Heavy Equipment Operator Certification Exam Prep · Question
What is the typical difference between 'struck capacity' and 'heaped capacity' for an excavator bucket?
Struck capacity is the volume of material contained within the bucket if it were levelled off at the top of its sides. Heaped capacity includes the additional m
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Question: What is the typical difference between 'struck capacity' and 'heaped capacity' for an excavator bucket?
Answer options:
- Struck capacity includes the material above the bucket's rim, while heaped capacity does not. ✅ Heaped capacity includes the material above the bucket's rim, while struck capacity measures to the top of the sides.
- Struck capacity is for loose material, and heaped capacity is for compacted material.
- Heaped capacity is always smaller than struck capacity due to compaction during loading.
Correct answer: Heaped capacity includes the material above the bucket's rim, while struck capacity measures to the top of the sides.
Explanation: Struck capacity is the volume of material contained within the bucket if it were levelled off at the top of its sides. Heaped capacity includes the additional material that forms a pile (heap) above the bucket's sides, accounting for the angle of repose.
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