Chapter 8 - Fireground Hydraulic Calculations Flashcards
The number displayed by a flowmeter reflects water pressure that will be discharged through the nozzle if the hoseline is:
functioning at its rated capacity.
page 282
The condensed Q method formula cannot be used with _____ measurements
metric
page 287
When making initial calculations for a customized pump chart, ensure the length of the wyed hoseline layout is the distance between
the pumper and they wye.
page 285
The gpm flowing method is not applicable to the _____ system of measurement.
metric
page 288
With the proper calibration, a flowmeter should be accurate to a tolerance of plus or minus:
3 percent
page 282
Which type of flowmeter has only one simple moving part and therefore tends to require little maintenance?
Spring probe
page 282
When a line is shut down during standpipe operations and the driver/operator is operating an apparatus equipped with a flowmeter, the driver/operator should:
lower the pressure accordingly.
page 283
What effect will a kink or a partially closed valve in the hose layout have on the flowmeter?
Will cause the flowmeter to register a change in the meter’s reading
page 283
Which is most likely to be the cause if a driver/operator receives a message from an attack team that the volume of water at the nozzle has suddenly decreased without a corresponding change at the flowmeter?
A hoseline may have burst.
page 283
pump charts contain information specific to:
a jurisdiction’s equipment and common hose layout operations.
page 284
Each discharge equipped with a flowmeter must have a digital readout display mounted within:
6 inches (150 mm) of the control valve for that discharge.
page 282
flowmeters are useful in relay pumping operations because the driver/operator may feed a supply line without having to know:
the volume of water flowing from the receiving pumper.
See page 283
Which type of flowmeter is mounted at the top of a straight section of discharge pipe so that only a small portion of the device extends into the waterway?
Paddlewheel
page 282
The condensed Q formula FL = Q2 is used with:
3-inch hose.
page 287
For electronic hydraulic calculators, once variables have been entered, the calculator applies ____________________ to arrive at pump discharge pressure.
page 284
preprogrammed formulas
Which type of flowmeter employs a stainless steel spring probe to detect water movement in discharge piping?
Spring probe
page 282
The gpm flowing method may be used for:
various diameter hose.
page 288
When developing a customized pump chart, column headings should include information such as flow, nozzle pressure, and:
distance in feet for hose layouts.
page 284
The condensed Q formula may be used for operations in which the friction loss can be determined for __ inch hose
3, 4, or 5-inch hose.
page 287
A guideline when developing a customized pump chart is to round pump discharge pressure calculations to the nearest __ psi
5 psi (35 kPa).
page 285
Which type of flowmeter uses a sensor to measure the speed at which it spins and translates the information into a flow measurement?
Paddlewheel
page 282
Using the condensed Q formula for 5-inch hose, what is Q2 divided by?
15
page 288
When a line from a standpipe operation is shut down, the pressure must be lowered accordingly, or the standpipe system will attempt to:
flow excess water through remaining hoselines.
page 283
The gpm flowing method is applicable to:
both solid and fog streams.
page 288
Flowmeters are especially advantageous when automatic nozzles are employed because automatic nozzles may lead driver/operators to:
supply insufficient discharge pressures, creating a low gallon (liter) per minute flow.
page 282
flowmeters relieve you from relying on calculations based on friction loss, elevation pressure, and:
length of hoseline.
page 282
The driver/operator must consider that when a standpipe or hoseline is charged, there is no flow through the system or hose layout until:
the nozzle is opened.
page 284
Using the condensed Q formula, what is the total pressure loss in 500 feet of 4-inch hose flowing 1,000 gallons per minute?
100 psi
page 288
Electronic hydraulic calculators may be handheld or may be:
permanently affixed near the pump operator’s panel
page 284
manual hydraulic calculators consist of a ____ or ____ that can be moved to cover or reveal rates of flow, size of hose, and length of hose layout
slide or dial
page 284
When developing a customized pump chart include ___________ for master stream appliances.
friction loss
page 284
