Download Class C Water Operator License Exam: Questions and Answers and more Exams Nursing in PDF only on Docsity!
Question & Answers 2025
Ammonia mixed with chlorine gas creates a - Correct Answers ✅white smoke The most difficult part of a water distribution operator's job. - Correct Answers ✅furnish a continuous supply Physical connection between a safe and potentially unsafe water source. - Correct Answers ✅cross connection A distribution system is a - Correct Answers ✅looped system Dead end mains should be flushed - Correct Answers ✅every month Excess nitrate causes a condition called - Correct Answers ✅blue baby syndrome Water hardness is caused by - Correct Answers ✅calcium and magnesium Sewer mains should be __ft away from water mains. - Correct Answers ✅ 9
Question & Answers 2025
Water with a pH less than 7 is considered to be - Correct Answers ✅acidic Bacti records are kept for ____yrs and chemical records are kept for ___yrs. - Correct Answers ✅5, 10 Bacti samples have to be returned to the lab within ___hrs of the collection time. - Correct Answers ✅ 30 Color in the water supply should be less than _____ units. - Correct Answers ✅ 15 Chlorine is ______ times heavier than air. - Correct Answers ✅2. 90% of underground pipe failures are related to improper - Correct Answers ✅backfill and bedding The spoil bank should be located at least ___ft away from the ditch. - Correct Answers ✅ 2 The following minimum residuals is ______mg/L for free chlorine and ____mg/L for total chlorine. - Correct Answers ✅.2,.
Question & Answers 2025
__________ occurs whenever there is a ______ in the velocity or direction of water flow. - Correct Answers ✅water hammer, sudden change The ______ water pressure required by the rules and regulations is ____psi under any and all conditions. - Correct Answers ✅minimum, 20 100, 150, 200 and 250 are approved classes of _____ _____. - Correct Answers ✅working pressure ______ is used to anchor pipe bends. - Correct Answers ✅concrete A general deposit of mineral particles evenly along the inside of the pipe is ________. - Correct Answers ✅tuberculation Shoring should be used if a ditch is ___ft or deeper. - Correct Answers ✅ 5 A written sample writing plan is required for _______ monitoring. - Correct Answers ✅coliform Ladders should be placed every ___ft in a ditch. - Correct Answers ✅ 25
Question & Answers 2025
An oxygen deficient atmosphere is defined as one which contains _____ than ______ % oxygen. - Correct Answers ✅less, 19. Characteristics of a Centrifugal Pump: as the head _____ the discharge ________. - Correct Answers ✅increases, decreases The operator should leave a ________ of slack in flexible tubing. - Correct Answers ✅gooseneck The most common type of water meter is the ____ ____ meter. - Correct Answers ✅positive displacement Safe withdrawal weight from a 150lb cylinder is ___lbs and 400lbs from a ____ton cylinder. - Correct Answers ✅40, 1 The most common valve is the _______. - Correct Answers ✅gate valve The most commonly used fire hydrants used in distribution systems are the _________. - Correct Answers ✅dry barrel Hydrants have a _____ point in case the hydrant is struck by a vehicle. - Correct Answers ✅breakaway
Question & Answers 2025
An operator may refer to Piezometric elevation, static head, or pressure head as ____ height - Correct Answers ✅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 Answers ✅sufficient, daily, minimum Electrical demand in a wiring system is determined by the amount of ____ consumed. - Correct Answers ✅watts Baffling inside a storage facility may be needed to prevent "hot spots" and ____ flows. - Correct Answers ✅straight through A mass of concrete placed at bends and valve structures to prevent pipeline movement is commonly called a _____. - Correct Answers ✅thrust block What is the main difference between surface water and groundwater contamination? - Correct Answers ✅groundwater takes longer to recover after contamination
Question & Answers 2025
A cross-connection is a connection between an _____ and an _______ water supply. - Correct Answers ✅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 Answers ✅leaking backflows What type of water meter is used when the water flow widely fluctuates? - Correct Answers ✅compound How can mechanical damage to water meters be avoided? - Correct Answers ✅place it behind the curb and in a meter box A piston meter is a _____ meter. - Correct Answers ✅displacement Name one advantage to using centrifugal pumps. - Correct Answers ✅they are easy to repair When residential water meters become worn, they have the tendency to ____ all flows. - Correct Answers ✅under register _____% of the earth's surface is ocean. - Correct Answers ✅ 75
Question & Answers 2025
HTH dry powder chlorine is set at ____% purity. - Correct Answers ✅ 65 A commonly used method to test for chlorine residual in water is called the ____ method. - Correct Answers ✅dpd When chlorine gas is added to water, the pH goes down due to the two _____ that form. - Correct Answers ✅acids Water with a pH of 7.9 is considered to be ______ or _____. - Correct Answers ✅basic, alkaline A 5' deep pipe trench requires exit ladders every ____ feet and it needs to have approved ____. - Correct Answers ✅25. shoring When turning a centrifugal pump off, "this" must be done to prevent water hammer. - Correct Answers ✅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 Answers ✅lockout/tagout
Question & Answers 2025
Horsepower is defined as _____ft-lbs per minute or 746 watts. - Correct Answers ✅33, The rated flow of a water meter, as stated by the manufacturer, is based upon ______ flow. - Correct Answers ✅continuous What is the minimum setback distance for fire hydrants to avoid large vehicle overhang? - Correct Answers ✅2ft What is the primary reason for using dry barrel fire hydrants? - Correct Answers ✅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 Answers ✅meet the customers demands What are the three main components of a centrifugal pump? - Correct Answers ✅impeller, case and shaft Condensation, evaporation, percolation, and precipitation are all components of the _______ cycle. - Correct Answers ✅hydrologic
Question & Answers 2025
Water is stored to meet peak demand and to allow production facilities to operate at _______ rates. - Correct Answers ✅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 Answers ✅50, 200, 100, 20 The State recommends a TON (Threshold Odor Number) of less than ____. - Correct Answers ✅ 3 In Texas ___% of water is used for commercial, industrial or agricultural purposes. - Correct Answers ✅ 75 In Texas ag water demands accounts for about ___% of the total water used. - Correct Answers ✅ 57 The federal regulator of drinking water is the ___. - Correct Answers ✅epa The primary state regulator of water utilities is the ____. - Correct Answers ✅tceq
Question & Answers 2025
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 Answers ✅15, 25, 60 Concentrations of fluoride greater than (>) _mg.L can cause ____ in teeth over time. - Correct Answers ✅2, mottling Low doses of heavy metals, such as lead and copper, can cause damage to the ______ _____ ______ over time. - Correct Answers ✅central nervous system The action level for lead is ____mg.L, and for copper is ____mg/L. - Correct Answers ✅0.015, 1. One by-product of chlorinated water is ____________, a suspected carcinogen when consumed in water over a lifetime. - Correct Answers ✅trihalomethane Chlorine is combined with ______ to form chloramines to prevent the formation of .... in surface water. - Correct Answers ✅ammonia, thms
