Water Distribution Practice Exam -2 (D1-D2) Questions and Correct Answers

Water Distribution Practice Exam #2 (D1-D2) Questions and
Correct Answers
Question 1
Which valve has a movable disc that rotates on a vertical shaft to stop the flow of water?
Correct Answer
Butterfly valve



Question 2
What is one if the drawbacks of a dead-end water main?
Correct Answer
You have to flush more



Question 3
What is a common way to connect a new pipe to an existing pipe, while the latter is pressurized and in-service?
Correct Answer
Wet tap or hot tap




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,Question 4
What are used to protect water mains and ranks from corrosion?
Correct Answer
Anodes



Question 5
What is a process by which water vapor passed into the atmosphere from living plants?
Correct Answer
Evapotranspiration



Question 6
What is dichloramine?
Correct Answer
Combined chlorine residual



Question 7
What is the purpose of painting or coating the interior of a steel tank?
Correct Answer
Minimize corrosion




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, Question 8
What is a white tablet with a 65% available chlorine?
Correct Answer
Calcium hypochlorite



Question 9
What is the primary purpose of a listening device?
Correct Answer
Locate leaks



Question 10
Which part of the water main should a new service tap be installed?
Correct Answer
45 degrees from the top of the water main



Question 11
What is used to prevent backflow into a pump?
Correct Answer
Check valve




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