Class C Water Operator License Exam 2024-2025.Questions & Correct Verified Answers.Grade A, Exams of Water Resources Planning and Management

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Class C Water Operator License Exam 2024-

2025. Questions & Correct Verified Answers.

Graded A

_____ all shoring from the top down and _____ from the bottom up. - ANSinstall, remove ______ is the last barrier between the public and giardia or cryptosporidium. - ANSfiltration ______ is used to anchor pipe bends. - ANSconcrete _______ on a pipeline depend on the _____ or coefficient of pipe roughness. - ANSfriction loss, c factor ________ protection is the electrochemical method for preventing ________ of metal tanks. - ANScathodic, corrosion __________ occurs whenever there is a ______ in the velocity or direction of water flow. - ANSwater hammer, sudden change _____% of all the water on earth is saltwater. - ANS _____% of the earth's surface is ocean. - ANS

100, 150, 200 and 250 are approved classes of _____ _____. - ANSworking pressure 5/8 meters need to be tested at least every _____ to _______ yrs. - ANS5, 10 90% of underground pipe failures are related to improper - ANSbackfill and bedding A 5' deep pipe trench requires exit ladders every ____ feet and it needs to have approved ____. - ANS25. shoring A bacti sample should be taken every ____ft of pipe. - ANS A commonly used method to test for chlorine residual in water is called the ____ method. - ANSdpd A cross-connection is a connection between an _____ and an _______ water supply. - ANSapproved, unapproved A distribution system is a - ANSlooped system A general deposit of mineral particles evenly along the inside of the pipe is ________. - ANStuberculation

A mass of concrete placed at bends and valve structures to prevent pipeline movement is commonly called a _____. - ANSthrust block A piston meter is a _____ meter. - ANSdisplacement A standpipe is considered ground storage unless it exceeds _____ft above the highest ________. - ANS80, service connection A written sample writing plan is required for _______ monitoring. - ANScoliform According to the CDC, which mechanism or problem has caused more waterborne disease outbreaks in the US than any other reported factor? - ANSleaking backflows All public water systems in Texas are required to use _____ as the final disinfectant. - ANSchlorine Ammonia mixed with chlorine gas creates a - ANSwhite smoke An operator may refer to Piezometric elevation, static head, or pressure head as ____ height - ANSvertical water column An oxygen deficient atmosphere is defined as one which contains _____ than ______ % oxygen. - ANSless, 19.

Bacti records are kept for ____yrs and chemical records are kept for ___yrs. - ANS5, 10 Bacti sample bottles are prepared with a chemical called _____ before they are sterilized. - ANSsodium thiosulfate Bacti samples have to be returned to the lab within _hrs of the collection time. - ANS Baffling inside a storage facility may be needed to prevent "hot spots" and ____ flows. - ANSstraight through Bleach is approximately _____% pure. - ANS5. Characteristics of a Centrifugal Pump: as the head _____ the discharge ________. - ANSincreases, decreases Chlorine gas is ____ times heavier than breathing air. - ANS2. Chlorine gas is considered to be ____% pure. - ANS Chlorine is ______ times heavier than air. - ANS2. Chlorine is combined with ______ to form chloramines to prevent the formation of .... in surface water. - ANSammonia, thms

Color in the water supply should be less than _____ units. - ANS Concentrations of fluoride greater than (>) ___mg.L can cause ____ in teeth over time. - ANS2, mottling Condensation, evaporation, percolation, and precipitation are all components of the _______ cycle. - ANShydrologic Controlling valves regulate pressure flow ____ and flow _______. - ANSrates, direction Dead end mains should be flushed - ANSevery month Dead ends in a system are usually located on ____ shaped or ____ designs. - ANStree, grid Distribution systems are usually laid out in ____ and/or circular designs. - ANSloops Electrical demand in a wiring system is determined by the amount of ____ consumed. - ANSwatts Electricity is the preferred power source for most distribution systems because of ______, reliability and relatively low _______. - ANSavailability, cost

Excess nitrate causes a condition called - ANSblue baby syndrome Ground water supply systems serving more than ___ connections must have a total ground storage capacity of ___ gal/connection and elevated storage capacity of ___ gal/connection or pressure tank capacity of __ gal/connection. - ANS50, 200, 100, 20 Horsepower is defined as _____ft-lbs per minute or 746 watts. - ANS33, How can mechanical damage to water meters be avoided? - ANSplace it behind the curb and in a meter box HTH dry powder chlorine is set at ____% purity. - ANS Hydrants have a _____ point in case the hydrant is struck by a vehicle. - ANSbreakaway If a major chlorine leak occurs, call the supplier and the _____. - ANStceq If a repaired main line must be returned to service quickly, dose it with ____mg/L Chlorine, for ___minutes. - ANS500, 30 In Texas ___% of water is used for commercial, industrial or agricultural purposes.

