Excavator Operator Certification Exam Prep · Question
What is the consequence of preparing a subgrade with inadequate crown or cross-slope on a roadway?
Proper crown or cross-slope is essential for pavement drainage. Without it, water will accumulate, saturate the subgrade, and significantly reduce the structura
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Question: What is the consequence of preparing a subgrade with inadequate crown or cross-slope on a roadway?
Answer options:
- Increased pavement life due to less stress. ✅ Poor drainage, leading to water ponding, potential subgrade saturation, and pavement deterioration.
- Improved traction for vehicles during wet weather.
- Reduced construction costs due to less material movement.
Correct answer: Poor drainage, leading to water ponding, potential subgrade saturation, and pavement deterioration.
Explanation: Proper crown or cross-slope is essential for pavement drainage. Without it, water will accumulate, saturate the subgrade, and significantly reduce the structural integrity and lifespan of the pavement.
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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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