Crane Operator Certification Exam Prep · Question
A rigger is planning to lift a steel beam using a synthetic web sling in a choker hitch. The beam's diameter is 300 mm. What is the minimum recommended D/d ratio for this sling application, and what does 'd' represent?
For synthetic web slings used in a choker hitch, ASME B30.9 and similar guidance (adapted in practice) recommend a minimum D/d ratio of at least 5:1, where 'd'
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Question: A rigger is planning to lift a steel beam using a synthetic web sling in a choker hitch. The beam's diameter is 300 mm. What is the minimum recommended D/d ratio for this sling application, and what does 'd' represent?
Answer options:
- 1:1, 'd' is the sling width ✅ 5:1, 'd' is the sling width
- 2:1, 'd' is the sling thickness
- 1:1, 'd' is the sling thickness
Correct answer: 5:1, 'd' is the sling width
Explanation: For synthetic web slings used in a choker hitch, ASME B30.9 and similar guidance (adapted in practice) recommend a minimum D/d ratio of at least 5:1, where 'd' refers to the width of the sling to prevent excessive compressive forces and strength loss.
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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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