Excavator Operator Certification Exam Prep · Question
What is the primary function of performing a 'key trench' when preparing to backfill a sloped area?
A key trench, typically dug at the toe of a slope, provides a stable, anchored base for the fill material, preventing it from sliding downhill. This is crucial
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Question: What is the primary function of performing a 'key trench' when preparing to backfill a sloped area?
Answer options: ✅ To provide a stable base for the fill material and prevent slippage
- To allow for better compaction of the backfill material
- To expose buried utilities for inspection before backfilling
- To collect surface water runoff before it reaches the sloped area
Correct answer: To provide a stable base for the fill material and prevent slippage
Explanation: A key trench, typically dug at the toe of a slope, provides a stable, anchored base for the fill material, preventing it from sliding downhill. This is crucial for maintaining the integrity and stability of the engineered slope over time. It is not primarily for compaction, utility exposure, or water collection.
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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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