Ca Grade 2 Wastewater Treatment
Operator Practice Exam 1. Latest
2026-2027. Questions & Correct
Verified Answers. Graded A
A grab sample is most suited for these constituents? - ANSresidual chlorine
A pond with a detention time of less than three days will perform similar to?
- ANSsedimentation tank
An increase in the acid/alkalinity ratio for an anaerobic digester means: -
ANSAcid concentration is increasing or alkalinity is decreasing
How does an activated sludge system remove watse from wastewater? -
ANSbiological treatment
How much dissolved oxygen should be in a conventional activated sludge
system if good effluent is being produced? - ANS2 to 4 mg/l
How often should an anaerobic digester be fed? - ANSseveral times a day
How often should the sludge at the bottom of the clarifier be pumped? -
ANSfrequently throughout the day
1
, How will algae impact the chlorine demand in the pond effluent? -
ANSincrease the chlorine demand
If a primary clarifier is placed out of service, then how should a plant with at
least 2 trickling filters operate the system? - ANSoperate the filters in series
If the lab results show that the plant influent sample has COD of 100 mg/l
and a BOD of 300 mg/l, which of the following is most likey true? - ANSlab
results appear incorrect
In general, how will warmer temp affect the settling rate of solids in a
clarifer? - ANSIncrease the settling rate
Prior to entering a permit-required confined space, what should you verify?
- ANSa 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
Select the most accurate statement about extended aeration? - ANSan
oxidation ditch is usually operated in extended aeration mode, and is used
for small flows
The best way to evaluate the effluent TSS concentration from a plant is to: -
ANScheck the composite sample of TSS
The effectiveness of disinfection is determined by: - ANSthe coliform
concentration in the effluent
2
Operator Practice Exam 1. Latest
2026-2027. Questions & Correct
Verified Answers. Graded A
A grab sample is most suited for these constituents? - ANSresidual chlorine
A pond with a detention time of less than three days will perform similar to?
- ANSsedimentation tank
An increase in the acid/alkalinity ratio for an anaerobic digester means: -
ANSAcid concentration is increasing or alkalinity is decreasing
How does an activated sludge system remove watse from wastewater? -
ANSbiological treatment
How much dissolved oxygen should be in a conventional activated sludge
system if good effluent is being produced? - ANS2 to 4 mg/l
How often should an anaerobic digester be fed? - ANSseveral times a day
How often should the sludge at the bottom of the clarifier be pumped? -
ANSfrequently throughout the day
1
, How will algae impact the chlorine demand in the pond effluent? -
ANSincrease the chlorine demand
If a primary clarifier is placed out of service, then how should a plant with at
least 2 trickling filters operate the system? - ANSoperate the filters in series
If the lab results show that the plant influent sample has COD of 100 mg/l
and a BOD of 300 mg/l, which of the following is most likey true? - ANSlab
results appear incorrect
In general, how will warmer temp affect the settling rate of solids in a
clarifer? - ANSIncrease the settling rate
Prior to entering a permit-required confined space, what should you verify?
- ANSa 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
Select the most accurate statement about extended aeration? - ANSan
oxidation ditch is usually operated in extended aeration mode, and is used
for small flows
The best way to evaluate the effluent TSS concentration from a plant is to: -
ANScheck the composite sample of TSS
The effectiveness of disinfection is determined by: - ANSthe coliform
concentration in the effluent
2
