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Water distribution practice exam #2 (D1-D2) Questions and Answers 2024
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Water distribution practice exam #2 (D1-D2)
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Water distribution practice exam #2 (D1-D2)
Which process converts ammonia to nitrite and nitrate? - answer Nitrification
What is the maximum advisable rate of chlorine gas removal from a 150- pound
cylinder? - answer40 pounds per day
What is a type of positive displacement water meter? - answer Nutating- disk meter
What is a power-operated mechanism for opening and closing a valve? - answer
Actuator
What is required if a routine sample test positive for total coliform bacteria? - answer
Take repeat samples
Why is a grid layout better than a tree layout for a water distribution system? -
answerless dead-end mains
What is the purpose of a reduced pressure principle assembly? - answerPrevents back-
pressure and back-siphonage
In general, at what depths is shoring required for a trench, if you're excavating in soil? -
answer5 feet or deeper
What occurs after breakpoint chlorination is achieved? - answerFree available chlorine
residual is directly proportional to the amount of chlorine added
What is used to automatically shut-off the flow into a tank when the water level reaches
a pre-determined level? - answerAltitude valve
What would be used to find a chlorine gas leak, which produces white smoke when it
reacts with this substance? - answerSpray ammonia solution vapor near leak
What causes staining of plumbing fixtures? - answerIron & manganese
How long should you flush water before you collect a bacteriological sample? -
answerAs long as necessary to flush stagnant water from the service pipe
What is the purpose of a surge tank? - answerProtect pipelines from sudden high
pressure
, What is recommended if a chlorine gas cylinder is leaking? - answerRotate the cylinder
and turn the leak upwards
What is the purpose of primary MCL? - answerTo protect human health
What problem could be used by water with a pH of 5.3? - answerCorrosión
What is a common way to connect a new pipe to an existing pipe, while the latter is
pressurized and in-service? - answerWet tap or hot tap
What impact would organics have on chlorine demand? - answerIncrease chlorine
demand
What is dichloramine? - answerCombined chlorine residual
What impact does tuberculation have on the interior of a water main? - answerCauses
rough interior of the water due to corrosion
What is used to neutralize chlorine residuals when collecting a water sample for
bacteriological analysis? - answerSodium thiosulfate
What are electrodes and ultrasonic signals used for in a tank? - answerMonitor water
level
Which part of the water main should a new service tap be installed? - answer45
degrees from the top of the water main
What is the purpose of a vacuumed breaker? - answerPrevent back siphonage
Which type of valve is commonly used to isolate water mains during repairs to minimize
service outages? - answerGate valve
Pumping water level - static water level = - answerDrawdown
What is purple pipe used for? - answerReclaimed water
Where is the correct location to install an air release valve - answerTop of pipe
What must be performed prior to entering a confined space? - answerTest for oxygen
deficiency/enrichment, combustible gases, and toxic gases
What does the C- factor of a pipe represent? - answerRoughness of pipe interior
Why should you never empty an underground storage tank when the groundwater level
is high? - answerIt may float the tank and cause damage to the facility
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