Water Operator Class 3-Practice Test Questions with Correct Answers

Water Operator Class 3-Practice Test Questions with Correct Answers MCL for TTHM's 0.08 ppm MCL for HAA5's 0.06 ppm MCL for Arsenic 0.01 ppm MCL for Lead 0.015 ppm Turbidity meter must be calibrated every: 90 days MCL for turbidity is Less than 0.3 for 95% of the time. pH meters must be calibrated using 2 buffers A grassy of fishy taste in reservoir water indicates Algae blooms Mudballs are caused by Improper backwashing of filters Lime can only be used to soften water with Carbonate Water leaving Zeolite softener has a hardness of 0 ppm The top layer of a slow sand filter is called the Schmutzdecke A solids contact unit combines Coagulation, flocculation, sedimentation The PMCL for fluoride is: The SMCL is: 4 ppm, 2 ppm Flock will settle better in warm or cool water? Warmer The greensand manganese removal process requires a: High pH Aeration releases what from water? Volatile organic compounds & gases (odor) The most accurate method of determining chlorine residual is: Amperomatic tiration An alkalinity sample is titrated using Sulfuric acid A beaker is used for Mixing and measuring NTU stands for: Nephelometric turbidity units Bacteria results must be kept for: Chem results for: 5 years, 10 years Four ways water meters operate are: Tubrbine, Propeller, Venturi, Nutating discs A preventative maintenance program includes: Procedure, Part, Budget, Cost An advantage of a standpipe: Lower insurance rates What is GIS? Geographic Informaton System High flow rates in pumps can cause. Cavitation (boiling) Three ways sludge is removed from a settling basin are Mechanical rakes, drag chain, traveling bridges The 4 zones of settling basin are: Inlet, Outlet, Settling, Sludge Polyphosphates are injected before or after chlorination? Before A nonionic polymer is usually used as a: Filter aid Three "bugs" targeted by the SWTR are: Giardia, Legionella, Cryptosporidium What should be done with backwash water? Returned to plant head Activated carbon is used to remove: Taste, odor, chlorine, THM's THM's can be removed by: Adsorption, oxidation, or aeratoin Algae produces more or less oxygen at night as compared to day? Less A LOG removal of 4 is a removal of what percent? 99.99% One outstanding advantage to ozone is: Removes color, taste, odor Three forms of combined chlorine residual are: Monochloromines, Dichloramines, Trichlorimaines TOC's are precursor in the formation of: THM's A pipet is used to Deliver very accurate volumes What is a spore? Bug in a dormant state List some tools used to align a coupling between a motor and a pump. Straight edge, feeler gauge Rate of flow controllers work on Differential pressure What is hydraulic grade line? Head pressure at various points An RPZ backflow preventor is used for tall buildings Electric motors in a water plant accounts for what percent of the total electrical use? 90% Excessive nitrates in water causes: Methemoglobinemia Filter beds should expand ____ when backwashing. 50% When a reservoir is rich in nutrients such as phosphates and nitrogen, its condition is: Eutrophic How would you start a power management program? ID each source of energy use. What is an end point? Color change at end of titration The MCL for nitrates is? 10 mg/L What is the IDHL level for chlorine gas? 10 ppm If you breath chlorine gas, you should drink: Milk Name two situations that can cause a well screen to become clogged Iron bacteria, calcium hardness How do you notify the public about an acute MCL violation on a community system? Paper 14 days, Radio or TV 72 hrs, Mail 45 days Three ways algae can affect filter plants are: Clog intake screens, affect coagulation, shorten filter runs ____ is the indicator and ____is the titrant when testing for chlorides. Potassium chromate, silver nitrate What is the MCL for coliform if you take 40 or more samples per month? No more than 5% of samples What determines the quality of the water entering the distribution system from a filter plant? Quality of water leaving filter What is a coupon used for? Detect corrosiveness A fully open chlorine bottle is how many turns? 1 turn Chlorine repair kit "A" is used for 150 bottle Back siphonage can be prevented by using a Vacuum breaker Chlorine dioxide is made by mixing Sodium chlorite and chlorine Why is ozone made on site? It is unstable A multistage pump can create a large amount of Head pressure Pump curves can include horsepower, efficiency and ____ flow Overlubrication can cause bearings in a centri pump to Overheat Water soaking down through soil is Percolation The white pill in a sample bag is: Sodium thiosulfate (kills chlorine) What can cause water to be corrosive? Low pH, oxygen, CO2 Two nuisance organisms are: Nematodes, Crenothrix SMCL for Iron is. For Manganese: 0.3, 0.05 Joining one chemical to another to prevent precipitation: Sequester The SDWA was signed into law December 19__ 1974 The higher the c-factor the ____the pipe smoother What type of storage is used for a filter plant? Clear well Shut-off valve in main lines should be located ____apart 1000ft Hydrants should be located no more than ____ apart. 