Level 1 water distribution practice test -with 100% verified solutions 2024-2025, Exams of Advanced Education

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Level 1 water distribution practice test -with 100%

verified solutions 2024-

The minimum and maximum chloride residual in a water distribution system is? 0.2 mg/l and 4mg/L of free chlorine Nitrate may not exceed what concentration when tested yearly for a groundwater treatment plant? 10 mg/L The minimum number of total coliform samples that must be collected per month is based on Wich of the following? The population served by the system When a distribution bacteriological sample is positive for a total coliform the procedure is? 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? 6 hours What is hydraulic grade line? 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? Every year

Water pipelines are generally designed to carry water at a velocity below? 2.5b FPS. Feet per second Energy use in water systems is defined best by? 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? 6 feet Which of the following should be in an organization plan? 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? 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 Plan and profile drawings Which are the components of directing staff? Motivating & communicating The accuracy of large meters should fall within what range? Not less than 97% not more than 103%

In some older water system lead service line still exist. What would be the best practice when finding lead pipe? Be replaced What is the acceptable range for water loss in a typical municipal distribution system that has a variety of pvc and di pipe? 20% (80% effienciency) What is a major cause of underground construction deaths? Lack of shoring or shoring failure If the tds is marginally too high for the pump the likely result will be? Decrease in flow rate Air release valves are installed at what location in a water line? At high points of a pipe line The maximum pressure at service connections should be less than? 100 psi In selecting and Evaluating a tank, storage capacity must be matched _______of the system?

Peak demand A hydraulic grade line will always slope in what direction? Slope downward in the direction of the water flow Where does the majority of microbial growth with in a water distribution system occur? Dead end water lines Wells that are biologically contaminated from repeat coliform or fecal coliform must be bacteriologically surveyed and sample which is not correct? They must be at least 12 hours apart When backfilling a pipe line how deep should the first layer of backfill be compacted At the horizontal centerline of the pipe What is an important step in problem solving Realization that a problem still exist What type of pipe joint is a considered inflexible and therefore is not usually installed below ground? Flanged joint

buttefly valves are used in distribution systems? Generally when the pipeline is greater than 16''. When someone throttling might be replaced. When a motorized operator is needed for automated control. Fire hydrants should be placed at? 350 to 600 feet apart At all intersections In close proximity when used in high value commercials applications AWWA M-17 requires how many fire hydrants to be used when conducting a fire flow test? Two An unsafe condition per osha regulations would be? Working in granular soil with a trench width less than 1: What type of pump consist of an impeller fixed on a rotating shaft enclosed in a casing? A centrifugal pump

The purpose of a check valve is to? To prevent flow in a reverse direction A complete framework of wood and or a metal that is designated to support the walls of a trench is referred to as Wich or the following? Shoring A weighted check valve if improperly adjusted can result in? Water hammer Protected classes of employees includes? Over 40 years of age gender and political affiliation Gate valves are used in water distribution systems because? They exhibit less friction than other valves Wich of the following best describes the definition of controlling? Ensuring that progress is being made toward objectives and taking corrective actions as Necessary What are 4 types of maintenance in preventative maintenance program? Predictive maintenance,predictive maintenance,planned maintenance, corrective maintenance

About how many gallons would a 6'' pipeline ,1000 feet long hold 1500 Why is the objective of any safety program? To prevent accidents What is the chlorine residual in a treated water if the dose was 2.1 mg/L and the demand was. 0.8 mg/L? 1.3 mg/L If the chlorine demand of the water was 2.5 mg/L and the system required a 0.5 mg/L residual about how much chlorine in lbs? Would be needed to be fed to one million gallons of water? 30 lbs Estimate how many gallons of water a circular talk 40 feet in diameter and 10 feet deep will hold? 94,000 gallons What is the percent accuracy for a water meter that registered 96, gallons when the actual amount of water passing through it was 100, gallons? 96%

A head of 200 ft wouldn't be a pressure about? 85 psi What is the best way to prevent back flow? Permanently eliminate the hazard A pumps runs about 24 hours. And pumped. 302,400 gallons the capacity of this pump Is about? 200 gpm Which Florida admin code relates to standards ,monitoring and reporting? 62- Which Florida Administrative Code refers to permitting ,construction and maintenance of water systems? 62- Which Florida Administrative Code refers to out of compliance? 62- How many tiers of notifications are their for public notices? 3 #1.immediate notice

#2.30 days #3. 1 year Water mains parallel to sanitary sewers should be in at least? 10 feet Water mains horizontally away from the sewers should be installed at least? One foot Swab and pigs cleaning Aqua pigs? Being introduced into the line through a standard Y section regular T sections can also be used Cement mortar lining of metal water mains in a place has proven to be very valuable under which circumstances? Cement -mortar lining of metal water mains in place has proven to be very valuable. Pipe carrying capacity has been seriously decreased because of tuberculation. Corrosion products are released into the water in unacceptable amounts and abnormal leakage through poor joints or holes in the pipe wall exist Liquid chlorine contains how much percentage? Or gas 100 percent

What is the lowest strength of chlorine liquid solution? 5 to 15 percent calcium hypochlorite is a dry material contains? 65 percent available chlorine What AWWA standard describes the disinfection of water storage facilities? C652- Or 652 Minimum time period for retaining records lead and copper monitoring rule? 12 years Chlorine to ammonia nitrogen ratios A dosage of 3 parts of chlorine to one part ammonia (3:1) will form monochloramines this ratio provides an excess of ammonia nitrogen Wich will be available to react with any chlorine added in the distribution system to boost the chloramine residual The maximum chlorine to ammonia ratio that can be achieved is 5: The 2 major types of chlorine feeders are?

Hypochlorinators , and chlorinators