Level 1 water distribution practice test Questions & Correct Answers!!

The minimum and maximum chloride residual in a water distribution system is ? - ANSWER 0.2 mg/l and 4mg/L of free chlorine Nitrate may not exceed what concentration when tested yearly for a groundwater treatment plant ? - ANSWER 10 mg/L The minimum number of total coliform samples that must be collected per month is based on Wich of the following ? - ANSWER The population served by the system When a distribution bacteriological sample is positive for a total coliform the procedure is ? - ANSWER Repeat the sample and take a sample 5 connections upstream and downstream to confirm total coliform For lead and copper sample the water must be In the pipeline for at least? - ANSWER 6 hours What is hydraulic grade line ? - ANSWER A line to which the water level would rise in a small ,vertical tube,connected to the pipe How often should cathodic protection anodes in your system be inspected? - ANSWER Every year Water pipelines are generally designed to carry water at a velocity below ? - ANSWER 2.5b FPS. Feet per second Energy use in water systems is defined best by ? - ANSWER Energy use varies among systems and an energy inventory study would need to be conducted to determine relationships The minimum recommended separation distance between a water main and a storm sewer is ? - ANSWER 6 feet Which of the following should be in an organization plan ? - ANSWER Identifies clear lines ,defines the divisions of labor ,establishes unity of command If pipelines are not restrained using steel rods concrete thrust blocks can be used at ? - ANSWER Every bend and transition Engineering Drawings that show the depth of pipe, the pipe location both vertically and horizontally and the correct distance form a reference point are known as which of the following - ANSWER Plan and profile drawings Which are the components of directing staff ? - ANSWER Motivating & communicating The accuracy of large meters should fall within what range ? - ANSWER Not less than 97% not more than 103% In some older water system l