500 ft Themost commonly used joint is the: Push on joint CFR stands for: Code of federal regulations Valve used to regulate flow: Globe valve Road signs should be no more than ____ apart. 200 ft SCADA stands for: Supervisory Control and Data Acquisition System What carries finished water out of filter? Underdrain What are the 4 cycles of a zeolite softener? Service, Backwash, Brine, Rinse A zeolite softener is an ____ exchange type of process. Ion The action level for lead is? .015 mg/L 3 Types of well screens are: Continuous slot, bar, wire-wound Activated carbon is used to remove: Taste and odor A hypochlorinator should be calibrated how often? Each shift Hardness is composed of what? Calcium and Magnesium Ions Which part of the state sanitary code covers potable water? Part 12 NTU stands for: Nephelometric Turbidity units What is cathodic protection used for? Corrosion control The 4 zones of a settling basin are: Inlet, Outlet, Sludge, Settling An upflow clarifier combines what 3 processes? Coagulation, Flocculation, Sedimentation When operating a manganese greensand filter, the water should be what color just before entering the filter? Slightly pink A renovation of your existing plant must be pre-approved by: The state health dept In a conventional filtration system, ____ is the fast mix. Coagulatoin Two types of aeration are: Stacked tray and diffused Two types of color in water can be: Apparent and true Phosphates should be added ____ chlorine. Before Two filter backwashing aids are: Air wash and surface wash What will caustic soda or soda ash do to water? Raise pH The ____ or ____ index is used to help determine the corrosivity of water. Ryznar and Langelier A type of water meter used for a house is: Nutating-disc A pump with an impeller spinning inside of a volute is called a: Centrifugal pump The casing vent on a well should be: Turned down and screened The purpose of a latern ring is: Allow a path for lubrication to the pump shaft The spaces between large material such as gravel is known as: Porous A diaphragm pump is a: Positive displacement pump When renovating an existing well, before returning to service the well must be chlorinated with at least ____ for at least ____. 50 ppm for 3 hrs A well casing should extend at least ____ above ground level. 12 inches A chemical feed pump should be calibrated at least: Every shift Does ground water or surface water have more hardness and less turbidity? Ground water A water well should be located no closer than ____ feet from a source of contamination: 50 ft Well casings should extend ____ below the ground. 50 ft A valve used to regulate water in an elevated storage tank is: Altitude valve The minimum chlorine residual at the end of a line and the maximum chlorine residual allowed at the end of a line is: .5 and 4 mg/L An indicator organism for possible diseases transmitted by water is: Coliform Calcium hypochlorite is what type of chlorine? Granular A reagent used to field test for chlorine residual is: DPD The cycle which describes water evaporating and returning to the earth is known as the: Hydrologic cycle The most commonly used coagulant is: Alum Activated carbon is mostly used: To remove taste and odor What part of a clarifier does floc settle into? Sludge zone What effect can lime have on water? Raise the pH and reduce hardness In a rapid sand filter, backwash water is collected and taken out of the filter though the: Wash troughs In a rapid sand filter, what collects the filtered water? Under drain system Two ways to aid in backwashing a rapid sand filter are: Mechanical surface wash and air wash. Activated carbon works on the principal of: Adsorption Turbidity and GWUDISW rules and regulations fall under the: Surface Water Treatment Rule The MCL for turbidity is: .3 NTU's or lower 95% of the time Rapid sand filters remove: Particles Calcium carbonate for corrosion should be applied: Just after the filter If a gas chlorine cylinder is leaking, it will leak slower if it leaks: Gas An instrument used to detect a breakdown in the internal windings of an electric motor. Megger Tubes are sometimes located in the: Settling basin To reduce the size of the floc, you sould: Speed up the flocculator If you notice fly larvae (blood worms) in your water supply, what is the first thing you should start looking at as the problem? The condition of the screens on your vents and overflows A ladder should extend how far above the structure that it accesses? 3 ft Any chemical you place into your water must have this approval: ANSI/NSF 60 approval Any discharge from your water plant should be permitted by: LDEQ Polymer is short for: Polyelectrolytes The first step you should take when working on a pump is: Lock out tag out A rotten egg odor in water indicates what? Hydrogen sulfide What is the desired amount of fluoride in water? 1 ppm Sodium Fluoride and Hydrofluosilicic acid are two chemicals us to do what? Fluoridate water What is alum and ferric chloride used for? Coagulants How high should a well casing extend above ground level? 12 inches How high should a vent extend above ground level? 24 inches The secondary standard for pH in potable water is: 6.5 - 8.5