Chapter 10 - Operating Fire Pumps Flashcards
Which of the following is used to prevent the pump from overheating during fire attack if water is not flowing for an extended period of time?
Booster cooling valve
page 338
An inability to prime is most likely caused by:
insufficient fluid in the priming reservoir.
page 359
For most apparatus, from what location is the procedure for making the pump operational performed?
Cab of the vehicle
page 336
One indication that a pump is cavitating is that:
the pump itself may make noises described as sounding like gravel passing through the pump.
page 354
What should be done if priming has not been achieved within the acceptable time period for a particular situation?
Priming attempt should be stopped and the problem traced
page 359
When is residual pressure shown on the intake gauge of a pumper that is connected to a hydrant?
When a pumper is discharging water
page 347
Which of the following standpipe systems must be charged wtih water from a source such as the fire department pumper?
Dry pipe systems
page 364
What residual pressure should be maintained on the master intake gauge during pumping operations when operating from a pressurized supply source?
At least 20 psi (140 kPa)
page 340
Where is a driver/operator most likely to find suggested discharge pressures for a sprinkler system?
Printed on a plate at the FDC
page 363
During drafting operations, the ability to overcome losses in pressure is limited to:
atmospheric pressure at sea level
page 352
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
page 339
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
page 362
When a dry standpipe system is charged, water will be discharged at all points where:
caps are off and valve is open.
page 365
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
page 346
What is most likely the 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
page 360
What is the most common cause of an inability to prime?
An air leak
The water supply from an onboard water tank is:
the sole source of supply for many incidents
page 336
It is recommended that wheels be chocked:
every time the driver/operator exits the cab
page 336
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 _____ into the FDC.
150 psi (1 050 kPa)
page 363
Which is a characteristic of “dead end mains” when referring to hydrants?
Contain higher amounts of sediment and deterioration
page 340
If an apparatus features a vacuum-type primer, the engine rpm should be kept:
as low as possible without causing the engine to stall.
page 359
What is 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
page 341
The two basic pressurized water supply sources are a fire hydrant and:
a supply hose from another pumper
page 339
In order for a pumper to approach its rated capacity using a traditional strainer, there must be at least _____ of water over the strainer.
24 inches (600 mm)
page 355
Which is the most IMPORTANT factor in choosing a draft site?
Amount of water available
page 355
Which determines the additional water available from a hydrant?
Difference between static pressure and residual pressure
Friction loss in standpipes is generally:
small unless flow is very large.
The automatic water supply for a sprinkler system is designed to supply:
only a fraction of total fire sprinklers at any given time.
page 362
The closest hydrants may not be the most prudent choice because of:
safety or fire fighting needs
page 340
To create an effective fire stream during drafting operations, a lift of no greater than _____ is recommended
20 feet (6 m)
page 357
What can occur when pumping at a low residual pressure while being supplied by other apparatus?
Cavitation of the pump
page 339
