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AWWA Water Operator Certification Exam Prep Questions and Answers
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AWWA Water Operator Certification Exam Prep Questions and Answers What is the most common disinfection by product when adding chlorine to water containing natural and inorganic matter? - ANSWER-Chloroform What will most probably cause taste and odors, slime, and filter clogging? - ANSWER-Blue-g...

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  • November 10, 2024
  • 51
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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AWWA Water Operator Certification Exam

Prep Questions and Answers




What is the most common disinfection by product when adding chlorine to water containing natural and

inorganic matter? - ANSWER✔✔-Chloroform


What will most probably cause taste and odors, slime, and filter clogging? - ANSWER✔✔-Blue-green

Algae


Why can rapid sand filters handle higher filtration rates compared to slow sand filters? - ANSWER✔✔-

Coarser sand


Iron bacteria can interfere with ___________ because the bacteria produce _____________that

prevents the stabilization chemicals from reaching the pipe surface. - ANSWER✔✔-stabilization, a slime

layer


Hypochlorous acid is favored over hypochlorite ion when the pH is _____________and the temperature

is ___________. - ANSWER✔✔-low, low


What filter has an unstratified media distribution? - ANSWER✔✔-slow sand filters


What is (are) the combine chlorine residual(s) at pH values ranging from 6.5 to 8.5? - ANSWER✔✔-

Monochloramine and dichloramine




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When iron alone is treated using manganese greensand filters, the chlorine feed rate should be about

_________________. - ANSWER✔✔-1.0 to 1.2 times the iron concentration


chlorination of water that has high concentrations of natural organic matter will produce - ANSWER✔✔-

THMs


When disinfecting with chloramines, when can the ammonia be added to the process? - ANSWER✔✔-

Before, same time as, or after the chlorine


What will settle out of the water in a short period of time? - ANSWER✔✔-Very fine silt


Point-of-use activated carbon filters are most effective for removing _________________. -

ANSWER✔✔-Chlorine


Potassium permanganate is used as an oxidant for control of ____________________. - ANSWER✔✔-

Iron and manganese, organic precursors, and taste and odors


What must an operator periodically check regarding the cyclone separator system? - ANSWER✔✔-

Storage bin or hopper to empty of sand and grit


These types of chemicals chemically tie up scale-forming ions and are eventually ingested by consumers.

- ANSWER✔✔-Sequestering agents


An operator should record filter ______________ measurements, condition, and depth of media on a

________ basis. - ANSWER✔✔-bed expansion, quarterly


Lime will precipitate noncarbonate hardness from the water, but it also orms noncarbonate salts that

cause noncarbonate hardness. What are these salts? - ANSWER✔✔-CaSO4 and CaCl2


What are absolute ratings based on with regard to membranes? - ANSWER✔✔-Largest pore opening


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How ar manganese greensand beds regenerated? - ANSWER✔✔-Backwashed with permanganate

solution


The most effective process for removing radon gas, when considering cost and footprint, would be

____________. - ANSWER✔✔-packed tower aeration


What is the primary advantage of placing a properly sized anthracite coal layer over manganese

greensand? - ANSWER✔✔-Longer filter run times


What factor will cause problems for chlorination? - ANSWER✔✔-Foreign substances


In the lime-soda ash softening process, smaller plants find that ________ is less expensive to purchase;

regardless of the size of the plant, ___________ needs to be mixed long enough because it dissolves

rather slowly. - ANSWER✔✔-calcium hydroxide, lime


What does the optimal pH establish when applied to iron and manganese oxidation? - ANSWER✔✔-

Detention time


A water plant using chloramines as a disinfectant has allowed sizable amounts of turbidity to enter the

distribution system. If this occurs over a period of years, what will occur at the far end of the distribution

system? - ANSWER✔✔-Taste and odor will develop, Bacterial growth will be supported, and Nitrification


The reduction of color would most likely occur after - ANSWER✔✔-coagulation, flocculation, and

sedimentation


To eliminate hydrogen sulfide (H2S), the pH of the water should be lowered to ____________ or less

before beginning aeration. - ANSWER✔✔-6.0


Permanganate reactions are largely dependent on ___________. - ANSWER✔✔-pH



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What are the primary reasons that more small water stems are installing pressure filters? - ANSWER✔✔-

Because installation and operating costs are low


Because lime slurries have a _________ and a ___________ in water, calcium carbonate will

____________ on anything the slurry touches. - ANSWER✔✔-high pH, low solubility, preciptate


It is recommended that the free chlorine residual at a customer's tap should be at least ________. -

ANSWER✔✔-0.2 mg/L


Microfiltration is considered to be intermediate between ___________ based on pore size. -

ANSWER✔✔-ultrafiltration and multimedia granular filtration


After microscreening, there should be a significant reduction in ______________. - ANSWER✔✔-

Turbidity


How can the problem of poorly formed floc be solved? - ANSWER✔✔-Use of coagulant aid


What chemical used in corrosion control gives off large quantities of CO2 when it comes in contact with

an acid? - ANSWER✔✔-Soda ash


Alum requires _____________ to be present naturally or added fro proper coagulation, and about

_____________ is required for each milligram of alum added per liter. - ANSWER✔✔-alkalinity, 0.5 mg/L


A cloudy appearance in the last flocculation chamber is usually caused by ____________. - ANSWER✔✔-

inadequate coagulant dosage


What type of meter is most commonly use for customer metering? - ANSWER✔✔-Positive-displacement

meters




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