Water Distribution Grades 1 & 2 Practice test exam latest

Water Distribution Grades 1 & 2 Practice
test exam latest
Which agency sets legal limits on the concentration levels of harmful contaminants in
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potable water distributed to customers? - CORRECT ANSWER-US Environmental
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Protection Agency
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The number of monthly distributions system bacteriologiacal samples required is -
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CORRECT ANSWER-Based on the population served
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What is the maximum contaminant level for total trihalomethanes (TTHM) in the united
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States? - CORRECT ANSWER-0.080 mg/L
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Under the Surface Water Treatment Rule, disinfection residuals must be collected at the
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same location in the distribution system as - CORRECT ANSWER-coliform samples
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Iron can cause "red water" and thus customer complaints when its concentration is
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above its secondary maximum contaminant level of - CORRECT ANSWER-0.30 mg/L
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The goal of the Surface Drinking Water Act is for each ________ to accept primary
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enforcement responsibility (primacy) for the operation of the state's drinking water Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`




program. - CORRECT ANSWER-State
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What is the objective of Total Coliform Rule? - CORRECT ANSWER-To promote routine
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surveillance of distribution system water quality to search for fecal matter and/or disease-
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causing bacteria
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Which agency sets standards on the concentration levels of harmful contaminants in
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drinking water? - CORRECT ANSWER-EPA
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Explain the difference between the different tiers of violations. Which tier is the most
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serious? - CORRECT ANSWER-Tier 1 = 24 hours (most severe)
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Tier 2= 30 days
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Tier 3= 1 year
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A positive E. Coli test must be reported to the primacy health agency within what time
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period? - CORRECT ANSWER-24 hours
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How is the required number of monthly bacteriological samples determined? -
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CORRECT ANSWER-Population served
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What is the action level for lead in first-draw samples taken from customer taps? -
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CORRECT ANSWER-0.015 mg/L
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A water system is designated a community public water system if it serves how many
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homes? - CORRECT ANSWER-15 or more
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What authority provides specific water sampling instructions? - CORRECT ANSWER-
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The state primacy agency
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According to the Lead and Copper Rule, what is the action level for lead? - CORRECT Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`

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ANSWER-0.015 mg/L
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Head is measured in - CORRECT ANSWER-Feet
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A plat is - CORRECT ANSWER-a map
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At which time of the day is the age of the water stored in the distribution system the
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highest? - CORRECT ANSWER-Early morning
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Water mains should primarily be sized based on - CORRECT ANSWER-adequate fire
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flow at an appropriate pressure
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The most desirable residential pressure ranges from - CORRECT ANSWER-50 to 75
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psi (345 to 517kPa)
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Domestic water use includes water that is supplied to residential areas, ____________, Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`

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and institutional facilities. - CORRECT ANSWER-commercial districts
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Riparian doctrine is sometimes called the "rule of - CORRECT ANSWER-reasonable Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`

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sharing."
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During which season is water typically the highest? - CORRECT ANSWER-summer
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Of the common types of distribution system, which type is considered least desirable? -
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CORRECT ANSWER-Tree system
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The velocity of water is calculated as the quantity of water that flows through a pipe -
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CORRECT ANSWER-divided by the cross-sectional area of pipe
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What is the term for water pressure in a main or in a container that is measured by a
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gauge? - CORRECT ANSWER-Gage pressure
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In hydraulics, how is head expressed? - CORRECT ANSWER-ft-pounds per pound
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What is the term for pressure measured in terms of the height of water ( in meters or
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feet)? - CORRECT ANSWER-Head
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What are three types of head? - CORRECT ANSWER-Elevation head
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velocity head Il`




pressure head
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The highest degree of protection for the exterior of a coating steel pipe is - CORRECT
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ANSWER-Cathodic protection
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The C value is a measure of a pipe wall's - CORRECT ANSWER-roughness, which
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retards flow due to friction.
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Type of joint for ductile iron piping? - CORRECT ANSWER-Push-on joint
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What is the term for a sudden repeated increase and decrease in pressure that
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continues until dissipated by friction losses? - CORRECT ANSWER-Water Hammer
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Not a type of joint generally used today for connecting DIP and fittings? - CORRECT
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ANSWER-Riveted joint
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What measurement of a pipe's strength refers to its ability to withstand the pressure
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exerted on it after it has been buried in a trench? - CORRECT ANSWER-External Load
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What term refers to the process by which organic compounds pass through plastic
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