NCCCO Mobile Crane Practice Exam 2026 - Free Crane Operator Certification Practice Questions and Study Guide

An anti-two-block device is primarily utilized to prevent the crane hook from coming into contact with the boom or other structural components, which is referred to as "two-blocking." This scenario can cause severe damage to the crane and pose safety hazards. The presence of an anti-two-block device serves to ensure that the crane's lifting mechanism remains safe by providing a physical barrier that interrupts the lifting process before contact occurs.

The function of an anti-two-block device is crucial for maintaining safe operations when testing various crane systems, including the Load Moment Indicator (LMI). The LMI is a highly integral part of crane operation that assesses the load on the crane and helps to prevent overloading, so testing it with the anti-two-block device ensures that all components work harmoniously to protect against accidents.

Using an anti-two-block device contributes to the overall safety protocol in crane operations, ensuring that the crane can be used effectively and efficiently without risk of damaging equipment or harming personnel.