• ANS

In Texas ag water demands accounts for about ___% of the total water used. - ANS Killing disease causing organisms in the water is the primary purpose of ____ in water mains. - ANSdisinfection Ladders should be placed every ___ft in a ditch. - ANS Liquified chlorine gas will expand ____ times its original volume. - ANS Low doses of heavy metals, such as lead and copper, can cause damage to the ______ _____ ______ over time. - ANScentral nervous system Name one advantage to using centrifugal pumps. - ANSthey are easy to repair One by-product of chlorinated water is ____________, a suspected carcinogen when consumed in water over a lifetime. - ANStrihalomethane Out of all the water on earth, less than _____% of freshwater is immediately available to humans. - ANS Physical connection between a safe and potentially unsafe water source. - ANScross connection Powder activated carbon is commonly used to treat ____ and ____ problems in water. - ANStaste, odor

Public opinion of the water utility is _______ at a standstill. - ANSnever Safe withdrawal weight from a 150lb cylinder is ___lbs and 400lbs from a ____ton cylinder. - ANS40, 1 Service tap components usually consist of a tapping saddle, corporation stop, service line tubing, curb stop and a _____. - ANSmeter Sewer mains should be __ft away from water mains. - ANS Shoring should be used if a ditch is ___ft or deeper. - ANS Supply systems must maintain a minimum water pressure of ___ psi under normal conditions and at least ___psi during emergencies. - ANS35, 20 The _____ is the only cross connection control method approved by _______. - ANSair gap, tceq The ______ water pressure required by the rules and regulations is ____psi under any and all conditions. - ANSminimum, 20 The "Texas Hazard Communications Act" is known as the "____ ___ ____ Act." - ANSright to know

The 2 pathogenic protozoans resistant to chlorination are: __________. - ANSgiardia and cryptosporidium The 2 primary categories of pumps are: ____ and _____. - ANScentrifugal, positive displacement The action level for lead is ____mg.L, and for copper is ____mg/L. - ANS0.015, 1. The federal regulator of drinking water is the ___. - ANSepa The following minimum residuals is ______mg/L for free chlorine and ____mg/L for total chlorine. - ANS.2,. The main purpose of the water storage facility is to provide ____ amount of water to average or equalize the ______ demands plus provide ______ pressures to fight fires. - ANSsufficient, daily, minimum The most common collection point for a bacti sample is the water tap _______. - ANSoutside the house The most common type of water meter is the ____ ____ meter. - ANSpositive displacement The most common valve is the _______. - ANSgate valve

The most commonly used fire hydrants used in distribution systems are the _________. - ANSdry barrel The most difficult part of a water distribution operator's job. - ANSfurnish a continuous supply The operator should leave a ________ of slack in flexible tubing. - ANSgooseneck The primary goal of coagulation, sedimentation and filtration is to remove ____. - ANSturbidity The primary state regulator of water utilities is the ____. - ANStceq The process of separating floc from water by gravity is called ____. - ANSsedimentation The rated flow of a water meter, as stated by the manufacturer, is based upon ______ flow. - ANScontinuous The spoil bank should be located at least ___ft away from the ditch. - ANS The State recommends a TON (Threshold Odor Number) of less than ____. - ANS The State requires that _____ _____ be kept in storage for disinfection of new water lines. - ANScalcium hypochlorite

The term associated with water that evaporates from living plants is referred to as _____. - ANSevapotranspiration To be classified as a pws, the system must have at least __ service connections or serve at least __ individuals at least ___ days out of the year. - ANS15, 25, 60 Water hardness is caused by - ANScalcium and magnesium Water is stored to meet peak demand and to allow production facilities to operate at _______ rates. - ANSuniform Water with a pH less than 7 is considered to be - ANSacidic Water with a pH of 7.9 is considered to be ______ or _____. - ANSbasic, alkaline What are the three main components of a centrifugal pump? - ANSimpeller, case and shaft What is the main difference between surface water and groundwater contamination? - ANSgroundwater takes longer to recover after contamination What is the minimum setback distance for fire hydrants to avoid large vehicle overhang? - ANS2ft

What is the primary reason for using dry barrel fire hydrants? - ANSto keep it from freezing What type of water meter is used when the water flow widely fluctuates? - ANScompound When an operator isolates a motor from an operable system for repair, it is vital that he/she follow a _____/_____ procedure. - ANSlockout/tagout When chlorine gas is added to water, the pH goes down due to the two _____ that form. - ANSacids When disinfecting a water line, use ____mg/L of chlorine in the main and let stand for ____hrs. - ANS50, 24 When pressure testing the water main, the test pressure should be ___times as great as the ________ operating pressure. - ANS1.5, normal When residential water meters become worn, they have the tendency to ____ all flows. - ANSunder register When turning a centrifugal pump off, "this" must be done to prevent water hammer. - ANSclose the discharge valve You must coordinate a plan for shutdown of a water storage facility so that the distribution system will still be able to _____ upon and after the shutdown. - ANSmeet the customers demands