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Crane Operator Certification Exam Prep · Question

What is the purpose of an anti-two-block device on a crane?

An anti-two-block device is a safety mechanism designed to prevent the hoist block from contacting the boom tip, which could cause severe damage or rope failure

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Question: What is the purpose of an anti-two-block device on a crane?

Answer options:

  • To prevent the load from swinging ✅ To stop the hook block from contacting the boom tip
  • To measure the load weight
  • To control the engine speed

Correct answer: To stop the hook block from contacting the boom tip

Explanation: An anti-two-block device is a safety mechanism designed to prevent the hoist block from contacting the boom tip, which could cause severe damage or rope failure.

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