Part 2 Flashcards
To effectively judge the ability of a vehicle to pass through areas of restricted horizontal and vertical openings, you must know
Vehicle dimension
While participating in the diminishing clearance exercise, you must stop the apparatus with the front bumper within _____ inches of the finishing line
6
The purpose of the diminishing clearance driving skill is to measure a driver’s ability to
Steer apparatus in a straight line
When more than one emergency vehicle are responding along the same route, units should travel at least ______ feet apart
300-500 feet
While responding to an emergency where all lanes of traffic are blocked in the same direction, you may:
Move the apparatus into the opposing lane of traffic and proceed through the intersection at a reduced rate of speed
Studies have shown that an emergency vehicle traveling faster than ______ mph can possibly outrun the effective range of its audible warning device
50
Which is correct for safe operation and driving of aerial apparatus?
Be aware of the route’s general road and traffic conditions
These use of warning devices:
Negates some traffic laws
Many traffic accidents involving apparatus are caused by the operator
Being unaware of the vehicle potential for disaster
While responding to a call and you encounter a school bus with flashing lights, you must stop, then proceed
Only after a proper signal is given by the bus driver or police officer
During an evasive maneuver, you should
Always leave a way out
When faved with a situation requiring evasive tactics, you should attempt to pass the overtaken vehicle on
The left side
When left idling because of cold weather or floodlight operations, diesel engines should be set at:
High idle.
The purpose of an inverter on an apparatus is to transform
DC current into AC
NFPA 1901 establishes minimum requirement for forcible entry that specifically includes
Pickhead axes
The NFPA 1901 Standard requires all newer aerial apparatus to be equipped with a(an):
Two-way communication system
Which statement regarding vehicle-mounted generators is true?
They usually have a larger capacity than portable unit
Which statement regarding transmission - driven generators is true
They may provide 25,000 kilowatts or more
A disadvantage of having inverters is
Limited mobility from the vehicle
An advantage of having inverters is
Low or non-existent noise during operations
Which salvage, overhaul and loss control equipment are specifically required to be carried on an aerial by NFPA 1901?
Multiple salvage covers and two scoop shovels
While conducting a pump capacity test, if the net pump pressure is correct but the nozzle flow (gpm) is too high, the:
Discharge gate must be closed further, decreasing throttle
The 50 percent annual pump test on a quint apparatus is conducted at a net pump pressure of
250 psi for 10 min
During an annual pump test, an apparatus should deliver ____ of its rated capacity at 150 psi pump pressure for 20 mins
100%
Which condition should be between 0’F and 100’F during a service pump test?
Atmospheric temperature
A ______ gauge is designed to read both positive and negative pressure
Compound
Pumps on aerial apparatus should be hydrostatically tested at ______ psi for ______ minutes
510 psi, ten mins
Which valve determines whether the pump is operating in series or pressure mode?
Transfer valve
You should switch form pressure to volume mode when
More than half the rated capacity of the pump will be needed
An auxiliary cooling device
Cools engine water when the apparatus pump is engaged
The device that controls pressure surges by changing engine speed to compensate for changes in flow is a
Pressure governor
Switch from pressure to volume operation when
More than half of the rated capacity of the pump will be required
In a _____ hydrant, a small drain valve opens as the hydrant is closed
Dry - barrel
Excessive engine temperatures during pumping operations can be controlled by using the
Auxiliary cooler
The purpose of the _______ is to provide circulating feed from several mains
Grid system
Dry barrel hydrants should be opened completely because
The drain valve would be completely closed
In a water distribution grid, the _______ supplies individual hydrant and users
Distributor
_____ is corrosion or mineral deposits on the interior surface of the piping and components of a water distribution system
A. Encrustation
B. Sedimentation
C. Filtration
D. Hydrolyzation
A. Encrustation
Master streams requires a greater volume of water and are generally supplied by multiple hoselines with a Siamese or larger diameter hoseline, you must add ______ (psi) to your calculation for pressure loss
25 psi
The drafting sites that should be given preference are those
Accessible from a paved surface
In an auxiliary cooling system, heat is transferred from the engine coolant to the:
Pump discharge water
When making an intake connection at a hydrant, the intake hose should:
Have a slight curve
Using the condensed Q method, the friction loss in 500 feet of 3 inch fire hose flowing 300 gpm is
45 psi
P.287
When a pumper is supplying four lines of 2 1/2’ hose, each equipped with a250 gpm fog nozzle at 100 psi, and each 300 feet long, the pump discharge pressure required is approximately
138 psi
P.215, 227 ex.7.8
A fire hydrant with an orange bonnet and cap will flow ______ gpm
500-999
The water level of a reservoir is 150 feet above a fire hydrant. What is the static reading at the hydrant?
65.1 psi
The pressure remaining once water has begun flowing is _____ pressure
Residual
Natural static water supply sources include
A. lakes.
B. Cisterns
C. Swimming pools
D. Private water tanks
A. Lakes
Which best describes a wet-barrel hydrant?
