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Water distribution practice test D1 -D2 Questions and Answers
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Water distribution practice test D1 -D2
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Water distribution practice test D1 -D2The only absolutely reliable method of backflow prevention is the use of - answer Air
Gap
The bubbles formed in a positive multiple tube fermentation test are - answer Carbon
Dioxide
The maximum rate of withdrawal of gas from a 150lb chlorine cylinder in 24-hours is -
answer40 lbs
If you encounter a liquid chlorine leak in a one tone container, what action should you
take first, to reduce the severity of the leak? - answerRotate the container to place the
leak at the top
The most commonly used water disinfectant in the United States is - answerChlorine
When collecting a distribution system sample, the water should be allowed to run for a
period of time prior to sample collection. How long - answerAs long as necessary to
permit cleaning of service line
Sample bottles wich are furnished by a certified laboratory for collection of
bacteriological samples - answerAre ready to use
The difference between water pressure upstream and downstream of a pump when it is
not in operations is know as the - answerTotal static head
A device that automatically shuts off flow in an elevated storage tank when the water
level in the tank reache a preset level is termed a - answerAltitude valve
In an occupied trench requiring personal egress what is the maximum allowable
distance between a worker and an exit letter - answer25 feet
A water bearing formation in the soil is referred to as - answerAn aquifer
The distance between the static water level and the pumping water level is termed the -
answerDrawdown
To prevent the entry of surface contamination into a well is the purpose of -
answerSanitary seal
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