Texas Wastewater Class B Exam Questions with 100% Correct Answers
Latest 2025
The name of the State Agency responsible for enforcing pollution control
laws in Texas
Texas Commission of Environmental Quality
The term pathogenic means
Capable of causing disease
The minimum separation between sewer lines and potable water lines is
9 feet
A licensed wastewater operator is a professional
consistently does best job possible, practices personal safety, strives to
improve job knowledge, strives to keep the plant and collection system in
the best appearance and working order
An important step in testing a sample for Total Suspended Solids is
Filtering a sample
The Biochemical oxygen Demand (BOD) of a sample is based on
Measuring the dissolved oxygen (DO) used
The results of Biochemical Oxygen Demand (BOD) sample taken at a treatment
plant tells the operator
How the plant was operating 5 days ago
Which of the following are dangerous gasses that are likely to be present
in lift stations and manholes?
Natural gas, gasoline fumes, hydrogen sulfide and carbon dioxide
A preferred hydraulic method of cleaning sewer lines is
Hydro Jet Cleaner
,Texas Wastewater Class B Exam Questions with 100% Correct Answers
Latest 2025
Ways to reduce bad odors coming from a collection system
routinely cleaning slow running or low flow lines, adding chlorine or
hydrogen peroxide to the collection system
Types of pipe that are commonly used in wastewater collection system
ductile iron, Poly Vinyl Chloride (PVC)
Before entering a confined space a worker should
Use approved monitoring device and check for the presence of dangerous
gasses, ventilate the space with a blower, wear a safety harness and attach
a life line
A properly designed and operated primary sedimentation tank should remove
_____ percent of incoming BOD
30-40%
Devices that may be used to determine the level of sewage in a lift station
air bubbler, floats, electrodes, Acoustic (sonic)
What is the most important role of aerobic bacteria in the treatment of
wastewater?
decompose organic matter
The hydraulic loading of a trickling filter may be determined by
flow rate and filter area
These can be used to dewater sludge
belt press, drying beds, solid bowl centrifuge, gravity thickener
, Texas Wastewater Class B Exam Questions with 100% Correct Answers
Latest 2025
Most important to providing adequate sewage treatment in a stabilization
pond
sunlight, algae, bacteria and time
Offensive and objectionable odors which sometimes occur in trickling
filters usually indicate
septic conditions are present
Dissolved Oxygen (DO) in aeration tank of an activated sludge plant should
be maintained at or about
2 to 4 mg/L
Contributes to the infiltration in a collection system
breaks in the main lines, high ground water levels, heavy rains, hydro jet
cleaning plugged mains
When a centrifuge pump loses prime the
pump is no longer moving liquid
A Rotating Biological Contactor (RBC) is
fixed firm biological treatment process
Needs to be checked regularly to properly operate an activated sludge
treatment plant
aeration equipment and mixed liquor solids
Point source discharges are
discharges that come from pipes or ditches that are monitored, controlled
and inspected
Latest 2025
The name of the State Agency responsible for enforcing pollution control
laws in Texas
Texas Commission of Environmental Quality
The term pathogenic means
Capable of causing disease
The minimum separation between sewer lines and potable water lines is
9 feet
A licensed wastewater operator is a professional
consistently does best job possible, practices personal safety, strives to
improve job knowledge, strives to keep the plant and collection system in
the best appearance and working order
An important step in testing a sample for Total Suspended Solids is
Filtering a sample
The Biochemical oxygen Demand (BOD) of a sample is based on
Measuring the dissolved oxygen (DO) used
The results of Biochemical Oxygen Demand (BOD) sample taken at a treatment
plant tells the operator
How the plant was operating 5 days ago
Which of the following are dangerous gasses that are likely to be present
in lift stations and manholes?
Natural gas, gasoline fumes, hydrogen sulfide and carbon dioxide
A preferred hydraulic method of cleaning sewer lines is
Hydro Jet Cleaner
,Texas Wastewater Class B Exam Questions with 100% Correct Answers
Latest 2025
Ways to reduce bad odors coming from a collection system
routinely cleaning slow running or low flow lines, adding chlorine or
hydrogen peroxide to the collection system
Types of pipe that are commonly used in wastewater collection system
ductile iron, Poly Vinyl Chloride (PVC)
Before entering a confined space a worker should
Use approved monitoring device and check for the presence of dangerous
gasses, ventilate the space with a blower, wear a safety harness and attach
a life line
A properly designed and operated primary sedimentation tank should remove
_____ percent of incoming BOD
30-40%
Devices that may be used to determine the level of sewage in a lift station
air bubbler, floats, electrodes, Acoustic (sonic)
What is the most important role of aerobic bacteria in the treatment of
wastewater?
decompose organic matter
The hydraulic loading of a trickling filter may be determined by
flow rate and filter area
These can be used to dewater sludge
belt press, drying beds, solid bowl centrifuge, gravity thickener
, Texas Wastewater Class B Exam Questions with 100% Correct Answers
Latest 2025
Most important to providing adequate sewage treatment in a stabilization
pond
sunlight, algae, bacteria and time
Offensive and objectionable odors which sometimes occur in trickling
filters usually indicate
septic conditions are present
Dissolved Oxygen (DO) in aeration tank of an activated sludge plant should
be maintained at or about
2 to 4 mg/L
Contributes to the infiltration in a collection system
breaks in the main lines, high ground water levels, heavy rains, hydro jet
cleaning plugged mains
When a centrifuge pump loses prime the
pump is no longer moving liquid
A Rotating Biological Contactor (RBC) is
fixed firm biological treatment process
Needs to be checked regularly to properly operate an activated sludge
treatment plant
aeration equipment and mixed liquor solids
Point source discharges are
discharges that come from pipes or ditches that are monitored, controlled
and inspected
