Heavy Equipment Operator Certification Exam Prep · Question
An operator is compacting a granular base course with a vibratory smooth drum compactor. The material is approximately 300 mm thick per lift. What vibratory setting is generally most effective for achieving optimal compaction in this scenario?
High amplitude with low frequency is generally used for thicker lifts of granular material to achieve deeper penetration and compaction. Conversely, thin lifts
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Question: An operator is compacting a granular base course with a vibratory smooth drum compactor. The material is approximately 300 mm thick per lift. What vibratory setting is generally most effective for achieving optimal compaction in this scenario?
Answer options: ✅ High amplitude, low frequency
- Low amplitude, high frequency
- Low amplitude, low frequency
- High amplitude, high frequency
Correct answer: High amplitude, low frequency
Explanation: High amplitude with low frequency is generally used for thicker lifts of granular material to achieve deeper penetration and compaction. Conversely, thin lifts or asphalt are typically compacted with high frequency and low amplitude.
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