Water Distribution Test Questions and Answers 100% Pass

Water Distribution Test Questions and Answers 100% Pass Distribution systems are usually laid out in which of the following patterns besides Tree shaped and Grid designs? a. Loops and/or circular designs b. Vertical designs without backflow prevention devices c. Horizontal lines that flow into open ponds then back into a closed pipe d. Horizontal lines that flow into underground sumps then back into a closed pipe a. Loops and/or circular designs Dead ends in a system are usually located on a. Loops and/or circular designs b. Tree shaped and Grid designs c. Oval designs d. transmission mains e. Cul de Sac's with return lines b. Tree shaped and Grid designs An operator may refer to Piezometric elevation, static head, or pressure head as a. horizontal water elevation b. water pressure from a pump c. maximum pressure from a fire hydrant d. vertical water column height d. vertical water column height A downstream closed sectionalizing valve without pressure reducing valves in the system will have which of the following pressures placed upon it? a. the water surface elevation from the last point where the water is open to the atmosphere b. the back pressures from a downstream point c. the downstream booster pump operation d. the operation of a fire hydrant located immediately downstream of the hydrant a. the water surface elevation from the last point where the water is open to the atmosphere What is the main purpose of a water storage facility? a. to allow storage reserve during wet periods b. to help maintain adequate pressures throughout the entire system c. to meet needs for fire protection d. to provide sufficient amount of water to average or equalize the daily demands plus provide minimum pressures to fight fires d. to provide sufficient amount of water to average or equalize the daily demands plus provide minimum pressures to fight fires Electrical demand in a wiring system is determined by the amount of a. Ohms in the entire system b. Voltage a system draws c. Watts consumed d. water pressure in the system c. Watts consumed Baffling inside a storage facility may be needed to prevent "hot spots" and a. straight through flows b. long contact times with disinfectants c. high chlorine residuals throughout the facility d. high temperatures throughout the storage facility a. straight through flows Chlorine may be added to water in a continuous, slug, and/or the _______ method to initially disinfect a pipeline? a. segmented b. tablet c. low dose d. air injection b. tablet Wear rings in a centrifugal pump are designed to a. prevent excessive internal water circulation between the suction and discharge sides of a pump b. prevent wear of the impeller and inside case c. allow excessive internal water circulation to occur between the suction and discharge d. both a & b are correct, but not c d. both a & b are correct, but not c Packing ring notches in a centrifugal type pump should be ______ when placed in the stuffing box? a. water tight b. staggered 90º c. made of rubber not metal d. heated b. staggered 90º Eighty parts per billion (80 ppb) is equal to which of the following? a. 8 ppm b. 0.8 mg/L c. 0.08 mg/L d. 80 mg/L c. 0.08 mg/L A mass of concrete placed at bends and valve structures to prevent pipeline movement is commonly called a a. thrust block c. curb stop b. corp stop d. service block a. thrust block What is the main difference between surface and groundwater contamination? a. groundwater takes longer to recover after contamination b. groundwaters are less susceptible to contamination c. surface waters take longer to recover d. surface waters are usually harder and more difficult to recover a. groundwater takes longer to recover after contamination What constitutes a cross-connection? a. a connection between an approved and an unapproved water supply b. an unprotected connection between a drinking water supply and a system not approved as safe c. a connection between a contaminated supply and non-potable supplies d. all of the above a. a connection between an approved and an unapproved water supply According to the Center for Disease Control (CDC), which mechanism or problem has caused more waterborne disease outbreaks (WDO) in the United States than any other reported factor? a. inadequate O&M of filtering systems b. lack of chlorination c. wellhead