Practice Exams Water Distribution Operator Exam 2 Questions and Answers 100% Correct!

Which process converts ammonia to nitrites and nitrates? - ANSWER-Nitrification What is the maximum advisable rate of chlorine gas removal from a 150-pound cylinder? - ANSWER-40 lbs/day Which of the following is a type of positive displacement water meter? - ANSWER-nutating-disk meter __________ 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 (branching) layout for a water distribution system? - ANSWER-less dead-end mains What is the purpose of a reduced pressure principle assembly? - ANSWER-prevents back-pressure and back-siphonage in general, at what depths is shoring required for a trench, if you're excavating in soil? - ANSWER-5 feet or deeper What occurs after breakpoint chlorination is achieved? - ANSWER-Free 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 predetermined level? - ANSWER-Altitude valve What could be used to find a chlorine gas leak, which produces white smoke when it reacts with this substance? - ANSWER-Spray ammonia solution vapor near leak What causes staining of plumbing fixtures? - ANSWER-Iron and manganese