WASTEWATER CLASS C EXAM QUESTIONS WITH THE
LATEST AND UPDATED SCORES.
1) Industrial waste materials which are usually not compatible with municipal
_ _ _ _ _ _ _ _ _ _
treatment plants include: _ _
A. chemical oxygen demand _ _
B. Heavy metals. _
C. petroleum fats , oils and greases _ _ _ _ _
D. nitrogen and phosphorus compounds. _ _ _
E. B and C -- Correct Answer ✔✔ B. Heavy metals.
_ _ _ _ _ _ _ _ _
2) Sludge is observed to accumulate in the final clarifier. This may be caused by :
_ _ _ _ _ _ _ _ _ _ _ _ _ _
A. plugged sludge collectors return pumps or waste pumps _ _ _ _ _ _ _
B. too high a return rate. _ _ _ _
C. excessive solids wasting. _ _
D. hydraulically overloaded clarifier _ _
E. All of the above. -- Correct Answer ✔✔ A. plugged sludge collectors
_ _ _ _ _ _ _ _ _ _ _ _
return pumps or waste pumps _ _ _ _
3) What is the relationship between the F/M ratio and the MCRT sludge age for a
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _
particular plant when the aerator detention time is a constant value.
_ _ _ _ _ _ _ _ _ _
A. these to control parameters are unrelated.
_ _ _ _ _
B. When one increases the other increases. _ _ _ _ _
C. When one increases the other decreases. _ _ _ _ _
D. it is a direct relationship
_ _ _ _
E. The F/M ratio is one tenth of the MCRT (Sludge Age) -- Correct Answer
_ _ _ _ _ _ _ _ _ _ _ _ _ _
✔✔ C. When one increases the other decreases.
_ _ _ _ _ _ _
, 4) Using results only from the settle-ability test and MLSS test of activated sludge
_ _ _ _ _ _ _ _ _ _ _ _ _
solids the operator will be able to
_ _ _ _ _ _ _
A. calculate the F/M ratio _ _ _
B. Set the doge for chlorinating the return activated sludge
_ _ _ _ _ _ _ _
C. Calculate the MCRT _ _
D. Calculate the SVI _ _
E. A and C -- Correct Answer ✔✔ D. Calculate the SVI
_ _ _ _ _ _ _ _ _ _
5) Which of the following F/M ratios would be in the proper rage for a contact
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _
stabilization activated sludge plant? _ _ _
A. 0.08
B. 0.12
C. 0.30
D. 0.75
E. 1.25 -- Correct Answer ✔✔ C. 0.30
_ _ _ _ _ _
6) Short circuiting in a final sedimentation process:
_ _ _ _ _ _
A. is probably caused by mechanical failures.
_ _ _ _ _
B. usually represents a hydraulic deficiency of design or operation
_ _ _ _ _ _ _ _
C. Increases efficiency by facilitating rapid movement of treatment plant
_ _ _ _ _ _ _ _ _
effluent
D. has no effect on plant performance.
_ _ _ _ _
E. All of the above. -- Correct Answer ✔✔ B. usually represents a hydraulic
_ _ _ _ _ _ _ _ _ _ _ _ _
deficiency of design or operation _ _ _ _
7) An old, over oxidized sludge at an underloaded plant produces mixed liquor solids
_ _ _ _ _ _ _ _ _ _ _ _
that
_ _
A. settle slowly but produce a clear effluent
_ _ _ _ _ _
B. Settle rapidly leaving a turbid supernatant.
_ _ _ _ _
C. Cannot nitrify but turn septic readily in the final clarifier
_ _ _ _ _ _ _ _ _
D. All the above
_ _
LATEST AND UPDATED SCORES.
1) Industrial waste materials which are usually not compatible with municipal
_ _ _ _ _ _ _ _ _ _
treatment plants include: _ _
A. chemical oxygen demand _ _
B. Heavy metals. _
C. petroleum fats , oils and greases _ _ _ _ _
D. nitrogen and phosphorus compounds. _ _ _
E. B and C -- Correct Answer ✔✔ B. Heavy metals.
_ _ _ _ _ _ _ _ _
2) Sludge is observed to accumulate in the final clarifier. This may be caused by :
_ _ _ _ _ _ _ _ _ _ _ _ _ _
A. plugged sludge collectors return pumps or waste pumps _ _ _ _ _ _ _
B. too high a return rate. _ _ _ _
C. excessive solids wasting. _ _
D. hydraulically overloaded clarifier _ _
E. All of the above. -- Correct Answer ✔✔ A. plugged sludge collectors
_ _ _ _ _ _ _ _ _ _ _ _
return pumps or waste pumps _ _ _ _
3) What is the relationship between the F/M ratio and the MCRT sludge age for a
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _
particular plant when the aerator detention time is a constant value.
_ _ _ _ _ _ _ _ _ _
A. these to control parameters are unrelated.
_ _ _ _ _
B. When one increases the other increases. _ _ _ _ _
C. When one increases the other decreases. _ _ _ _ _
D. it is a direct relationship
_ _ _ _
E. The F/M ratio is one tenth of the MCRT (Sludge Age) -- Correct Answer
_ _ _ _ _ _ _ _ _ _ _ _ _ _
✔✔ C. When one increases the other decreases.
_ _ _ _ _ _ _
, 4) Using results only from the settle-ability test and MLSS test of activated sludge
_ _ _ _ _ _ _ _ _ _ _ _ _
solids the operator will be able to
_ _ _ _ _ _ _
A. calculate the F/M ratio _ _ _
B. Set the doge for chlorinating the return activated sludge
_ _ _ _ _ _ _ _
C. Calculate the MCRT _ _
D. Calculate the SVI _ _
E. A and C -- Correct Answer ✔✔ D. Calculate the SVI
_ _ _ _ _ _ _ _ _ _
5) Which of the following F/M ratios would be in the proper rage for a contact
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _
stabilization activated sludge plant? _ _ _
A. 0.08
B. 0.12
C. 0.30
D. 0.75
E. 1.25 -- Correct Answer ✔✔ C. 0.30
_ _ _ _ _ _
6) Short circuiting in a final sedimentation process:
_ _ _ _ _ _
A. is probably caused by mechanical failures.
_ _ _ _ _
B. usually represents a hydraulic deficiency of design or operation
_ _ _ _ _ _ _ _
C. Increases efficiency by facilitating rapid movement of treatment plant
_ _ _ _ _ _ _ _ _
effluent
D. has no effect on plant performance.
_ _ _ _ _
E. All of the above. -- Correct Answer ✔✔ B. usually represents a hydraulic
_ _ _ _ _ _ _ _ _ _ _ _ _
deficiency of design or operation _ _ _ _
7) An old, over oxidized sludge at an underloaded plant produces mixed liquor solids
_ _ _ _ _ _ _ _ _ _ _ _
that
_ _
A. settle slowly but produce a clear effluent
_ _ _ _ _ _
B. Settle rapidly leaving a turbid supernatant.
_ _ _ _ _
C. Cannot nitrify but turn septic readily in the final clarifier
_ _ _ _ _ _ _ _ _
D. All the above
_ _
