Class Notes Flashcards by Drew Maenhout

What is a quint?

Apparatus equipped with an aerial device, ground ladders, and fire pump, water tank and fire hose

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What component is a step up transformer that converts the vehicles 12 or 24 volt DC current into 110 or 220 volt AC current

Inverter

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What component turns various lights on at specified intervals so that the start up electrical load for all the devices don’t occur at the same time?

Load sequencer

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What component watches the system for added electric load that threaten to overload system?

Load monitor

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What is it called when the load monitor will shut down less important electrical equipment to prevent the overload

Load shedding

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Steering wheel play should be no more than ______

10 degrees in either direction

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NFPA braking test requirements

Complete stop from 20 mph in no more than 35 feet. Parking brake must hold apparatus on a grade of 20%

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Air pressure should build to a sufficient level to allow driving within _____ of starting.

60 seconds

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You might not be able to operator the air horn if the air reservoir drops below _____ because of the air pressure protection valve

80 psi

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Condition that occurs when the throttle is applied while the transmission is in too high a gear for a given set of conditions

Lugging

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Choose a gear that allows the engine to operate between _______ rpm

200 and 300 rpm.

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Long idling periods can result in the use of ______ of fuel per hour

1/2 gallon

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NFPA _____ states that all riders must be seated and belted, unless loading hose, providing patient care, or teaching tractor drawn aerial

1500

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The sum of the driver’s reaction time distance and the vehicles braking distance.

Total stopping distance

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The distance a vehicle travels while a driver is transferring the foot from the accelerator to the brake pedal after perceiving the need for stopping.

Reaction distance

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The distance the vehicle travels from the time the brakes are applied until the apparatus comes to a compete stop.

Braking distance

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It takes ______ more distance for a vehicle to come to a complete stop on snow and ice than dry concrete.

3 to 15 times

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At speeds above ____ an emergency vehicle may outrun the effective range of its audible warning device

50 mph

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Vehicles moving at _____ can project 300 feet in front of the vehicle. At a speed of 60 mph however the siren is only audible 12 feet

40 mph

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______ staging may be used on an emergency response where two or more companies are dispatched. Hearing this order, other responding units stage at least one block away form the scene in the direction of travel and await further orders

Level 1

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____ staging is used where a large number of emergency vehicles are responding to the same incident. This staging is initiated by the IC.

Level 2

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The measure of the heat absorbing capacity of a substance.

Specific heat

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Pressure is defined as ______

Force per unit area

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A one square inch column of water one foot high therefore exerts a pressure at its base of _____

.434 psi

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_____ feet of water column exerts a pressure of 1 psi at its base

2.304 feet (1 divided by .434)

At sea level, the atmosphere exerts a pressure of ______

14.7 psi

Absolute zero is also called _____

A perfect vacuum

____ in the fire service refers to the height of water supply above the discharge orifice.

Head

_____ is the forward velocity pressure at a discharge opening when water is flowing

Flow pressure

In residential areas the recommended size for a fire hydrant supply main is at least _____ in diameter.

In business and industrial the minimum size for fire hydrant supply main is ___ in diameter.

The maximum amount of water used in any one hour interval over the course of the day

Peak hourly consumption

The max total amount of water that was used during any 24 hour interval within a 3 year period

Maximum daily consumption

This type of pump does not use positive action/positive displacement to force water from the pump; rather it depends on the velocity of the water produced by the centrifugal force to provide the necessary pump discharge pressure for effective operations

Centrifugal pump

These types of pumps are used as priming devices to get water into centrifugal pumps

Positive displacement pumps

Type of positive displacement pump commonly used in hydraulic systems. The pump imparts pressure on the hydraulic fluid by having two intermeshing rotary gears that force the supply of hydraulic oil into the pump casing chamber

Rotary gear pump

The major components of a centrifugal pump

Impeller, vanes, shroud, volute, casing, eye, hub, stripping edge, and discharge

Spiral, divergent chamber of a centrifugal pump in which the velocity energy given to water by the impeller blades is converted into pressure

Volute

The max net pump discharge pressure at which the transfer valve should be operated will not exceed ____

50 psi

On a 2-stage pump, if unknown which mode to operate in, you should operate in ____ because _____.

