AK Earthwork & Excavation 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 a site investigation before
beginning excavation work?
a. To determine the paint color of nearby structures
b. To eliminate the need for surveying
c. To identify soil conditions, utilities, groundwater, and other site
hazards
d. To determine the contractor's profit margin
Answer: c. To identify soil conditions, utilities, groundwater, and
other site hazards
Rationale: A thorough site investigation provides essential information
about subsurface conditions and potential hazards. Identifying soil
characteristics, underground utilities, groundwater, existing structures,
,and site access limitations allows the contractor to plan excavation
methods and protective measures appropriately.
2. Which piece of equipment is generally best suited for digging
trenches and foundations?
a. Motor grader
b. Excavator
c. Water truck
d. Vibratory roller
Answer: b. Excavator
Rationale: Excavators are designed for digging, trenching, foundation
excavation, and material handling. Their hydraulic systems and
interchangeable attachments allow them to perform a wide range of
earthwork operations.
3. What does the term “benching” mean in excavation work?
a. Compacting soil in thin layers
b. Cutting the sides of an excavation into a series of horizontal levels
c. Pumping groundwater from a trench
d. Removing topsoil from a site
,Answer: b. Cutting the sides of an excavation into a series of
horizontal levels
Rationale: Benching involves forming horizontal steps in the sides of an
excavation. The configuration is used as a method of protecting workers
from cave-ins when permitted by applicable requirements and suitable
for the soil and excavation conditions.
4. Which soil characteristic is particularly important when evaluating
excavation stability?
a. Color alone
b. Moisture and cohesion
c. Surface temperature only
d. Vegetation height
Answer: b. Moisture and cohesion
Rationale: Soil moisture, cohesion, density, and structure can
significantly affect excavation stability. Changes in moisture can
weaken some soils, while cohesive and granular soils behave differently
under excavation conditions.
, 5. What is the main hazard associated with an unsupported trench
wall?
a. Excessive equipment fuel consumption
b. Cave-in or collapse
c. Low engine horsepower
d. Reduced visibility from sunlight
Answer: b. Cave-in or collapse
Rationale: Unsupported trench walls can suddenly collapse, potentially
trapping or seriously injuring workers. Proper protective systems, safe
access, inspections, and control of surcharge loads are critical
components of trench safety.
6. Before excavating near an underground utility, what should the
contractor do?
a. Assume the utility is abandoned
b. Begin excavation with heavy equipment immediately
c. Have underground utilities located and marked
d. Cover the suspected utility with additional soil
Answer: c. Have underground utilities located and marked
Questions and Correct Answers (Verified
Answers) Plus Rationale 2027 Q&A| Instant
Download Pdf
1. What is the primary purpose of a site investigation before
beginning excavation work?
a. To determine the paint color of nearby structures
b. To eliminate the need for surveying
c. To identify soil conditions, utilities, groundwater, and other site
hazards
d. To determine the contractor's profit margin
Answer: c. To identify soil conditions, utilities, groundwater, and
other site hazards
Rationale: A thorough site investigation provides essential information
about subsurface conditions and potential hazards. Identifying soil
characteristics, underground utilities, groundwater, existing structures,
,and site access limitations allows the contractor to plan excavation
methods and protective measures appropriately.
2. Which piece of equipment is generally best suited for digging
trenches and foundations?
a. Motor grader
b. Excavator
c. Water truck
d. Vibratory roller
Answer: b. Excavator
Rationale: Excavators are designed for digging, trenching, foundation
excavation, and material handling. Their hydraulic systems and
interchangeable attachments allow them to perform a wide range of
earthwork operations.
3. What does the term “benching” mean in excavation work?
a. Compacting soil in thin layers
b. Cutting the sides of an excavation into a series of horizontal levels
c. Pumping groundwater from a trench
d. Removing topsoil from a site
,Answer: b. Cutting the sides of an excavation into a series of
horizontal levels
Rationale: Benching involves forming horizontal steps in the sides of an
excavation. The configuration is used as a method of protecting workers
from cave-ins when permitted by applicable requirements and suitable
for the soil and excavation conditions.
4. Which soil characteristic is particularly important when evaluating
excavation stability?
a. Color alone
b. Moisture and cohesion
c. Surface temperature only
d. Vegetation height
Answer: b. Moisture and cohesion
Rationale: Soil moisture, cohesion, density, and structure can
significantly affect excavation stability. Changes in moisture can
weaken some soils, while cohesive and granular soils behave differently
under excavation conditions.
, 5. What is the main hazard associated with an unsupported trench
wall?
a. Excessive equipment fuel consumption
b. Cave-in or collapse
c. Low engine horsepower
d. Reduced visibility from sunlight
Answer: b. Cave-in or collapse
Rationale: Unsupported trench walls can suddenly collapse, potentially
trapping or seriously injuring workers. Proper protective systems, safe
access, inspections, and control of surcharge loads are critical
components of trench safety.
6. Before excavating near an underground utility, what should the
contractor do?
a. Assume the utility is abandoned
b. Begin excavation with heavy equipment immediately
c. Have underground utilities located and marked
d. Cover the suspected utility with additional soil
Answer: c. Have underground utilities located and marked
