Chapter 10 Flashcards
What should be done first when preparing to shut down a drafting operation
Slowly decrease engine speed to idle
Describes when the driver/operator is ready to operate the pump to generate sufficient pressure to create an effective fire stream?
When the fire pump has been made operational
During pumping operations, driver/operators should maintain a residual pressure on the master intake gauge
of at least 20 psi (140 kPa)
When supporting standpipe operations, fire attack crews should:
bring attack lines to initiate standpipe operations.
When shutting down a drafting operation, why should the positive displacement primer be operated for several seconds until primer oil or fluid comes out of discharge from the priming pump?
Aids in lubrication of priming pump
BEST describes when occupancies with automatic sprinkler systems should be identified?
During preincident planning
The water supply from an onboard water tank is:
the sole source of supply for many incidents.
During drafting operations, the ability to overcome losses in pressure is:
limited to atmospheric pressure at sea level.
The automatic water supply for a sprinkler system is designed to supply
only a fraction of total fire sprinklers at any given time.
Most apparatus are designed so that the procedure for making the pump operational is performed:
entirely from the cab of the vehicle.
What should be done each time nonpotable water is pumped through an apparatus
Pump and piping should be thoroughly flushed with fresh water soon afterwards.
Which of the following would be used when the driver/operator first reports to an incident location in order to size up the scene before laying a supply line?
Reverse lay
can occur when pumping at a low residual pressure while being supplied by other apparatus
Cavitation of the pump
BEST describes when it is recommended that wheels be chocked?
Every time the driver/operator exits the cab
If a sprinkler system is to be supplied at the fire department connection and no specific information is available, the general guideline is to discharge:
150 psi (1 050 kPa) into the FDC
consists of laying hose from the fire to the water source?
Reverse lay
The two basic pressurized water supply sources are a fire hydrant and:
supply hose from another pumper.
the purpose of a four-way hydrant valve in making a lay?
Allows a second arriving pumper to be connected without interrupting the flow of water to the original supply line
Which of the following is a method used to determine additional water available from a hydrant?
Squaring-the-lines method
When the pump is in operation, which of the following is a responsibility of the driver/operator?
Monitor all gauges associated with the engine as well as with the operation of the fire pump.
When a pumper is connected to a hydrant and not discharging water, pressure shown on intake gauge is:
static pressure.
If an apparatus features a vacuum-type primer, the engine rpm should be kept:
as low as possible without causing the engine to stall.
In drafting operations, the amount of friction in the intake hose is MOST affected by:
the diameter and length of the hose.
When priming the pump and beginning drafting operations, a two-stage pump:
must have the transfer valve in the parallel (volume) position
is a step the driver/operator takes when transitioning to an external water supply?
Connect supply line into an appropriate intake of the fire pump
The process of making a fire pump operational begins:
after the apparatus is properly positioned and the parking brake is set.
statements about dry pipe systems is MOST accurate?
They must be charged with water from a source such as the fire department pumper
When a pumper is discharging water, the intake gauge displays
residual pressure.
fter successfully priming the pump, the throttle setting should:
slowly be increased before attempting to open any discharges.
wet standpipe systems that contain water under pressure is MOST accurate?
They may be used as soon as the hoseline is stretched and the valve opened.
Which of the following determines the additional water available from a hydrant?
Difference between static pressure and residual pressure
After transitioning to an external water supply, the driver/operator should:
close the tank-to-pump valve.
Which is the MOST likely problem during drafting if the discharge pressure gauge begins to fluctuate with a corresponding loss of vacuum on the intake gauge?
Air is coming into the pump along with water
What should a driver/operator do immediately upon indication that the water supply or pumping ability may be unattainable or interrupted?
Notify officer or Incident Commander
Which of the following is the most common cause of an inability to prime?
An air leak that prevents primer from developing enough vacuum to successfully draft water
During drafting operations, what can occur when water is being discharged faster than it is coming into the pump?
Cavitation
Which is an indication that a pump is cavitating?
Lack of reaction on the pressure gauge to increases in the throttle
When a dry standpipe system is charged, water will be discharged:
at all points where caps are off and valve is open.
hich of the following is a characteristic of “dead end main” when referring to hydrants?
Contain higher amounts of sediment and deterioration
MOST likely scenario if a supply line that was charged suddenly loses water?
The supply line has burst.
statements about friction loss in standpipes is MOST accurate?
Generally, friction loss in a standpipe is small unless flow is very large.
If water is not flowing for an extended period of time during fire attack, why might a circulator, bypass, or booster cooling valve be opened on a pump?
To prevent the pump from overheating
MOST likely scenario if a supply line loses water but the supply line is intact?
The hydrant or water main has failed.
In general, pumps supplying a relay operation or master stream are used to supply large amounts of water, and therefore require:
use of a parallel (volume) setting of the transfer valve.
Which of the following consists of making a lay from the hydrant to the fire location?
Forward lay
To create an effective fire stream during drafting operations, a lift of no greater than _____ is recommended.
20 feet (6 m)
statements about water temperatures affecting drafting is MOST accurate?
Water temperatures may adversely impact the ability of the pump to reach capacity.
After a drafting site has been selected, which of the following is a step in connecting to the pump
Couple strainer and required lengths of intake hose and make them airtight.
When drafting, which of the following should be done when positioning the intake hose if the bottom slopes steeply from the water’s edge?
Place a roof ladder in the water and lay intake hose on it.
Which of the following is the MOST important factor in choosing a draft site?
Amount of water available
In order for a pumper to approach its rated capacity using a traditional strainer, there must be:
at least 24 inches (600 mm) of water over the strainer
statements about hydrant selection is MOST accurate?
The closest hydrants may not be the most prudent choice because of safety or fire fighting needs.
When shutting down the hydrant, why should all changes in flow be made smoothly?
To avoid water hammer and pressure surges on water systems
Which is the first consideration in establishing a drafting operation?
Site selection
If discharge flow volume is increased too much when operating from a pressurized water source:
intake pressure from the supply source may be reduced to a point that may damage the pump.
The Most Important Factor in choosing a draft site is
the amount of water available
The First Consideration in establishing a drafting operation is
site selection
a backyard swimming pool contains
12,000 gallons
low level strainers can draft water from tanks from
2 inches of water
Water temp range for drafting at capacity
35-90 degrees
A lift of 20 feet, the pump only operates at what percent of capacity
60 percent
priming pumps are most effective when running at what RPMs
1000-1200 rpms
Measuring from the surface of the water to the eye of the impeller, 1 inch or Mercury (Hg) means
1 ft of lift
