Exam (elaborations)
Water DISTRIBUTION GUIDE QUESTIONS AND ANSWERS 2024
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Water DISTRIBUTION GUIDE
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Water DISTRIBUTION GUIDEIf you come upon a co-worker who is not breathing, you should immediately - answer
Start artificial respiration
A connection from the municipal water supply directly to the packing gland of a
centrifugal wastewater pump - answer is a hazard to the safety of the potable water
supply
A waterborne disease that can be transferred to humans if proper disinfection is not
provided is - answer Typhoid
Rising stem valves are most often used - answer in a pumping station
The device used to check water flow to consumers is a - answer Water meter
Which one of the following types of meters has NO MOVING parts - answer Venturi
Distribution system pressure should not be allowed to drop below ___ PSI - answer20
To determine whether an intersecting sewer line crosses over or under a water main,
one would look at the - answer Elevation view
The chlorine residual in water may be determined using the reagent - answer Diethyl-p-
phenylenediamine (DPD)
Customer services are most commonly metered with ___ meters - answer Positive
displacement
A toxic substance is always - answer poisonous
The primary reason for a dry barrel fire hydrant is to - answer keep the hydrant from
freezing
The rotating element in a centrifugal pump is commonly called - answer an impeller
First aid for 1st degree burn - answer submerge the burned area in cold water
what info has to be on a lock out tag in use? - answer signature of the person who
locked it out
killing of pathogenic organisms is called - answer disinfection
, Temporary cloudiness in freshly drawn samples of tap water may be caused by -
answer air
Vent openings on reservoirs and storage tanks should be - answer screened
Firefighting may cause low pressure in an area of a distribution system. The low
pressure might lead to - answer contamination of the system by back-siphonage
Hydrogen Sulfide (H2S) smells like - answer rotten eggs
When driving a company vehicle - answer follow the same traffic laws as everyone else
When using chlorine tablets to disinfect pipelines, its best to place the tablets - answer
on the inside top
a connection between a safe and an unsafe water supply is called a - answer cross
connection
velocity of flow in mains is usually expressed in terms of - answer feet per second (FPS)
When opening and closing valves in high pressure lines, the valves should be opened
and closed ___ - answer Slowey
Pressure is usually measured in - answer pounds per square inch (PSI)
a water main should be disinfected - answer After the pipe is laid in place.
A new section of water main has just been laid. Before it is completely back-filled and
put into service, several thing must be done. What is the correct order for doing them? -
answer pressure test, flush, disinfect, flush, collect bacti samples
samples taken for routine analysis should be preserved by ___ - answer refrigerating
what is HYDRANT BURY? - answer vertical distance between the ground and the
bottom of the hydrant branch or pipe connection
An aquifer is ________. - answer A water-bearing stratum of rock, sand, or gravel
the difference between the static level and the pumping level of a well is called - answer
Drawdown
The carrying capacity of water mains is often reduced by ___ - answer tuberculation
When installing service lines, it is a good practice to provide for movement due to
settling by installing a ___ - answer bend or gooseneck in the pipe
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