Crane Operator Certification Exam Prep · Question
When assessing the ground conditions for outrigger placement, what characteristic poses the greatest risk for sudden structural failure?
Uncompacted backfill or areas with unknown voids mask the true bearing capacity of the ground. These conditions can lead to sudden, localized settlement under t
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Question: When assessing the ground conditions for outrigger placement, what characteristic poses the greatest risk for sudden structural failure?
Answer options:
- Frozen soil less than 15 cm (6 in) deep.
- Slightly uneven asphalt with minor cracks. ✅ Areas filled with uncompacted backfill or unknown voids.
- Hard-packed gravel with a visible slope.
Correct answer: Areas filled with uncompacted backfill or unknown voids.
Explanation: Uncompacted backfill or areas with unknown voids mask the true bearing capacity of the ground. These conditions can lead to sudden, localized settlement under the outrigger, causing instability and potential overturn.
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Question explanations
- According to most Canadian provincial regulations, who is ultimately responsible for the safe operation of a c
- A crane's rated capacity decreases as the load radius:
- What is the minimum number of full wraps of wire rope that must remain on a hoist drum when the hook is in its
- Before setting up a mobile crane, what is the most important factor to assess regarding ground conditions?
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