TCEQ Wastewater Collection
System Operator CCTV Inspection
Exam Questions and Correct
Answers with Detailed Rationales |
2026/2027 Edition | PDF
1. What is the primary purpose of closed-circuit television
(CCTV) inspection in a wastewater collection system?
A. To disinfect the sewer
B. To measure wastewater pH
C. To visually assess the internal condition of sewer pipes
D. To increase sewer flow capacity
Answer: C. To visually assess the internal condition of sewer
pipes
Rationale: CCTV inspection provides a visual examination of the
interior of a sewer pipe without requiring continuous excavation.
Operators can identify defects such as cracks, fractures, root
intrusion, corrosion, sediment deposits, joint defects, and
infiltration. The information can then be used to prioritize
maintenance, rehabilitation, or replacement.
2. Before beginning a CCTV inspection, what should an
operator verify first?
,A. That the sewer is completely filled with wastewater
B. That the inspection equipment is operational and properly
configured
C. That all downstream manholes have been permanently sealed
D. That sewer cleaning is prohibited
Answer: B. That the inspection equipment is operational and
properly configured
Rationale: Equipment should be checked before entering the
sewer or beginning the inspection. The camera, lighting, monitor,
recording system, distance counter, crawler, cables, and controls
should function correctly. A pre-inspection equipment check
reduces the likelihood of losing important inspection information
because of equipment failure.
3. Why is sewer cleaning commonly performed before CCTV
inspection?
A. To increase pipe wall thickness
B. To remove obstructions that could hide defects from the
camera
C. To permanently eliminate infiltration
D. To change the pipe's slope
Answer: B. To remove obstructions that could hide defects
from the camera
Rationale: Grease, sediment, roots, debris, and other deposits
can obstruct the camera's view. Cleaning exposes the pipe wall
and allows the operator to identify structural and operational
defects more accurately. Cleaning also helps prevent the camera
from becoming stuck.
,4. Which defect is most directly associated with tree or plant
roots entering a sewer through joints or cracks?
A. Root intrusion
B. Pipe ovality
C. Deflection
D. Joint offset
Answer: A. Root intrusion
Rationale: Root intrusion occurs when plant roots enter a sewer
through cracks, defective joints, service connections, or other
openings. Roots are attracted to moisture and nutrients
associated with wastewater systems. Significant root growth can
restrict flow, trap solids, and eventually cause blockages.
5. During a CCTV inspection, why is the camera's distance
counter important?
A. It measures wastewater temperature
B. It determines pipe pressure
C. It identifies the approximate location of observed defects
D. It determines the pipe's chemical composition
Answer: C. It identifies the approximate location of observed
defects
Rationale: A calibrated distance counter records how far the
camera has traveled from the starting reference point. When a
defect is observed, its distance can be documented. This
information allows maintenance personnel to locate the defect
later for cleaning, repair, excavation, or rehabilitation.
, 6. What is a major limitation of CCTV inspection?
A. It cannot identify any structural defects
B. It provides no visual information
C. It may not reveal defects hidden beneath heavy deposits or
standing water
D. It always requires complete excavation of the sewer
Answer: C. It may not reveal defects hidden beneath heavy
deposits or standing water
Rationale: CCTV inspection depends on visibility. Heavy grease,
sediment, roots, debris, or excessive water can obstruct the
camera's view. Cleaning, flow control, or additional inspection
methods may therefore be necessary to obtain a reliable
assessment.
7. What does a longitudinal crack generally describe in a
sewer pipe?
A. A crack running generally parallel to the pipe's longitudinal axis
B. A crack running around the entire circumference
C. A crack located only inside a manhole
D. A crack caused exclusively by roots
Answer: A. A crack running generally parallel to the pipe's
longitudinal axis
Rationale: A longitudinal crack extends primarily along the length
of the pipe. Its orientation should be documented because crack
characteristics and patterns can provide information about the
type and severity of structural distress.
