Ca Grade 2 Wastewater Treatment
Operator Practice Exam 1 with
answers latest 2026/2027 update
What is the purpose of a Parshall Flume? - correct answer>>>Measure the flow rate
What is the typical removal efficency of settleable solids in a primary clarifier? - correct
answer>>>95 to 99%
Which of the follwing is true about pumoing scum from a primary clarifier? - correct
answer>>>scum causes more piping problems than other substances pumped at a
wastewater treatment plant
What might cause thick billows of white sudsy foam in the aeration tank? - correct
answer>>>MLSS is too low
What does the M in F/M ratio represent? - correct answer>>>The mixed liquor volatile
suspended solids in the aeration tank
In general, how will warmer temp affect the settling rate of solids in a clarifer? - correct
answer>>>Increase the settling rate
What could happen if the digester gas is mixed with air(85 to 95% by volume)? - correct
answer>>>Cause an explosion
How will algae impact the chlorine demand in the pond effluent? - correct
answer>>>increase the chlorine demand
Which of the following is true about a positive displacement pump? - correct
answer>>>it must never be started with the discharge valve closed
What is true about the F/M ratio? - correct answer>>>the volume of the secondary
clarifier is not needed to determine the f/m ratio
Which of the following is one of the basic rules of lab work? - correct answer>>>never
pipet hazardous material with your mouth, even if the pipet has been sterialized
What is the recirculation ratio for a trickling filter? - correct answer>>>Qr/Q
Which of the following is true about COD and BOD? - correct answer>>>they are
indirect measurements of the organic content in the influent
, What is the purpose of the grit channel? - correct answer>>>remove heavy inorganic
waste
What is the methane content in a properly operating anaerobic digester? - correct
answer>>>65 to 70% by volume
What will the addition of chlorine gas do to the pH of wastewater? - correct
answer>>>decrease the pH
Which of the following is true about the extended aeration process? - correct
answer>>>it does not produce as much waste sludge as other processes
What is the correct formula for solids in raw wastewater? - correct answer>>>Non
settleable solids + settleable solids = total suspended solids
What is freeboard in a waste stabilization pond? - correct answer>>>the vertical
distance from normal water surface to the top of the levee
What is one of the requirements for a BOD test? - correct answer>>>The BOD bottle
should be completely filled to the top
What should be scheduled every 3 months for a flamer arrester in an anaerobic
digester? - correct answer>>>maintenance
What is common practice in an activated sludge process? - correct
answer>>>recirculate activated sludge
Prior to entering a permit-required confined space, what should you verify? - correct
answer>>>a standby person should be located outside the entrance to the confined
space, while another person should be within sight or call of the standby person
What is a common way to determine the organic strength of wastes in the influent? -
correct answer>>>test for the biochemical oxygen demand
What should you do if you are mildly exposed to chlorine gas? - correct
answer>>>immediately evacuate the contaminated area, remian calm, keep warm.
breath lightly, avoid coughing
What are the main sources of domestic sewage in the collection system? - correct
answer>>>household and commercial establishments
Why is it important to maintain a horizontal weir in a clarifier? - correct answer>>>to
prevent short circuiting
What are mostly removed in the grit channel? - correct answer>>>sand, eggshells,
cinders, and heavier particulate matter
Operator Practice Exam 1 with
answers latest 2026/2027 update
What is the purpose of a Parshall Flume? - correct answer>>>Measure the flow rate
What is the typical removal efficency of settleable solids in a primary clarifier? - correct
answer>>>95 to 99%
Which of the follwing is true about pumoing scum from a primary clarifier? - correct
answer>>>scum causes more piping problems than other substances pumped at a
wastewater treatment plant
What might cause thick billows of white sudsy foam in the aeration tank? - correct
answer>>>MLSS is too low
What does the M in F/M ratio represent? - correct answer>>>The mixed liquor volatile
suspended solids in the aeration tank
In general, how will warmer temp affect the settling rate of solids in a clarifer? - correct
answer>>>Increase the settling rate
What could happen if the digester gas is mixed with air(85 to 95% by volume)? - correct
answer>>>Cause an explosion
How will algae impact the chlorine demand in the pond effluent? - correct
answer>>>increase the chlorine demand
Which of the following is true about a positive displacement pump? - correct
answer>>>it must never be started with the discharge valve closed
What is true about the F/M ratio? - correct answer>>>the volume of the secondary
clarifier is not needed to determine the f/m ratio
Which of the following is one of the basic rules of lab work? - correct answer>>>never
pipet hazardous material with your mouth, even if the pipet has been sterialized
What is the recirculation ratio for a trickling filter? - correct answer>>>Qr/Q
Which of the following is true about COD and BOD? - correct answer>>>they are
indirect measurements of the organic content in the influent
, What is the purpose of the grit channel? - correct answer>>>remove heavy inorganic
waste
What is the methane content in a properly operating anaerobic digester? - correct
answer>>>65 to 70% by volume
What will the addition of chlorine gas do to the pH of wastewater? - correct
answer>>>decrease the pH
Which of the following is true about the extended aeration process? - correct
answer>>>it does not produce as much waste sludge as other processes
What is the correct formula for solids in raw wastewater? - correct answer>>>Non
settleable solids + settleable solids = total suspended solids
What is freeboard in a waste stabilization pond? - correct answer>>>the vertical
distance from normal water surface to the top of the levee
What is one of the requirements for a BOD test? - correct answer>>>The BOD bottle
should be completely filled to the top
What should be scheduled every 3 months for a flamer arrester in an anaerobic
digester? - correct answer>>>maintenance
What is common practice in an activated sludge process? - correct
answer>>>recirculate activated sludge
Prior to entering a permit-required confined space, what should you verify? - correct
answer>>>a standby person should be located outside the entrance to the confined
space, while another person should be within sight or call of the standby person
What is a common way to determine the organic strength of wastes in the influent? -
correct answer>>>test for the biochemical oxygen demand
What should you do if you are mildly exposed to chlorine gas? - correct
answer>>>immediately evacuate the contaminated area, remian calm, keep warm.
breath lightly, avoid coughing
What are the main sources of domestic sewage in the collection system? - correct
answer>>>household and commercial establishments
Why is it important to maintain a horizontal weir in a clarifier? - correct answer>>>to
prevent short circuiting
What are mostly removed in the grit channel? - correct answer>>>sand, eggshells,
cinders, and heavier particulate matter
