Water Operator License Class C Detailed Final Exam with Correct Approved Solutions 2026

Florida Water Florida Water Water Operator License Class C Detailed Final Exam with Correct Approved Solutions 2026 Ammonia mixed with chlorine gas creates a - Correct Ans-white smoke The most difficult part of a water distribution operator's job. - Correct Ans-furnish a continuous supply Physical connection between a safe and potentially unsafe water source. - Correct Ans cross connection A distribution system is a - Correct Ans-looped system Dead end mains should be flushed - Correct Ans-every month Excess nitrate causes a condition called - Correct Ans-blue baby syndrome Water hardness is caused by - Correct Ans-calcium and magnesium Sewer mains should be __ft away from water mains. - Correct Ans-9 Water with a pH less than 7 is considered to be - Correct Ans-acidic Bacti records are kept for ____yrs and chemical records are kept for ___yrs. - Correct Ans-5, 10 Bacti samples have to be returned to the lab within ___hrs of the collection time. - Correct Ans-30 Color in the water supply should be less than _____ units. - Correct Ans-15 Chlorine is ______ times heavier than air. - Correct Ans-2.5 90% of underground pipe failures are related to improper - Correct Ans-backfill and bedding The spoil bank should be located at least ___ft away from the ditch. - Correct Ans-2 Florida Water Florida Water The following minimum residuals is ______mg/L for free chlorine and ____mg/L for total chlorine. - Correct Ans-.2, .5 Public opinion of the water utility is _______ at a standstill. - Correct Ans-never A bacti sample should be taken every ____ft of pipe. - Correct Ans-1000 The most common collection point for a bacti sample is the water tap _______. - Correct Ans-outside the house A standpipe is considered ground storage unless it exceeds _____ft above the highest ________. - Correct Ans-80, service connection ________ protection is the electrochemical method for preventing ________ of metal tanks. - Correct Ans-cathodic, corrosion The _____ is the only cross connection control method approved by _______. - Correct Ans-air gap, tceq _______ on a pipeline depend on the _____ or coefficient of pipe roughness. - Correct Ans-friction loss, c factor __________ occurs whenever there is a ______ in the velocity or direction of water flow. - Correct Ans-water hammer, sudden change The ______ water pressure required by the rules and regulations is ____psi under any and all conditions. - Correct Ans-minimum, 20 100, 150, 200 and 250 are approved classes of _____ _____. - Correct Ans-working pressure ______ is used to anchor pipe bends. - Correct Ans-concrete A general deposit of mineral particles evenly along the inside of the pipe is ________. - Correct Ans-tuberculation Shoring should be used if a ditch is ___ft or deeper. - Correct Ans-5 A written sample writing plan is required for _______ monitoring. - Correct Ans-coliform Ladders should be placed every ___ft in a ditch. - Correct Ans-25 An oxygen deficient atmosphere is defined as one which contains _____ than ______ % oxygen. - Correct Ans-less, 19.5 Characteristics of a Centrifugal Pump: Florida Water Florida Water as the head _____ the discharge ________. - Correct Ans-increases, decreases The operator should leave a ________ of slack in flexible tubing. - Correct Ans gooseneck The most common type of water meter is the ____ ____ meter. - Correct Ans-positive displacement Safe withdrawal weight from a 150lb cylinder is ___lbs and 400lbs from a ____ton cylinder. - Correct Ans-40, 1 The most common valve is the _______. - Correct Ans-gate valve The most commonly used fire hydrants used in distribution systems are the _________. - Correct Ans-dry barrel Hydrants have a _____ point in case a vehicle strikes the hydrant. - Correct Ans breakaway Controlling valves regulate pressure flow ____ and flow _______. - Correct Ans-rates, direction Electricity is the preferred power source for most distribution systems because of ______, reliability and relatively low _______. - Correct Ans-availability, cost 5/8 meters need to be tested at least every _____ to _______ yrs. - Correct Ans-5, 10 When disinfecting a water line, use ____mg/L of chlorine in the main and let stand for ____hrs. - Correct Ans-50, 24 When pressure testing the water main, the test pressure should be ___times as great as the ________ operating pressure. - Correct Ans-1.5, normal Distribution systems are usually laid out in ____ and/or circular designs. - Correct Ans loops Dead ends in a system are usually located on ____ shaped or ____ designs. - Correct Ans-tree, grid An operator may refer to Piezometric elevation, static head, or pressure head as ____ height - Correct Ans-vertical water column 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. - Correct Ans-sufficient, daily, minimum Florida Water Florida Water Electrical demand in a wiring system is determined by the amount of ____ consumed. - Correct Ans-watts Baffling inside a storage facility may be needed to prevent "hot spots" and ____ flows. - Correct Ans-straight through A mass of concrete placed at bends and valve structures to prevent pipeline movement is commonly called a _____. - Correct Ans-thrust block What is the main difference between surface water and groundwater contamination? - Correct Ans-groundwater takes longer to recover after contamination A cross-connection is a connection between an _____ and an _______ water supply. - Correct Ans-approved, unapproved According to the CDC, which mechanism or problem has caused more waterborne disease outbreaks in the US than any other reported factor? - Correct Ans-leaking backflows What type of water meter is used when the water flow widely fluctuates? - Correct