.
- Fuel-limited fires may self-extinguish in this phase or reduce to smoldering fires.
- Ventilation-limited fires may also self-extinguish.
- If oxygen becomes available during the decay stage before complete extinguishment, fires are likely to reenter the growth stage and rapidly become fully developed.
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