AWWA Water Operator Certification Exam Prep UPDATED ACTUAL Questions and CORRECT Answers
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Course
AWWA Water Operator Certification
Institution
AWWA Water Operator Certification
AWWA Water Operator Certification Exam
Prep UPDATED ACTUAL Questions and
CORRECT Answers
What is the most common disinfection by product when adding chlorine to water containing
natural and inorganic matter? - CORRECT ANSWER- Chloroform
What will most probably cause taste and odors, slime, ...
AWWA Water Operator Certification Exam
Prep UPDATED ACTUAL Questions and
CORRECT Answers
What is the most common disinfection by product when adding chlorine to water containing
natural and inorganic matter? - CORRECT ANSWER✔✔- Chloroform
What will most probably cause taste and odors, slime, and filter clogging? - CORRECT
ANSWER✔✔- Blue-green Algae
Why can rapid sand filters handle higher filtration rates compared to slow sand filters? -
CORRECT ANSWER✔✔- Coarser sand
Iron bacteria can interfere with ___________ because the bacteria produce
_____________that prevents the stabilization chemicals from reaching the pipe surface. -
CORRECT ANSWER✔✔- stabilization, a slime layer
Hypochlorous acid is favored over hypochlorite ion when the pH is _____________and the
temperature is ___________. - CORRECT ANSWER✔✔- low, low
What filter has an unstratified media distribution? - CORRECT ANSWER✔✔- slow sand
filters
What is (are) the combine chlorine residual(s) at pH values ranging from 6.5 to 8.5? -
CORRECT ANSWER✔✔- Monochloramine and dichloramine
When iron alone is treated using manganese greensand filters, the chlorine feed rate should
be about _________________. - CORRECT ANSWER✔✔- 1.0 to 1.2 times the iron
concentration
chlorination of water that has high concentrations of natural organic matter will produce -
CORRECT ANSWER✔✔- THMs
,When disinfecting with chloramines, when can the ammonia be added to the process? -
CORRECT ANSWER✔✔- Before, same time as, or after the chlorine
What will settle out of the water in a short period of time? - CORRECT ANSWER✔✔- Very
fine silt
Point-of-use activated carbon filters are most effective for removing _________________. -
CORRECT ANSWER✔✔- Chlorine
Potassium permanganate is used as an oxidant for control of ____________________. -
CORRECT ANSWER✔✔- Iron and manganese, organic precursors, and taste and odors
What must an operator periodically check regarding the cyclone separator system? -
CORRECT 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. - CORRECT ANSWER✔✔- Sequestering agents
An operator should record filter ______________ measurements, condition, and depth of
media on a ________ basis. - CORRECT 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? - CORRECT ANSWER✔✔-
CaSO4 and CaCl2
What are absolute ratings based on with regard to membranes? - CORRECT ANSWER✔✔-
Largest pore opening
How ar manganese greensand beds regenerated? - CORRECT ANSWER✔✔- Backwashed
with permanganate solution
The most effective process for removing radon gas, when considering cost and footprint,
would be ____________. - CORRECT ANSWER✔✔- packed tower aeration
,What is the primary advantage of placing a properly sized anthracite coal layer over
manganese greensand? - CORRECT ANSWER✔✔- Longer filter run times
What factor will cause problems for chlorination? - CORRECT 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. - CORRECT ANSWER✔✔- calcium hydroxide, lime
What does the optimal pH establish when applied to iron and manganese oxidation? -
CORRECT 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? - CORRECT ANSWER✔✔- Taste and odor will develop,
Bacterial growth will be supported, and Nitrification
The reduction of color would most likely occur after - CORRECT ANSWER✔✔-
coagulation, flocculation, and sedimentation
To eliminate hydrogen sulfide (H2S), the pH of the water should be lowered to
____________ or less before beginning aeration. - CORRECT ANSWER✔✔- 6.0
Permanganate reactions are largely dependent on ___________. - CORRECT ANSWER✔✔-
pH
What are the primary reasons that more small water stems are installing pressure filters? -
CORRECT 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. - CORRECT ANSWER✔✔- high pH, low
solubility, preciptate
, It is recommended that the free chlorine residual at a customer's tap should be at least
________. - CORRECT ANSWER✔✔- 0.2 mg/L
Microfiltration is considered to be intermediate between ___________ based on pore size. -
CORRECT ANSWER✔✔- ultrafiltration and multimedia granular filtration
After microscreening, there should be a significant reduction in ______________. -
CORRECT ANSWER✔✔- Turbidity
How can the problem of poorly formed floc be solved? - CORRECT 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? - CORRECT 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. - CORRECT
ANSWER✔✔- alkalinity, 0.5 mg/L
A cloudy appearance in the last flocculation chamber is usually caused by ____________. -
CORRECT ANSWER✔✔- inadequate coagulant dosage
What type of meter is most commonly use for customer metering? - CORRECT
ANSWER✔✔- Positive-displacement meters
In general, the size of floc that has been found to be optimal for settling efficiency is
____________________. - CORRECT ANSWER✔✔- pinhead-size floc
In a pulsator clarifier, what is the purpose of the pulses and how often are pulses generated? -
CORRECT ANSWER✔✔- To maintain a uniform sludge layer; 40-50 sec
UV application will - CORRECT ANSWER✔✔- inhibit bacterial growth and replication
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