System Operator CCTV Inspection
Exam Questions and Correct
Answers with Detailed Rationales |
2026/2027 Edition | PDF
1. What is the primary purpose of closed-circuit television
(CCTV) inspection in a wastewater collection system?
A. To disinfect the sewer
B. To measure wastewater pH
C. To visually assess the internal condition of sewer pipes
D. To increase sewer flow capacity
Answer: C. To visually assess the internal condition of sewer
pipes
Rationale: CCTV inspection provides a visual examination of the
interior of a sewer pipe without requiring continuous excavation.
Operators can identify defects such as cracks, fractures, root
intrusion, corrosion, sediment deposits, joint defects, and
infiltration. The information can then be used to prioritize
maintenance, rehabilitation, or replacement.
2. Before beginning a CCTV inspection, what should an
operator verify first?
,A. That the sewer is completely filled with wastewater
B. That the inspection equipment is operational and properly
configured
C. That all downstream manholes have been permanently sealed
D. That sewer cleaning is prohibited
Answer: B. That the inspection equipment is operational and
properly configured
Rationale: Equipment should be checked before entering the
sewer or beginning the inspection. The camera, lighting, monitor,
recording system, distance counter, crawler, cables, and controls
should function correctly. A pre-inspection equipment check
reduces the likelihood of losing important inspection information
because of equipment failure.
3. Why is sewer cleaning commonly performed before CCTV
inspection?
A. To increase pipe wall thickness
B. To remove obstructions that could hide defects from the
camera
C. To permanently eliminate infiltration
D. To change the pipe's slope
Answer: B. To remove obstructions that could hide defects
from the camera
Rationale: Grease, sediment, roots, debris, and other deposits
can obstruct the camera's view. Cleaning exposes the pipe wall
and allows the operator to identify structural and operational
defects more accurately. Cleaning also helps prevent the camera
from becoming stuck.
,4. Which defect is most directly associated with tree or plant
roots entering a sewer through joints or cracks?
A. Root intrusion
B. Pipe ovality
C. Deflection
D. Joint offset
Answer: A. Root intrusion
Rationale: Root intrusion occurs when plant roots enter a sewer
through cracks, defective joints, service connections, or other
openings. Roots are attracted to moisture and nutrients
associated with wastewater systems. Significant root growth can
restrict flow, trap solids, and eventually cause blockages.
5. During a CCTV inspection, why is the camera's distance
counter important?
A. It measures wastewater temperature
B. It determines pipe pressure
C. It identifies the approximate location of observed defects
D. It determines the pipe's chemical composition
Answer: C. It identifies the approximate location of observed
defects
Rationale: A calibrated distance counter records how far the
camera has traveled from the starting reference point. When a
defect is observed, its distance can be documented. This
information allows maintenance personnel to locate the defect
later for cleaning, repair, excavation, or rehabilitation.
, 6. What is a major limitation of CCTV inspection?
A. It cannot identify any structural defects
B. It provides no visual information
C. It may not reveal defects hidden beneath heavy deposits or
standing water
D. It always requires complete excavation of the sewer
Answer: C. It may not reveal defects hidden beneath heavy
deposits or standing water
Rationale: CCTV inspection depends on visibility. Heavy grease,
sediment, roots, debris, or excessive water can obstruct the
camera's view. Cleaning, flow control, or additional inspection
methods may therefore be necessary to obtain a reliable
assessment.
7. What does a longitudinal crack generally describe in a
sewer pipe?
A. A crack running generally parallel to the pipe's longitudinal axis
B. A crack running around the entire circumference
C. A crack located only inside a manhole
D. A crack caused exclusively by roots
Answer: A. A crack running generally parallel to the pipe's
longitudinal axis
Rationale: A longitudinal crack extends primarily along the length
of the pipe. Its orientation should be documented because crack
characteristics and patterns can provide information about the
type and severity of structural distress.
