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Wastewater Class B Texas
2026|Comprehensive Q&A For
Certification Success
A sewer manhole provides access into the system for cleaning or service. A
manhole is located - correct-answer - at changes in alignment, diameter, grade,
direction and intersection
New manholes must have an inside diameter of at least ______ feet and the entry
access must be at least ____inches. - correct-answer - 4 feet and 24 inches
In the past ____ was used to construct manholes. This product is prohibited for
construction or grading today - correct-answer - brick and mortar
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Verified clay and Poly Vinyl Chloride (PVC) are the most common pipe materials
used for sewer lines but other materials are available such as - correct-answer -
ductile iron, cast iron, acrylontrile butadiene styrene (ABS) Concrete, polyethylene
& asbestos concrete
Whenever wastewater cannot flow to the treatment plant by _____ a _____ is
typically used - correct-answer - gravity/ lift station
The primary cause of stoppage in a collection system is _____ and _____ -
correct-answer - grease/roots
The _____pump is most commonly used in a lift station - correct-answer -
centrifugal
A centrifugal pump must be ____ or it will not pump - correct-answer - primed
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______ gas is very toxic and deadens the sense of ______ - correct-answer -
Hydrogen Sulifide/smell
______ gas is colorless, odorless and heavier than air - correct-answer - Methane
______ are the smallest , most numerous, and most important of the activated
sludge microorganisms - correct-answer - bacteria
Organic loading refers to the pounds per day of ____ per acre feet or 1,000 cubic
feet of filter media - correct-answer - BOD
Hydraulic loading refers to the volume of ____, including recirculation, applied to
the filter - correct-answer - water
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The most common type(s) of trickling filters are- - correct-answer - Standard rate
(1-4 mgd) and High Rate (10-40 mgd)
Odors occur when treatment becomes - correct-answer - anaerobic
____________gas is greenish-yellow, pungent, heaver than air and highly toxic -
correct-answer - chlorine
One common type of weir design for measuring flow is - correct-answer - V-
Knotch
Inflow and Infiltration (I&I) typically refers to - correct-answer - unaccounted for
water in the system after heavy rains
Wastewater Class B Texas
2026|Comprehensive Q&A For
Certification Success
A sewer manhole provides access into the system for cleaning or service. A
manhole is located - correct-answer - at changes in alignment, diameter, grade,
direction and intersection
New manholes must have an inside diameter of at least ______ feet and the entry
access must be at least ____inches. - correct-answer - 4 feet and 24 inches
In the past ____ was used to construct manholes. This product is prohibited for
construction or grading today - correct-answer - brick and mortar
,2|Page
Verified clay and Poly Vinyl Chloride (PVC) are the most common pipe materials
used for sewer lines but other materials are available such as - correct-answer -
ductile iron, cast iron, acrylontrile butadiene styrene (ABS) Concrete, polyethylene
& asbestos concrete
Whenever wastewater cannot flow to the treatment plant by _____ a _____ is
typically used - correct-answer - gravity/ lift station
The primary cause of stoppage in a collection system is _____ and _____ -
correct-answer - grease/roots
The _____pump is most commonly used in a lift station - correct-answer -
centrifugal
A centrifugal pump must be ____ or it will not pump - correct-answer - primed
,3|Page
______ gas is very toxic and deadens the sense of ______ - correct-answer -
Hydrogen Sulifide/smell
______ gas is colorless, odorless and heavier than air - correct-answer - Methane
______ are the smallest , most numerous, and most important of the activated
sludge microorganisms - correct-answer - bacteria
Organic loading refers to the pounds per day of ____ per acre feet or 1,000 cubic
feet of filter media - correct-answer - BOD
Hydraulic loading refers to the volume of ____, including recirculation, applied to
the filter - correct-answer - water
, 4|Page
The most common type(s) of trickling filters are- - correct-answer - Standard rate
(1-4 mgd) and High Rate (10-40 mgd)
Odors occur when treatment becomes - correct-answer - anaerobic
____________gas is greenish-yellow, pungent, heaver than air and highly toxic -
correct-answer - chlorine
One common type of weir design for measuring flow is - correct-answer - V-
Knotch
Inflow and Infiltration (I&I) typically refers to - correct-answer - unaccounted for
water in the system after heavy rains
