NCCCO Mobile Crane Practice Exam 2026 – Complete Study Guide

Question: 1 / 400

What does "two-blocking" refer to and why is it dangerous?

When the load block comes into contact with the crane boom, risking severe equipment damage

"Two-blocking" refers to the situation where the load block comes into contact with the crane boom. This can occur when the hoist cable is pulled too short, causing the block to reach the booms' upper structure. This situation poses a significant danger because it can lead to severe equipment damage, including the potential for catastrophic failure of the crane. The sudden impact can compromise the integrity of both the load block and the boom itself, and it may even cause the crane to tip over or collapse.

Understanding the implications of two-blocking is crucial for crane operators because it underscores the necessity for careful monitoring of the load's height and the equipment's movements. Operators must be trained to recognize the signs of two-blocking and incorporate safety measures to prevent this occurrence, thus ensuring equipment safety and operational efficiency.

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A situation where the load is lifted too high, causing loss of control

The process of lowering a load too quickly can lead to accidents

Collapsing a load due to improper rigging techniques

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