TEXAS WASTEWATER CLASS B EXAM (2024-
2025) QUESTION AND ANSWERS.
The primary cause of stoppage in a collection system is _____
and _____ - Answers>>>grease/roots
The _____pump is most commonly used in a lift station -
Answers>>>centrifugal
Extensive use of garbage disposals (grinders) in a community
would likely have the following effect on the collection
system - Answers>>>Increase the amount of flow, solids, and
grease
The minimum size for a gravity flow sewer line on city right-
of-way and the minimum grade is - Answers>>>6 inch and a
grade of 0.50 percent
The most accurate way to find the average wastewater flow
rate in an existing 10-inch sewer main is -
Answers>>>Obtaining actual flow data & verifying with field
data
What is the greatest advantage for using fiberglass manholes
in areas with high groundwater? - Answers>>>fiberglass is
not subject to infiltration
A __________ pump would most likely be used when
discharging into a 10" diameter pressure sewer main. -
Answers>>>Centrifugal
, TEXAS WASTEWATER CLASS B EXAM (2024-
2025) QUESTION AND ANSWERS.
Excessive power consumption by a pump could be caused by
- Answers>>>Worn bearings and worn impeller
Trench safety is a great concern in Texas. OSHA requires that
anytime an excavation is greater than __ feet deep it must be
protected by ______. - Answers>>>5 feet / An approved
Trench Box, Shoring, or Sloping
In an excavation if a ladder is used as a means of exit, it must
extend ________feet above the ground and be secured and
within ____ feet laterally of anyone in the excavation. -
Answers>>>3 feet / 25 feet laterally
A ____________ would be the best to determine if a storm
drain is connected to a sanitary sewer line. -
Answers>>>Smoke Test
_________ would most commonly be used to seal a number
of joint leaks on a main with minimal interruption -
Answers>>>internal grouting
Pre-treatment of wastewater would include: -
Answers>>>Coarse or fine screening, grinding and grit
removal and grease removal and pre-aeration
, TEXAS WASTEWATER CLASS B EXAM (2024-
2025) QUESTION AND ANSWERS.
Primary treatment of wastewater would include -
Answers>>>settling tanks or basins, scum collection and
removal, sludge collection and removal
Secondary treatment typically used today would include -
Answers>>>Stabilization ponds, trickling filters, rotating
biological contractors (RBC) & activated sludge
Essential components of the wastewater collection system
include - Answers>>>Sewer mains & piping, Lift Stations,
Pumps, Grease & Sand traps, & Manholes
Grit removal would be considered - Answers>>>A part of
Primary Treatment
The protozoa that causes dysentery would most likely be
destroyed by - Answers>>>Disinfection
Using final plant effluent in cooling towers would be a -
Answers>>>Beneficial way to reuse treated effluent
TCEQ may authorize discharge of untreated wastewater into
or near a receiving stream in extreme cases. This is referred to
as - Answers>>>Bypass
2025) QUESTION AND ANSWERS.
The primary cause of stoppage in a collection system is _____
and _____ - Answers>>>grease/roots
The _____pump is most commonly used in a lift station -
Answers>>>centrifugal
Extensive use of garbage disposals (grinders) in a community
would likely have the following effect on the collection
system - Answers>>>Increase the amount of flow, solids, and
grease
The minimum size for a gravity flow sewer line on city right-
of-way and the minimum grade is - Answers>>>6 inch and a
grade of 0.50 percent
The most accurate way to find the average wastewater flow
rate in an existing 10-inch sewer main is -
Answers>>>Obtaining actual flow data & verifying with field
data
What is the greatest advantage for using fiberglass manholes
in areas with high groundwater? - Answers>>>fiberglass is
not subject to infiltration
A __________ pump would most likely be used when
discharging into a 10" diameter pressure sewer main. -
Answers>>>Centrifugal
, TEXAS WASTEWATER CLASS B EXAM (2024-
2025) QUESTION AND ANSWERS.
Excessive power consumption by a pump could be caused by
- Answers>>>Worn bearings and worn impeller
Trench safety is a great concern in Texas. OSHA requires that
anytime an excavation is greater than __ feet deep it must be
protected by ______. - Answers>>>5 feet / An approved
Trench Box, Shoring, or Sloping
In an excavation if a ladder is used as a means of exit, it must
extend ________feet above the ground and be secured and
within ____ feet laterally of anyone in the excavation. -
Answers>>>3 feet / 25 feet laterally
A ____________ would be the best to determine if a storm
drain is connected to a sanitary sewer line. -
Answers>>>Smoke Test
_________ would most commonly be used to seal a number
of joint leaks on a main with minimal interruption -
Answers>>>internal grouting
Pre-treatment of wastewater would include: -
Answers>>>Coarse or fine screening, grinding and grit
removal and grease removal and pre-aeration
, TEXAS WASTEWATER CLASS B EXAM (2024-
2025) QUESTION AND ANSWERS.
Primary treatment of wastewater would include -
Answers>>>settling tanks or basins, scum collection and
removal, sludge collection and removal
Secondary treatment typically used today would include -
Answers>>>Stabilization ponds, trickling filters, rotating
biological contractors (RBC) & activated sludge
Essential components of the wastewater collection system
include - Answers>>>Sewer mains & piping, Lift Stations,
Pumps, Grease & Sand traps, & Manholes
Grit removal would be considered - Answers>>>A part of
Primary Treatment
The protozoa that causes dysentery would most likely be
destroyed by - Answers>>>Disinfection
Using final plant effluent in cooling towers would be a -
Answers>>>Beneficial way to reuse treated effluent
TCEQ may authorize discharge of untreated wastewater into
or near a receiving stream in extreme cases. This is referred to
as - Answers>>>Bypass
