Water distribution practice exam test 1 already passed!!!! And verified Newest RATED A+

Water distribution practice exam test 1
already passed!!!! And verified Newest
RATED A+
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Which process converts ammonia to nitrite and nitrate? - CORRECT ANSWER-
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Nitrification
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What is the maximum advisable rate of chlorine gas removal from a 150- pound
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cylinder? - CORRECT ANSWER-40 pounds per day
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What is a type of positive displacement water meter? - CORRECT ANSWER-Nutating-
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disk meter
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What is a power-operated mechanism for opening and closing a valve? - CORRECT
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What is required if a routine sample test positive for total coliform bacteria? - CORRECT
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ANSWER-Take repeat samples
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Why is a grid layout better than a tree layout for a water distribution system? -
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CORRECT ANSWER-Less dead-end mains
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What is the purpose of a reduced pressure principle assembly? - CORRECT ANSWER-
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Prevents back-pressure and back-siphonage
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In general, at what depths is shoring required for a trench, if you're excavating in soil? -
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CORRECT ANSWER-5 feet or deeper
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What occurs after breakpoint chlorination is achieved? - CORRECT ANSWER-Free
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available chlorine residual is directly proportional to the amount of chlorine added
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What is used to automatically shut-off the flow into a tank when the water level reaches
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a pre-determined level? - CORRECT ANSWER-Altitude valve
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What would be used to find a chlorine gas leak, which produces white smoke when it
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reacts with this substance? - CORRECT ANSWER-Spray ammonia solution vapor near
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leak
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What causes staining of plumbing fixtures? - CORRECT ANSWER-Iron & manganese
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How long should you flush water before you collect a bacteriological sample? - CORRECT
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ANSWER-As long as necessary to flush stagnant water from the service pipe
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What is the purpose of a surge tank? - CORRECT ANSWER-Protect pipelines from
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sudden high pressure
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What is recommended if a chlorine gas cylinder is leaking? - CORRECT ANSWER-
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Rotate the cylinder and turn the leak upwards
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What is the purpose of primary MCL? - CORRECT ANSWER-To protect human health
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What problem could be used by water with a pH of 5.3? - CORRECT ANSWER-
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Corrosión
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What is a common way to connect a new pipe to an existing pipe, while the latter is
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pressurized and in-service? - CORRECT ANSWER-Wet tap or hot tap
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What impact would organics have on chlorine demand? - CORRECT ANSWER-
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Increase chlorine demand
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What is dichloramine? - CORRECT ANSWER-Combined chlorine residual
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What impact does tuberculation have on the interior of a water main? - CORRECT
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ANSWER-Causes rough interior of the water due to corrosion
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What is used to neutralize chlorine residuals when collecting a water sample for
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bacteriological analysis? - CORRECT ANSWER-Sodium thiosulfate
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What are electrodes and ultrasonic signals used for in a tank? - CORRECT ANSWER-
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Monitor water level
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Which part of the water main should a new service tap be installed? - CORRECT
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ANSWER-45 degrees from the top of the water main
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What is the purpose of a vacuumed breaker? - CORRECT ANSWER-Prevent back
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siphonage
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Which type of valve is commonly used to isolate water mains during repairs to minimize
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service outages? - CORRECT ANSWER-Gate valve
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Pumping water level - static water level = - CORRECT ANSWER-Drawdown
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What is purple pipe used for? - CORRECT ANSWER-Reclaimed water
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Where is the correct location to install an air release valve - CORRECT ANSWER-Top
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of pipe
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What must be performed prior to entering a confined space? - CORRECT ANSWER-
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Test for oxygen deficiency/enrichment, combustible gases, and toxic gases
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What does the C- factor of a pipe represent? - CORRECT ANSWER-Roughness of pipe
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interior
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Why should you never empty an underground storage tank when the groundwater level is
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high? - CORRECT ANSWER-It may float the tank and cause damage to the facility
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What is used to determine the bacteriological quality of a water supply? - CORRECT
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ANSWER-Presence-absence of coliform bacteria
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Which valve is available as a swing, double door, or slanting disc? - CORRECT
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ANSWER-Check valve
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What is used to check the effectiveness of disinfection? - CORRECT ANSWER-Test for
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coliform bacteria ( bacteriological result )
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What are used to protect water mains and ranks from corrosion? - CORRECT
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ANSWER-Anodes
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What is a common customer complaint during or immediately after fishing the water
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main? - CORRECT ANSWER-Cloudiness and color in water
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