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Waste Water Operator Class C Exam
Practice Review With Answers
Which of the following would you not use a grab sample on?
A. BOD
B. DO
C. pH
D. Temp - correct-answer -A. BOD
Staffing is based on what?
A. Budget
B. Flow and type of treatment
C. City Hall
D. Chief operator - correct-answer -B. Flow and type of treatment
What condition does an operator have the least amount of control over?
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A. Flow
B. Wasting Rate
C. F/M ratio
D. Temp - correct-answer -D. Temp
Why would you chlorinate the RAS line?
A. Remove struvite
B. Lower the pH of incoming
C. Control Filamentous bacteria
D. Meet chlorine demand - correct-answer -C. Control Filamentous bacteria
What is the most common type of pond?
A. Anaerobic
B. Aerobic
C. Facultative
D. Polishing - correct-answer -C. Facultative
The ash content in lab procedures is the same as?
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A. Organic solids
B. Volatile solids
C. Inorganic solids
D. Total solids - correct-answer -C. Inorganic solids
Denitrification will cause what?
A. Straggler floc
B. Rising sludge
C. Methane production
D. Low MLSS - correct-answer -B. Rising sludge
If a 220 volt, 3 phase motor is running backwards what should you do?
A. Switch the two leads
B. Return pump for a refund
C. Check the polarity magnets
D. Check static pressure - correct-answer -A. Switch the two leads
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Coliform count fails to meet standards your chlorine supply is not the problem.
What is?
A. Short circuiting and low contact time
B. Chlorine has become stale
C. High temps
D. Lack of disinfectant bacteria - correct-answer -A. Short circuiting and low
contact time
What type of material should be used for transporting samples?
A. Glass
B. Polyethylene
C. Graduated cylinders
D. Burette - correct-answer -B. Polethylene
How does temperature effect disinfection?
A. Lower the temp the better the disinfection
B. Has no effect
C. Higher the temp the better the disinfection
Waste Water Operator Class C Exam
Practice Review With Answers
Which of the following would you not use a grab sample on?
A. BOD
B. DO
C. pH
D. Temp - correct-answer -A. BOD
Staffing is based on what?
A. Budget
B. Flow and type of treatment
C. City Hall
D. Chief operator - correct-answer -B. Flow and type of treatment
What condition does an operator have the least amount of control over?
,2|Page
A. Flow
B. Wasting Rate
C. F/M ratio
D. Temp - correct-answer -D. Temp
Why would you chlorinate the RAS line?
A. Remove struvite
B. Lower the pH of incoming
C. Control Filamentous bacteria
D. Meet chlorine demand - correct-answer -C. Control Filamentous bacteria
What is the most common type of pond?
A. Anaerobic
B. Aerobic
C. Facultative
D. Polishing - correct-answer -C. Facultative
The ash content in lab procedures is the same as?
,3|Page
A. Organic solids
B. Volatile solids
C. Inorganic solids
D. Total solids - correct-answer -C. Inorganic solids
Denitrification will cause what?
A. Straggler floc
B. Rising sludge
C. Methane production
D. Low MLSS - correct-answer -B. Rising sludge
If a 220 volt, 3 phase motor is running backwards what should you do?
A. Switch the two leads
B. Return pump for a refund
C. Check the polarity magnets
D. Check static pressure - correct-answer -A. Switch the two leads
, 4|Page
Coliform count fails to meet standards your chlorine supply is not the problem.
What is?
A. Short circuiting and low contact time
B. Chlorine has become stale
C. High temps
D. Lack of disinfectant bacteria - correct-answer -A. Short circuiting and low
contact time
What type of material should be used for transporting samples?
A. Glass
B. Polyethylene
C. Graduated cylinders
D. Burette - correct-answer -B. Polethylene
How does temperature effect disinfection?
A. Lower the temp the better the disinfection
B. Has no effect
C. Higher the temp the better the disinfection
