Excavator Operator Certification Exam Prep · Question
Which of the following is the most effective method for an excavator operator to ensure a trench's side walls remain stable and prevent collapse in granular, unstable soil?
Sloping the trench walls back to a stable angle of repose is the most effective and safest method for preventing collapses in unstable, granular soils. Increasi
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Question: Which of the following is the most effective method for an excavator operator to ensure a trench's side walls remain stable and prevent collapse in granular, unstable soil?
Answer options:
- Increase the digging speed to reduce exposure time. ✅ Slope the trench walls back to a stable angle of repose.
- Compact the trench walls with the excavator bucket.
- Spray water on the trench walls to increase cohesion.
Correct answer: Slope the trench walls back to a stable angle of repose.
Explanation: Sloping the trench walls back to a stable angle of repose is the most effective and safest method for preventing collapses in unstable, granular soils. Increasing digging speed or spraying water are not effective safety measures for stability, and compacting with a bucket is impractical and could even cause instability.
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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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