Introduction to Water Distribution Systems Exam Questions and Answers Latest Update

To help prevent tooth decay, public water distribution systems add _____. - ANSWER-fluoride A homeowner is having a well installed in an area where the water table is 30 feet below the surface. The type of well installed will most likely be dug or _____. - ANSWER-driven More gallons per minute can be pumped from a well that is _____. - ANSWER-deeper To dissolve carbon dioxide and to oxidize iron and manganese, water treatment systems use _____. - ANSWER-aerators After water is pumped from a river or lake to a water treatment plant, the first step of treatment is _____. - ANSWER-aeration To protect against corrosion and oxidation, galvanized pipe is electroplated with a coating of _____. - ANSWER-zinc Water meters are usually installed by _____. - ANSWER-a city or county employee Any reversed flow of used or nonpotable water into the potable water distribution system is called _____. - ANSWER-backflow The flow of water in a water distribution system is regulated by a ______. - ANSWER-valve A water supply line that a plumber is installing requires the close control of flow at all times. To ensure maximum control, the plumber should install a _____. - ANSWER-globe valve The type of valve used in piping systems with extremely low backpressure is a _____. - ANSWER-ball-check value The _____ should be installed so that it bypasses the water softener. - ANSWER-hose bibb The type of valve that reduces the risk of scalding by mixing the water coming from the hot water heater to a preset temperature before it is delivered to the faucet is a _____. - ANSWER-