Crane Operator Certification Exam Prep · Question
A rigging crew is using a sling with a WLL of 2,000 kg (vertical). If this sling is used in a choker hitch, what is the typical derating factor applied for calculating the effective WLL?
For a choker hitch, a common industry practice is to apply a derating factor of 0.8 to the vertical WLL, meaning the effective WLL is 80% of its rated capacity.
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Question: A rigging crew is using a sling with a WLL of 2,000 kg (vertical). If this sling is used in a choker hitch, what is the typical derating factor applied for calculating the effective WLL?
Answer options: ✅ 0.8
- 0.75
- 0.7
- 0.6
Correct answer: 0.8
Explanation: For a choker hitch, a common industry practice is to apply a derating factor of 0.8 to the vertical WLL, meaning the effective WLL is 80% of its rated capacity. A factor of 0.75 or 0.7 is sometimes used for specific sling types or angles, but 0.8 is standard for general choker use.
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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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