Excavator Operator Certification Exam Prep · Question
During a loading operation, an excavator operator maintains a consistent swing angle but increases the reach of the boom to load trucks positioned further away. This change results in the excavator becoming less stable. What is the fundamental principle causing this reduction in stability?
Extending the boom increases the load radius, which in turn increases the tipping moment acting on the excavator. A greater tipping moment works against the exc
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Question: During a loading operation, an excavator operator maintains a consistent swing angle but increases the reach of the boom to load trucks positioned further away. This change results in the excavator becoming less stable. What is the fundamental principle causing this reduction in stability?
Answer options:
- Increased counterweight moment.
- Decreased ground bearing pressure. ✅ Increased tipping moment.
- Reduced hydraulic pressure.
Correct answer: Increased tipping moment.
Explanation: Extending the boom increases the load radius, which in turn increases the tipping moment acting on the excavator. A greater tipping moment works against the excavator's stability, making it more prone to tipping. The counterweight moment remains constant, and ground bearing pressure changes, but the primary cause of reduced stability is the increased tipping moment.
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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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