Parallel/volume because it can supply 100 percent of the rated volume capacity at 150 psi at draft

The piping system must be able to withstand a hydrostatic test of _____.

500 psi

Tank fill line must be _____ in diameter

1" minimum

NFPA 1901 requires all valves on intake or discharge that are _____ or greater to be equipped with slow acting valve controls, this prevents movement from the full open to the full closed positions in less than 3 seconds

This component provides a relative indication of battery condition and alternator output

Voltmeter

If a pump will be required to use more than _____ it should be set to parallel/volume

50% of its rated capacity

The maximum amount of vacuum that most pumps develop is approx. _____

22 inches

The best indicator of cavitation is _____

The lack of reaction on the pressure gauge to changes in the setting of the throttle

At 20 feet of lift the amount of water that can be supplied is only about ____ of its rated capacity.

60%

Which setting on a 2-stage pump should you be in for drafting?

Parallel/volume

At 15 feet of lift the amount of water that can be supplied is only about ____ of its rated capacity.

70%

NFPA 1901 requires all tenders to be able to dump at a minimum average flow rate of ______

1000 gpm for the first 90% of their tank

The foam concentrate inlet to the edcutor should not be more than _____ above the liquid.

6 feet

Engine must accelerate to ____ from a standing start within _____ and must achieve a top speed of _____.

35 mph; 25 seconds, 50 mph

Engine must come to a stop from 20 mph within _____

35 feet

Pump is tested at 150 for ____ minutes; 200 for ____ min which is 70% capacity, and 250 for ____ which is 50% capacity

20; 10; 10

NFPA minimum pump capacity for an engine

750 gpm @ 150 psi

NFPA minimum pump capacity for a tender

250 gpm @ 150 psi

2 reasons to prime above 1000 rpm

It primes faster and it's less load on the electrical system

When not to prime?

If getting a supply. Only have to prime if pumping from the tank

Minimum tire tread depth

1/8" on steering axle tires, 1/16" on rolling axles

Where does most of the breaking capability occur?

80% in the front disc brakes

How much of the braking does the engine brake handle?

85%

What does the green brake do?

It will get you off the road by pulling the remaining air in the system to the spring brakes if the brakes have locked up. Must hold it down.

Maximum GPM in standpipe

500 gpm

GPM of sprinkler head

20 gpm

When pumping a sprinkler FDC, how do you know if you're flowing water?

Gate down and if water is flowing the pressure will drop. If no water is flowing the pressure will hold.

PDP for a building with fire pumps

10 psi less than rating of fire pump

Explanation of friction loss for aerial master stream

185 psi (100 psi tip, 25 psi for ladder pipe (treat as a standpipe), 40 psi elevation (80'), 20 psi pipe FL)

What psi is attack hose tested at?

300 psi (max PDP should be 250)

What psi is supply hose tested at?

200 psi (max PDP should be 180)

When would you consider a relay pumping operation over a water shuttle?

If NFF exceeds 300 gpm

Phrase to explain dual pumping

"Putting the water main above ground"

What size hose would you use on a tank transfer?

2 1/2" hose to preserve water

Water comes into the ___ of the pump, then gets spun through the _____ in the _____ and then thrown through the _____ to the discharge

Eye; Vanes; Impeller; Volutes

Minimum gpm Tank to Pump must provide

500 gpm

All pump components and piping is rated to a minimum of ____

500 psi

What is the size of the Tank to Pump line?

2 1/2"-3"

What is the size of the Tank Fill line?

About 1"

When would you be in RPM mode as opposed to pressure mode?

RPM for relay pumping (relay, tandem, supply ladder) or drafting

How do you know you’re at your maximum volume you can pump based on the hydrant supply?

No more intake pressure OR | You throttle up and your master gauge doesn’t increase

What type of foam is Novacool?

Universal Extinguishing Agent; Class A/B foam

What types of fires can Novacool be used on?

Class A, B, D, or K fires

Proportioning for Novacool

Overhaul: 0.1% | Fire Attack: 0.4%.

3/2/1 rule of foam eductors

200 psi to eductor, 100 GPM eductor, 300’ max eductor to nozzle

Drop 10 rule for 2 1/2" hose friction loss

Drop the last digit of GPM, subtract 10, gives FL per 100'. | Example: 2 ½” w/ 300 GPM (300=30, 30-10 = 20 psi per 100’)