Chapter 16 A
Rebar (steel reinforcement bars)
steel begins to lose its strength around what temperature?
570 F
Which passenger safety system includes pretensioners that present a significant ignition hazard?
Seat belts
what is the first step of a vehicle extrication operations?
size up the incident scene
What should be done to ppe at incidents using foam?
Field Decontamination
Why are pressurized vessels that contain flammable or combustible contents distinguishable at an emergency scene?
Placards or stickers
decorative covers for wood or metal, or concrete-block, brick, or stone load-bearing walls are called what
veneered walls
Safest location for defensive operation when a collapse zone has been established?
At the corner of the building
Firefighters who are working on or near a roadway must wear _______, even if they are not engaged in fire suppression or extrication
retroreflective vest
Extrication should not be attempted until what has been completed on the vehicle?
Fully stabilized
Through what method is a foam solution educted during firefighting operations?
Venturi effect
What types of liquid fuels is Class B foam effective on?
hydrocarbon fuels and Polar solvents
What are the two ways that steel I-beam are affected by fire
Elongation
Buckling
Which construction type has unprotected steel or noncombustible supports
Type II
Which saw has a straight blade that moves in and out? highly controllable , versatile and powerful
Reciprocating saw
What action should be taken any time an incident involves energized power lines?
Call the electric company to respond
Class b foams are mixed in proportions of what percents?
1-6
what are the methods of foam application:
roll-on, bank -down and rain -down
used for insulation located between interior / exterior walls and ceilings/ roof area.
Fiberglass
during which stage of a fire is a collapse likely due to the weakened state of structural members and the buildup of water
Decay
What is the dangerous hydraulic effect created below a low-head dam—also known as a hydraulic or drowning machine—that can trap and pull victims underwater during a water rescue?
Undertow
What is the primary hazard at any motor vehicle accident?
Traffic
Which elements must be blended in the correct ration to produce finished foam?
Foam concentration, water and air
what does LPG, LNG and CNG stand for?
Compressed natural gas (CNG)
Liquefied Petroleum Gas (LPG)
Liquid Natural Gas (LNG)
an inorganic product from which plaster and wallboards are constructed also know as Dry wall or Sheetrock
Gypsum
what must be established when a defensive strategy has been adopted?
What is a safety rule when using pneumatic lifting bags?
Never inflate a device without a load
What should be stabilized to prevent airbag deployment or other ignition sources from activating during a rescue?
vehicle batteries
What type of foam proportioner in built into the nozzle and is not a versatile?
foam nozzle eductors
How can the sound of gas escaping from a relief valve indicate that a container is overheating and a rupture may be imminent?
the sound gets louder
Do to it high moisture content this wood does not ignite as readily nor burns as fast
green wood
The following are all signs of what:
noise caused by structural movement
deteriorated mortar between the masonry
movement in the roof, or floors
structural instability or collapse
Trench rescue
What type of accident can often require displacing the dashboard?
front-end collisions
what are 4 ways that foam extinguishes and /or prevents ignitions?
Separating
cooling
smothering
penetrating
what should be consulted for hazard information about any specific foam concentrate?
Safety Data sheets