Ca Grade 2 Wastewater Treatment
Operator Practice Exam 1 2026 Questions
And Correct Answers (100% Correct
Verified Answers)
What is the purpose of the grit channel? - CORRECT ANSWER ✔✔ -
remove heavy inorganic waste
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
Pg. 1
, 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
Pg. 2
Operator Practice Exam 1 2026 Questions
And Correct Answers (100% Correct
Verified Answers)
What is the purpose of the grit channel? - CORRECT ANSWER ✔✔ -
remove heavy inorganic waste
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
Pg. 1
, 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
Pg. 2
