1|Page
Wastewater Treatment Operator Certification Exam
ACTUAL VERIFIED QUESTIONS AND ANSWERS
LATEST UPDATE.pdf
Detritus is noticed in your grit channel. What is the
problem?
A. Velocity too fast with short D/T
B. Velocity too low with long D/T
C. Short circuiting
D. Density currents - Answer-B. Velocity too low with long
D/T
What is considered normal operation of an aerobic
digester?
A. Fill react
B. Skim off foam when needed
C. Settle and Decant as needed
D. Feed only during low flow or constant when the sun is
out - Answer-C. Settle and Decant as needed
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A plant with a flow of 1 MGD should be monitored
A. Continuously
B. Intermittently
C. Daily
D. Every four hours depending on surface load - Answer-
A. Continuously
What do total solids consist of?
A. Dissolved and settleable
B. Floatable and settlable
C. Suspended and dissolved
D. Settlable and nonsettleable - Answer-C. Suspended
and dissolved
What would cause excessive wear on bearing?
A. Misalignment
B. Reduced Oil due to low viscosity
C. Blow seal
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D. Over tubercation - Answer-A. Misalignment
Amperometric titration is used to measure
A. Dissolved solids
B. Chlorine residual
C. Colloids
D. Emulsions - Answer-B. Chlorine residual
What growth phase is an aerobic digester operated in.
A. Log
B. Lag
C. Endogenous respiration
D. Declining phase - Answer-C. Endogenous respiration
If excessive pressure builds up in a chlorine tank due to
excessive heat. What will prevent explosions?
A. Valve seat adjustments
, 4|Page
B. Heat reducing valve
C. Fusible plug
D. Check valve - Answer-C. Fusible plug
You notice that your bearings are excessively hot on a
pump, why?
A. Ambient temperature too high
B. Over lubrication
C. Oil seal blown
D. Discharge rate too low - Answer-B. Over lubrication
Where can you gain access for collection system
maintenance?
A. Lift station
B. Force main
C. Man hole
D. Gravity main - Answer-C. Man hole
When Chlorine is combined with water what type of pipe
should be used?
Wastewater Treatment Operator Certification Exam
ACTUAL VERIFIED QUESTIONS AND ANSWERS
LATEST UPDATE.pdf
Detritus is noticed in your grit channel. What is the
problem?
A. Velocity too fast with short D/T
B. Velocity too low with long D/T
C. Short circuiting
D. Density currents - Answer-B. Velocity too low with long
D/T
What is considered normal operation of an aerobic
digester?
A. Fill react
B. Skim off foam when needed
C. Settle and Decant as needed
D. Feed only during low flow or constant when the sun is
out - Answer-C. Settle and Decant as needed
,2|Page
A plant with a flow of 1 MGD should be monitored
A. Continuously
B. Intermittently
C. Daily
D. Every four hours depending on surface load - Answer-
A. Continuously
What do total solids consist of?
A. Dissolved and settleable
B. Floatable and settlable
C. Suspended and dissolved
D. Settlable and nonsettleable - Answer-C. Suspended
and dissolved
What would cause excessive wear on bearing?
A. Misalignment
B. Reduced Oil due to low viscosity
C. Blow seal
,3|Page
D. Over tubercation - Answer-A. Misalignment
Amperometric titration is used to measure
A. Dissolved solids
B. Chlorine residual
C. Colloids
D. Emulsions - Answer-B. Chlorine residual
What growth phase is an aerobic digester operated in.
A. Log
B. Lag
C. Endogenous respiration
D. Declining phase - Answer-C. Endogenous respiration
If excessive pressure builds up in a chlorine tank due to
excessive heat. What will prevent explosions?
A. Valve seat adjustments
, 4|Page
B. Heat reducing valve
C. Fusible plug
D. Check valve - Answer-C. Fusible plug
You notice that your bearings are excessively hot on a
pump, why?
A. Ambient temperature too high
B. Over lubrication
C. Oil seal blown
D. Discharge rate too low - Answer-B. Over lubrication
Where can you gain access for collection system
maintenance?
A. Lift station
B. Force main
C. Man hole
D. Gravity main - Answer-C. Man hole
When Chlorine is combined with water what type of pipe
should be used?
