Crane Operator Certification Exam Prep · Question
A mobile crane with an outrigger pad reaction force of 500 kN is set up on a soil with an allowable bearing pressure of 150 kPa. What is the minimum required area for each outrigger mat?
Ground bearing pressure (GBP) is calculated as Force/Area. To find the minimum area, rearrange to Area = Force/GBP. So, Area = 500 kN / 150 kPa = 3.33 m².
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Question: A mobile crane with an outrigger pad reaction force of 500 kN is set up on a soil with an allowable bearing pressure of 150 kPa. What is the minimum required area for each outrigger mat?
Answer options: ✅ 3.33 m²
- 0.30 m²
- 7.5 m²
- 5.0 m²
Correct answer: 3.33 m²
Explanation: Ground bearing pressure (GBP) is calculated as Force/Area. To find the minimum area, rearrange to Area = Force/GBP. So, Area = 500 kN / 150 kPa = 3.33 m².
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- 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
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