Excavator Operator Certification Exam Prep · Question
A trench is being backfilled with granular material that requires compaction every 300 mm lift. The trench is 3.0 metres deep. How many compaction passes are required for the full depth of backfill?
To calculate the number of compaction passes, divide the total depth by the lift thickness: 3.0 metres / 0.300 metres = 10 layers. Therefore, 10 compaction pass
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Question: A trench is being backfilled with granular material that requires compaction every 300 mm lift. The trench is 3.0 metres deep. How many compaction passes are required for the full depth of backfill?
Answer options: ✅ 10 passes
- 9 passes
- 11 passes
- 12 passes
Correct answer: 10 passes
Explanation: To calculate the number of compaction passes, divide the total depth by the lift thickness: 3.0 metres / 0.300 metres = 10 layers. Therefore, 10 compaction passes are required for the full depth.
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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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