Crane Operator Certification Exam Prep · Question
A rigger is using a synthetic round sling to lift a pipe. The pipe has an outer diameter of 400 mm. The round sling being used has a body diameter of 50 mm. What is the D/d ratio in this scenario?
The D/d ratio is calculated by dividing the diameter of the object (D) by the diameter of the sling material (d). In this case, 400 mm / 50 mm = 8. Therefore, t
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Question: A rigger is using a synthetic round sling to lift a pipe. The pipe has an outer diameter of 400 mm. The round sling being used has a body diameter of 50 mm. What is the D/d ratio in this scenario?
Answer options:
- 4:1 ✅ 8:1
- 10:1
- 20:1
Correct answer: 8:1
Explanation: The D/d ratio is calculated by dividing the diameter of the object (D) by the diameter of the sling material (d). In this case, 400 mm / 50 mm = 8. Therefore, the D/d ratio is 8:1.
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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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