Excavator Operator Certification Exam Prep · Question
A trench is 3 meters deep, 1.5 meters wide, and 10 meters long. Groundwater is observed seeping into the trench at a rate of 0.2 litres per second. If excavation stops for 30 minutes, how much water will accumulate in the trench?
Water accumulation: Flow rate (0.2 L/s) × Time (30 minutes × 60 seconds/minute) = 0.2 L/s × 1800 s = 360 litres. This amount of water can quickly create hazardo
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Question: A trench is 3 meters deep, 1.5 meters wide, and 10 meters long. Groundwater is observed seeping into the trench at a rate of 0.2 litres per second. If excavation stops for 30 minutes, how much water will accumulate in the trench?
Answer options:
- 60 litres
- 120 litres ✅ 360 litres
- 720 litres
Correct answer: 360 litres
Explanation: Water accumulation: Flow rate (0.2 L/s) × Time (30 minutes × 60 seconds/minute) = 0.2 L/s × 1800 s = 360 litres. This amount of water can quickly create hazardous working conditions.
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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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