Always contains water
Which best describes a DRY hydrant
Opened valve allows water to fill barrel
When pumping from a tank and attack lines are being used intermittently, the pump operator can ensure that the pump does not overheat by:
Setting the circulator valve to tank position
Available flow from hydrants is estimated by determining the percent drop between the static and _______ pressure or by the first digit method
Residual
The part of the total pressure not used to overcome friction or gravity while forcing water through fire hose, pipe, fittings, and adapters is
Residual pressure
A hydrant with the largest capacity will be one that is connected to a
Primary feeder
A fire hydrant with a GREEN bonnet and cap will flow _________ gpm.
1,000 - 1499 gpm
An apparatus equipped with a 1,000 gallon tank that is supplying two preconnected handlines, one flowing 150 gpm and another flowing 100 gpm, will supply the lines for only _____ minutes
Four
____ pressure is the difference between the pump discharge pressure and the incoming pressure from the hydrant
Net pump discharge
The operation in which each impeller of multi-stage centrifugal pump discharge into a common outlet is
Parallel pumping
The main feature of a relief valve is to
Release excessive pressure within the pump
The amount of work that a pump must do to produce a fire stream is the _____ pressure
Pump discharge
In drafting operations, pumping ability decreases when
Atmospheric pressure decreases
Prior to changing fron tank water to an extended source
Make sure all air is bled from the intake
The transition from the water tank to an external water supply:
Must be made without disrupting the fire attack
In-line relay valves allow for
Late-arriving pumpers to hook up without interrupting operations
In a relay pumping operation, which should be positioned nearest the water source?
The largest capacity pumper
A dual-pumping operation is
Placing one pumper at a hydrant and a second pumper connected intake to intake
When used in a relay pumping operation, the attack pumper
Determines the amount of water flow needed for the operation
Pump discharge pressure is equal to
NP + TPL
The residual pressure reading at the intake gauge of a pumper in a relay pumping operation should stay above ____ psi
20 psi
Relay operations are based on
Fire flow needs and distance
A mothod of relay pumping is
Constant pressure
Relay pumping always begins with the
Source/supply pumper
Relay operations should be shut down from the ______ first
Fire scene
When used in relay pumping operation, the relay pumper
Acts as the booster pump in the operation
The difference between dual pumping and tandem pumping is
Dual pumping the pumpers are connected intake to intake
When relay pumping, of the intake pressure drops below 20 psi
There is danger of a cavitation
Discharge manifolds may be used in relay operations to
Support more than one attack pumper
Fire fighting foam consist of approximately ______ percent of water
94-99.9% water
An example of polar solvent is
Acetone
When using an in-line eductor, the back pressure must not exceed ___ pressure
70 percent of the inlet
The process that causes foam concentrate to move through an in-line foam eductor and into the water stream is the ____ principle
Venturi
Which statement about foam is true?
It works by separating, cooling, or suppressing
Using an in-line eductor, the foam that is being generated is of very poor quality. Which is a common reason for the failure?
Flow through the eductor exceeds its rated capacity
The ______ is the most basic type of portable foam proportioner
In -line eductor
The foam application technique that directs the foam stream on the ground near the front edge of a burning liquid pool or spill is the
Roll-on method
Which statement must be observed when using foam?
Foam concentration is correct at the rated inlet pressure of the eductor
If the foam concentrate inlet to the educator is too high
Foam may not be inducted
The selection of a proportioner depends on
Requirements and available water pressure
When a vertical surface is near the foam application technique that can be employed is the:
Bank-down method
A limitation of Compressed Air Foam System (CAFS) is
Hose reaction can be erratic
A foam proportioner is the
Device that injects the correct amount of foam concentrate into the water
A common reason for eductor failure is
Improper cleaning and maintenance
Monitoring the water flow and controlling the speed of a positive displacement foam concentrate pump controls:
Variable flow, variable rate direct injection systems
An operational disadvantage of an around the pump foam system is
Cannot take advantage of incoming pressure
A factor to be considered when determining the rate of application for fire fighting foam is the
Type of foam concentrate used
Low-energy foam system use _______ to impart pressure on the foam solution
A fire pump
When pumping to a standpipe system, a pump operator should always allow _____ friction loss for the standpipe system
25 psi
When applying automatic sprinkler systems, pressure should be built up slowly to ______ psi at the fire department connection.
150psi
The purpose of the check valve in a fire department connection is to prevent:
Water from a sprinkler system from flowing backwhen
Positioning a pumper to supply a fire department connection, the driver must consider the:
Positioning requirements of other apparatus
Approximately ____ psi should be added to the desired engine pressure for each floor above the standpipe connection
5 psi
When using hose lines above ground level, the usual pressure calculation is to add ____ psi for each story of the building
5 psi
In a hydraulic system, the medium used to transmit force is
Hydraulic fluid
Hydraulic systems for aerial devices use relief valves to
Prevent damage due to over pressurization
The ______ valve directs hydraulic fluid from one hydraulic circuit to another
Selector
The flow of hydraulic fluid within an aerial hydraulic circuit is controlled by
Valves
