D2 Water Distribution Operator Practice Exam 2 Questions and Answers.

D2 Water Distribution Operator Practice Exam 2 Questions
and Answers
Question 1
What could happen if the water pressure on the customer side exceeds the pressure in the water main?
Correct Answer
Back pressure



Question 2
What is the source of E. Coli?
Correct Answer
Intestinal tract of warm blooded animals



Question 3
What is a source of water main contamination that is unique to rural areas?
Correct Answer
Septic leach fields




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,Question 4
What are the electrodes and ultrasonic signals used for in a tank?
Correct Answer
Monitor water level



Question 5
Which part of a chlorinator is fitted with venturi nozzle, and creates a vacuum that moves the chlorine gas?
Correct Answer
ejector



Question 6
What impact would organics have on chlorine demand?
Correct Answer
Increase chlorine demand



Question 7
What causes a pump to sound like it is pumping rocks?
Correct Answer
cavitation




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, Question 8
What is the purpose of painting or coating the interior of a steel tank?
Correct Answer
minimize corrosion



Question 9
What will happen to the maximum flow rate from a chlorine gas cylinder if the temperature of the cylinder decreases?
Correct Answer
decreases



Question 10
Which of the following is a process by which water vapor passes into the atmosphere from living plants?
Correct Answer
Evapotranspiration



Question 11
What is a white tablet with 65% available chlorine?
Correct Answer
calcium hypochlorite




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