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WATER TREATMENT GRADE 2 NEWEST 2025
ACTUAL EXAM COMPLETE 230 QUESTIONS
AND CORRECT DETAILED ANSWERS
(VERIFIED ANSWERS) |ALREADY GRADED
A+||BRAND NEW!!
what type of regeneration is preferred where raw water
constituents interfere with the peroxidation/filtration process? -
CORRECT ANSWER-intermittent
if the natural fluoride content of the raw water is variable, the
concentration of the raw water should be measured - CORRECT
ANSWER-every day
people's teeth are likely to become pitted when the fluoride
concentration in drinking water goes above which amount? -
CORRECT ANSWER-4 mg/L
how often should the fluoride concentration of treated water be
measured? - CORRECT ANSWER-every day
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where should the fluoride injection point be located? -
CORRECT ANSWER-after water has received complete
treatment
the operator must periodically check to ensure that at least
________ of chemical is maintained in the saturator at all times.
- CORRECT ANSWER-6 in. (150 mm)
when adding fluoride, when should the fluoride level be
measured to test for fluoride concentration ? - CORRECT
ANSWER-both before ad after fluoride is added
metering pumps are quite reliable, but they should receive
routine maintenance according to what authority? - CORRECT
ANSWER-the manufacturer's recommendations
if fluoride is added before filtration, a significant fluoride loss
will occur, resulting in what? - CORRECT ANSWER-low
fluoride readings
list three recordings that should be maintained to monitor the
fluoridation process. - CORRECT ANSWER-ay three of the
following: daily analyses of raw-water fluoride concentration
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(unless it is known to be stabl), daily analysis of finished water
fluoride concentration, daily records of the amount of chemical
fed ( in pounds or kg), records by the operating shift of the
chemical feed rat setting, daily computation of the theoretical
concentration
which type of sample should always be collected for
determining the presence of coliform bacteria? - CORRECT
ANSWER-grab sample
Samples to be tested for coliforms can be refrigerated for up to
__ hours before analysis, but should be done as soon as possible.
a. 4
b. 6
c. 8
d. 12 - CORRECT ANSWER-8
When a water sample is acidified, the final pH of the water must
be - CORRECT ANSWER-<2.0
which chemical is used to remove residual chlorine from water?
- CORRECT ANSWER-Na2S2O3 (Sodium thiosulfate)
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particle counters use the principle of light - CORRECT
ANSWER-blockage
distribution system samples are intended to measure the quality
of the water at - CORRECT ANSWER-various points in the
system
water that contains high concentrations of ________ can cause
the consumption of lime when using this method of softening. -
CORRECT ANSWER-free carbon dioxide
____________ is used as an oxidant for iron and manganese
control, some organic precursor control, and taste-and-odor
control. - CORRECT ANSWER-potassium permanganate
which type of sample consists of multiple grab samples taken
from the same location at different times and mixed together to
make one sample? - CORRECT ANSWER-composite sample
which type of coagulation testing is perhaps the least understood
test but the most useful process tool available to operators? -
CORRECT ANSWER-jar testing
WATER TREATMENT GRADE 2 NEWEST 2025
ACTUAL EXAM COMPLETE 230 QUESTIONS
AND CORRECT DETAILED ANSWERS
(VERIFIED ANSWERS) |ALREADY GRADED
A+||BRAND NEW!!
what type of regeneration is preferred where raw water
constituents interfere with the peroxidation/filtration process? -
CORRECT ANSWER-intermittent
if the natural fluoride content of the raw water is variable, the
concentration of the raw water should be measured - CORRECT
ANSWER-every day
people's teeth are likely to become pitted when the fluoride
concentration in drinking water goes above which amount? -
CORRECT ANSWER-4 mg/L
how often should the fluoride concentration of treated water be
measured? - CORRECT ANSWER-every day
,2|Page
where should the fluoride injection point be located? -
CORRECT ANSWER-after water has received complete
treatment
the operator must periodically check to ensure that at least
________ of chemical is maintained in the saturator at all times.
- CORRECT ANSWER-6 in. (150 mm)
when adding fluoride, when should the fluoride level be
measured to test for fluoride concentration ? - CORRECT
ANSWER-both before ad after fluoride is added
metering pumps are quite reliable, but they should receive
routine maintenance according to what authority? - CORRECT
ANSWER-the manufacturer's recommendations
if fluoride is added before filtration, a significant fluoride loss
will occur, resulting in what? - CORRECT ANSWER-low
fluoride readings
list three recordings that should be maintained to monitor the
fluoridation process. - CORRECT ANSWER-ay three of the
following: daily analyses of raw-water fluoride concentration
,3|Page
(unless it is known to be stabl), daily analysis of finished water
fluoride concentration, daily records of the amount of chemical
fed ( in pounds or kg), records by the operating shift of the
chemical feed rat setting, daily computation of the theoretical
concentration
which type of sample should always be collected for
determining the presence of coliform bacteria? - CORRECT
ANSWER-grab sample
Samples to be tested for coliforms can be refrigerated for up to
__ hours before analysis, but should be done as soon as possible.
a. 4
b. 6
c. 8
d. 12 - CORRECT ANSWER-8
When a water sample is acidified, the final pH of the water must
be - CORRECT ANSWER-<2.0
which chemical is used to remove residual chlorine from water?
- CORRECT ANSWER-Na2S2O3 (Sodium thiosulfate)
, 4|Page
particle counters use the principle of light - CORRECT
ANSWER-blockage
distribution system samples are intended to measure the quality
of the water at - CORRECT ANSWER-various points in the
system
water that contains high concentrations of ________ can cause
the consumption of lime when using this method of softening. -
CORRECT ANSWER-free carbon dioxide
____________ is used as an oxidant for iron and manganese
control, some organic precursor control, and taste-and-odor
control. - CORRECT ANSWER-potassium permanganate
which type of sample consists of multiple grab samples taken
from the same location at different times and mixed together to
make one sample? - CORRECT ANSWER-composite sample
which type of coagulation testing is perhaps the least understood
test but the most useful process tool available to operators? -
CORRECT ANSWER-jar testing
