Water Distribution Exam Questions & Answers Already Solved 100%

Which is not a type of water ? - Answer Apparent Which layer of a lake is considered nutrient poor? - Answer Hypolimnion (Bottom Layer) Copper Sulfate (Blue Stone) is used in lake management to ? - Answer Control Algae Bloom The Surface Water Treatment Rule requires that - Answer 3-log removal 99.9% for virus,4-log removal 99.99% for virus TDS (Total Dissolved Solids) levels of 1000mg/L is considered ? - Answer Unfit for human consumption An "Appropriate Right" is defined as what type of " water use" right? - Answer Beneficial Use Right What are the acceptable and practical forms of public notification for most water systems for acute violations? - Answer Mail, Newspaper, Radio broadcast A "Transmission Main" is a water main that - Answer Is normally large in size , has very little service connections What well measurement must be known to calculate the specific capacity for a well ? - Answer Draw down and discharge capacity A map containing the size, location, and ties of water mains; valves; hydrants; tanks; and reservoirs is called a ? - Answer Comprehensive map Under the " Safe Drinking Water " act , Lead Free means ? - Answer Provided the use of lead in the system meets certain percentage levels When employees are working in trenches requiring a means of escape (such as a ladder or steps) exits must be located no further than ? - Answer 25' apart A water audit consists of the following techniques ? - Answer Using standard accounting principles to determine the cost of water loss Conducting field test with work crews to gather information on leaks Using listening devices and flow measurements Testing meters for accuracy A device used to check flows in a distribution system is called a - Answer Pressure gauge Generally, a hydrant log should be kept whenever a hydrant is taken out of service . At a minimum the log should include - Answer Date and time when it was placed out of service, Name of party contacted, Date and time when returned to service The type of hydrant that has a wet-top, where-by, the threaded end of the main rod and opening nut are not sealed from water when the main valve is open is the - Answer Dry-Barrel hydrant Standard "pumper-connection" fire hydrants should not be installed on water mains smaller than...... - Answer 6 inches in diameter The type of corrosion caused by the use of dissimilar metals in a water system is ......... - Answer Galvanic Series In the distribution systems FLOWS should not exceed.... - Answer 3.5 feet per second The " Nutating Disc" meter is classified as a ....... - Answer Positive- displacement meter A direct water connection to a boiler containing a highly corrosive scale prevention compound must be protected by a (an)..... - Answer Reduced Pressure Principal A cross-connection is defined as a connection between - Answer A potable and non-potable water system An "Air Gap" technique is used to ......... - Answer Prevent back-flow of non-potable water into the drinking water supply An approved device to prevent back-flow and back-siphonage is a ....... - Answer check-valve A tank containing industrial solvent is under constant pressure . An employee accidentally opens a valve that is connected to the potable water system . Pressure in the tank forces the solvent into the potable water system . This is called........ - Answer Back pressure What is the one major difference between a "Double check" DC and a "Reduced Pressure" RP device ? - Answer An RP is used for toxic substances and a DC is used for Non-toxic substances A cross connection prevention program is - Answer the responsibility of the water utility SPADNS is a reagent used in the analysis of - Answer Fluoride What is an example of an "Acute Violation" - Answer Occurrence of fecal coli-form/E.Coli Violation of the MCL for Nitrate