Wastewater Class B Texas Exam
Questions With 100% Accurate
Answers Rated A+
The name of the State Agency responsible for enforcing pollution control laws in Texas -
CORRECT ANSWER-Texas Commission of Environmental Quality
In the activated sludge system, Hydraulic Wash Out can be controlled by - CORRECT
ANSWER-flow equalization, Additional clarifier capacity or inflow reduction
In the activated sludge system, if the operator observed Boiling action, Violent
turbulence throughout the aeration tank surface, Large air bubbles 1/2 inch or greater,
the operator would suspect- - CORRECT ANSWER-Over aeration resulting in high DO
and or floc shearing therefore the operator should reduce the air SCFM to get DO into
the proper range
In the activated sludge system if the operator observed uneven surface aeration, dead
spots or inadequate mixing in some areas, the operator would suspect - CORRECT
ANSWER-Plugged diffusers
In the activated sludge system, if the operator observes white thick billowing sudsy foam
on the aeration tank, the operator would suspect - CORRECT ANSWER-Overloaded
aeration tank and or excessive sludge wasting
In the activated sludge system, if the operator observes excessive air being used with
no apparent change in organic or hydraulic loading, the operator would suspect -
CORRECT ANSWER-Leaks in the system piping, Plugged air diffusers & High organic
loading
,The maximum safe withdrawal rate for a 150 lb chlorine cylinder is - CORRECT
ANSWER-40 lbs
To determine the approximate number of gallons per day being discharged to the
collection system, multiply the population by ____ gallons/person/day. - CORRECT
ANSWER-100
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
Questions With 100% Accurate
Answers Rated A+
The name of the State Agency responsible for enforcing pollution control laws in Texas -
CORRECT ANSWER-Texas Commission of Environmental Quality
In the activated sludge system, Hydraulic Wash Out can be controlled by - CORRECT
ANSWER-flow equalization, Additional clarifier capacity or inflow reduction
In the activated sludge system, if the operator observed Boiling action, Violent
turbulence throughout the aeration tank surface, Large air bubbles 1/2 inch or greater,
the operator would suspect- - CORRECT ANSWER-Over aeration resulting in high DO
and or floc shearing therefore the operator should reduce the air SCFM to get DO into
the proper range
In the activated sludge system if the operator observed uneven surface aeration, dead
spots or inadequate mixing in some areas, the operator would suspect - CORRECT
ANSWER-Plugged diffusers
In the activated sludge system, if the operator observes white thick billowing sudsy foam
on the aeration tank, the operator would suspect - CORRECT ANSWER-Overloaded
aeration tank and or excessive sludge wasting
In the activated sludge system, if the operator observes excessive air being used with
no apparent change in organic or hydraulic loading, the operator would suspect -
CORRECT ANSWER-Leaks in the system piping, Plugged air diffusers & High organic
loading
,The maximum safe withdrawal rate for a 150 lb chlorine cylinder is - CORRECT
ANSWER-40 lbs
To determine the approximate number of gallons per day being discharged to the
collection system, multiply the population by ____ gallons/person/day. - CORRECT
ANSWER-100
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
