Excavator Operator Certification Exam Prep · Question
You are trenching in cohesive soil with a trench depth of 3.5 metres and a bottom width of 0.8 metres. The soil type requires a minimum slope of 1:1 for stability. What is the minimum required top width of the trench?
For a 1:1 slope, the horizontal distance equals the vertical distance on both sides. So, 3.5 m (depth) x 1 (slope ratio) = 3.5 m on each side. Total top width i
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Question: You are trenching in cohesive soil with a trench depth of 3.5 metres and a bottom width of 0.8 metres. The soil type requires a minimum slope of 1:1 for stability. What is the minimum required top width of the trench?
Answer options:
- 4.3 metres ✅ 7.8 metres
- 5.0 metres
- 3.0 metres
Correct answer: 7.8 metres
Explanation: For a 1:1 slope, the horizontal distance equals the vertical distance on both sides. So, 3.5 m (depth) x 1 (slope ratio) = 3.5 m on each side. Total top width is 0.8 m (bottom width) + 3.5 m (left slope) + 3.5 m (right slope) = 7.8 metres. This calculation ensures the trench walls are stable per OHS regulations.
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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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