AZ L-86 Pipeline Rehabilitation Contractor
Exam Questions and Correct Answers (Verified
Answers) Plus Rationale 2027 Q&A| Instant
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1. What is the primary purpose of pipeline rehabilitation?
a. To eliminate all future maintenance
b. To restore or improve the pipeline’s structural and hydraulic
performance
c. To increase excavation quantities
d. To replace every pipeline with a larger diameter
Answer: b. To restore or improve the pipeline’s structural and
hydraulic performance
Rationale: Pipeline rehabilitation is intended to extend service life,
restore capacity, improve structural integrity, reduce leakage or
infiltration, and address other deficiencies. Rehabilitation does not
necessarily mean complete replacement of the existing pipeline.
, 2. Before beginning rehabilitation work on an existing pipeline, what
should be established first?
a. The final landscaping design
b. The location, condition, and characteristics of the existing pipeline
c. The color of replacement materials
d. The final project profit
Answer: b. The location, condition, and characteristics of the existing
pipeline
Rationale: Existing-pipeline information is fundamental to selecting
an appropriate rehabilitation method. Contractors need to
understand pipe material, diameter, alignment, depth, condition,
connections, flow conditions, and surrounding utilities before work
begins.
3. Which inspection method is commonly used to evaluate the
interior condition of gravity sewer pipelines?
a. CCTV inspection
b. Soil compaction testing only
c. Concrete slump testing
d. Welding radiography
Answer: a. CCTV inspection
,Rationale: Closed-circuit television inspection provides a visual
assessment of the inside of a pipeline. It can identify cracks, fractures,
root intrusion, deposits, deformation, infiltration, displaced joints, and
other defects.
4. Why is pre-rehabilitation cleaning important?
a. It permanently strengthens the host pipe
b. It removes debris and deposits that could interfere with inspection or
rehabilitation
c. It eliminates the need for inspection
d. It changes the pipeline alignment
Answer: b. It removes debris and deposits that could interfere with
inspection or rehabilitation
Rationale: Cleaning exposes the pipe surface and removes materials
that could obstruct equipment or interfere with lining adhesion,
installation, or curing. It also helps produce a more accurate
assessment of existing conditions.
5. What is a major advantage of trenchless pipeline rehabilitation?
a. It always eliminates traffic control
b. It can reduce the need for continuous surface excavation
, c. It requires complete removal of the existing pipe
d. It guarantees that utility conflicts cannot occur
Answer: b. It can reduce the need for continuous surface excavation
Rationale: Trenchless rehabilitation is performed primarily through
existing access points or limited excavations. This can reduce surface
disruption, restoration requirements, traffic impacts, and interference
with nearby infrastructure.
6. In cured-in-place pipe rehabilitation, what is the liner typically
impregnated with before installation?
a. Hydraulic cement only
b. Resin
c. Asphalt pavement
d. Bentonite clay only
Answer: b. Resin
Rationale: A CIPP liner is saturated with a thermosetting resin before
being positioned inside the host pipe. The resin is subsequently cured
using an appropriate curing system to form a new pipe within the
existing pipe.
7. What does CIPP stand for?
Exam Questions and Correct Answers (Verified
Answers) Plus Rationale 2027 Q&A| Instant
Download Pdf
1. What is the primary purpose of pipeline rehabilitation?
a. To eliminate all future maintenance
b. To restore or improve the pipeline’s structural and hydraulic
performance
c. To increase excavation quantities
d. To replace every pipeline with a larger diameter
Answer: b. To restore or improve the pipeline’s structural and
hydraulic performance
Rationale: Pipeline rehabilitation is intended to extend service life,
restore capacity, improve structural integrity, reduce leakage or
infiltration, and address other deficiencies. Rehabilitation does not
necessarily mean complete replacement of the existing pipeline.
, 2. Before beginning rehabilitation work on an existing pipeline, what
should be established first?
a. The final landscaping design
b. The location, condition, and characteristics of the existing pipeline
c. The color of replacement materials
d. The final project profit
Answer: b. The location, condition, and characteristics of the existing
pipeline
Rationale: Existing-pipeline information is fundamental to selecting
an appropriate rehabilitation method. Contractors need to
understand pipe material, diameter, alignment, depth, condition,
connections, flow conditions, and surrounding utilities before work
begins.
3. Which inspection method is commonly used to evaluate the
interior condition of gravity sewer pipelines?
a. CCTV inspection
b. Soil compaction testing only
c. Concrete slump testing
d. Welding radiography
Answer: a. CCTV inspection
,Rationale: Closed-circuit television inspection provides a visual
assessment of the inside of a pipeline. It can identify cracks, fractures,
root intrusion, deposits, deformation, infiltration, displaced joints, and
other defects.
4. Why is pre-rehabilitation cleaning important?
a. It permanently strengthens the host pipe
b. It removes debris and deposits that could interfere with inspection or
rehabilitation
c. It eliminates the need for inspection
d. It changes the pipeline alignment
Answer: b. It removes debris and deposits that could interfere with
inspection or rehabilitation
Rationale: Cleaning exposes the pipe surface and removes materials
that could obstruct equipment or interfere with lining adhesion,
installation, or curing. It also helps produce a more accurate
assessment of existing conditions.
5. What is a major advantage of trenchless pipeline rehabilitation?
a. It always eliminates traffic control
b. It can reduce the need for continuous surface excavation
, c. It requires complete removal of the existing pipe
d. It guarantees that utility conflicts cannot occur
Answer: b. It can reduce the need for continuous surface excavation
Rationale: Trenchless rehabilitation is performed primarily through
existing access points or limited excavations. This can reduce surface
disruption, restoration requirements, traffic impacts, and interference
with nearby infrastructure.
6. In cured-in-place pipe rehabilitation, what is the liner typically
impregnated with before installation?
a. Hydraulic cement only
b. Resin
c. Asphalt pavement
d. Bentonite clay only
Answer: b. Resin
Rationale: A CIPP liner is saturated with a thermosetting resin before
being positioned inside the host pipe. The resin is subsequently cured
using an appropriate curing system to form a new pipe within the
existing pipe.
7. What does CIPP stand for?
