Ca Grade 2 Wastewater Treatment Operator Practice
Exam 1 Questions And Correct Answers
(Verified Answers)
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
Which of the following is true about the extended aeration process? - CORRECT
ANSWER ✔✔ - it does not produce as much waste sludge as other processes
Pg. 1
, 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
Pg. 2
Exam 1 Questions And Correct Answers
(Verified Answers)
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
Which of the following is true about the extended aeration process? - CORRECT
ANSWER ✔✔ - it does not produce as much waste sludge as other processes
Pg. 1
, 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
Pg. 2
