Crane Operator Certification Exam Prep · Question
A rigger is using a wire rope sling that has a rated capacity of 10,000 kg in a straight pull. If this sling is bent around a sharp edge with a D/d ratio of 1, where D is the diameter of the object around which the sling is bent and d is the diameter of the wire rope, what is the approximate derated capacity?
When a wire rope sling is bent around a sharp corner or an object with a D/d ratio of 1, its capacity is derated by approximately 50%. This is due to the severe
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Question: A rigger is using a wire rope sling that has a rated capacity of 10,000 kg in a straight pull. If this sling is bent around a sharp edge with a D/d ratio of 1, where D is the diameter of the object around which the sling is bent and d is the diameter of the wire rope, what is the approximate derated capacity?
Answer options: ✅ 5,000 kg
- 6,000 kg
- 8,000 kg
- 10,000 kg
Correct answer: 5,000 kg
Explanation: When a wire rope sling is bent around a sharp corner or an object with a D/d ratio of 1, its capacity is derated by approximately 50%. This is due to the severe localized stress and bending fatigue induced in the wires. So, 10,000 kg * 0.5 = 5,000 kg. Distractor B is incorrect as a D/d ratio of 2 or 3 typically results in a 40% reduction, not 50%.
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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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