NCCCO Rigger 1 Study Questions and Answers

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6x19 classification - ✔✔Wire rope with 15-26 wires per strand Synthetic web sling inspection - ✔✔Daily inspection before use Mobile crane lifting operations - ✔✔Suspend operations in winds over 35 mph Wire rope sling surface wear - ✔✔Abrasion from rubbing or sliding Wire rope sling removal from service - ✔✔Ten broken wires in one lay Rigging hardware and sling inspection - ✔✔Inspected for damage or defects by a competent person Dynamic force on crane - ✔✔Side pull when hoist line is not vertical Sling failure load - ✔✔Breaking strength Non-shouldered eyebolt lifting plane - ✔✔Vertical lifting plane Maximum width in wire rope sling eye - ✔✔1/2 the length according to ASME B30.9 Crane stress increase during sudden loading - ✔✔Shock loading Sling length formula - ✔✔A2 + B2 = C Weight of one cubic foot of steel - ✔✔Approximately 480 pounds (Ibs) Permanent identification tag sling - ✔✔Alloy steel chain sling with size, grade, and capacity Wire rope diameter measurement - ✔✔Across the crowns Working load limit of slings - ✔✔Breaking strength divided by design factor

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