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Water Treatment Plant Operator Exam Questions and Answers 100% Pass
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Water Treatment Plant Operator Exam Questions and Answers 100% Pass Alum - What is used as a chemical coagulant? Coagulation, Flocculation, Sedimentation and Filtration - The correct order of treatment in a surface water plant is... Jar - In determining the proper dosage of alum, the most usef...

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  • December 23, 2024
  • 17
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • water treatment plant operator exam questions and

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  • Water Treatment Plant Operator
  • Water Treatment Plant Operator

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Water Treatment Plant Operator Exam Questions
and Answers 100% Pass


Alum - ✔✔What is used as a chemical coagulant?


Coagulation, Flocculation, Sedimentation and Filtration - ✔✔The correct order of treatment in a surface

water plant is...


Jar - ✔✔In determining the proper dosage of alum, the most useful test is the____________ test.


Turbidity - ✔✔If sludge is not continually removed from the sedimentation basin, its accumulation

results in?


Aluminum sulfate - ✔✔The most widely used coagulant is....


Gentle Agitation - ✔✔Optimum flocculation requires:


Turbidity - ✔✔Dissolved iron in excessive amounts results in consumer complaints about:


Turbidity - ✔✔The most important raw water constituent for a surface water plant is....


Suspended materials - ✔✔Turbidity in water is cause by the presence of.....


Coagulant dosage - ✔✔The main purpose of the jar test is to determine the best:


Decreasing the rate of chlorine withdrawal - ✔✔The formation of chlorine ice affects chlorine feed rate.

This can be prevented by:


157F-162F - ✔✔The fusible metal plug on a chlorine cylinder is designed to open at what temperature

range?




Created by Katelyn Whitman © 2025, All Rights Reserved. 100% PASS GUARANTEE

,2|Page


spacer ring in a pump packing gland - ✔✔A lantern ring is a....


Sand boils - ✔✔When backwashing a filter, the backwash valve should be opened slowly to prevent....


down to the hydraulic grade line - ✔✔Suction lift refers to the pressure difference between the center line

of the pump....


Trihalomethanes - ✔✔Prechlorination of raw water can lead to an interaction of chlorine with organic

matter which can form?


To remove turbidity - ✔✔What is the main purpose of the coagulation and flocculation process?


Velocity, water temperature, detention time and coagulant dosage - ✔✔What conditions most affect

coagulation performance?


Filter effluent turbidity - ✔✔What would be the best indicator that the filter should be backwashed?


proper backwashing - ✔✔The most crucial element of effective filter performance is...


Ca(OCI)2 - ✔✔What is the chemical formula for calcium hypochlorite?


The running average of quarterly samples during the previous 12 months exceeds the MCL. - ✔✔A

violation of the MCL for total trihalomethanes occurs when?


pH of 10, optimum range is pH of 5 - ✔✔What would the pH of water be that had the highest

concentration of hypochlorous acid?


Sodium chloride solution or NaCL - ✔✔What is the solution used to regenerate a zeolite softening unit?


Corrosiveness - ✔✔Langelier's index is used to determine


Caustic Soda AKA Sodium Hydroxide - ✔✔An effective chemical to raise pH is....


Calcium Carbonate and Magnesium Bicarbonate - ✔✔Minerals that cause an increase in alkalinity are?




Created by Katelyn Whitman © 2025, All Rights Reserved. 100% PASS GUARANTEE

, 3|Page


Increase in sodium content - ✔✔A problem related to ion exchange softeners is?


Phosphorous - ✔✔In a reservoir, the main water constituent that encourages algae growth is?


Air pressure - ✔✔A bubbler measures water level by sensing


Bacteria - ✔✔The primary contaminant that is important to public health is?


Influent turbidity - ✔✔What cannot be controlled in the normal operation of a sand filter?


Cavitation - ✔✔A partial blockage on the intake line of a centrifugal pump may cause...


change the alum dosage - ✔✔Continuous recording of the influent water turbidity is useful in indicating

when to...


Sodium fluoride - ✔✔What water treatment chemical is chemical feeder adjustment most critical because

of potential toxicity?


Filter aid chemicals - ✔✔A chemical feed line that is installed after the sedimentation tank and before the

filter is used to inject what chemical?


potassium permanganate - ✔✔A dry chemical feeder is suitable for adding....


Lower pH - ✔✔Carbon dioxide is used in water treatment to do what?


a buffer solution with pH approaching that of the sample - ✔✔pH meters should be standardized

against....


sodium ions - ✔✔A Zeolite softening unit will replace calcium and magnesium ions with...


fluosilicic acid - ✔✔A liquid form of fluoride that is most widely used in water treatment is....


Alkalinity - ✔✔When alum is added to water, a floc is formed from the combination of alum and....


surface settling rate - ✔✔Successful performance of a sedimentation basin depends greatly upon...



Created by Katelyn Whitman © 2025, All Rights Reserved. 100% PASS GUARANTEE

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