Water Distribution Test 1 study guide 100% correct answers latest 2025/2026

Water Distribution Test 1 study guide
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100% correct answers latest 2025/2026 Il`




Distribution systems are usually laid out in which of the following patterns besides Tree Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`




shaped and Grid designs?
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a. Loops and/or circular designs Il` Il` Il` Il`




b. Vertical designs without backflow prevention devices Il` Il` Il` Il` Il` Il`




c. Horizontal lines that flow into open ponds then back into a closed pipe Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`




d. Horizontal lines that flow into underground sumps then back into a closed pipe - Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`




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CORRECT ANSWER-a. Loops and/or circular designs
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Dead ends in a system are usually located on a.
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Loops and/or circular designs
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b. Tree shaped and Grid designs Il` Il` Il` Il` Il`




c. Oval designs Il` Il`




d. transmission mains Il` Il`




e. Cul de Sac's with return lines - CORRECT ANSWER-b. Tree shaped and Grid designs
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An operator may refer to Piezometric elevation, static head, or pressure head as
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a. horizontal water elevation
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b. water pressure from a pump
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c. maximum pressure from a fire hydrant
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d. vertical water column height - CORRECT ANSWER-d. vertical water column height
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A downstream closed sectionalizing valve without pressure reducing valves in the system
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will have which of the following pressures placed upon it?
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a. the water surface elevation from the last point where the water is open to the atmosphere
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b. the back pressures from a downstream point Il` Il` Il` Il` Il` Il` Il`




c. the downstream booster pump operation Il` Il` Il` Il` Il`




d. the operation of a fire hydrant located immediately downstream of the hydrant -
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CORRECT ANSWER-a. the water surface elevation from the last point where the water
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is open to the atmosphere
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What is the main purpose of a water storage facility?
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a. to allow storage reserve during wet periods
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b. to help maintain adequate pressures throughout the entire system
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c. to meet needs for fire protection Il` Il` Il` Il` Il` Il`




d. to provide sufficient amount of water to average or equalize the daily demands plus
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provide minimum pressures to fight fires - CORRECT ANSWER-d. to provide sufficient
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amount of water to average or equalize the daily demands plus provide minimum
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pressures to fight fires
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Electrical demand in a wiring system is determined by the amount of Il` Il` Il` Il` Il`

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a. Ohms in the entire system
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b. Voltage a system draws
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c. Watts consumed
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d. water pressure in the system - CORRECT ANSWER-c. Watts consumed
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Baffling inside a storage facility may be needed to prevent "hot spots" and a.
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straight through flows
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b. long contact times with disinfectants Il` Il` Il` Il` Il`




c. high chlorine residuals throughout the facility Il` Il` Il` Il` Il` Il`




d. high temperatures throughout the storage facility - CORRECT ANSWER-a. straight
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through flows Il` Il` Il`




Chlorine may be added to water in a continuous, slug, and/or the _______ method to Il` Il` Il` Il` Il`

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initially disinfect a pipeline? Il`

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a. segmented Il`

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b. tablet Il`

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c. low dose
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d. air injection - CORRECT ANSWER-b. tablet
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Wear rings in a centrifugal pump are designed to
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a. prevent excessive internal water circulation between the suction and discharge sides of Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`




a pump Il` Il` Il`




b. prevent wear of the impeller and inside case Il` Il` Il` Il` Il` Il` Il` Il`




c. allow excessive internal water circulation to occur between the suction and discharge
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d. both a & b are correct, but not c - CORRECT ANSWER-d. both a & b are correct, but not c
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Packing ring notches in a centrifugal type pump should be ______ when placed in the
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stuffing box?
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a. water tight
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b. staggered 90º
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c. made of rubber not metal
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d. heated - CORRECT ANSWER-b. staggered 90º
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Eighty parts per billion (80 ppb) is equal to which of the following? a. 8
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ppm
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b. 0.8 mg/L Il` Il`




c. 0.08 mg/L Il` Il`




d. 80 mg/L - CORRECT ANSWER-c. 0.08 mg/L
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A mass of concrete placed at bends and valve structures to prevent pipeline movement
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is commonly called a
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a. thrust block
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c. curb stop
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b. corp stop Il` Il`




d. service block - CORRECT ANSWER-a. thrust block
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What is the main difference between surface and groundwater contamination?
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a. groundwater takes longer to recover after contamination
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b. groundwaters are less susceptible to contamination
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c. surface waters take longer to recover
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