Water Distribution Grade 1 Certification ADEQ Practice Exam

Water Distribution Grade 1 Certification ADEQ Practice Exam What is the general definition of an ion? An _________ with a positive or negative charge Ans- Atom A continuous positive pressure in a distribution system is essential for preventing what event? AnsBackflow 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 cross-connections. Ans- Minimum Name the most common CAUSE for public water supply contamination. _________________ or crossconnection Ans- Backflow What does a backsiphonage condition usually cause? __________ pressure or negative pressure on the service or supply side. Ans- Reduced What does a double check valve backflow assembly provide effective protection from? Both backpressure and backsiphonage of ____________. Ans- Pollution What is equipment that utilizes water for cooling, lubrication, washing or as a solvent always susceptible to? Ans- Cross-Connection What is the difference between a reduced pressure principle backflow device and a double check backflow device? The RP has a ______________. Ans- Relief Valve What is the maximum time period between having a backflow device tested by a certified backflow tester? ______________ year. Ans- 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. Ans- 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? Ans- Bypass Valve As soon as Cl2 gas enters the throat area, a victim will sense a sudden stricture in this area-Nature's way of signaling to prevent passage of the gas to the lungs. At this point, the victim must attempt to do two things: get out of the area of the leak, proceeding upwind, and to take only very short breaths through the mouth. Normal breathing will cause __________, which must be prevented if possible. AnsCoughing Chlorine gas causes suffocation, constriction of the chest, tightness in the throat, and edema of the ______________. Ans- Lungs _______________ available chlorine is very effective in killing bacteria. Ans- Free How should an operator store an empty chlorine cylinder? ____________, tagged as empty. AnsUpright If a chlorine leak occurs, where will chlorine gas accumulate? Near the ____________ of the tank. AnsBottom What effect does chlorine gas have on the sense of smell? It produces olfactory _______________. AnsFatigue What is the primary safety concern when using chlorine gas as opposed to calcium hypochlorite or sodium hypochlorite? The potential for a _____________ leak. Ans- Gas What may occur due to chronic exposure to low concentrations of chlorine gas? Chronic exposure may cause corrosion of the _____________. Ans- Teeth What is the process called that changes water vapor to tiny droplets or ice crystals? Ans- Condensation What is the unit of measurement for sound? Ans- Decibels What happens if grease comes in contact with the winding of a motor? Ans- The winding insulation my deteriorate. What is the most common type of valve used in isolating a small or medium sized section of a distribution system? Ans- Gate What is a possible result of over greasing a bearing? There is extreme _____________ in the bearing chamber causing heat and scoring of the shaft. Ans- Friction What is meant by the term "peak demand?" The _____________ momentary load placed on a water treatment plant, pumping station or distribution system. Ans- Maximum What is the range of the pH scale? between _____________-14. Ans- Zero What does a Bellows-type sensor reacts to a change in? _________________. Ans- Pressure Centrifugal pumps do not generate suction unless the impeller is submerged in water. If a pump is located above the level of water what must be provided on the suction piping to hold the prime? AnsFoot Valve What causes pump cavitation? A suction line may be ____________ or the pump is above the waterline. You have overpumped the well. Ans- Clogged What does continuous leakage from a mechanical seal on a pump indicate? The mechanical seal needs to be ___________________. Ans- Replaced What is a possible cause of a scored shaft sleeve? The _____________ has broken down Ans- Packing What is one disadvantage of a centrifugal pump? It is not______________. Ans- Self-Priming What is the best seal to use for a pump operating under high suction head conditions? A _____________ seal. Ans- Mechanical What is the common method used to secure an impeller to the shaft on double-suction pump? A _____________ and a tight fit. Ans- Key What is the main purpose of the wear rings in a centrifugal double suction pump? The wear rings maintain a flow _______________ between the impelle