AR UT Underground Utilities Contractor Exam
Questions and Correct Answers (Verified
Answers) Plus Rationale 2027 Q&A| Instant
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Question 1
Before beginning excavation for an underground utility installation in
Arkansas, what should the contractor do first?
A. Begin digging at the shallowest point of the trench.
B. Contact the appropriate utility notification service and have
existing underground facilities located.
C. Remove all surface vegetation from the work area.
D. Install the utility pipe before reviewing the plans.
Rationale: Existing underground utilities must be identified and marked
before excavation begins. Contacting the appropriate utility notification
service helps prevent damage to buried electrical, gas, water,
,telecommunications, and other facilities. The contractor must also
review project plans, respect required notification periods, and verify
markings before digging.
Question 2
What is the primary purpose of a trench box during underground utility
construction?
A. To support the weight of the excavator.
B. To prevent groundwater from entering the trench.
C. To protect workers from cave-ins by providing a protective
enclosure.
D. To eliminate the need for inspecting the excavation.
Rationale: A trench box, also called a trench shield, protects workers
inside the excavation if the surrounding soil collapses. It does not
necessarily prevent a cave-in or support the trench walls. Workers must
remain within the protected area, and the excavation must still be
inspected by a competent person.
Question 3
Which soil condition generally presents the greatest risk of trench-wall
collapse?
,A. Dense, undisturbed cohesive soil with stable conditions.
B. Competent rock that has been properly evaluated.
C. Dry, compacted soil with no visible signs of instability.
D. Loose, saturated soil with signs of cracking or sloughing.
Rationale: Loose and saturated soil can lose strength and fail suddenly,
especially when water increases pore pressure or destabilizes the trench
walls. Cracks, sloughing, bulging, and water seepage are warning signs
of possible collapse. Soil conditions must be evaluated before selecting
an appropriate protective system.
Question 4
What is the principal function of bedding material beneath an
underground utility pipe?
A. To increase the pipe's internal water pressure.
B. To provide uniform support and help prevent concentrated loads
on the pipe.
C. To eliminate the need for proper pipe alignment.
D. To replace the need for trench backfill.
Rationale: Proper bedding supports the pipe continuously along its
barrel and helps prevent point loads, excessive deformation, and
, settlement. Bedding material must meet project specifications and be
placed and shaped appropriately. Proper bedding is particularly
important for flexible pipes, which rely on soil support to carry external
loads.
Question 5
A contractor discovers an unmarked underground electrical cable
during excavation. What should happen next?
A. Continue excavation carefully with the mechanical excavator.
B. Move the cable aside without contacting the utility owner.
C. Stop work in the affected area, keep personnel clear, and contact
the appropriate utility owner or emergency service as necessary.
D. Cover the cable and continue installing the pipe.
Rationale: An unmarked electrical cable may be energized and can
cause severe injury, fire, or death if disturbed. Work must stop in the
affected area, and workers must avoid touching the cable or equipment
that may be energized. The utility owner should determine how the
cable can be safely identified, isolated, or protected before work
resumes.
Question 6
Questions and Correct Answers (Verified
Answers) Plus Rationale 2027 Q&A| Instant
Download Pdf
Question 1
Before beginning excavation for an underground utility installation in
Arkansas, what should the contractor do first?
A. Begin digging at the shallowest point of the trench.
B. Contact the appropriate utility notification service and have
existing underground facilities located.
C. Remove all surface vegetation from the work area.
D. Install the utility pipe before reviewing the plans.
Rationale: Existing underground utilities must be identified and marked
before excavation begins. Contacting the appropriate utility notification
service helps prevent damage to buried electrical, gas, water,
,telecommunications, and other facilities. The contractor must also
review project plans, respect required notification periods, and verify
markings before digging.
Question 2
What is the primary purpose of a trench box during underground utility
construction?
A. To support the weight of the excavator.
B. To prevent groundwater from entering the trench.
C. To protect workers from cave-ins by providing a protective
enclosure.
D. To eliminate the need for inspecting the excavation.
Rationale: A trench box, also called a trench shield, protects workers
inside the excavation if the surrounding soil collapses. It does not
necessarily prevent a cave-in or support the trench walls. Workers must
remain within the protected area, and the excavation must still be
inspected by a competent person.
Question 3
Which soil condition generally presents the greatest risk of trench-wall
collapse?
,A. Dense, undisturbed cohesive soil with stable conditions.
B. Competent rock that has been properly evaluated.
C. Dry, compacted soil with no visible signs of instability.
D. Loose, saturated soil with signs of cracking or sloughing.
Rationale: Loose and saturated soil can lose strength and fail suddenly,
especially when water increases pore pressure or destabilizes the trench
walls. Cracks, sloughing, bulging, and water seepage are warning signs
of possible collapse. Soil conditions must be evaluated before selecting
an appropriate protective system.
Question 4
What is the principal function of bedding material beneath an
underground utility pipe?
A. To increase the pipe's internal water pressure.
B. To provide uniform support and help prevent concentrated loads
on the pipe.
C. To eliminate the need for proper pipe alignment.
D. To replace the need for trench backfill.
Rationale: Proper bedding supports the pipe continuously along its
barrel and helps prevent point loads, excessive deformation, and
, settlement. Bedding material must meet project specifications and be
placed and shaped appropriately. Proper bedding is particularly
important for flexible pipes, which rely on soil support to carry external
loads.
Question 5
A contractor discovers an unmarked underground electrical cable
during excavation. What should happen next?
A. Continue excavation carefully with the mechanical excavator.
B. Move the cable aside without contacting the utility owner.
C. Stop work in the affected area, keep personnel clear, and contact
the appropriate utility owner or emergency service as necessary.
D. Cover the cable and continue installing the pipe.
Rationale: An unmarked electrical cable may be energized and can
cause severe injury, fire, or death if disturbed. Work must stop in the
affected area, and workers must avoid touching the cable or equipment
that may be energized. The utility owner should determine how the
cable can be safely identified, isolated, or protected before work
resumes.
Question 6
