Crane Operator Certification Exam Prep · Question
What is the primary purpose of ensuring dunnage (outrigger mats) are substantially larger than the outrigger pads and properly placed?
Dunnage acts to spread the concentrated high pressure from the outrigger pads over a larger area, reducing the ground bearing pressure and preventing the outrig
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Question: What is the primary purpose of ensuring dunnage (outrigger mats) are substantially larger than the outrigger pads and properly placed?
Answer options:
- To easily locate the outrigger pads after retraction. ✅ To increase the surface area and distribute the pressure onto the ground.
- To protect the outrigger pads from wear and tear.
- To provide a visual indicator of the crane's stability zone.
Correct answer: To increase the surface area and distribute the pressure onto the ground.
Explanation: Dunnage acts to spread the concentrated high pressure from the outrigger pads over a larger area, reducing the ground bearing pressure and preventing the outriggers from sinking into softer ground, which maintains stability (CSA Z150, Section 5.3.1.2).
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- 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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