Crane Operator Certification Exam Prep · Question
A crane inspection reveals that a hook has an increased throat opening. For a hook with a nominal throat opening of 75 mm, what is the maximum permissible increase in throat opening before the hook must be retired according to CSA Z150?
CSA Z150, Clause 5.2.2.4 (c) Hook Inspection, specifies that hooks shall be removed from service if the throat opening is increased by more than 5%. For a 75 mm
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Question: A crane inspection reveals that a hook has an increased throat opening. For a hook with a nominal throat opening of 75 mm, what is the maximum permissible increase in throat opening before the hook must be retired according to CSA Z150?
Answer options: ✅ 5% increase.
- 10% increase.
- 15% increase.
- 20% increase.
Correct answer: 5% increase.
Explanation: CSA Z150, Clause 5.2.2.4 (c) Hook Inspection, specifies that hooks shall be removed from service if the throat opening is increased by more than 5%. For a 75 mm nominal throat opening, this means an increase exceeding 3.75 mm (75 mm * 0.05). An enlarged throat opening indicates the hook has been overloaded or subjected to undue stress, compromising its structural integrity and safety. This is a critical defect requiring immediate hook replacement.
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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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