Water distribution 1 practice test review latest guide Q&A 2025/2026

Water distribution 1 practice test review
latest guide Q&A 2025/2026
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The only absolutely reliable method of backflow prevention is the use of - CORRECT
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ANSWER-Air Gap
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The bubbles formed in a positive multiple tube fermentation test are - CORRECT
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ANSWER-Carbon Dioxide
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The maximum rate of withdrawal of gas from a 150lb chlorine cylinder in 24-hours is -
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CORRECT ANSWER-40 lbs
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If you encounter a liquid chlorine leak in a one tone container, what action should you
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take first, to reduce the severity of the leak? - CORRECT ANSWER-Rotate the
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container to place the leak at the top
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The most commonly used water disinfectant in the United States is - CORRECT
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ANSWER-Chlorine
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When collecting a distribution system sample, the water should be allowed to run for a
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period of time prior to sample collection. How long - CORRECT ANSWER-As long as
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necessary to permit cleaning of service line
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Sample bottles wich are furnished by a certified laboratory for collection of Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`

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bacteriological samples - CORRECT ANSWER-Are ready to use
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The difference between water pressure upstream and downstream of a pump when it is
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not in operations is know as the - CORRECT ANSWER-Total static head
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A device that automatically shuts off flow in an elevated storage tank when the water
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level in the tank reache a preset level is termed a - CORRECT ANSWER-Altitude valve
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In an occupied trench requiring personal egress what is the maximum allowable
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distance between a worker and an exit letter - CORRECT ANSWER-25 feet
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A water bearing formation in the soil is referred to as - CORRECT ANSWER-An aquifer
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The distance between the static water level and the pumping water level is termed the -
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CORRECT ANSWER-Drawdown
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To prevent the entry of surface contamination into a well is the purpose of - CORRECT
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ANSWER-Sanitary seal Il`




The presence of coliform bacteria in a distribution system - CORRECT ANSWER-
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Indicates that pathogenic organisms may be present also
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The most common valve type in water distribution system is the - CORRECT ANSWER-
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Gate valve
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A Venturi is a device used to - CORRECT ANSWER-Measure water flow
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Backspin is occurring after well shut down this indicates - CORRECT ANSWER-A faulty Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`