Crane Operator Certification Exam Prep · Question
A mobile crane's load chart displays three outrigger configurations: 100% Extended, 70% Extended, and On Tires. The operator is setting up in a confined space where the outriggers can only be extended to 65% of their full spread. Which chart should be used to determine the crane's capacity?
According to CSA Z150, when outriggers are set up in a configuration less than specified on the chart (e.g., 65% when only 70% and 100% are provided), the opera
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Question: A mobile crane's load chart displays three outrigger configurations: 100% Extended, 70% Extended, and On Tires. The operator is setting up in a confined space where the outriggers can only be extended to 65% of their full spread. Which chart should be used to determine the crane's capacity?
Answer options: ✅ The 'On Tires' chart.
- The '70% Extended' chart, with an additional 10% reduction applied.
- Interpolate between '70% Extended' and 'On Tires' charts.
- The crane cannot be used in this configuration.
Correct answer: The 'On Tires' chart.
Explanation: According to CSA Z150, when outriggers are set up in a configuration less than specified on the chart (e.g., 65% when only 70% and 100% are provided), the operator must use the next more restrictive chart or the 'On Tires' chart to ensure safety. In this case, the 'On Tires' chart is the most restrictive option available.
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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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