Crane Operator Certification Exam Prep · Question
Two cranes are lifting a 40-tonne structure using four-leg slings. The angle of the sling legs to the vertical is 30 degrees. What is the approximate tension in each sling leg if the load is evenly distributed?
For a four-leg sling with even distribution, each leg carries 1/4 of the load (10 tonnes). The tension (T) in each leg is T = (Load per leg) / cos(angle to vert
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Question: Two cranes are lifting a 40-tonne structure using four-leg slings. The angle of the sling legs to the vertical is 30 degrees. What is the approximate tension in each sling leg if the load is evenly distributed?
Answer options:
- 10.0 tonnes ✅ 11.5 tonnes
- 13.3 tonnes
- 8.7 tonnes
Correct answer: 11.5 tonnes
Explanation:
For a four-leg sling with even distribution, each leg carries 1/4 of the load (10 tonnes). The tension (T) in each leg is T = (Load per leg) / cos(angle to vertical). So, T = 10 tonnes / cos(30°) = 10 tonnes / 0.866 ≈ 11.5 tonnes. This calculation is fundamental in rigging for safe working loads.
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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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