Excavator Operator Certification Exam Prep · Question
What is 'undermining' in the context of excavation, and why is it dangerous?
Undermining literally means to dig beneath something, removing its foundational support. This is extremely hazardous as it can destabilize structures, slopes, o
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Question: What is 'undermining' in the context of excavation, and why is it dangerous?
Answer options: ✅ Digging beneath an existing structure or slope, removing its support, and potentially causing collapse.
- Digging a trench that is wider at the bottom than at the top.
- Using improper tools for excavation.
- Excavating in wet conditions.
Correct answer: Digging beneath an existing structure or slope, removing its support, and potentially causing collapse.
Explanation: Undermining literally means to dig beneath something, removing its foundational support. This is extremely hazardous as it can destabilize structures, slopes, or adjacent ground, leading to sudden and catastrophic collapse.
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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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