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Exam (elaborations)

Water Treatment Operator Exam: Distribution & Backflow Study Guide

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Pass your water operator certification. Covers backflow prevention, chlorine safety, pumps, valves, confined space, and Arizona ADEQ treatment exam study guide, distribution system operator, backflow prevention certification, chlorine gas safety, centrifugal pump operation, confined space entry water, ADEQ rules Arizona, water operator Grade 1 2 3 4, cross connection control, reduced pressure principle, double check valve assembly, water hammer prevention, pump cavitation causes, foot valve priming, mechanical seal pump, VOC monitoring drinking water, trihalomethanes rule, sanitary survey requirements, water storage tank coating, tapping valve water main, water operator certification prep, environmental technology study aid

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Institution
Water Treatment Operator
Course
Water Treatment Operator

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1. What is the general definition of an ion? Anh. with a positive or
h. h. h. h. h. h. h. h. h. h. h.


negative charge: Atom
h. h. h.


2. A continuous positive pressure in a distribution system is essential
h. h. h. h. h. h. h. h. h.


for preventing what event?: Backflow Event
h. h. h. h. h. h.


3. water pressure must be maintained to ensure adequate cus- h. h. h. h. h. h. h. h.


tomer service during peak flow periods. However, minimum positive pressure
h. h. h. h. h. h. h. h. h. h.


must be maintained in mains to protect against backflow or
h. h. h. h. h. h. h. h. h. h.


backsiphonage from cross-connections.: Minimum
h. h. h. h.


4. Name the most common CAUSE for public water supply contamination.
h. h. h. h. h. h. h. h. h.


or cross-connection: Backflow h. h.


5. What does a backsiphonage condition usually cause?
h. pressure h. h. h. h. h. h.


or negative pressure on the service or supply side.: Reduced
h. h. h. h. h. h. h. h. h. h.


6. What does a double check valve backflow assembly provide effective
h. h. h. h. h. h. h. h. h.


pro- tection from? Both backpressure and backsiphonage of
h. h. .: Pol- h. h. h. h. h. h. h. h.


lution
h.


7. What is equipment that utilizes water for cooling, lubrication, washing or as
h. h. h. h. h. h. h. h. h. h. h.


a solvent always susceptible to?: Cross-Connection
h. h. h. h. h. h.


8. What is the difference between a reduced pressure principle backflow
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device and a double check backflow device? The RP has a
h. h. .-h. h. h. h. h. h. h. h. h. h.


: Relief Valve
h. h.


9. What is the maximum time period between having a backflow device tested
h. h. h. h. h. h. h. h. h. h. h.


by a certified backflow tester? _____________ year.: 1
h. h. h. h. h. h.


10. What is the regulatory definition of a cross-connection in a water
h. h. h. h. h. h. h. h. h. h.


supply? A physical connection between a public water system and any
h. h. h. h. h. h. h. h. h. h. h.


source of water or other substance that may lead to contamination of the
h. h. h. h. h. h. h. h. h. h. h. h. h.


water provided by the
h. through backflow.: PWS
h. h. h. h. h. h.


11. What is the name of a type of valve that reduces the differential
h. h. h. h. h. h. h. h. h. h. h. h.


pressure across a closed disk making the main valve easier to open and
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close?: Bypass Valve
h. h. h.


12. As soon as Cl2 gas enters the throat area, a victim will sense a sudden
h. h. h. h. h. h. h. h. h. h. h. h. h. h.


stricture in this area-Nature's way of signaling to prevent passage of the
h. h. h. h. h. h. h. h. h. h. h. h.


gas to the lungs. At this point, the victim must attempt to do two things: get
h. h. h. h. h. h. h. h. h. h. h. h. h. h. h. h.


out of the area of the leak, proceeding upwind, and to take only very short
h. h. h. h. h. h. h. h. h. h. h. h. h. h. h.


breaths through the mouth. Normal breathing will cause , which must be
h. h. h. h. h. h. h. h. h. h. h. h.


prevented if possible.: Coughing
h. h. h. h.


