Crane Operator Certification Exam Prep · Question
When would a 'two-block' condition typically occur?
Two-blocking occurs when the load block (or headache ball) is hoisted into contact with the boom tip sheaves (upper block), which can damage the crane and riggi
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Question: When would a 'two-block' condition typically occur?
Answer options:
- When the load is significantly lighter than the crane's capacity. ✅ When the headache ball (lower block) makes contact with the boom tip (upper block).
- When the crane experiences excessive wind speeds during operation.
- When the outriggers are not properly deployed.
Correct answer: When the headache ball (lower block) makes contact with the boom tip (upper block).
Explanation: Two-blocking occurs when the load block (or headache ball) is hoisted into contact with the boom tip sheaves (upper block), which can damage the crane and rigging.
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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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