Excavator Operator Certification Exam Prep · Question
A granular pipe bedding material needs to be compacted to 95% Standard Proctor Density. The specified lift thickness for this material is 150 mm. If the pipe invert is 2 metres below existing grade, and 300 mm of bedding is required below the pipe, how many lifts of bedding material are needed?
If 300 mm of bedding is required below pipe, and each lift is 150 mm, then 300 mm / 150 mm/lift = 2 lifts are needed. The pipe invert depth simplifies to the re
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Question: A granular pipe bedding material needs to be compacted to 95% Standard Proctor Density. The specified lift thickness for this material is 150 mm. If the pipe invert is 2 metres below existing grade, and 300 mm of bedding is required below the pipe, how many lifts of bedding material are needed?
Answer options: ✅ 2 lifts
- 3 lifts
- 1 lift
- 4 lifts
Correct answer: 2 lifts
Explanation: If 300 mm of bedding is required below pipe, and each lift is 150 mm, then 300 mm / 150 mm/lift = 2 lifts are needed. The pipe invert depth simplifies to the required bedding depth.
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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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