Water Distribution level 1 study test final exam with correct solutions

Water Distribution level 1 study test final
exam with correct solutions
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Chlorination is the most common means of disinfection used today to protect the Il` Il` Il` Il` Il` Il` Il`

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public's health - CORRECT ANSWER-True
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As water mains and reservoirs become older, they require less and less maintenance. -
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CORRECT ANSWER-False
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Routine water quality monitoring of distribution systems consists of collecting samples
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at remote locations in the system and testing for chlorine residual and coli forms -
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CORRECT ANSWER-True
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Existing contaminant limits mar be modified is EPA's ongoing research reveals new
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information about the effects of a particular substance - CORRECT ANSWER-True
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Reservoirs that are not heavily used can be a source of taste, odor, and contamination Il` Il` Il` Il` Il` Il`

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problems - CORRECT ANSWER-True
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When someone contacts you complaining that their drinking water looks muddy, taste
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bad, or smells bad, you need not be concerned. - CORRECT ANSWER-False
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The lack of circulation in a dead end creates nearly ideal conditions for degrading water
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quality - CORRECT ANSWER-True
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Ground waters are more susceptible to contamination than surface waters. - CORRECT
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ANSWER-False
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A water supply that us satisfactory in quality for one purpose might be entirely
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unsatisfactory for another - CORRECT ANSWER-True
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Chloramines are considered a more powerful disinfectant than chlorine. - CORRECT Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`

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ANSWER-False
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Under what conditions may water mains be located adjacent to sewer lines? - CORRECT
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ANSWER-When physical conditions or soil conditions prevent minimum separation
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distances from being met
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How can corrosion be prevented on the insides of cement or metal pipes? - CORRECT
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ANSWER-Line with asphalt or coal tar coatings
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What influences the knowledge and skills required to work as a water distribution system
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operator in a given system? - CORRECT ANSWER-The size and type of water distribution
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system
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What are organics? - CORRECT ANSWER-Chemical substances that are based on the
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element carbon
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Why are chloramines more effective against biofilms than chlorine? - CORRECT
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ANSWER-More persistent
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, Why have drinking water quality standards been prepared and used? - CORRECT
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ANSWER-Tp provide the needed quality control and ensure the acceptability of the
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product
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Why is water quality monitoring of distribution systems important? - CORRECT ANSWER-
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to identify when and where water quality changes occur in the system.
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When water lines are being repaired, how can possible contamination of the water line
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be prevented? - CORRECT ANSWER-Keep the hole dewatered
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What are pathogens? - CORRECT ANSWER-disease causing organisms
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What is the primary responsibility of a water treatment plant? - CORRECT ANSWER-to
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produce a safe and palatable water
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What is considered the greatest water quality nuisance? - CORRECT ANSWER-
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Corrosion and precipitation of iron
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What types of consumer complaints can result from hydrant testing and flushing
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programs? - CORRECT ANSWER-Dirty water complaints
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What is the purpose of adequate and reliable records? - CORRECT ANSWER-To
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document the effectiveness of the operation
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What is every operators responsibility with regard to safety? - CORRECT ANSWER-Be
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sure that the facilities are a safe place to work and that everyone follows safe
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procedures
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What should you do after investigating a drinking water complaint? - CORRECT
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ANSWER-Notify the person who complained of the results and what corrective action was
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or will be taken
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What is the term for the treated water storage facilities at water treatment plants? -
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CORRECT ANSWER-Clear wells
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What does the term water quality describe? - CORRECT ANSWER-The composite
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chemical, physical, and biological characteristics of a water supply
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What is one of the best results from a well-guided tour of water system facilities? -
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CORRECT ANSWER-Gaining support to obtain the funds necessary to run a good
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operation
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What conditions in water main dead ends can produce carbon dioxide, methane, and
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sulfide odors? - CORRECT ANSWER-Anaerobic
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What is backsiphonage? - CORRECT ANSWER-a form of backflow caused by a
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negative or below atmospheric pressure within the water supply piping
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What could be the cause of milky water? - CORRECT ANSWER-Air
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Who are a water supply systems ultimate consumers? - CORRECT ANSWER-Homes
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Businesses
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Why may ground water require treatment? - CORRECT ANSWER-To remove
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