Crane Operator Certification Exam Prep · Question
A new rigging procedure specifies using a 38 mm diameter wire rope sling over a custom lifting beam with a 150 mm diameter saddle. What is the approximate percentage of the sling's original strength that is retained for this specific D/d ratio, based on typical wire rope strength curves?
The D/d ratio is 150 mm / 38 mm = 3.95. According to typical wire rope strength retention charts (based on ASME B30.5 principles and relevant to CSA Z150 riggin
Start free practice for Crane Operator Certification Exam Prep
404 questions · no signup required · 40 free questions per day
Question: A new rigging procedure specifies using a 38 mm diameter wire rope sling over a custom lifting beam with a 150 mm diameter saddle. What is the approximate percentage of the sling's original strength that is retained for this specific D/d ratio, based on typical wire rope strength curves?
Answer options:
- Approximately 50%
- Approximately 75% ✅ Approximately 87%
- Approximately 95%
Correct answer: Approximately 87%
Explanation: The D/d ratio is 150 mm / 38 mm = 3.95. According to typical wire rope strength retention charts (based on ASME B30.5 principles and relevant to CSA Z150 rigging practices), a D/d ratio of 4:1 results in approximately 87% strength retention. This bending can significantly reduce sling capacity.
Start free practice for Crane Operator Certification Exam Prep
404 questions · no signup required · 40 free questions per day
More about Crane Operator Certification Exam Prep
Related Questions
- 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?
- What is the purpose of an anti-two-block device on a crane?
- Why is it important to keep the load as close to the ground as possible when moving it with a crane?
More for Crane Operator Certification Exam Prep candidates
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?
Ready to practice?
Free, no signup required. Build a wrong-question list as you go.
Start Free Crane Operator Certification Exam Prep Practice →Related courses
Other Canadian certifications candidates often prepare for alongside this one.