Class D Water Exam Illinois questions with answers

Class D Water Exam Illinois questions|\ |\ |\ |\ |\ |\




with answers |\




For a water storage tank, cathodic protection is only
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effective for the: - CORRECT ANSWERS ✔✔tank areas
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covered by water |\ |\




For a water storage system, the purpose of an altitude
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valve is to prevent: - CORRECT ANSWERS ✔✔overflows
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Before using a water storage tank that has been
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disinfected, water from the tank must not show the |\ |\ |\ |\ |\ |\ |\ |\ |\



presense of: - CORRECT ANSWERS ✔✔coliforms |\ |\ |\ |\ |\




High trihalomethane (THMs) levels may cause: - CORRECT
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ANSWERS ✔✔cancer
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A finished water with a negative Langelier Index may be: -
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CORRECT ANSWERS ✔✔corrosive
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Water with pH scale less than 7 is considered: - CORRECT
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ANSWERS ✔✔acidic |\

,pH scale of 7 is considered - CORRECT ANSWERS
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✔✔neutral


pH scale of 8-14 is considered? - CORRECT ANSWERS
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✔✔basic


How many gallons of water are in 1 cubic ft? - CORRECT
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ANSWERS ✔✔7.48 gallons |\ |\




How many gallons of water are in 15 cubic ft? - CORRECT
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ANSWERS ✔✔15 x 7.48 = 112.2 gallons |\ |\ |\ |\ |\ |\




How many cubic ft of water is 20 gallons? - CORRECT
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ANSWERS ✔✔20/7.48 = 2.67 cubic ft |\ |\ |\ |\ |\




1 gallon of water equals how many lbs? - CORRECT
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ANSWERS ✔✔8.34 lbs |\ |\




16 gallons of water is how many lbs? - CORRECT
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ANSWERS ✔✔16 x 8.34 = 133.44 lbs |\ |\ |\ |\ |\ |\




A 180 ft water tower would show what psi on the gauge
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located at the base? - CORRECT ANSWERS ✔✔180/ 2.31
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= 77.92 psi
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, Pump cavitation is most likely to occur when: - CORRECT
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ANSWERS ✔✔the top of the water source level is lower |\ |\ |\ |\ |\ |\ |\ |\ |\ |\



than the impeller |\ |\




1 pound per square inch is equal to how many feet of
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elevated water? - CORRECT ANSWERS ✔✔2.31 feet |\ |\ |\ |\ |\ |\




For most centrifugal pumps, if the total dyanmic head
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decreases, the pump will: - CORRECT ANSWERS ✔✔pump |\ |\ |\ |\ |\ |\ |\ |\



water at a faster rate in gpm. (less head to push against)
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The velocity of water is measure in: - CORRECT ANSWERS
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✔✔Feet per Second
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Distance (feet)/Time (sec) |\ |\




When water lines in a distribution system are installed
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parallel to sewer lines, they should be located how far
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apart from the sewer lines? - CORRECT ANSWERS ✔✔10 ft
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Air relief valves in the distribution system should be
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located where? - CORRECT ANSWERS ✔✔at the high point
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on a main
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