AZ L-86 Pipeline Rehabilitation
Contractor Exam Practice Questions
And Correct Answers (Verified Answers)
Plus Rationales 2027 Q&A | Instant
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1. What is the primary objective of pipeline rehabilitation?
A. Replace every existing pipeline
B. Restore or improve pipeline service life and performance
C. Increase excavation quantities
D. Eliminate all maintenance activities
Answer: B. Restore or improve pipeline service life and performance
Rationale: Pipeline rehabilitation is intended to restore structural integrity,
hydraulic performance, and serviceability while extending the useful life of
an existing pipeline.
, 2. Which rehabilitation method installs a new liner inside an existing host
pipe and cures it in place?
A. Open-cut replacement
B. Cured-in-place pipe (CIPP)
C. Pipe jacking
D. Soil stabilization
Answer: B. Cured-in-place pipe (CIPP)
Rationale: CIPP uses a resin-impregnated liner that is inserted into the
existing pipe and cured using heat, steam, water, or ultraviolet light,
depending on the system.
3. What is a major advantage of trenchless rehabilitation?
A. It always eliminates all surface disruption
B. It can reduce excavation and restoration requirements
C. It requires no inspection
D. It eliminates the need for testing
Answer: B. It can reduce excavation and restoration requirements
Rationale: Trenchless methods can substantially reduce excavation, traffic
disruption, surface restoration, and impacts to surrounding infrastructure.
, 4. Before selecting a rehabilitation method, what should generally be
determined first?
A. Paint color of the pipe
B. Existing pipe condition and project requirements
C. Contractor's preferred equipment
D. Weather forecast only
Answer: B. Existing pipe condition and project requirements
Rationale: The existing pipe's material, diameter, defects, structural
condition, hydraulic requirements, access, groundwater, and service
conditions influence method selection.
5. What inspection method is commonly used to examine the interior of
sanitary sewer pipelines?
A. CCTV inspection
B. Soil density testing
C. Concrete slump testing
D. Weld radiography only
Answer: A. CCTV inspection
Rationale: Closed-circuit television inspection provides a visual record of
cracks, roots, deposits, deformation, infiltration, joints, and other internal
defects.
, 6. What is a primary purpose of pre-rehabilitation CCTV inspection?
A. Determine the pipe's paint color
B. Identify defects and verify rehabilitation requirements
C. Determine crew payroll
D. Replace pressure testing
Answer: B. Identify defects and verify rehabilitation requirements
Rationale: Pre-rehabilitation inspection establishes existing conditions and
helps determine whether cleaning, repair, lining, replacement, or another
method is appropriate.
7. What should be done if a host pipe contains heavy sediment before
lining?
A. Install the liner through the sediment
B. Clean the pipe adequately before lining
C. Add more resin
D. Increase traffic around the work zone
Answer: B. Clean the pipe adequately before lining
Rationale: Excess sediment can obstruct installation, interfere with liner
placement, reduce contact with the host pipe, and compromise the finished
rehabilitation.
Contractor Exam Practice Questions
And Correct Answers (Verified Answers)
Plus Rationales 2027 Q&A | Instant
Download Pdf
1. What is the primary objective of pipeline rehabilitation?
A. Replace every existing pipeline
B. Restore or improve pipeline service life and performance
C. Increase excavation quantities
D. Eliminate all maintenance activities
Answer: B. Restore or improve pipeline service life and performance
Rationale: Pipeline rehabilitation is intended to restore structural integrity,
hydraulic performance, and serviceability while extending the useful life of
an existing pipeline.
, 2. Which rehabilitation method installs a new liner inside an existing host
pipe and cures it in place?
A. Open-cut replacement
B. Cured-in-place pipe (CIPP)
C. Pipe jacking
D. Soil stabilization
Answer: B. Cured-in-place pipe (CIPP)
Rationale: CIPP uses a resin-impregnated liner that is inserted into the
existing pipe and cured using heat, steam, water, or ultraviolet light,
depending on the system.
3. What is a major advantage of trenchless rehabilitation?
A. It always eliminates all surface disruption
B. It can reduce excavation and restoration requirements
C. It requires no inspection
D. It eliminates the need for testing
Answer: B. It can reduce excavation and restoration requirements
Rationale: Trenchless methods can substantially reduce excavation, traffic
disruption, surface restoration, and impacts to surrounding infrastructure.
, 4. Before selecting a rehabilitation method, what should generally be
determined first?
A. Paint color of the pipe
B. Existing pipe condition and project requirements
C. Contractor's preferred equipment
D. Weather forecast only
Answer: B. Existing pipe condition and project requirements
Rationale: The existing pipe's material, diameter, defects, structural
condition, hydraulic requirements, access, groundwater, and service
conditions influence method selection.
5. What inspection method is commonly used to examine the interior of
sanitary sewer pipelines?
A. CCTV inspection
B. Soil density testing
C. Concrete slump testing
D. Weld radiography only
Answer: A. CCTV inspection
Rationale: Closed-circuit television inspection provides a visual record of
cracks, roots, deposits, deformation, infiltration, joints, and other internal
defects.
, 6. What is a primary purpose of pre-rehabilitation CCTV inspection?
A. Determine the pipe's paint color
B. Identify defects and verify rehabilitation requirements
C. Determine crew payroll
D. Replace pressure testing
Answer: B. Identify defects and verify rehabilitation requirements
Rationale: Pre-rehabilitation inspection establishes existing conditions and
helps determine whether cleaning, repair, lining, replacement, or another
method is appropriate.
7. What should be done if a host pipe contains heavy sediment before
lining?
A. Install the liner through the sediment
B. Clean the pipe adequately before lining
C. Add more resin
D. Increase traffic around the work zone
Answer: B. Clean the pipe adequately before lining
Rationale: Excess sediment can obstruct installation, interfere with liner
placement, reduce contact with the host pipe, and compromise the finished
rehabilitation.