Ans compound How can mechanical damage to water meters be avoided? - Correct Ans-place it behind the curb and in a meter box A piston meter is a _____ meter. - Correct Ans-displacement Name one advantage to using centrifugal pumps. - Correct Ans-they are easy to repair When residential water meters become worn, they have the tendency to ____ all flows. - Correct Ans-under register _____% of the earth's surface is ocean. - Correct Ans-75 Out of all the water on earth, less than _____% of freshwater is immediately available to humans. - Correct Ans-1 The term associated with water that evaporates from living plants is referred to as _____. - Correct Ans-evapotranspiration _____% of all the water on earth is saltwater. - Correct Ans-97 Bacti sample bottles are prepared with a chemical called _____ before they are sterilized. - Correct Ans-sodium thiosulfate Florida Water Florida Water Killing disease causing organisms in the water is the primary purpose of ____ in water mains. - Correct Ans-disinfection Liquified chlorine gas will expand ____ times its original volume. - Correct Ans-460 Chlorine gas is ____ times heavier than breathing air. - Correct Ans-2.5 Chlorine gas is considered to be ____% pure. - Correct Ans-100 Bleach is approximately _____% pure. - Correct Ans-5.25 HTH dry powder chlorine is set at ____% purity. - Correct Ans-65 A commonly used method to test for chlorine residual in water is called the ____ method. - Correct Ans-dpd When chlorine gas is added to water, the pH goes down due to the two _____ that form. - Correct Ans-acids Water with a pH of 7.9 is considered to be ______ or _____. - Correct Ans-basic, alkaline A 5' deep pipe trench requires exit ladders every ____ feet and it needs to have approved ____. - Correct Ans-25. shoring When turning a centrifugal pump off, "this" must be done to prevent water hammer. - Correct Ans-close the discharge valve When an operator isolates a motor from an operable system for repair, it is vital that he/she follow a _____/_____ procedure. - Correct Ans-lockout/tagout Horsepower is defined as _____ft-lbs per minute or 746 watts. - Correct Ans-33,000 The rated flow of a water meter, as stated by the manufacturer, is based upon ______ flow. - Correct Ans-continuous What is the minimum setback distance for fire hydrants to avoid large vehicle overhang? - Correct Ans-2ft What is the primary reason for using dry barrel fire hydrants? - Correct Ans-to keep it from freezing 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. - Correct Ans-meet the customers demands Florida Water Florida Water What are the three main components of a centrifugal pump? - Correct Ans-impeller, case and shaft Condensation, evaporation, percolation, and precipitation are all components of the _______ cycle. - Correct Ans-hydrologic The State requires that _____ _____ be kept in storage for disinfection of new water lines. - Correct Ans-calcium hypochlorite If a major chlorine leak occurs, call the supplier and the _____. - Correct Ans-tceq Powder activated carbon is commonly used to treat ____ and ____ problems in water. - Correct Ans-taste, odor The primary goal of coagulation, sedimentation and filtration is to remove ____. - Correct Ans-turbidity The 2 pathogenic protozoans resistant to chlorination are: __________. - Correct Ans giardia and cryptosporidium The process of separating floc from water by gravity is called ____. - Correct Ans sedimentation ______ is the last barrier between the public and giardia or cryptosporidium. - Correct Ans-filtration All public water systems in Texas are required to use _____ as the final disinfectant. - Correct Ans-chlorine Water is stored to meet peak demand and to allow production facilities to operate at _______ rates. - Correct Ans-uniform 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. - Correct Ans-50, 200, 100, 20 The State recommends a TON (Threshold Odor Number) of less than ____. - Correct Ans-3 In Texas ___% of water is used for commercial, industrial or agricultural purposes. - Correct Ans-75 In Texas ag water demands accounts for about ___% of the total water used. - Correct Ans-57 Florida Water Florida Water The federal regulator of drinking water is the ___. - Correct Ans-epa The primary state regulator of water utilities is the ____. - Correct Ans-tceq 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. - Correct Ans-15, 25, 60 Concentrations of fluoride greater than () ___mg.L can cause ____ in teeth over time. - Correct Ans-2, mottling Low doses of heavy metals, such as lead and copper, can cause damage to the ______ _____ ______ over time. - Correct Ans-central nervous system The action level for lead is ____mg.L, and for copper is ____mg/L. - Correct Ans-0.015, 1.3 One by-product of chlorinated water is ____________, a suspected carcinogen when consumed in water over a lifetime. - Correct Ans-trihalomethane Chlorine is combined with ______ to form chloramines to prevent the formation of _._._._. in surface water. - Correct Ans-ammonia, thms Supply systems must maintain a minimum water pressure of ___ psi under normal conditions and at least ___psi during emergencies. - Correct Ans-35, 20 Service tap components usually consist of a tapping saddle, corporation stop, service line tubing, curb stop and a _____. - Correct Ans-meter If a repaired main line must be returned to service quickly, dose it with ____mg/L Chlorine, for ___minutes. - Correct Ans-500, 30 The 2 primary categories of pumps are: ____ and _____. - Correct Ans-centrifugal, positive displacement The "Texas Hazard Communications Act" is known as the "____ ___ ____ Act." - Correct Ans-right to know _____ all shoring from the top down and _____ from the bottom up. - Correct Ans install, remove