WASTEWATER OPERATOR CLASS
C EXAM COMPREHENSIVE TEST
BANK EXPERT REVIEWED
QUESTIONS ANSWERS
◉ A good settling sludge would consist of what type of protozoa?
A. Rotifers and nematodes
B. Amoebas and Flagellates
C. Stalked ciliates and mastagoria
D. Free swimmers and stalk ciliates. Answer: D. Free swimmers and
stalk ciliates
◉ What is Phenolphylein used for in titration
A. Oxidizer
B. Indicator
C. Acid reducer to lower pH
D. Applicator. Answer: B. Indicator
◉ Your plant has an influent of 220 BOD and 163 TSS, and an
effluent of 10 BOD, and 6 TSS. What is the BOD removal efficiency in
your plant?
,A. 92%
B. 94%
C. 95%
D. 96%. Answer: C. 95%
◉ You suspect your anaerobic digester is going sour. What is the best
way to verify its condition?
A. pH
B. Foam type
C. VA/ALK ratio
D. DO. Answer: C. VA/ALK ratio
◉ Before operating any piece of equipment what should be done?
A. Lock out Tag out (remember, safety first!)
B. Read O & M manual
C. Read manufacturers manual
D. Notify supervisor. Answer: C. Read manufacturers manual
◉ 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
◉ 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
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.
C EXAM COMPREHENSIVE TEST
BANK EXPERT REVIEWED
QUESTIONS ANSWERS
◉ A good settling sludge would consist of what type of protozoa?
A. Rotifers and nematodes
B. Amoebas and Flagellates
C. Stalked ciliates and mastagoria
D. Free swimmers and stalk ciliates. Answer: D. Free swimmers and
stalk ciliates
◉ What is Phenolphylein used for in titration
A. Oxidizer
B. Indicator
C. Acid reducer to lower pH
D. Applicator. Answer: B. Indicator
◉ Your plant has an influent of 220 BOD and 163 TSS, and an
effluent of 10 BOD, and 6 TSS. What is the BOD removal efficiency in
your plant?
,A. 92%
B. 94%
C. 95%
D. 96%. Answer: C. 95%
◉ You suspect your anaerobic digester is going sour. What is the best
way to verify its condition?
A. pH
B. Foam type
C. VA/ALK ratio
D. DO. Answer: C. VA/ALK ratio
◉ Before operating any piece of equipment what should be done?
A. Lock out Tag out (remember, safety first!)
B. Read O & M manual
C. Read manufacturers manual
D. Notify supervisor. Answer: C. Read manufacturers manual
◉ 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
◉ 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
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.
