NCCCO Mobile Crane Practice Exam 2026 – Complete Study Guide

Question: 1 / 400

What is the function of the anti-two block system in cranes?

To increase the crane's lifting capacity

To prevent overloading the crane

To avoid the load line from reaching the boom's apex

The anti-two block system in cranes serves a critical safety function by preventing the load line from reaching the apex of the boom. When the two blocks—located at the top of the boom and on the hook—come into contact, it signifies that the hook has traveled too far upward, potentially resulting in damaging the crane or causing a dangerous situation. This system helps protect not only the crane equipment but also ensures the safety of the operator and personnel working nearby.

By stopping the upward movement of the hook when it nears the boom's apex, the anti-two block system mitigates the risk of excessive strain on the hoisting components and avoids catastrophic failures that could occur from excessive wear or breakage. This is essential for maintaining safe operating conditions and preventing accidents on the job site.

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To stabilize the load during lifting

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