Ch.10 Flashcards
The entire priming action typically requires ___ to ___ seconds from start to finish ?
10 to 15 seconds
Most pumps are able to develop a vacuum capacity of approximately ____ inches of mercury?
22 inches
To create an effective fire stream , a lift of no greater than ____ feet is recommended?
20 feet
Effect of altering the atmospheric pressure within a confined space by mechanical means?
Pressure differential
Pumper that is positioned at the fire scene and directly supplying attack lines?
Attack pumper
Pumper that takes water from a source and send it to attack pumpers operating at the fire scene?
Water supply pumper
A pumper and good working order can lift water a maximum of_____feet?
25 feet
All fire pumps meeting NFPA and underwriters lab Inc. requirements are rated to pump their capacity at____ feet of lift ?
10 feet
Water below____ Or above _____ may adversely impact the ability of the pump to reach capacity?
35°F
90°F
Each time the flow rate is _________ , the pressure drop in the system is _________?

Doubled
Quadrupled
Do you not use discharge pressures in excess of_____ psi , Unless the standpipe system, hose and appliances have been designed to function under high-pressure?
185 psi
Typically the least desirable hydrants are those located on ____________ that are served by smaller mains from only one direction?
Dead end mains
One of the most common ways for a pumper to be supplied with water from a hydrant is by making a ________________?
Forward hose lay
Some depts use a ______ hydrant valve to aid the process of making a forward lay?
4 way hydrant valve
Load the hose with a male coupling to come out of the bed first when using hose with threaded couplings for a _________ hose lay?
Reverse hose lay
Executing a reverse lay is a common method for setting up a water supply operation using ____________ as a supply line ?
Medium diameter hose
The __________ lay is the most direct method of supplementing hydrant pressure or performing drafting operations ?
Reverse lay
The _______ of water is an additional factor in friction loss ?
Inertia
The amount of friction loss is ____________ to the amount of water moving through it?
Proportional
In theory ___________ can be described as water being discharged faster than it is coming into the pump?
Cavitation
Although cavitation can occur when operating from a hydrant system , it often occurs during _________ operations ?
Drafting
Priming the pump for drafting operations for two stage pumps , the transfer valve must be _______ position (mode)?
Parallel (volume ) mode
During a failed priming action , the most common cause of an air leak is an ________ or ______?
Open drain or valve
While the pump is operating , a gradual increase in the vacuum may be noted with no change in the flow rate, this is an indication that a _________ is developing?
Blockage
