Wastewater Class B Texas UPDATED
ACTUAL Exam Questions and CORRECT
Answers
The name of the State Agency responsible for enforcing pollution control laws in Texas -
CORRECT ANSWER Texas Commission of Environmental Quality
The term pathogenic means - CORRECT ANSWER Capable of causing disease
The minimum separation between sewer lines and potable water lines is - CORRECT
ANSWER 9 feet
A licensed wastewater operator is a professional - CORRECT ANSWER 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 - CORRECT
ANSWER Filtering a sample
The Biochemical oxygen Demand (BOD) of a sample is based on - CORRECT
ANSWER Measuring the dissolved oxygen (DO) used
The results of Biochemical Oxygen Demand (BOD) sample taken at a treatment plant tells the
operator - CORRECT ANSWER 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? - CORRECT ANSWER Natural gas, gasoline fumes, hydrogen sulfide and
carbon dioxide
A preferred hydraulic method of cleaning sewer lines is - CORRECT ANSWER Hydro Jet
Cleaner
,Ways to reduce bad odors coming from a collection system - CORRECT
ANSWER 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 - CORRECT
ANSWER ductile iron, Poly Vinyl Chloride (PVC)
Before entering a confined space a worker should - CORRECT ANSWER 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 - CORRECT ANSWER 30-40%
Devices that may be used to determine the level of sewage in a lift station - CORRECT
ANSWER air bubbler, floats, electrodes, Acoustic (sonic)
What is the most important role of aerobic bacteria in the treatment of wastewater? - CORRECT
ANSWER decompose organic matter
The hydraulic loading of a trickling filter may be determined by - CORRECT
ANSWER flow rate and filter area
These can be used to dewater sludge - CORRECT ANSWER belt press, drying beds, solid
bowl centrifuge, gravity thickener
Most important to providing adequate sewage treatment in a stabilization pond - CORRECT
ANSWER sunlight, algae, bacteria and time
, Offensive and objectionable odors which sometimes occur in trickling filters usually indicate -
CORRECT ANSWER septic conditions are present
Dissolved Oxygen (DO) in aeration tank of an activated sludge plant should be maintained at or
about - CORRECT ANSWER 2 to 4 mg/L
Contributes to the infiltration in a collection system - CORRECT ANSWER breaks in the
main lines, high ground water levels, heavy rains, hydro jet cleaning plugged mains
When a centrifuge pump loses prime the - CORRECT ANSWER pump is no longer
moving liquid
A Rotating Biological Contactor (RBC) is - CORRECT ANSWER fixed firm biological
treatment process
Needs to be checked regularly to properly operate an activated sludge treatment plant -
CORRECT ANSWER aeration equipment and mixed liquor solids
Point source discharges are - CORRECT ANSWER discharges that come from pipes or
ditches that are monitored, controlled and inspected
Non-point discharges are - CORRECT ANSWER discharges that have intermittent,
dispersed flows having little or no control
The Texas Water Code establishes the protection of water quality and quantity of the state by -
CORRECT ANSWER setting stream standards, issues permits for discharges, identifies
non-point source controls, and establishes water reuse.
The wastewater plant operator is primarily responsible for - CORRECT ANSWER treating
wastewater discharged into the community
ACTUAL Exam Questions and CORRECT
Answers
The name of the State Agency responsible for enforcing pollution control laws in Texas -
CORRECT ANSWER Texas Commission of Environmental Quality
The term pathogenic means - CORRECT ANSWER Capable of causing disease
The minimum separation between sewer lines and potable water lines is - CORRECT
ANSWER 9 feet
A licensed wastewater operator is a professional - CORRECT ANSWER 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 - CORRECT
ANSWER Filtering a sample
The Biochemical oxygen Demand (BOD) of a sample is based on - CORRECT
ANSWER Measuring the dissolved oxygen (DO) used
The results of Biochemical Oxygen Demand (BOD) sample taken at a treatment plant tells the
operator - CORRECT ANSWER 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? - CORRECT ANSWER Natural gas, gasoline fumes, hydrogen sulfide and
carbon dioxide
A preferred hydraulic method of cleaning sewer lines is - CORRECT ANSWER Hydro Jet
Cleaner
,Ways to reduce bad odors coming from a collection system - CORRECT
ANSWER 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 - CORRECT
ANSWER ductile iron, Poly Vinyl Chloride (PVC)
Before entering a confined space a worker should - CORRECT ANSWER 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 - CORRECT ANSWER 30-40%
Devices that may be used to determine the level of sewage in a lift station - CORRECT
ANSWER air bubbler, floats, electrodes, Acoustic (sonic)
What is the most important role of aerobic bacteria in the treatment of wastewater? - CORRECT
ANSWER decompose organic matter
The hydraulic loading of a trickling filter may be determined by - CORRECT
ANSWER flow rate and filter area
These can be used to dewater sludge - CORRECT ANSWER belt press, drying beds, solid
bowl centrifuge, gravity thickener
Most important to providing adequate sewage treatment in a stabilization pond - CORRECT
ANSWER sunlight, algae, bacteria and time
, Offensive and objectionable odors which sometimes occur in trickling filters usually indicate -
CORRECT ANSWER septic conditions are present
Dissolved Oxygen (DO) in aeration tank of an activated sludge plant should be maintained at or
about - CORRECT ANSWER 2 to 4 mg/L
Contributes to the infiltration in a collection system - CORRECT ANSWER breaks in the
main lines, high ground water levels, heavy rains, hydro jet cleaning plugged mains
When a centrifuge pump loses prime the - CORRECT ANSWER pump is no longer
moving liquid
A Rotating Biological Contactor (RBC) is - CORRECT ANSWER fixed firm biological
treatment process
Needs to be checked regularly to properly operate an activated sludge treatment plant -
CORRECT ANSWER aeration equipment and mixed liquor solids
Point source discharges are - CORRECT ANSWER discharges that come from pipes or
ditches that are monitored, controlled and inspected
Non-point discharges are - CORRECT ANSWER discharges that have intermittent,
dispersed flows having little or no control
The Texas Water Code establishes the protection of water quality and quantity of the state by -
CORRECT ANSWER setting stream standards, issues permits for discharges, identifies
non-point source controls, and establishes water reuse.
The wastewater plant operator is primarily responsible for - CORRECT ANSWER treating
wastewater discharged into the community
