Crane Operator Certification Exam Prep · Question
When operating a mobile crane, what is the primary purpose of the anti-two-block (ATB) device?
The anti-two-block device is a critical safety system designed to prevent damage to the crane by stopping the hoist up function before the hook block makes cont
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Question: When operating a mobile crane, what is the primary purpose of the anti-two-block (ATB) device?
Answer options: ✅ To prevent the hook block from contacting the boom tip or reeving.
- To limit the crane's swing speed.
- To measure the main hoist line pull.
- To automatically engage the parking brake when the engine is off.
Correct answer: To prevent the hook block from contacting the boom tip or reeving.
Explanation: The anti-two-block device is a critical safety system designed to prevent damage to the crane by stopping the hoist up function before the hook block makes contact with the boom point or jib, which could cause wire rope damage or structural failure.
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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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