Chapter 9 Quiz Flashcards
Operate using a piston that moves back and fourth in a cylinder
Piston pumps
Consists of two gears that rotate in a tightly meshed pattern inside a water tight case
Rotary gear pumps
Nearly all modern fire apparatus feature a ____ as their main pump
Centrifugal pump
In a centrifugal pump the capacity of the pump is dictated by the size of the
Impeller
If there is any question as to the correct position for the transfer valve, it is best to operate in ______ rather series
Parallel
To restore the pumping capacity without replacing the entire pump, _________ in the pump casing may be replaced to maintain the preferred spacing between the hub of the impeller and the pump casing.
Water rings or clearance rings
Some manufacturers offer a ______ design that is driven off the engines fly wheel
Rear engine PTO
Some fire department pumpers feature an extended front bumper with a pump mounted between the bumper and the grill of the vehicle
Front mounted pump
Most fire department operate pumpers that feature the pump mounted laterally across the frame behind the engine and transmission
Mid ship pumps
In order to minimize pressure loss within the apparatus all piping and hoses must be designed to run a straight as possible
With minimum bends and turns
When multiple attack lines that require different pressures are being operated the driver must set the engine discharge pressure to the
Highest pressure
Is essential to ensure the safety and effectiveness of personnel operating hose lines
Automatic pressure regulation
Are intended to reduce the possibility of damage to the pump and discharge hose lines caused by water hammer when valves or nozzles are close to quickly
Intake pressure relief valve
Is needed to create a vacuum that makes drafting possible
Priming device
In order to prime the pump a line is connected from the intake manifold of the engine to the intake of the fire pump with a valve connected in the line to control it
Vacuum primer
