Water Distribution Grade 1 Certification exam questions and answers elaborated

Water Distribution Grade 1 Certification exam questions and answers elaborated What is the general definition of an ion? An _________ with a positive or negative charge - CORRECT ANSWER-Atom A continuous positive pressure in a distribution system is essential for preventing what event? - CORRECT ANSWER-Backflow Event _____________ water pressure must be maintained to ensure adequate customer service during peak flow periods. However, minimum positive pressure must be maintained in mains to protect against backflow or backsiphonage from crossconnections. - CORRECT ANSWER-Minimum Name the most common CAUSE for public water supply contamination. _________________ or cross-connection - CORRECT ANSWER-Backflow What does a backsiphonage condition usually cause? __________ pressure or negative pressure on the service or supply side. - CORRECT ANSWER-Reduced What does a double check valve backflow assembly provide effective protection from? Both backpressure and backsiphonage of ____________. - CORRECT ANSWERPollution What is equipment that utilizes water for cooling, lubrication, washing or as a solvent always susceptible to? - CORRECT ANSWER-Cross-Connection What is the difference between a reduced pressure principle backflow device and a double check backflow device? The RP has a ______________. - CORRECT ANSWER-Relief Valve What is the maximum time period between having a backflow device tested by a certified backflow tester? ______________ year. - CORRECT ANSWER-1 What is the regulatory definition of a cross-connection in a water supply? A physical connection between a public water system and any source of water or other substance that may lead to contamination of the water provided by the _____________ through backflow. - CORRECT ANSWER-PWS What is the name of a type of valve that reduces the differential pressure across a closed disk making the main valve easier to open and close? - CORRECT ANSWERBypass Valve