Excavator Operator Certification Exam Prep · Question
A trench is being excavated adjacent to an existing building, and the excavation requires workers to enter. The trench is 1.5 m deep, 6 m long, and 1.2 m wide. The ground is stable. What is the primary concern for workers entering this trench, even if it's not strictly classified as a 'confined space' by all provincial regulations?
Even if not a formal confined space, trenches can trap heavier-than-air gases or consume oxygen, posing a significant risk of oxygen deficiency, toxic exposure,
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Question: A trench is being excavated adjacent to an existing building, and the excavation requires workers to enter. The trench is 1.5 m deep, 6 m long, and 1.2 m wide. The ground is stable. What is the primary concern for workers entering this trench, even if it's not strictly classified as a 'confined space' by all provincial regulations?
Answer options:
- Risk of electrocution from nearby unseen power lines. ✅ Potential for oxygen deficiency or hazardous gas accumulation.
- Danger of falling tools from the excavation lip.
- High noise levels from adjacent work.
Correct answer: Potential for oxygen deficiency or hazardous gas accumulation.
Explanation: Even if not a formal confined space, trenches can trap heavier-than-air gases or consume oxygen, posing a significant risk of oxygen deficiency, toxic exposure, or asphyxiation. Atmospheric testing is always recommended before entry.
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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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