WASTEWATER CLASS B TEXAS TEST BANK
2026 UPDATED QUESTIONS WITH
ANSWERS GRADED A+
⩥ The term pathogenic means. Answer: Capable of causing disease
⩥ The minimum separation between sewer lines and potable water lines
is. Answer: 9 feet
⩥ A licensed wastewater operator is a professional. 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.
Answer: Filtering a sample
⩥ The Biochemical oxygen Demand (BOD) of a sample is based on.
Answer: Measuring the dissolved oxygen (DO) used
⩥ The results of Biochemical Oxygen Demand (BOD) sample taken at a
treatment plant tells the operator. 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?. Answer: Natural gas, gasoline
fumes, hydrogen sulfide and carbon dioxide
⩥ A preferred hydraulic method of cleaning sewer lines is. Answer:
Hydro Jet Cleaner
⩥ Ways to reduce bad odors coming from a collection system. 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. Answer: ductile iron, Poly Vinyl Chloride (PVC)
⩥ Before entering a confined space a worker should. 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. Answer: 30-40%
⩥ Devices that may be used to determine the level of sewage in a lift
station. Answer: air bubbler, floats, electrodes, Acoustic (sonic)
, ⩥ What is the most important role of aerobic bacteria in the treatment of
wastewater?. Answer: decompose organic matter
⩥ The hydraulic loading of a trickling filter may be determined by.
Answer: flow rate and filter area
⩥ These can be used to dewater sludge. Answer: belt press, drying beds,
solid bowl centrifuge, gravity thickener
⩥ Most important to providing adequate sewage treatment in a
stabilization pond. Answer: sunlight, algae, bacteria and time
⩥ Offensive and objectionable odors which sometimes occur in trickling
filters usually indicate. Answer: septic conditions are present
⩥ Dissolved Oxygen (DO) in aeration tank of an activated sludge plant
should be maintained at or about. Answer: 2 to 4 mg/L
⩥ Contributes to the infiltration in a collection system. Answer: breaks
in the main lines, high ground water levels, heavy rains, hydro jet
cleaning plugged mains
⩥ When a centrifuge pump loses prime the. Answer: pump is no longer
moving liquid
2026 UPDATED QUESTIONS WITH
ANSWERS GRADED A+
⩥ The term pathogenic means. Answer: Capable of causing disease
⩥ The minimum separation between sewer lines and potable water lines
is. Answer: 9 feet
⩥ A licensed wastewater operator is a professional. 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.
Answer: Filtering a sample
⩥ The Biochemical oxygen Demand (BOD) of a sample is based on.
Answer: Measuring the dissolved oxygen (DO) used
⩥ The results of Biochemical Oxygen Demand (BOD) sample taken at a
treatment plant tells the operator. 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?. Answer: Natural gas, gasoline
fumes, hydrogen sulfide and carbon dioxide
⩥ A preferred hydraulic method of cleaning sewer lines is. Answer:
Hydro Jet Cleaner
⩥ Ways to reduce bad odors coming from a collection system. 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. Answer: ductile iron, Poly Vinyl Chloride (PVC)
⩥ Before entering a confined space a worker should. 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. Answer: 30-40%
⩥ Devices that may be used to determine the level of sewage in a lift
station. Answer: air bubbler, floats, electrodes, Acoustic (sonic)
, ⩥ What is the most important role of aerobic bacteria in the treatment of
wastewater?. Answer: decompose organic matter
⩥ The hydraulic loading of a trickling filter may be determined by.
Answer: flow rate and filter area
⩥ These can be used to dewater sludge. Answer: belt press, drying beds,
solid bowl centrifuge, gravity thickener
⩥ Most important to providing adequate sewage treatment in a
stabilization pond. Answer: sunlight, algae, bacteria and time
⩥ Offensive and objectionable odors which sometimes occur in trickling
filters usually indicate. Answer: septic conditions are present
⩥ Dissolved Oxygen (DO) in aeration tank of an activated sludge plant
should be maintained at or about. Answer: 2 to 4 mg/L
⩥ Contributes to the infiltration in a collection system. Answer: breaks
in the main lines, high ground water levels, heavy rains, hydro jet
cleaning plugged mains
⩥ When a centrifuge pump loses prime the. Answer: pump is no longer
moving liquid
