Exam (elaborations)
WASTEWATER TREATMENT OPERATOR CERTIFICATION TEST 4 QUESTIONS AND ANSWERS
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WASTEWATER TREATMENT OPERATOR CERTIFICATION TEST 4 QUESTIONS AND ANSWERS
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Name: Score:80 Multiple choice questions
Term 1 of 80
What does anaerobic bacteria require for metabolism?
Dissolved oxygen
Oxygen from nitrate
They obtain oxygen by breaking down chemical compounds that contain oxygen, such
as sulfate
Carbon
Term 2 of 80
Scum escaping in the clarifier effluent could be caused by hydraulic overload.
True or False
True
False
Term 3 of 80
Chain driven scrappers called flights are commonly used as mechanical grit collectors.
True or False
True
False
Term 4 of 80
The F/M ratio will decrease when the microorganism population in the aeration tank increases.
True or False
True
False
,Term 5 of 80
Total solids = volatile solids + suspended solids
True or False
True
False
Term 6 of 80
Preventative maintenance is a proactive, programmed, and systematic approach to
maintenance.
True or False
True
False
Term 7 of 80
What terminology indicates the time required to fill a basin at a given flowrate?
Detention time
Short-Circuiting
Hydraulic loading rate
Weir overflow rate
Term 8 of 80
The higher the temperature, the more rapid the rate of disinfection.
True or False
True
False
,Term 9 of 80
What condition is necessary to perform a BOD test?
5 days at 20 degrees Celsius
5 days at 25 degrees Celsius
5 days at 30 degrees Celsius
5 days at 35 degrees Celsius
Term 10 of 80
Chlorine gas in not flammable.
True or False
True
False
Term 11 of 80
MCRT describes the average residence time of the activated sludge particle in the return
sludge pipe.
True or False
True
False
Term 12 of 80
One of the benefits of recirculation for a trickling filter is that it decreases the contact time of
the wastewater with the biological film.
True or False
True
False
, Term 13 of 80
Algae growth will be faster when there is less sunlight.
True or False
True
False
Term 14 of 80
Hydrogen sulfide will deteriorate concrete structures.
True or False
True
False
Term 15 of 80
Chlorine gas is brown in color.
True or False
True
False
Term 16 of 80
What information is needed to calculate the F/M ratio?
BOD and MLSS
BOD and MLVSS
TSS and MLSS
MLSS and settled sludge volume
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