WasteWater Operator class C exam practice review
Study online at https://quizlet.com/_hrxotc
1. When Chlorine is combined with water what type of pipe should be used?
A. Ductile iron
B. Asbestos concrete
C. PVC
D. Carbon Steel: C. PVC
2. 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: D. Free swimmers and stalk ciliates
3. What is Phenolphylein used for in titration
A. Oxidizer
B. Indicator
C. Acid reducer to lower pH
D. Applicator: B. Indicator
4. 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%: C. 95%
5. 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: C. VA/ALK ratio
, WasteWater Operator class C exam practice review
Study online at https://quizlet.com/_hrxotc
6. 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: C. Read manufacturers manual
7. 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: B. Velocity too low with long D/T
8. 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: C. Settle and Decant as
needed
9. 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: A. Continuously
10. What do total solids consist of?
A. Dissolved and settleable
B. Floatable and settlable
C. Suspended and dissolved
D. Settlable and nonsettleable: C. Suspended and dissolved
11. What would cause excessive wear on bearing?
, WasteWater Operator class C exam practice review
Study online at https://quizlet.com/_hrxotc
A. Misalignment
B. Reduced Oil due to low viscosity
C. Blow seal
D. Over tubercation: A. Misalignment
12. Amperometric titration is used to measure
A. Dissolved solids
B. Chlorine residual
C. Colloids
D. Emulsions: B. Chlorine residual
13. What growth phase is an aerobic digester operated in.
A. Log
B. Lag
C. Endogenous respiration
D. Declining phase: C. Endogenous respiration
14. If excessive pressure builds up in a chlorine tank due to excessive heat. What
will prevent explosions?
A. Valve seat adjustments
B. Heat reducing valve
C. Fusible plug
D. Check valve: C. Fusible plug
15. 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: B. Over lubrication
16. Where can you gain access for collection system maintenance?
A. Lift station
B. Force main
Study online at https://quizlet.com/_hrxotc
1. When Chlorine is combined with water what type of pipe should be used?
A. Ductile iron
B. Asbestos concrete
C. PVC
D. Carbon Steel: C. PVC
2. 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: D. Free swimmers and stalk ciliates
3. What is Phenolphylein used for in titration
A. Oxidizer
B. Indicator
C. Acid reducer to lower pH
D. Applicator: B. Indicator
4. 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%: C. 95%
5. 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: C. VA/ALK ratio
, WasteWater Operator class C exam practice review
Study online at https://quizlet.com/_hrxotc
6. 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: C. Read manufacturers manual
7. 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: B. Velocity too low with long D/T
8. 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: C. Settle and Decant as
needed
9. 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: A. Continuously
10. What do total solids consist of?
A. Dissolved and settleable
B. Floatable and settlable
C. Suspended and dissolved
D. Settlable and nonsettleable: C. Suspended and dissolved
11. What would cause excessive wear on bearing?
, WasteWater Operator class C exam practice review
Study online at https://quizlet.com/_hrxotc
A. Misalignment
B. Reduced Oil due to low viscosity
C. Blow seal
D. Over tubercation: A. Misalignment
12. Amperometric titration is used to measure
A. Dissolved solids
B. Chlorine residual
C. Colloids
D. Emulsions: B. Chlorine residual
13. What growth phase is an aerobic digester operated in.
A. Log
B. Lag
C. Endogenous respiration
D. Declining phase: C. Endogenous respiration
14. If excessive pressure builds up in a chlorine tank due to excessive heat. What
will prevent explosions?
A. Valve seat adjustments
B. Heat reducing valve
C. Fusible plug
D. Check valve: C. Fusible plug
15. 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: B. Over lubrication
16. Where can you gain access for collection system maintenance?
A. Lift station
B. Force main