13. Chlorine gas causes suffocation, constriction of the chest, tightness in the h. h. h. h. h. h. h. h. h. h.


throat, and edema of the ............................ Lungs
h. h. h. h. h.


14. available chlorine is very effective in killing bacteria.: - h. h. h. h. h. h. h. h.


Free
1 h./ h.
11

, 15. How should an operator store an empty chlorine cylinder?
h. , h. h. h. h. h. h. h. h.


tagged as empty.: Upright
h. h. h. h.


16. If a chlorine leak occurs, where will chlorine gas accumulate? Near the
h. h. h. h. h. h. h. h. h. h. h.


of the tank.: Bottom h. h. h.


17. What effect does chlorine gas have on the sense of smell? It
h. h. h. h. h. h. h. h. h. h. h.


produces olfactory
h. .: Fatigue h. h. h.


18. What is the primary safety concern when using chlorine gas as op-
h. h. h. h. h. h. h. h. h. h. h.


posed to calcium hypochlorite or sodium hypochlorite? The potential for
h. h. h. h. h. h. h. h. h. h.


a
h.


leak.: Gas h.


19. What may occur due to chronic exposure to low concentrations of chlorine
h. h. h. h. h. h. h. h. h. h. h.


gas? Chronic exposure may cause corrosion of the
h. h. .: Teeth
h. h. h. h. h. h. h. h.


20. What is the process called that changes water vapor to tiny droplets or ice
h. h. h. h. h. h. h. h. h. h. h. h. h.


crystals?: Condensation
h. h.


21. What is the unit of measurement for sound?: Decibels
h. h. h. h. h. h. h. h.


22. What happens if grease comes in contact with the winding of a motor?: The
h. h. h. h. h. h. h. h. h. h. h. h. h.


winding insulation my deteriorate.
h. h. h. h.


23. What is the most common type of valve used in isolating a small or medium
h. h. h. h. h. h. h. h. h. h. h. h. h. h.


sized section of a distribution system?: Gate
h. h. h. h. h. h. h.


24. What is a possible result of over greasing a bearing? There is extreme
h. h. h. h. h. h. h. h. h. h. h. h.


in the bearing chamber causing heat and scoring of the shaft.- h. h. h. h. h. h. h. h. h. h.


: Friction h.


25. What is meant by the term "peak demand?" The
h. h. momen- h. h. h. h. h. h. h.


tary load placed on a water treatment plant, pumping station or
h. h. h. h. h. h. h. h. h. h. h.


distribution system.: Maximum
h. h. h.


26. What is the range of the pH scale? between
h. h. -14.: Zero h. h. h. h. h. h. h. h.


27. What does a Bellows-type sensor reacts to a change in?
h. h. h. h. h. h. h. h. h.


.: Pressure h.


28. Centrifugal pumps do not generate suction unless the impeller is h. h. h. h. h. h. h. h. h.


sub- merged in water. If a pump is located above the level of water what
h. h. h. h. h. h. h. h. h. h. h. h. h. h. h.


must be provided on the suction piping to hold the prime?: Foot Valve
h. h. h. h. h. h. h. h. h. h. h. h. h.


29. What causes pump cavitation? A suction line may be
h. or the h. h. h. h. h. h. h. h. h.


pump is above the waterline. You have overpumped the well.: Clogged
h. h. h. h. h. h. h. h. h. h. h.


30. What does continuous leakage from a mechanical seal on a pump
h. h. h. h. h. h. h. h. h. h.


indi- cate? The mechanical seal needs to be
h. h. h. .: Replaced h. h. h. h. h. h. h.


31. What is a possible cause of a scored shaft sleeve? The
h. h. h. has h. h. h. h. h. h. h. h.


broken down: Packing
h. h. h.


32. What is one disadvantage of a centrifugal pump? It is not
h. h. .-
h. h. h. h. h. h. h. h.


: Self-Priming
h.




2 h./ h.
11

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Institution
Water Treatment Operator
Course
Water Treatment Operator

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Uploaded on
June 3, 2026
Number of pages
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Written in
2025/2026
Type
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Subjects

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