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Ca Grade 2 Wastewater Treatment Operator Practice Exam 1
TEST FINAL EXAM AND PRACTICE EXAM 20262027 BANK 2
VERSIONS QUESTIONS WITH DETAILED VERIFIED
ANSWERS EXAM QUESTIONS WILL COME FROM HERE
(100% CORRECT ANSWERS A+ GRADED
What is the methane content in a properly operating anaerobic
digester? - ANSWERS--65 to 70% by volume
What will the addition of chlorine gas do to the pH of wastewater? -
ANSWERS--decrease the pH
What is the purpose of a Parshall Flume? - ANSWERS--Measure the flow
rate
What is the typical removal efficency of settleable solids in a primary
clarifier? - ANSWERS--95 to 99%
Which of the follwing is true about pumoing scum from a primary
clarifier? - ANSWERS--scum causes more piping problems than other
substances pumped at a wastewater treatment plant
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What might cause thick billows of white sudsy foam in the aeration
tank? - ANSWERS--MLSS is too low
What does the M in F/M ratio represent? - ANSWERS--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? - ANSWERS--Increase the settling rate
What could happen if the digester gas is mixed with air(85 to 95% by
volume)? - ANSWERS--Cause an explosion
How will algae impact the chlorine demand in the pond effluent? -
ANSWERS--increase the chlorine demand
Which of the following is true about a positive displacement pump? -
ANSWERS--it must never be started with the discharge valve closed
What is true about the F/M ratio? - ANSWERS--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? -
ANSWERS--never pipet hazardous material with your mouth, even if the
pipet has been sterialized
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What is the recirculation ratio for a trickling filter? - ANSWERS--Qr/Q
Which of the following is true about COD and BOD? - ANSWERS--they
are indirect measurements of the organic content in the influent
What is the purpose of the grit channel? - ANSWERS--remove heavy
inorganic waste
Which of the following is true about the extended aeration process? -
ANSWERS--it does not produce as much waste sludge as other
processes
What is the correct formula for solids in raw wastewater? - ANSWERS--
Non settleable solids + settleable solids = total suspended solids
What is freeboard in a waste stabilization pond? - ANSWERS--the
vertical distance from normal water surface to the top of the levee
What is one of the requirements for a BOD test? - ANSWERS--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? - ANSWERS--maintenance
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What is common practice in an activated sludge process? - ANSWERS--
recirculate activated sludge
Prior to entering a permit-required confined space, what should you
verify? - ANSWERS--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? - ANSWERS--test for the biochemical oxygen demand
What should you do if you are mildly exposed to chlorine gas? -
ANSWERS--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? - ANSWERS--household and commercial establishments
Why is it important to maintain a horizontal weir in a clarifier? -
ANSWERS--to prevent short circuiting
What are mostly removed in the grit channel? - ANSWERS--sand,
eggshells, cinders, and heavier particulate matter
Ca Grade 2 Wastewater Treatment Operator Practice Exam 1
TEST FINAL EXAM AND PRACTICE EXAM 20262027 BANK 2
VERSIONS QUESTIONS WITH DETAILED VERIFIED
ANSWERS EXAM QUESTIONS WILL COME FROM HERE
(100% CORRECT ANSWERS A+ GRADED
What is the methane content in a properly operating anaerobic
digester? - ANSWERS--65 to 70% by volume
What will the addition of chlorine gas do to the pH of wastewater? -
ANSWERS--decrease the pH
What is the purpose of a Parshall Flume? - ANSWERS--Measure the flow
rate
What is the typical removal efficency of settleable solids in a primary
clarifier? - ANSWERS--95 to 99%
Which of the follwing is true about pumoing scum from a primary
clarifier? - ANSWERS--scum causes more piping problems than other
substances pumped at a wastewater treatment plant
,2|Page
What might cause thick billows of white sudsy foam in the aeration
tank? - ANSWERS--MLSS is too low
What does the M in F/M ratio represent? - ANSWERS--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? - ANSWERS--Increase the settling rate
What could happen if the digester gas is mixed with air(85 to 95% by
volume)? - ANSWERS--Cause an explosion
How will algae impact the chlorine demand in the pond effluent? -
ANSWERS--increase the chlorine demand
Which of the following is true about a positive displacement pump? -
ANSWERS--it must never be started with the discharge valve closed
What is true about the F/M ratio? - ANSWERS--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? -
ANSWERS--never pipet hazardous material with your mouth, even if the
pipet has been sterialized
,3|Page
What is the recirculation ratio for a trickling filter? - ANSWERS--Qr/Q
Which of the following is true about COD and BOD? - ANSWERS--they
are indirect measurements of the organic content in the influent
What is the purpose of the grit channel? - ANSWERS--remove heavy
inorganic waste
Which of the following is true about the extended aeration process? -
ANSWERS--it does not produce as much waste sludge as other
processes
What is the correct formula for solids in raw wastewater? - ANSWERS--
Non settleable solids + settleable solids = total suspended solids
What is freeboard in a waste stabilization pond? - ANSWERS--the
vertical distance from normal water surface to the top of the levee
What is one of the requirements for a BOD test? - ANSWERS--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? - ANSWERS--maintenance
, 4|Page
What is common practice in an activated sludge process? - ANSWERS--
recirculate activated sludge
Prior to entering a permit-required confined space, what should you
verify? - ANSWERS--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? - ANSWERS--test for the biochemical oxygen demand
What should you do if you are mildly exposed to chlorine gas? -
ANSWERS--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? - ANSWERS--household and commercial establishments
Why is it important to maintain a horizontal weir in a clarifier? -
ANSWERS--to prevent short circuiting
What are mostly removed in the grit channel? - ANSWERS--sand,
eggshells, cinders, and heavier particulate matter
