Crane Operator Certification Exam Prep · Question
A crane operator is setting up to lift a 3000 kg machine. They choose a synthetic sling with a Rated Capacity (RC) of 4000 kg in a vertical hitch. If they decide to use a choker hitch instead, what is the approximate maximum load the sling can safely lift, considering a typical choker hitch derating factor of 20%?
With a typical 20% derating for a choker hitch, the sling's capacity is 80% of its vertical RC. So, 4000 kg * 0.80 = 3200 kg. The original load of 3000 kg is wi
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Question: A crane operator is setting up to lift a 3000 kg machine. They choose a synthetic sling with a Rated Capacity (RC) of 4000 kg in a vertical hitch. If they decide to use a choker hitch instead, what is the approximate maximum load the sling can safely lift, considering a typical choker hitch derating factor of 20%?
Answer options: ✅ 3200 kg
- 4000 kg
- 2400 kg
- 3000 kg
Correct answer: 3200 kg
Explanation: With a typical 20% derating for a choker hitch, the sling's capacity is 80% of its vertical RC. So, 4000 kg * 0.80 = 3200 kg. The original load of 3000 kg is within this derated capacity. Answering 2400 kg incorrectly applies the derating as a reduction from the load, not the sling's capacity.
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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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