Heavy Equipment Operator Certification Exam Prep · Question
What is the primary reason material changes from a 'bank' state to a 'loose' state during excavation?
When material is excavated from its natural 'bank' state, disturbance and the introduction of air voids cause it to fluff up and occupy a larger volume, becomin
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Question: What is the primary reason material changes from a 'bank' state to a 'loose' state during excavation?
Answer options:
- Increase in material density
- Decrease in moisture content ✅ Introduction of air voids and disturbance
- Chemical reaction within the soil structure
Correct answer: Introduction of air voids and disturbance
Explanation: When material is excavated from its natural 'bank' state, disturbance and the introduction of air voids cause it to fluff up and occupy a larger volume, becoming 'loose' material. This is a fundamental concept in earthmoving volumetrics.
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