Wastewater Treatment Operator Certification Test #1 Questions With 100% Verified Answers
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Module
Wastewater Treatment Operator Certification
Institution
Wastewater Treatment Operator Certification
Wastewater Treatment Operator
Certification Test #1 Questions With 100%
Verified Answers
What is the methane content in a properly operation anaerobic digester?
A) 30 to 35% by volume
B) 1 to 2% by volume
C) 65 to 70% by volume
D) 15 to 20% by volume - answerC) 65 to 70% by volume (v.2 pg 15...
D) 10 to 15% - answer✔A) 95 to 99% (v.1 pg 129)
Which of the following is true about pumping scum from a primary clarifier?
A) Pumping scum is less problematic during colder weather.
B) Scum rarely leads to plugged pipelines due to its viscous nature.
C) Scum causes more piping problems than other substances pumped at a wastewater treatment
plant.
D) Scum causes the least amount of piping problems among all the substances pumped at a
wastewater treatment plant. - answer✔C) Scum causes more piping problems than other
substances pumped at a wastewater treatment plant. (v.2 pg 449)
What might cause thick billows of white sudsy foam in the aeration tank?
A) MLSS is too high
B) Temperature in the aeration tank is too low
C) Old sludge
D) MLSS is too low - answer✔D) MLSS is too low (v.2 pg 53,75)
What does the "M" in F/M ratio represent?
A) MLSS in aeration tank
B) The influent BOD loading rate into the aeration tank
C) The mixed liquor volatile suspended solids in the aeration tank
D) The mass of inorganic solids in the aeration tank - answer✔C) The mixed liquor volatile
suspended solids in the aeration tank (v.2 pg 16)
In general, how will warmer temperature affect the settling rate of solids in a clarifier?
A) Decrease settling rate
B) Increase the settling rate
C) Temperature will not affect the settling rate
D) Worsen the settling rate - answer✔B) Increase the settling rate (v.1 pg 134)
What could happen if the digester gas is mixed with air (85 to 95% by volume)?
A) Cause an explosion
B) Improve efficiency of digestion
C) The bacteria will become aerobic and increase VSR
D) The digester becomes safer to operate due to less toxic gas in the system - answer✔A) Cause
an explosion (v.2 pg 158)
How will algae impact the chlorine demand in the pond effluent?
A) Slightly decreases chlorine demand
B) Does not affect chlorine demand
C) Significantly decreases chlorine demand
D) Increases chlorine demand - answer✔D) Increases chlorine demand
Which of the following is true about positive displacement pumps?
A) It is a type of centrifugal pump
B) Suction valve should be closed when the pump is started
C) It must never be started with the discharge valve closed
D) Adds head to liquid using several impellers - answer✔C) It must never be started with the
discharge valve closed (v.2 pg 435)
What is true about the F/M ratio?
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