Water Operator Class 3- Practice Test Questions 100% VERIFIED ANSWERS 2024/2025 STUDY SE, Exams of Health sciences

Download Water Operator Class 3- Practice Test Questions 100% VERIFIED ANSWERS 2024/2025 STUDY SE and more Exams Health sciences in PDF only on Docsity! Water Operator Class 3- Practice Test Questions 100% VERIFIED ANSWERS 2024/2025 STUDY SET 0.08 ppm MCL for TTHM's 0.06 ppm MCL for HAA5's 0.01 ppm MCL for Arsenic 0.015 ppm MCL for Lead 90 days Turbidity meter must be calibrated every: Less than 0.3 for 95% of the time. MCL for turbidity is 2 buffers pH meters must be calibrated using Algae blooms A grassy of fishy taste in reservoir water indicates Improper backwashing of filters Mudballs are caused by Carbonate Lime can only be used to soften water with 0 ppm Water leaving Zeolite softener has a hardness of Schmutzdecke The top layer of a slow sand filter is called the Coagulation, flocculation, sedimentation A solids contact unit combines 4 ppm, 2 ppm The PMCL for fluoride is: The SMCL is: Warmer Flock will settle better in warm or cool water? High pH The greensand manganese removal process requires a: Volatile organic compounds & gases (odor) Aeration releases what from water? Amperomatic tiration The most accurate method of determining chlorine residual is: Sulfuric acid An alkalinity sample is titrated using Bug in a dormant state What is a spore? Straight edge, feeler gauge List some tools used to align a coupling between a motor and a pump. Differential pressure Rate of flow controllers work on Head pressure at various points What is hydraulic grade line? tall buildings An RPZ backflow preventor is used for 90% Electric motors in a water plant accounts for what percent of the total electrical use? Methemoglobinemia Excessive nitrates in water causes: 50% Filter beds should expand ____ when backwashing. Eutrophic When a reservoir is rich in nutrients such as phosphates and nitrogen, its condition is: ID each source of energy use. How would you start a power management program? Color change at end of titration What is an end point? 10 mg/L The MCL for nitrates is? 10 ppm What is the IDHL level for chlorine gas? Milk If you breath chlorine gas, you should drink: Iron bacteria, calcium hardness Name two situations that can cause a well screen to become clogged Paper 14 days, Radio or TV 72 hrs, Mail 45 days How do you notify the public about an acute MCL violation on a community system? Clog intake screens, affect coagulation, shorten filter runs Three ways algae can affect filter plants are: Potassium chromate, silver nitrate ____ is the indicator and ____is the titrant when testing for chlorides. No more than 5% of samples What is the MCL for coliform if you take 40 or more samples per month? Quality of water leaving filter What determines the quality of the water entering the distribution system from a filter plant? Detect corrosiveness What is a coupon used for? 1 turn A fully open chlorine bottle is how many turns? 150 bottle Chlorine repair kit "A" is used for Vacuum breaker Back siphonage can be prevented by using a Sodium chlorite and chlorine Chlorine dioxide is made by mixing It is unstable Why is ozone made on site? Head pressure A multistage pump can create a large amount of flow Pump curves can include horsepower, efficiency and ____ Overheat Overlubrication can cause bearings in a centri pump to Percolation Water soaking down through soil is Sodium thiosulfate (kills chlorine) The white pill in a sample bag is: Low pH, oxygen, CO2 What can cause water to be corrosive? Nematodes, Crenothrix Two nuisance organisms are: Corrosion control What is cathodic protection used for? Inlet, Outlet, Sludge, Settling The 4 zones of a settling basin are: Coagulation, Flocculation, Sedimentation An upflow clarifier combines what 3 processes? Slightly pink When operating a manganese greensand filter, the water should be what color just before entering the filter? The state health dept A renovation of your existing plant must be pre-approved by: Coagulatoin In a conventional filtration system, ____ is the fast mix. Stacked tray and diffused Two types of aeration are: Apparent and true Two types of color in water can be: Before Phosphates should be added ____ chlorine. Air wash and surface wash Two filter backwashing aids are: Raise pH What will caustic soda or soda ash do to water? Ryznar and Langelier The ____ or ____ index is used to help determine the corrosivity of water. Nutating-disc A type of water meter used for a house is: Centrifugal pump A pump with an impeller spinning inside of a volute is called a: Turned down and screened The casing vent on a well should be: Allow a path for lubrication to the pump shaft The purpose of a latern ring is: Porous The spaces between large material such as gravel is known as: Positive displacement pump A diaphragm pump is a: 50 ppm for 3 hrs When renovating an existing well, before returning to service the well must be chlorinated with at least ____ for at least ____. 12 inches A well casing should extend at least ____ above ground level. Every shift A chemical feed pump should be calibrated at least: Ground water Does ground water or surface water have more hardness and less turbidity? 50 ft A water well should be located no closer than ____ feet from a source of contamination: 50 ft Well casings should extend ____ below the ground. Altitude valve A valve used to regulate water in an elevated storage tank is: .5 and 4 mg/L The minimum chlorine residual at the end of a line and the maximum chlorine residual allowed at the end of a line is: Coliform An indicator organism for possible diseases transmitted by water is: Granular Calcium hypochlorite is what type of chlorine? DPD A reagent used to field test for chlorine residual is: Hydrologic cycle The cycle which describes water evaporating and returning to the earth is known as the: Alum The most commonly used coagulant is: To remove taste and odor