1|Page
CA GRADE 2 WASTEWATER
TREATMENT OPERATOR PRACTICE
EXAM 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
,2|Page
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
, 3|Page
What are mostly removed in the grit channel? - correct-answer -sand, eggshells,
cinders, and heavier particulate matter
How often should an anaerobic digester be fed? - correct-answer -several times a
day
What is the health effect of carbon dioxide? - correct-answer -could lead to
asphyxiation
Which of the following enters the headworks of a treatment plant? - correct-
answer -influent
Which gas diminishes your sense of smell? - correct-answer -hydrogen sulfide
CA GRADE 2 WASTEWATER
TREATMENT OPERATOR PRACTICE
EXAM 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
,2|Page
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
, 3|Page
What are mostly removed in the grit channel? - correct-answer -sand, eggshells,
cinders, and heavier particulate matter
How often should an anaerobic digester be fed? - correct-answer -several times a
day
What is the health effect of carbon dioxide? - correct-answer -could lead to
asphyxiation
Which of the following enters the headworks of a treatment plant? - correct-
answer -influent
Which gas diminishes your sense of smell? - correct-answer -hydrogen sulfide
