Water distribution system operation and maintenance test review questions with verified detailed answers

Water distribution system operation and maintenance test
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review questions with verified detailed answers || || || || ||




What is the purpose of water distribution systems? - ✔✔To deliver adequate quantities of
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water at sufficient pressure at all times under continually changing conditions while at the
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same time protecting water quality
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What is the purpose of vacuum, pressure-relief, and pressure-reducing valves? - ✔✔To
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prevent pipe damage from negative or excessively high pressures
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Under what conditions is the solid-sheeting shoring method used? When it is necessary to -
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✔✔excavate in materials that will not stand in a vertical position
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When making pipe extensions, why are wet taps preferred over dry taps? - ✔✔Because any
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time the pressure in a pipeline is removed, contamination may more easily enter that line
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What problem can occur when air gets into the water in a pipeline and the air collects
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forming pockets of air? - ✔✔Air pockets can increase the resistance to flow or stop the flow
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of water completely
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What is the advantage of the Venturi type of water meter? - ✔✔extremely accurate at low
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flows



What could be the source of supply for a water distribution system? - ✔✔Purchased water
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connection, wells, treatment plant clear well || || || || ||




Water distribution system mains are laid out in what types of systems? - ✔✔Grid, loop,
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tree(branching)

, What are the basic requirements of pipes for water distribution systems? - ✔✔Adequate
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strength, durability, maximum corrosion resistance, no adverse effect on water quality
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What type of shores have been tested and approved by OSHA? - ✔✔Air shores, cylinder
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shoring, hydraulic shores, screw jacks, solid sheeting
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Drinking water quality standards cover all potential chemicals that could enter a water
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supply. True or False - ✔✔False
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Coliform bacteria are considered pathogenic organisms. True or False - ✔✔False
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Chloramines are considered a more powerful disinfectant than chlorine. True or False -
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✔✔False



What does the term "water quality" mean? - ✔✔The composite chemical, physical, and
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biological characteristics of a water supply
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What are organics? - ✔✔Chemical substances that are based on element carbon
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What are slimes? - ✔✔Organic substances of a viscous nature formed from microbiological
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growth



What conditions in water main dead ends can produce carbon dioxide, methane, and foul
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sulfide odors? - ✔✔Anaerobic
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A domestic water supply is considered to be of good quality when it meets which criteria? -
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✔✔Attractive taste and appearance, free of disease causing organisms, free of toxic
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