Crane Operator Certification Exam Prep · Question
A crane operator plans a lift where the boom length is 35 meters and the required operating radius is 25 meters. The load chart for 35m boom shows: 24m radius - 9,000 kg; 26m radius - 8,000 kg. What is the maximum gross capacity at 25 meters radius?
To determine the capacity at 25m, linear interpolation is used: The difference in capacity between 24m and 26m is 9,000 kg - 8,000 kg = 1,000 kg over a 2m radiu
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Question: A crane operator plans a lift where the boom length is 35 meters and the required operating radius is 25 meters. The load chart for 35m boom shows: 24m radius - 9,000 kg; 26m radius - 8,000 kg. What is the maximum gross capacity at 25 meters radius?
Answer options: ✅ 8,500 kg
- 9,000 kg
- 8,000 kg
- Cannot be lifted at 25m radius as it's not explicitly on the chart.
Correct answer: 8,500 kg
Explanation: To determine the capacity at 25m, linear interpolation is used: The difference in capacity between 24m and 26m is 9,000 kg - 8,000 kg = 1,000 kg over a 2m radius change. For a 1m increase from 24m to 25m, the capacity decreases by 1,000 kg / 2m = 500 kg/m. So, 9,000 kg - 500 kg = 8,500 kg. This allows for safe interpolation as per CSA Z150.
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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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