WorksheetsFire Behavior
Total questions: 42
Worksheet time: 29mins
Define Ignition
The process of initiating self-sustained combustion
The process of initiating sustained combustion
Define combustion
Chemical process of combustion that occurs rapidly to produce heat and light
Chemical process of oxidation that occurs rapidly to produce heat and light
Chemical process of oxidation that occurs slowly to produce heat and light
Define heat of combustion
Total amount of thermal energy that could be generated by chemical reaction if a fuel were completely burned
Total amount of energy that could be generated by combustion reaction if a fuel were completely burned
Total amount of thermal energy that could be generated by combustion reaction if a fuel were completely burned
Define heat release rate
The energy release per unit of time. Measured in km or horsepower.
The energy release per unit of time. Measured in kw or horsepower.
What temperature range does flashover occur?
1000-1200 degrees F
1000-1500 degrees F
1200-2000 degrees F
What are the phases of fire in order?
Ignition/incipient, fully developed, growth, decay
Ignition/incipient, growth, fully developed, decay
Ignition/incipient, growth, decay, fully developed
Signs of flashover?
rollover, increased turbulence of the neutral plane, pyrolysis of materials, intense heat forcing crews lower, sudden lowering of neutral plane
rollover, decreased turbulence of the neutral plane, pyrolysis of materials, intense heat forcing crews lower, sudden lowering of neutral plane
rollover, increased turbulence of the neutral plane, pyrolysis of materials, intense heat forcing crews higher, sudden lowering of neutral plane
What gas has the highest flammable range?
(a)
If a gas is said to be rich it means that it is?
Above the flammable range
Below the flammable range
Identify the flow path directions. Click all that apply
Bi-directional flow
uni-directional flow
Tri-directional flow
What is not an examples of extreme fire behavior?
Smoke explosion
Backdraft
Flashover
Combustion
How to prevent flashover?
Clear the environment, coordinate ventilation, back out and re-evaluate
Cool the environment, coordinate ventilation, back out and re-evaluate
Cool the environment, initiate ventilation, back out and re-evaluate
3 types of heat transfer?
(a)
Laminar levels of thermal layering indicate?
(a)
Fire Tetrahedron?
Fuel, Energy, Oxygen, Chemical Chain Reaction
Fuel, Heat, Oxygen, Chemical Chain Reaction
Fire, Heat, Oxygen, Chemical Chain Reaction
First priority for engine company?
Coordinate ventilation
Search for and control the fire
Clear the environment
What method of heat transfer has currents that follow the path of least resistance spreading smoke, superheated gases, and flammable vapor?
(a)
Reaction that gives off heat?
(a)
How are ladder fuels transferred upward through smoke?
Convection, Conduction, and Radiation
Convection, Combustion, and Radiation
Convection, Conduction, and Reaction
Found in the early stages of a fire?
(a)
Found in later stages of a fire?
(a)
Fire inside a structure is dictated by the (a) ?
Rollover is best defined as?
Unburned fuel that has accumulated in the overpressure region will gradually reach its auto ignition rate (AIT) and pockets of partially mixed fire gases will begin to ignite across the ceiling
Unburned fuel that has accumulated in the overpressure region will gradually reach its auto ignition temperature (AIT) and pockets of partially mixed chemicals will begin to ignite across the ceiling
Unburned fuel that has accumulated in the overpressure region will gradually reach its auto ignition temperature (AIT) and pockets of partially mixed fire gases will begin to ignite across the ceiling
The chemical decomposition of a substance through the action of heat best describes?
(a)
There is sufficient oxygen available for the fuel to be consumed unhindered by the fire?
(a)
Fire grows to the point where the openings are insufficient to allow enough air to feed the fire?
(a)
Flashover is best defined as?
The sudden transition to a fully developed fire involving all of the combustibles
The sudden transition to a fully developed fire involving all of the reactions
The gradual transition to a fully developed fire involving all of the combustibles
The sudden transition to a partially developed fire involving all of the combustibles
Fire Behavior Indicators: What does BSHAF stand for?
(a)
Air Track:
On that floor
steady bidirectional air track
If there is no neutral plane present and the doorway appears to be serving as an air inlet, or if the neutral plane raises to the top of the doorway, with smoke exiting relatively slowly
if the neutral plane stays low to the floor with limited or no air being drawn
Air Track:
Fire Above
steady bidirectional air track
If there is no neutral plane present and the doorway appears to be serving as an air inlet, or if the neutral plane raises to the top of the doorway, with smoke exiting relatively slowly
if the neutral plane stays low to the floor with limited or no air being drawn
Air Track:
Fire Below
If there is no neutral plane present and the doorway appears to be serving as an air inlet, or if the neutral plane raises to the top of the doorway, with smoke exiting relatively slowly
if the neutral plane stays low to the floor with limited or no air being drawn
steady bidirectional air track
What percent of smoke is fuel?
(a)
the fuel and oxygen mixture encounter a heat source with sufficient heat energy to start the combustion reaction
Auto ignition
Piloted ignition
Fire Dynamics
Auto ignition temperature of CO?
(a)
The primary oxidizing agent involved in most fires is?
(a)
measurement of how fast the particles in a substance are moving
Smoke
Heat
Temperature
Fire Dynamics
detailed study of how chemistry, fire science, and the engineering disciplines of fluid mechanics and heat transfer interact to influence the fire behavior
Auto ignition
Fire dynamics
Heat
What is when fuel and oxygen mixture are heated to its ignition temperature?
(a)
Hemoglobin binds carbon monoxide (CO)
200 to 300 times more than with oxygen
100 to 200 times more than with oxygen
300 to 400 times more than with oxygen
Reaction that emits heat?
(a)
Laminar levels of thermal layering indicate______.
unstable conditions
Stable conditions
Which of the following is NOT a toxic gas emitted by fire?
Carbon Dioxide
Carbon monoxide
Nitrogen Oxide
