TEXAS WASTEWATER EXAMINATION VERSIONS A AND B Actual Exam 2026/2027 Complete Questions and Verified Answers Graded A Pass Guaranteed - A+ Graded

TEXAS WASTEWATER EXAMINATION VERSIONS A AND B
Actual Exam 2026/2027 Complete Questions and
Verified Answers Graded A Pass Guaranteed - A+
Graded



TEXAS WASTEWATER EXAMINATION VERSIONS A AND B
Actual Exam 2026/2027 Complete Questions and Verified Answers
Graded A | Pass Guaranteed


VERSION A
Section 1: Preliminary and Primary Treatment
Question 1
In wastewater treatment, the primary purpose of a bar screen is to remove:
A. Dissolved solids
B. Large debris and rags
C. Nutrients
D. Bacteria
Correct Answer: B. Large debris and rags
Rationale: Bar screens are preliminary treatment devices designed to remove
large solids such as sticks, rags, plastics, and other debris that could damage
pumps or clog equipment .


Question 2
Which process is primarily responsible for removing settleable solids from
wastewater?

,A. Primary clarification
B. Chlorination
C. Aeration
D. Filtration
Correct Answer: A. Primary clarification
Rationale: Primary clarifiers allow heavy solids to settle by gravity while lighter
materials float to the surface for removal .


Question 3
The purpose of grit chambers is to remove:
A. Oils and grease
B. Sand and heavy particles
C. Dissolved oxygen
D. Bacteria
Correct Answer: B. Sand and heavy particles
Rationale: Grit removal prevents abrasion and accumulation in equipment. Grit
chambers are designed to settle out sand, gravel, and other heavy inorganic
materials .


Question 4
The term "influent" refers to:
A. Treated wastewater leaving the plant
B. Wastewater entering the plant
C. Sludge removed from clarifiers
D. Recycled water
Correct Answer: B. Wastewater entering the plant
Rationale: Influent is the incoming untreated wastewater before any treatment
processes begin .

,Question 5
The removal of oil and grease from wastewater is often done in:
A. Grease traps
B. Aeration tanks
C. Digesters
D. Filters
Correct Answer: A. Grease traps
Rationale: Grease traps separate fats, oils, and grease from wastewater before
they enter the treatment system, preventing clogs and operational problems .


Section 2: Biological Treatment
Question 6
The microorganisms used in the activated sludge process are commonly referred
to as:
A. Floc
B. Sludge cake
C. Mixed liquor
D. BOD
Correct Answer: A. Floc
Rationale: Floc is a cluster of microorganisms, organic matter, and particles that
form during biological treatment. These settleable solids are essential for the
activated sludge process .


Question 7
What does BOD measure in wastewater?
A. Amount of oxygen needed by microorganisms to decompose organic matter
B. Amount of dissolved salts
C. Amount of nitrogen
D. Amount of suspended solids

, Correct Answer: A. Amount of oxygen needed by microorganisms to decompose
organic matter
Rationale: Biochemical Oxygen Demand (BOD) indicates the amount of
biodegradable organic material in wastewater by measuring the oxygen
consumed during decomposition .


Question 8
A clarifier that receives flow after the aeration basin in an activated sludge plant is
called:
A. Primary clarifier
B. Secondary clarifier
C. Sludge thickener
D. Digester
Correct Answer: B. Secondary clarifier
Rationale: Secondary clarifiers settle biological solids produced during aeration,
separating the treated water from the activated sludge .


Question 9
The purpose of return activated sludge (RAS) is to:
A. Remove sludge permanently
B. Return microorganisms to the aeration basin
C. Add chlorine to effluent
D. Filter wastewater
Correct Answer: B. Return microorganisms to the aeration basin
Rationale: RAS returns settled microorganisms to the aeration basin to maintain
the biological population needed for effective treatment .