Exam (elaborations)
CA GRADE 2 WASTEWATER TREATMENT OPERATOR PRACTICE EXAM 1 QUESTIONS AND ANSWERS
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CA GRADE 2 WASTEWATER TREATMENT OPERATOR PRACTICE EXAM 1 QUESTIONS AND ANSWERS
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Name: Score:80 Multiple choice questions
Term 1 of 80
How much dissolved oxygen should be in a conventional activated sludge system if good
effluent is being produced?
102 to 4 mg/l
0.5 to 1 mg/l
2 to 4 mg/l
2 to 96 mg/l
Term 2 of 80
What might cause thick billows of white sudsy foam in the aeration tank?
MLSS is too low
Mlss is too high
Gasification from aging sludge
Temperature in the aeration tank is too low
Term 3 of 80
What is the differnce between the sludge from a primary clarifier and a secondary clarifier?
dissolved oxygen, temperature, and pH
primary sludge is denser than secondary
test for the biochemical oxygen demand
The BOD bottle should be completely filled to the top
,Term 4 of 80
What is the equivalent of 1 mg/l?
0.5 ppm
10 ppm
5 ppm
1 ppm
Term 5 of 80
What should you do if you are mildly exposed to chlorine gas?
immediately evacuate the contaminated area, remian calm, keep warm. breath lightly,
avoid coughing
stay in the area and try to identify the source of the chlorine gas
drink plenty of water to dilute the chlorine gas in your system
cover your mouth with a cloth and continue working as normal
Term 6 of 80
What is the health effect of carbon dioxide?
to prevent short circuiting
cross connection
migraine
could lead to asphyxiation
Term 7 of 80
What should be done if a large amount of organic matter is found in the grit channel?
check the composite sample of tss
measure the flow rate
increase the velocity of the wastewater
increase the chlorine demand
,Term 8 of 80
Which flow rate should you use to calculate the hydraulic loading to a trickling filter?
filamentous bacteria
plant inflow plus recirculated flow
measure the flow rate
recirculate activated sludge
Term 9 of 80
Which is true about the temperature in an anaerobic digester?
Temperature in a digester should be maintained at a constant 100 degrees fahrenheit
Temperature in a digester should not be changed by more than 1 degree Fahrenheit per
day
Temperature in a digester can fluctuate freely without affecting the process
Temperature in a digester is irrelevant to the digestion process
Term 10 of 80
What is the first step of the lockout/tagout procedure?
notify all affected employees that a lockout/tagout system is going to be used and the
reason why
they are indirect measurements of the organic content in the influent
the three main parts of a trickling filter are media, distribution system, and underdrain
addition of chlorine to wastewater at the entrance to the plant used for odor control,
BOD reduction, grease removal, and aid sedimentation
, Term 11 of 80
What is freeboard in a waste stabilization pond?
the area of the pond that is exposed to sunlight
the vertical distance from normal water surface to the top of the levee
the depth of the water in the pond at any given time
wooden inlet and outlet
Term 12 of 80
What is the correct formula for solids in raw wastewater?
Total solids = settleable solids + dissolved solids
Recirculate activated sludge
Total solids - settleable solids = non settleable solids
Non settleable solids + settleable solids = total suspended solids
Term 13 of 80
How does an activated sludge system remove watse from wastewater?
facultative bacteria
physical treatment
biological treatment
biochemical process
Term 14 of 80
The purpose of disinfection is to?
facultative bacteria
destruction or inactivation of pathogenic bacteria
reduce the volume of the sludge and stabilize the solids
kill all microorganisms in the wastewater
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