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50 Cards in this Set
- Front
- Back
The visible form of steam is called
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Condensed steam
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The total pressure lost during the travel of water through a hoze to the nozzle is.
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Friction loss
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What kind of streams discharge more than 350 GPMs?
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A Master stream
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Which type of stream is fine and composed of tiny water droplets
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A fog stream
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What kind of stream is recommended for class C fires.
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Fog nozzles with at least 100 PSI
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What kind of foam is effective against hydrocarbon fuels and polar solvents?
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Class B foam
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What form is foam in before it is exposed to water and air?
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Foam Concentrate
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What is the common expansion rate for medium expansion foam
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20:1 to 200:1
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The __________ method of pumping foam proportions foam into the fire stream at the correct ratio.
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Injection
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Which nozzle works best at distributing low expansion foam?
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Air aspirating foam nozzle
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What method of foam application is defined as dropping foam directly on-top of a fire/fuel source?
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Rain down method
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Water absorbs heat by converting it to steam, this is called. PG 718
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Vaporization
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Water freezes at? PG 719
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32 degrees F
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water turns to steam at PG 719
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212 degrees F
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At 212 degrees water expands
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1,700 times
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When the nozzle is below the fire pump, the friction?
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Decreases
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When the flow of water through a hose-line is suddenly stopped it causes a?
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Water hammer
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A low volume stream provides ______ GPM PG724
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40
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A handline stream provides PG724
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40-350 GPM
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The average PSI used on a solid bore handline
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50PSI
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Before the tip is changed on a nozzle to adjust the flow rate, you must. PG 272
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turn off the flow.
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Which fog pattern is the easiest to control?
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Wide Angle fog pattern
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What kind of nozzle allows for adjustment of flow rate while pumping?
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Manual nozzles
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What factor effects the nozzle reaction during hose usage.
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The PSI that the water is being pumped at
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What kind of stream can disrupt thermal layering and push air into a fire?
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Fog Nozzle
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What kind of nozzle are used in cellars and confined spaces
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Broken Stream
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What is the difference between a strait stream and a solid stream?
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A solid stream is produced by a smoothbore nozzle, A strait stream is produced by a fog nozzle on the narrowest setting.
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What is the name of the lever used to open a hose line?
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Bale
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What position is a ball valve in, when the nozzle is closed?
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perpendicular
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True or False, One should never lubricate a nozzle PG 733
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False
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Fire fighting foam fights fire by completing 4 seperate tasks.
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Seperating, smothering, cooling and penetrating
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Polar solvents are? PG 735
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Flammable liquids that mix with water
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What is needed to produce fire fighting foam PG 735
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water, air, mechanical agitation
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True or False, when foam is no longer visible it needs to be re-applied?
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False even though foam disipates a residual layer is still there.
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Foam proportioner is?
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The device that introduces foam concentrate to water
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Foam solution is
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Water and foam before introduction to air
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Foam
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Foam introduced to air and ready for application
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Low expansion foam has a ratio of
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less than 20:1
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High expansion foam is a ratio of PG736
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200:1 to 1000:1
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Class A foam prevents what process when applied to a fuel? PG736
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Pyrolysis
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what thickness is a foam blanket most effective at? PG 737
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4 inches
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What percent water are most foams supposed to be mixed with PG738
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94-99 percent water
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Induction Mixing is performed by
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passing a stream of water through and eductor
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Injection System
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Uses and external pump to force foam into the fire stream
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Batch Mixing
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Mixing the foam at the apparatus or portable water tank
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Premixing is sometimes done by special tanks, after use these tanks must.
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Be completely flushed before put back into service
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What kind of nozzle adds air into the foam solution to produce finished foam?
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Foam generating system nozzle
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Roll on method of foam application
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Spraying the foam at ground level from the closest to the furthest point in the fuel, completely coating it.
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What method describes using a backdrop to cover a fuel from a central location onto the source?
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Bank Down method
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During large fires the most effective rain down tactic is to
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Keep the nozzle and foam in one area where it can pile and distribute.
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