Crane Operator Certification Exam Prep · Question
During a routine lift, the hoist limit switch on a telescopic boom crane fails, and the operator is distracted momentarily. What imminent and severe hazard could occur if the block continues to be hoisted without intervention?
Two-blocking occurs when the load block or headache ball contacts the boom tip sheaves, causing damage to the hoist rope, boom tip, and potentially catastrophic
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Question: During a routine lift, the hoist limit switch on a telescopic boom crane fails, and the operator is distracted momentarily. What imminent and severe hazard could occur if the block continues to be hoisted without intervention?
Answer options:
- Boom deflection
- Sheave wear ✅ Two-blocking
- Swing brake failure
Correct answer: Two-blocking
Explanation: Two-blocking occurs when the load block or headache ball contacts the boom tip sheaves, causing damage to the hoist rope, boom tip, and potentially catastrophic failure of the crane if continued hoisting ruptures the rope.
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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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