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Waste Water Operator Lv 1 Exam Prep TEST FINAL EXAM AND
PRACTICE EXAM 20262027 BANK 2 VERSIONS QUESTIONS
WITH DETAILED VERIFIED ANSWERS EXAM QUESTIONS
WILL COME FROM HERE (100% CORRECT ANSWERS A+
GRADED
In the activated sludge process, some of the activated sludge must be
wasted to...
A. Prevent excessive solid buildup
B. Prevent clogging of the sludge return line
C. Prevent overloading of sludge return pumps
D. Increase digester gas production - ANSWERS--A. Prevent excessive
solid buildup
The best operating strategy for feeding primary sludge to an anaerobic
digester is to feed...
A. Several time a day
B. Large quantities once or twice a day
C. Once a day
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D. When the volatile solids drop below 60% - ANSWERS--A. Several time
a day
Why is scum skimmed from the liquid surface of a primary settling
tank?
A. To reduce load on the digester
B. To eliminate interference with sludge removal
C. To allow aeration of the tank contents
D. To reduce odor and insect nuisance - ANSWERS--B. To eliminate
interference with sludge removal
Which of the following test would give the fastest indication of toxicity
in an activated sludge process?
A. Oxygen Uptake Rate (OUR)
B. Settleometer
C. MLSS
D. Microscopic Observation - ANSWERS--A. Oxygen Uptake Rate (OUR)
Filamentous bulking of activated sludge may be controlled temporarily
by...
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A. Adding sodium chloride to the aeration tank
B. Spraying water on the aeration tank surface
C. Carefully chlorinating the return sludge and mixed liquor
D. Aerating the final settling tank - ANSWERS--C. Carefully chlorinating
the return sludge and mixed liquor
Since reaction rates are lower during the winter, the operator of an
activated sludge plant will usually...
A. Increase dissolved oxygen levels
B. Decrease MCRT
C. Decrease wasting
D. Increase MCRT - ANSWERS--D. Increase MCRT
In a healthy activated sludge process which of the following organisms
will most likely be found in the greatest numbers?
A. Stalked Ciliates
B. Amoebas
C. Free swimming ciliates
D. Nymphs - ANSWERS--A. Stalked Ciliates
Alkalinity is a measure of the ability of wastewater to...
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A. Neutralize base
B. Neutralize acid
C. Dissolve organics
D. Maintain constant temperature - ANSWERS--B. Neutralize acid
What is one advantage of a COD test over a BOD test?
A. Shorter test time
B. More accurate
C. Safer
D. Less chemicals needed - ANSWERS--A. Shorter test time
Fecal coliform results are reported as MPN per...
A. 10 mL
B. 50 mL
C. 100 mL
D. 1,000 mL - ANSWERS--C. 100 mL
A BOD can be removed from the incubator at 5 days plus of minus...
Waste Water Operator Lv 1 Exam Prep TEST FINAL EXAM AND
PRACTICE EXAM 20262027 BANK 2 VERSIONS QUESTIONS
WITH DETAILED VERIFIED ANSWERS EXAM QUESTIONS
WILL COME FROM HERE (100% CORRECT ANSWERS A+
GRADED
In the activated sludge process, some of the activated sludge must be
wasted to...
A. Prevent excessive solid buildup
B. Prevent clogging of the sludge return line
C. Prevent overloading of sludge return pumps
D. Increase digester gas production - ANSWERS--A. Prevent excessive
solid buildup
The best operating strategy for feeding primary sludge to an anaerobic
digester is to feed...
A. Several time a day
B. Large quantities once or twice a day
C. Once a day
,2|Page
D. When the volatile solids drop below 60% - ANSWERS--A. Several time
a day
Why is scum skimmed from the liquid surface of a primary settling
tank?
A. To reduce load on the digester
B. To eliminate interference with sludge removal
C. To allow aeration of the tank contents
D. To reduce odor and insect nuisance - ANSWERS--B. To eliminate
interference with sludge removal
Which of the following test would give the fastest indication of toxicity
in an activated sludge process?
A. Oxygen Uptake Rate (OUR)
B. Settleometer
C. MLSS
D. Microscopic Observation - ANSWERS--A. Oxygen Uptake Rate (OUR)
Filamentous bulking of activated sludge may be controlled temporarily
by...
,3|Page
A. Adding sodium chloride to the aeration tank
B. Spraying water on the aeration tank surface
C. Carefully chlorinating the return sludge and mixed liquor
D. Aerating the final settling tank - ANSWERS--C. Carefully chlorinating
the return sludge and mixed liquor
Since reaction rates are lower during the winter, the operator of an
activated sludge plant will usually...
A. Increase dissolved oxygen levels
B. Decrease MCRT
C. Decrease wasting
D. Increase MCRT - ANSWERS--D. Increase MCRT
In a healthy activated sludge process which of the following organisms
will most likely be found in the greatest numbers?
A. Stalked Ciliates
B. Amoebas
C. Free swimming ciliates
D. Nymphs - ANSWERS--A. Stalked Ciliates
Alkalinity is a measure of the ability of wastewater to...
, 4|Page
A. Neutralize base
B. Neutralize acid
C. Dissolve organics
D. Maintain constant temperature - ANSWERS--B. Neutralize acid
What is one advantage of a COD test over a BOD test?
A. Shorter test time
B. More accurate
C. Safer
D. Less chemicals needed - ANSWERS--A. Shorter test time
Fecal coliform results are reported as MPN per...
A. 10 mL
B. 50 mL
C. 100 mL
D. 1,000 mL - ANSWERS--C. 100 mL
A BOD can be removed from the incubator at 5 days plus of minus...
