Download Water Distribution Practice Exam #2 (D1-D2) Actual Exam Questions and Correct Answers (Ver and more Exams Nursing in PDF only on Docsity!
Water Distribution Practice Exam
(D1-D2) Actual Exam Questions and
Correct Answers (Verified, Detailed
Answers) A Grade.
_____________Quiz____________? Which process converts ammonia to nitrite and nitrate? -
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Nitrification _____________Quiz____________? What is the maximum advisable rate of chlorine gas removal from a 150- pound cylinder? -
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40 pounds per day _____________Quiz____________? What is a type of positive displacement water meter? -
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Nutating- disk meter _____________Quiz____________? What is a power-operated mechanism for opening and closing a valve? -
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Actuator _____________Quiz____________? What is required if a routine sample test positive for total coliform bacteria? -
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Take repeat samples _____________Quiz____________? Why is a grid layout better than a tree layout for a water distribution system? -
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Less dead-end mains _____________Quiz____________? What is the purpose of a reduced pressure principle assembly? -
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Prevents back-pressure and back-siphonage _____________Quiz____________? In general, at what depths is shoring required for a trench, if you're excavating in soil? -
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5 feet or deeper
How long should you flush water before you collect a bacteriological sample? -
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As long as necessary to flush stagnant water from the service pipe _____________Quiz____________? What is the purpose of a surge tank? -
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Protect pipelines from sudden high pressure _____________Quiz____________? What is recommended if a chlorine gas cylinder is leaking? -
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Rotate the cylinder and turn the leak upwards _____________Quiz____________? What is the purpose of primary MCL? -
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To protect human health _____________Quiz____________? What problem could be used by water with a pH of 5.3? -
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Corrosiรณn
_____________Quiz____________? What is a common way to connect a new pipe to an existing pipe, while the latter is pressurized and in-service? -
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Wet tap or hot tap _____________Quiz____________? What impact would organics have on chlorine demand? -
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Increase chlorine demand _____________Quiz____________? What is dichloramine? -
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Combined chlorine residual _____________Quiz____________? What impact does tuberculation have on the interior of a water main? -
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Causes rough interior of the water due to corrosion _____________Quiz____________?
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Gate valve _____________Quiz____________? Pumping water level - static water level = -
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Drawdown _____________Quiz____________? What is purple pipe used for? -
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Reclaimed water _____________Quiz____________? Where is the correct location to install an air release valve -
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Top of pipe _____________Quiz____________? What must be performed prior to entering a confined space? -
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Test for oxygen deficiency/enrichment, combustible gases, and toxic gases
_____________Quiz____________? What does the C- factor of a pipe represent? -
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Roughness of pipe interior _____________Quiz____________? Why should you never empty an underground storage tank when the groundwater level is high?
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It may float the tank and cause damage to the facility _____________Quiz____________? What is used to determine the bacteriological quality of a water supply? -
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Presence-absence of coliform bacteria _____________Quiz____________? Which valve is available as a swing, double door, or slanting disc? -
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Check valve _____________Quiz____________? What is used to check the effectiveness of disinfection? -
_____________Quiz____________? What is tested in the field during the collection of bacteriological sample? -
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Test for chlorine residual _____________Quiz____________? Which type of water meter diverts some of the flow through a bypass meter, which is calibrated to register the total flow through the main pipelines? -
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Proportional meter _____________Quiz____________? What must be true if trihalomethane is detected in the water? -
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Disinfection by products have formed _____________Quiz____________? What causes a pump to sound like it is pumping rocks? -
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Cavitation _____________Quiz____________?
What are the three most commonly used forms of chlorine for disinfection in the water industry? -
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Chlorine gas, calcium hypochlorite, and sodium hypochlorite _____________Quiz____________? What will reduce flow rate in a pipe? -
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Encrustation _____________Quiz____________? What is the source of E.coli? -
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Intestinal tract of warm blooded animals _____________Quiz____________? What is the primary purpose of a listening device? -
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Locate leaks _____________Quiz____________? What does a positive result from a presence-absence test indicate? -
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_____________Quiz____________? What causes water to appear red? -
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Iron _____________Quiz____________? What could be used to indentify the corrosiveness of water? -
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pH _____________Quiz____________? What will happen to the maximum flow rate from a chlorine gas cylinder if the temperature of the cylinder decreases? -
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It decreases _____________Quiz____________? What is a white tablet with a 65% available chlorine? -
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Calcium hypochlorite _____________Quiz____________? Which type of water storage facility has a height that is greater than its diameter? -
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Standpipe _____________Quiz____________? What is required if you cannot perform a bacteriological test within one hour of sampling? -
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Refrigerate the sample _____________Quiz____________? What causes scaling in the pipe? -
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Hardness _____________Quiz____________? Which valve has a movable disc that rotates on a vertical shaft to stop the flow of water? -
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Butterfly valve _____________Quiz____________? What will happen if the pressure in the water main drops below zero? -
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Back - siphonage
Dechlorinate the water _____________Quiz____________? What is the purpose of painting or coating the interior of a steel tank? -
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Minimize corrosion _____________Quiz____________? What is an approved backflow prevention device for a service connection that does not pose a health hazard? -
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Double check valve _____________Quiz____________? What used to add head to water and convey it to higher elevations? -
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Booster pumps _____________Quiz____________? Which standards are commonly used to disinfect a new water main? -
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AWWA
_____________Quiz____________? If the organic concentration in a new water main increases, what is the impact to chlorine demand? -
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Chlorine demand increases _____________Quiz____________? What are the essential for killing harmful bacteria in water? -
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Adequate chlorine contact time and chlorine residual concentration _____________Quiz____________? If a tank has disinfected due to possible contamination, which of the following is true? -
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It cannot be returned to service until bacteriological test results show that samples tested negative for coliform bacteria _____________Quiz____________? What is used to prevent backflow into a pump? -
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Check valve _____________Quiz____________?
Back-pressure _____________Quiz____________? What is always required after costing the tank interior? -
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Disinfection _____________Quiz____________? What is a process by which water vapor passed into the atmosphere from living plants? -
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Evapotranspiration _____________Quiz____________? What is installed at the top of a well to prevent contamination of groundwater from the surface? -
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Sanitary seal _____________Quiz____________? Safe access and egress such as a ladder must be located? -
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25 feet of a trench that is 4 feet or deeper
_____________Quiz____________? What is a type of positive displacement pump? -
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Reciprocating or piston pump _____________Quiz____________? What is an underground layer of porous water bearing material from which groundwater can be extracted using a well? -
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Aquifer
