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Class C Water Operator License Exam Questions and answers | Updated 2024/25 RATED A+
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Class C Water Operator License Exam Questions and answers | Updated 2024/25 RATED A+
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Class C Water Operator License ExamQuestions and answers | Updated
2024/25 RATED A+
Ammonia mixed with chlorine gas creates a - white smoke ii ii ii ii ii ii ii ii ii ii ii
ii The most difficult part of a water distribution operator's job. - furnish a continuous supply
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Physical connection between a safe and potentially unsafe water source. - cross
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connection
ii
ii A distribution system is a - looped system
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ii Dead end mains should be flushed - every month
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ii Excess nitrate causes a condition called - blue baby syndrome
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ii Water hardness is caused by - calcium and magnesium
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ii Sewer mains should be __ft away from water mains. - 9
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ii Water with a pH less than 7 is considered to be - acidic
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ii Bacti records are kept for ____yrs and chemical records are kept for ___yrs. - 5, 10
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ii Bacti samples have to be returned to the lab within ___hrs of the collection time. - 30
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ii Color in the water supply should be less than _____ units. - 15
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ii Chlorine is ______ times heavier than air. - 2.5 ii ii ii ii ii ii ii ii ii ii
ii 90% of underground pipe failures are related to improper - backfill and bedding
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ii The spoil bank should be located at least ___ft away from the ditch. - 2
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The following minimum residuals is ______mg/L for free chlorine and ____mg/L for total
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chlorine. - .2, .5
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ii Public opinion of the water utility is _______ at a standstill. - never
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ii A bacti sample should be taken every ____ft of pipe. - 1000
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, The most common collection point for a bacti sample is the water tap _______. - outside
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the house
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A standpipe is considered ground storage unless it exceeds _____ft above the highest
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________. - 80, service connection
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________ protection is the electrochemical method for preventing ________ of metal
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tanks. - cathodic, corrosion
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The _____ is the only cross connection control method approved by _______. - air gap,
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tceq
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_______ on a pipeline depend on the _____ or coefficient of pipe roughness. - friction
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loss, c factor
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__________ occurs whenever there is a ______ in the velocity or direction of water flow. -
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water hammer, sudden change
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The ______ water pressure required by the rules and regulations is ____psi under any
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and all conditions. - minimum, 20
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ii 100, 150, 200 and 250 are approved classes of _____ _____. - working pressure
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ii ______ is used to anchor pipe bends. - concrete ii ii ii ii ii ii ii ii ii ii
A general deposit of mineral particles evenly along the inside of the pipe is ________. -
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tuberculation
ii
ii Shoring should be used if a ditch is ___ft or deeper. - 5
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ii A written sample writing plan is required for _______ monitoring. - coliform
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ii Ladders should be placed every ___ft in a ditch. - 25 ii ii ii ii ii ii ii ii ii ii ii ii
An oxygen deficient atmosphere is defined as one which contains _____ than ______ %
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oxygen. - less, 19.5
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Characteristics of a Centrifugal Pump:
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as the head _____ the discharge ________. - increases, decreases
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ii The operator should leave a ________ of slack in flexible tubing. - gooseneck
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ii The most common type of water meter is the ____ ____ meter. - positive displacement
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Safe withdrawal weight from a 150lb cylinder is ___lbs and 400lbs from a ____ton
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cylinder. - 40, 1
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