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WASTEWATER OPERATOR CLASS C EXAM PRACTICE REVIEW QUESTIONS AND ANSWERS
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WASTEWATER OPERATOR CLASS C EXAM PRACTICE REVIEW QUESTIONS AND ANSWERS
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Name: Score:100 Multiple choice questions
Term 1 of 100
What the two main gasses produced b an anaerobic digester?
Methane & Carbon Monoxide
Co2 & CH3
Methane & Co2
Hydrogen Sulfide & Oxygen
Term 2 of 100
What should be the maximum allowable level of TSS and BOD in the eff. of a domestic w/w
facility in accordance with FAC?
20 TSS, 20 BOD or 80% removal
30 TSS, 30 BOD or 90% removal
20 TSS, 30 BOD or 90% removal
20 TSS, 20 BOD or 90% removal
Term 3 of 100
What affect does Cl2, acid, and Co2 have on pH?
Raise
Neutralization
No affect
Lower
,Term 4 of 100
A colored dye solution is added into the raw wastewater entering a primary settling tank. The
dye color was noticeable in the effluent in 15 min and all of the color had passed through the
tank in 40 min. What does this indicate?
Wastewater is passing through the tank too fast for effective settling
Optimal detention time is being achieved
This tank has a detention time of 40 min.
This tank design has a detention time of 55 min.
Term 5 of 100
What is a quick test to check sludge condition?
BOD
COD
Autoclave
Settleometer
Term 6 of 100
Why is an aerobic digester covered?
Hold in gas
Protect for contaminants
Reduce radiation
Protect from cold weather
,Term 7 of 100
Which of the following would you not use a grab sample on?
BOD
DO
pH
Temp
Term 8 of 100
What does CBOD mean?
Chemical Biological Oxygen Demands
Carbonaceous Biochemical Oxygen Demand
Carbonic Biological Oxygen Demands
Chlorinated Biochemical Oxygen Demand
Term 9 of 100
If you have a sudden increase of BOD by 50% or a BOD>400. What is this termed?
Under loaded aerator
Overloaded clarifier
Increased inorganic load
Increased organic load
Term 10 of 100
Before operating any piece of equipment what should be done?
Lock out Tag out (remember, safety first!)
Read O & M manual
Read manufacturers manual
Notify supervisor
, Term 11 of 100
What are some similarities between methane and H2S?
Flammable, explosive, colorless
Flammable, explosive, odorless
Rotten egg order, yellowish color, combustible
Blue flam, non toxic, lighter than air
Term 12 of 100
In a pond, what will happen to the pH during the day time?
Decrease
Remain constant
Increase
Fluctuate
Term 13 of 100
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?
92%
94%
95%
96%
Term 14 of 100
In an anaerobic digester, when the VA/ALK ratio starts to increase, what will be noticeable?
An increase in Co2 & decrease in pH
A decrease in Co2 & increase in pH
Optimum operation
an increase in Co2 & increase in pH
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