Crane Operator Certification Exam Prep · Question
A 100-tonne mobile crane has a maximum outrigger pad load of 800 kN. If the site has soil with an ultimate bearing capacity of 250 kPa and a safety factor of 3 is required, what is the minimum total area of cribbing required for EACH outrigger?
Allowable bearing pressure = Ultimate Bearing Capacity / Safety Factor = 250 kPa / 3 = 83.33 kPa. Minimum area = Outrigger Load / Allowable Bearing Pressure = 8
Start free practice for Crane Operator Certification Exam Prep
404 questions · no signup required · 40 free questions per day
Question: A 100-tonne mobile crane has a maximum outrigger pad load of 800 kN. If the site has soil with an ultimate bearing capacity of 250 kPa and a safety factor of 3 is required, what is the minimum total area of cribbing required for EACH outrigger?
Answer options: ✅ 9.6 m²
- 3.2 m²
- 1.07 m²
- 2.4 m²
Correct answer: 9.6 m²
Explanation: Allowable bearing pressure = Ultimate Bearing Capacity / Safety Factor = 250 kPa / 3 = 83.33 kPa. Minimum area = Outrigger Load / Allowable Bearing Pressure = 800 kN / 83.33 kPa = 9.6 m².
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.