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NFPA standard for fire apparatus engineer
1002
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When a straight stream is applied to the base of a fire in a non vented room what will it not affect
Thermal Layer
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How do you move a pool of flammable liquids with a fog nozzle
sweep
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Atmospheric pressure at sea level
14.7
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What PSI to get 70% capacity
200psi
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What tool for breaking Lexan
pick head axe
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What tool for breaking tempered glass
spring loaded center punch
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How are the wings of a revolving door collapsed
pressed together
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What method is fastest and causes least amount of damage when forcing over head doors
break panel---> lock & triangle cut
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How far apart when two or more apparatus responding
300-500 feet
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Skid control
release brakes, turn toward the skid or desired direction, do not release clutch until under control
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Braking distance and reaction time are accompanied by visual lead time
perception--> reaction--> breaking lag-->breaking distance= total breaking time
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What happens when you plunge a stream of water into a pool of flammable liquid
spreads or splashes
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What type of attack removes fuel ahead of the fire
indirect
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Weight of one cubic foot of water
62.43 pounds
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Pressure of fluid at rest
same pressure in all directions
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In the pressure setting of a dual stage pump, the water leaves the ______ of the first stage and enters the_______ of the second stage
discharge
eye
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Which primer pump is the most effective
rotary vein
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What is the hole in the oil line of the primer pump for
breaks the siphon in the line created when priming
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Injector pumps are lubricated with what
fuel
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What causes carbon build up
incomplete combustion
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How should the engine be shut down after full load operation
3 to 5 minutes
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How far and where should you park when on scene of an accident
additional apparatus should be 150-200 feet from shielding apparatus
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Which way should the wheels be turned when on scene
away from working firefighters
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How far from the hydrant should you stop when making a forward lay
10 feet
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When in a relay operation and no water is flowing, what does the attack pumper have to do
circulate the water to cool the pump
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Positive pressure does what inside a building
increases the pressure inside the building
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What is the maximum PSI when operating the transfer valve on dual stage pumps
50psi
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What is the most common problem when drafting from a static water source
loss of prime/leaks from intake
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When is the most common time to cavitate the pump
when the pressure exceeds the intake
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Primary purpose of the fire department pumper
to provide water at an adequate pressure for fire streams
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What could water coming up from the ground around a dry barrel hydrant mean
hydrant valve not closed
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Which gauge do you read to find residual pressure
Compound/Intake
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What PSI should you never go below when pumping
10psi
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How many times does water expand when converted to steam
1700 times
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Why put two full twists in a supply hose
helps prevent kinking in the hose without limiting the flow
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Types of water distribution systems
gravity, direct pumping, and combo
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Water main sizes
8/12/16 inches
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What are the final pipes in a water distribution system called
distributors
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How many gallons of water in a 4A extinguisher
5 gallons. 1.25/#
ex. 4 X 1.25=5
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What is the pressure loss for the 18th floor of a 35 story building
5 pounds per floor
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Fires in underground utility vaults
use high expansion foam
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What makes a fog nozzle a foam nozzle
air injector
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Maximum IFSTA recommended lay with 2 ½” or 3” hose
200 psi (relay pumping)
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What is flow pressure measured with
pitot gauge
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The difference of the pressure at a hydrant and the pressure at the pump is a good example of what
friction loss
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How long should pumps 1250 GPM and larger take to prime
10-15 seconds, but not longer than 30 seconds
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How much does one gallon of water weigh
8.34lbs
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Water enters what part of the pump
the eye
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What is the purpose of the primer pump
remove air from the pump
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What color is the smoke for a potential back draft
yellow/grey
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Heat transfer inside of a building is primarily which type
convection
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How do you reduce friction loss when critical velocity is reached
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What gauge do you read to find velocity pressure
discharge
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What PSI for smooth bore master stream
80psi
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An automatic nozzle will maintain what PSI
100psi
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What PSI for fog nozzles
100psi
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What is the force that pushes back against the firefighter when flowing water called
nozzle reaction
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What type of priming pump compensates for wear
rotary vein
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When impeller speed doubles, PSI increased how much
4 times
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What PSI to produce maximum GPM
150psi provides pump capacity
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What happens to friction loss when PSI is increased
increases at an exponential rate
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What is the maximum amount of vacuum a pump can draw
22 inches of mercury
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Pumpers are designed to pump capacity at a maximum of what lift
10 feet
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What is the process of raising water from a static source called
drafting
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How many feet of lift if the gauge reads 8 inches of mercury
9.2
-2psi = 4 inches of mercury on intake gauge resulting in 4.6 feet of lift
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The maximum capacity of a relay operation is determined by what
the smallest operating pump
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What is theoretical lift?
33.8 feet
not possible with fire dept pumpers because total vacuum not possible
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Pumpers are designed to pump capacity at a maximum of how much lift
10 feet
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Theoretical lift at sea level is 33 feet, what would the lift be at 3000 feet
- 14.7-1.5=13.2
- 13.2 X 2.3ft/psi= 30.36
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What PSI to get 1000 GPM out of the ladder
165psi
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Can you get water to the pump via the inlet/outlets on T12 (why)
yes, close wheel valve and open the aerial discharge
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What is the PSI loss for standpipes
25 lbs + 5 lbs per floor + hose lay friction loss + nozzle pressure = discharge pressure
not to exceed 200 psi
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How long is the ladder on T12
42 feet ladder + 8 feet height of truck = 50ft.
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What kind of pump is on T12
single stage centrifugal pump
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Describe how the relief valve on T12 works
allows excess pressure to flow back to tank
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When hooked up to an FDC, what PSI do you pump at (why)
150psi. It delivers pump capacity
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What is the difference between a Class A and a Class B pumper
- Class A
- 100% @ 150psi
- 70% @ 200psi
- 50% @ 250psi
- Class B
- 100% @ 120psi
- 70% @ 200psi
- 50% @ 250psi
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What is the GPM formula
29.7(D2 sq root NP)
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How many gallons of water in 1 ton
1 gallon of water =~ 8.345 lbs 2000 lbs / 8.345 lbs/gal = 239.65 gal
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What is the tip load for 45-75 degrees while flowing 1000 GPM
300lbs
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What GPM will you get with a 1” tip at 50 PSI nozzle pressure
210 gpm
29.7 x 1 x 7.07
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How many gallons of water in a cubic foot?
7.48 gallons in cubic foot
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NFPA standard for fire apparatus
1901
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psi for smooth bore hand line
50psi
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Atmospheric Pressure
14.7
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