Crane Operator Certification Exam Prep · Question
A 120-tonne mobile crane with an outrigger pad area of 0.8 m x 0.8 m is supporting a maximum load of 30,000 kg at a critical radius. The total operational weight on the most heavily loaded outrigger, including the crane's own weight distribution and load, is calculated to be 180,000 kg. What is the ground bearing pressure exerted by this outrigger in kPa?
Ground bearing pressure (P) = Force (F) / Area (A). Force = 180,000 kg * 9.81 m/s² = 1,765,800 N. Area = 0.8 m * 0.8 m = 0.64 m². Pressure = 1,765,800 N / 0.64
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Question: A 120-tonne mobile crane with an outrigger pad area of 0.8 m x 0.8 m is supporting a maximum load of 30,000 kg at a critical radius. The total operational weight on the most heavily loaded outrigger, including the crane's own weight distribution and load, is calculated to be 180,000 kg. What is the ground bearing pressure exerted by this outrigger in kPa?
Answer options: ✅ 2812.5 kPa
- 2250.0 kPa
- 1716.0 kPa
- 1125.0 kPa
Correct answer: 2812.5 kPa
Explanation: Ground bearing pressure (P) = Force (F) / Area (A). Force = 180,000 kg * 9.81 m/s² = 1,765,800 N. Area = 0.8 m * 0.8 m = 0.64 m². Pressure = 1,765,800 N / 0.64 m² = 2,759,062.5 Pa = 2812.5 kPa (rounded). This calculation is critical for preventing ground failure as per CSA Z150 Clause 5.2.1.
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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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