Excavator Operator Certification Exam Prep · Question
When grading a site for a building's footprint, why is it critical to ensure proper compaction of the subgrade before placing foundation materials?
Proper subgrade compaction eliminates voids and increases the soil's bearing capacity, preventing future settlement under the weight of the building. Uncontroll
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Question: When grading a site for a building's footprint, why is it critical to ensure proper compaction of the subgrade before placing foundation materials?
Answer options:
- To make the digging of future utility trenches easier. ✅ To prevent future settlement of the building, which can lead to structural damage.
- To reduce the amount of concrete needed for the foundation.
- To improve the aesthetic appearance of the soil beneath the structure.
Correct answer: To prevent future settlement of the building, which can lead to structural damage.
Explanation: Proper subgrade compaction eliminates voids and increases the soil's bearing capacity, preventing future settlement under the weight of the building. Uncontrolled settlement can cause severe structural damage.
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Question explanations
- During a final inspection of an excavator, prior to beginning work, an operator notices significant play in th
- An excavator operator is preparing to dig a trench in cohesive soil. To achieve maximum breakout force, what a
- Which control typically governs the arm (or dipper arm) movement for an excavator?
- What condition might require sloping or shoring of a trench less than 1.2 meters (4 feet) deep?
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