CHAPTER 15-16-20 TEST Flashcards
The primary way water extinguishes fire is by:
Absorbing heat
As water is vaporized into steam, it expands approximately _____ it’s original volume.
1700 times
A fire stream is a stream of water or extinguishing agent after it:
Leaves the fire hose nozzle until it reaches the desired target
What factor may affect a fire stream?
Wind direction and velocity
To extinguish by cooling, the fire stream must:
Absorb over 50 percent of heat generated by the fire
Which fire stream pattern is produced by a fixed orifice, smooth bore nozzle?
Solid stream
Characteristics of water that make it valuable for fire extinguishment include:
A greater heat absorbing capacity than other agents
Which nozzle produces a compact stream with little shower or spray?
Smooth bore nozzle
How may gravity, friction of air, and wind act on a solid fire stream?
They may decrease the reach of the stream
Which fire stream pattern is usually produced by a fog nozzle?
Straight stream
Hose lines are more likely to link with a smooth bore nozzle because the nozzle uses less pressure. True or false?
True
When used with a smooth bore nozzle, a nozzle control valve that causes turbulence when partially open which can affect the quality of a fire stream is the:
Ball valve
The purpose of a fire alarm system is to:
Notify building occupants of an emergency condition
Which fire alarm component sends a signal to the fire alarm control panel?
Initiating device
What is a manually activated alarm initiating device?
Pull station
A fragile bulb heat detector is activated when:
A small glass vial breaks when heated, allowing electrical contacts to complete a circuit
What type of hose transports water or other agents, at increased pressure from a pump equipped apparatus to a nozzle?
Attack hose
Which types of lugs are found on modern couplings?
Rocker
Which type of nonthreaded couplings have two hooklike lugs on each coupling?
Quarter turn
How can mechanical damage to hoselines be prevented?
Provide traffic control to prevent vehicles from driving over hose
What is an example of chemical damage to hose?
Exposure to motor oil and gasoline
How should fire hose couplings be cared for?
Inspect gaskets and replace if cracked or creased
Where might booster hose reels be mounted on the apparatus?
In rear compartments
What is an advantage of the forward lay?
Pumper can remain at the incident scene so hose and equipment are readily available
Which hose lay is used when the pumper must first go to the fire location before laying the supply line
Reverse lay
Where should the nozzle operator and members of the hose team be located?
On the same side of the hose line
When operating small hoselines with two firefighters, the backup firefighter takes a position_____.
On the same side of the hose about 3ft
Which size fire stream flows 40-350gpm
Handline stream
