Class C Water Operator License Exam With 100% Correct Answers

Ammonia mixed with chlorine gas creates a - ANSWER-white smoke The most difficult part of a water distribution operator's job. - ANSWER-furnish a continuous supply Physical connection between a safe and potentially unsafe water source. - ANSWERcross connection A distribution system is a - ANSWER-looped system Dead end mains should be flushed - ANSWER-every month Excess nitrate causes a condition called - ANSWER-blue baby syndrome Water hardness is caused by - ANSWER-calcium and magnesium Sewer mains should be __ft away from water mains. - ANSWER-9 Water with a pH less than 7 is considered to be - ANSWER-acidic Bacti records are kept for ____yrs and chemical records are kept for ___yrs. - ANSWER-5, 10 Bacti samples have to be returned to the lab within ___hrs of the collection time. - ANSWER-30 Color in the water supply should be less than _____ units. - ANSWER-15 Chlorine is ______ times heavier than air. - ANSWER-2.5 90% of underground pipe failures are related to improper - ANSWER-backfill and bedding The spoil bank should be located at least ___ft away from the ditch. - ANSWER-2 The following minimum residuals is ______mg/L for free chlorine and ____mg/L for total chlorine. - ANSWER-.2, .5 Public opinion of the water utility is _______ at a standstill. - ANSWER-never A bacti sample should be taken every ____ft of pipe. - ANSWER-1000 The most common collection point for a bacti sample is the water tap _______. - ANSWER-outside the house A standpipe is considered ground storage unless it exceeds _____ft above the highest ________. - ANSWER-80, service connection ________ protection is the electrochemical method for preventing ________ of metal tanks. - ANSWER-cathodic, corrosion The _____ is the only cross connection control method approved by _______. - ANSWER-air gap, tceq _______ on a pipeline depend on the _____ or coefficient of pipe roughness. - ANSWER-friction loss, c factor __________ occurs whenever there is a ______ in the velocity or direction of water flow. - ANSWER-water hammer, sudden change The ______ water pressure required by the rules and regulations is ____psi under any and all conditions. - ANSWER-minimum, 20 100, 150, 200 and 250 are approved classes of _____ _____. - ANSWER-working pressure ______ is used to anchor pipe bends. - ANSWER-concrete A general deposit of mineral particles evenly along the inside of the pipe is ________. - ANSWER-tuberculation Shoring should be used if a ditch is ___ft or deeper. - ANSWER-5 A written sample writing plan is required for _______ monitoring. - ANSWER-coliform Ladders should be placed every ___ft in a ditch. - ANSWER-25 An oxygen deficient atmosphere is defined as one which contains _____ than ______ % oxygen. - ANSWER-less, 19.5 Characteristics of a Centrifugal Pump: as the head _____ the discharge ________. - ANSWER-increases, decreases The operator should leave a ________ of slack in flexible tubing. - ANSWERgooseneck The most common type of water meter is the ____ ____ meter. - ANSWER-positive displacement Safe withdrawal weight from a 150lb cylinder is ___lbs and 400lbs from a ____ton cylinder. - ANSWER-40, 1 The most common valve is the _______. - ANSWER-gate valve The most commonly used fire hydrants used in distribution systems are the _________. - ANSWER-dry barrel Hydrants have a _____ point in case the hydrant is struck by a vehicle. - ANSWERbreakaway Controlling valves regulate pressure flow ____ and flow _______. - ANSWER-rates, direction Electricity is the preferred power source for most distribution systems because of ______, reliability and relatively low _______. - ANSWER-availability, cost 5/8 meters need to be tested at least every _____ to _______ yrs. - ANSWER-5, 10 When disinfecting a water line, use ____mg/L of chlorine in the main and let stand for ____hrs. - ANSWER-50, 24 When pressure testing the water main, the test pressure should be ___times as great as the ________ operating pressure. - ANSWER-1.5, normal Distribution systems are usually laid out in ____ and/or circular designs. - ANSWERloops Dead ends in a system are usually located on ____ shaped or ____ designs. - ANSWER-tree, grid An operator may refer to Piezometric elevation, static head, or pressure head as ____ height - ANSWER-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. - ANSWER-sufficient, daily, minimum Electrical demand in a wiring system is determined by the amount of ____ consumed. - ANSWER-watts Baffling inside a storage facility may be needed to prevent "hot spots" and ____ flows. - ANSW