evidence based structural firefighting Flashcards
The rate at which a fire releases energy or the fire’s power is represented by which of the following measurements?
Heat Release Rate
Which state must a fuel be in for combustion to take place?
Vapor
The transfer of heat in the form of electromagnetic waves that carry energy from one object to another is called
radiation
the neutral plane is the:
horizontal plane where exhaust and inlet meet
is it possible to have more than one flow path in a residential structure
yes
a decaying ventilation-limited fire needs to draw in additional air (oxygen) to continue burning, otherwise it will self-extinguish because the lack of oxygen will stop the combustion process
true
typically the fire will be in which stage/state upon fire department arrival
ventilation limited
the ability to contain a fire to an area and limit the spread of fire and smoke to other areas of a structure is called
compartmentation
what construction feature is most likely to contribute to fire extension upward through the walls of the structure
balloon frame
the thick quilted part of a turnout coat is the
thermal liner
the current testing criteria allow for a hole in the SCBA face-piece as long as it provides a positive pressure environment for 24 minutes on a 30 minute bottle
true
heat transfers through compressed turnout gear faster than through uncompressed gear
true
which method of gross decon would you select for the most effective removal of PAHS and other toxicants from your turnout gear
wet-soap decontamination
the greater the thermal difference and the height of the structure, the greater the buoyancy force
true
when a hose stream is aimed at an energized electrical component, a distance of ___ feet reduced potential shock hazard from a 1000 Vdc source to a level considered safe
20
in a fire in a strip mall, if suppression is delayed, keeping the fire compartment closed can limit the heat release rate if the fire, limiting the potential thermal damage
true
when performing hydraulic ventilation post suppression, of the egress path (enclosed stairwell) of a multi-family dwelling is of most concern:
the ventilation opening should be made in the fire apartment, with the door to the stairwell remaining open
the presence of exterior smoke and fire upon the arrival of the fire in a multi-family dwelling is a clear indication that there are no survivable spaces within the fire compartment
false
continued cooling as the hoseline is advanced on the interior will reduce the thermal hazard for firefighters engaged in suppression and others operating in the area of the fire, including potential trapped occupants
true
the steeper the angle of the water applied through the doorway or window into the fire compartment the more the water is evenly distributed along the ceiling and side walls of the room coating more of the surfaces in their entirety
true
If you are trying to move air or smoke with a hose stream you should:
Increase the movement of the nozzle
The introduction of cool water into a fire compartment reduces temperatures, resulting in:
Gas contraction and a reduction in temperature
When identifying survivable spaces in a multi-family dwelling, areas _________ the compartment of origin and _________ in the space have the highest chance of survival.
Further from; lower
which of the following is true regarding vertical ventilation that is conducted prior to having a charged hoseline in place and ready to conduct suppression operations
vertical ventilation allows additional air to be entrained into the fire allowing it to grow and conditions to deteriorate, defeating its intended purpose
The use of a hose stream for ventilation is called:
hydraulic ventilation
The most efficient way to get a handle on a knee wall fire is to:
Control the source fire, cool the gases, and then aggressively open the knee wall to complete extinguishment
the most effective way to ensure the pressure in the fire room is lower than the pressure from the PPA in adjacent compartments is to
make the exhaust openings larger than the inlet openings
