Ca Grade 2 Wastewater Treatment
Operator Practice Exam 1 2026
Questions And Correct Answers
(100% Correct Verified Answers)
removal efficency of settleable solids in a primary clarifier? -
ANSWER//95 to 99% Which of the follwing is true about
pumoing scum from a primary clarifier? - 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? - ANSWER//MLSS is
too low What does the M in F/M ratio represent? -
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? - ANSWER//Increase the
settling rate What could happen if the digester gas is mixed
with air(85 to 95% by volume)? - ANSWER//Cause an explosion
How will algae impact the chlorine demand in the pond effluent?
- ANSWER//increase the chlorine demand Which of the
following is true about a positive displacement pump? -
ANSWER//it must never be started with the discharge valve
closed What is true about the F/M ratio? - 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? - ANSWER//never pipet hazardous material with your
mouth, even if the pipet has been sterialized What is the
recirculation ratio for a trickling filter? - ANSWER//Qr/Q Which
of the following is true about COD and BOD? - ANSWER//they
are indirect measurements of the organic content in the
influent What is the purpose of the grit channel? -
ANSWER//remove heavy inorganic waste Which of the
following is true about the extended aeration process? -
, ANSWER//it does not produce as much waste sludge as other
processes What is the correct formula for solids in raw
wastewater? - ANSWER//Non settleable solids + settleable
solids = total suspended solids What is freeboard in a waste
stabilization pond? - ANSWER//the vertical distance from
normal water surface to the top of the levee What is one of the
requirements for a BOD test? - 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? - ANSWER//maintenance What is common practice in
an activated sludge process? - ANSWER//recirculate activated
sludge Prior to entering a permit-required confined space, what
should you verify? - 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? - ANSWER//test for the
biochemical oxygen demand What should you do if you are
mildly exposed to chlorine gas? - 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? -
ANSWER//household and commercial establishments Why is it
important to maintain a horizontal weir in a clarifier? -
ANSWER//to prevent short circuiting What are mostly removed
in the grit channel? - ANSWER//sand, eggshells, cinders, and
heavier particulate matter How often should an anaerobic
digester be fed? - ANSWER//several times a day What is the
health effect of carbon dioxide? - ANSWER//could lead to
asphyxiation Which of the following enters the headworks of a
treatment plant? - ANSWER//influent Which gas diminishes
your sense of smell? - ANSWER//hydrogen sulfide What type of
microorganism can use nitrate as a source of oxygen? -
ANSWER//facultative bacteria What is the equivalent of 1 mg/l?
- ANSWER//1 ppm Select the most accurate statement about
Operator Practice Exam 1 2026
Questions And Correct Answers
(100% Correct Verified Answers)
removal efficency of settleable solids in a primary clarifier? -
ANSWER//95 to 99% Which of the follwing is true about
pumoing scum from a primary clarifier? - 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? - ANSWER//MLSS is
too low What does the M in F/M ratio represent? -
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? - ANSWER//Increase the
settling rate What could happen if the digester gas is mixed
with air(85 to 95% by volume)? - ANSWER//Cause an explosion
How will algae impact the chlorine demand in the pond effluent?
- ANSWER//increase the chlorine demand Which of the
following is true about a positive displacement pump? -
ANSWER//it must never be started with the discharge valve
closed What is true about the F/M ratio? - 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? - ANSWER//never pipet hazardous material with your
mouth, even if the pipet has been sterialized What is the
recirculation ratio for a trickling filter? - ANSWER//Qr/Q Which
of the following is true about COD and BOD? - ANSWER//they
are indirect measurements of the organic content in the
influent What is the purpose of the grit channel? -
ANSWER//remove heavy inorganic waste Which of the
following is true about the extended aeration process? -
, ANSWER//it does not produce as much waste sludge as other
processes What is the correct formula for solids in raw
wastewater? - ANSWER//Non settleable solids + settleable
solids = total suspended solids What is freeboard in a waste
stabilization pond? - ANSWER//the vertical distance from
normal water surface to the top of the levee What is one of the
requirements for a BOD test? - 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? - ANSWER//maintenance What is common practice in
an activated sludge process? - ANSWER//recirculate activated
sludge Prior to entering a permit-required confined space, what
should you verify? - 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? - ANSWER//test for the
biochemical oxygen demand What should you do if you are
mildly exposed to chlorine gas? - 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? -
ANSWER//household and commercial establishments Why is it
important to maintain a horizontal weir in a clarifier? -
ANSWER//to prevent short circuiting What are mostly removed
in the grit channel? - ANSWER//sand, eggshells, cinders, and
heavier particulate matter How often should an anaerobic
digester be fed? - ANSWER//several times a day What is the
health effect of carbon dioxide? - ANSWER//could lead to
asphyxiation Which of the following enters the headworks of a
treatment plant? - ANSWER//influent Which gas diminishes
your sense of smell? - ANSWER//hydrogen sulfide What type of
microorganism can use nitrate as a source of oxygen? -
ANSWER//facultative bacteria What is the equivalent of 1 mg/l?
- ANSWER//1 ppm Select the most accurate statement about
