National Commission for the Certification of Crane Operators (NCCCO) Mobile Crane Practice Exam

What standard method hand signal is illustrated when retracting the boom?

1. Boom up

2. Boom down

3. Retract boom

4. Hoist

The correct answer is: Retract boom

The standard method hand signal for retracting the boom is represented by the gesture commonly used to indicate this specific action clearly. When retracting the boom, the operator typically uses a signal that involves sweeping the arm inwards towards the body, representing the action of bringing the boom section back. This visual cue effectively communicates the desired movement to the crane operator, enhancing safety and ensuring that the crane operates as intended. The option focusing on boom up refers to raising the boom's angle, while boom down signals the opposite motion of lowering the boom. Both of these actions involve vertical movement but do not specifically address the retracting motion. Additionally, the hoist signal is used for lifting loads vertically rather than adjusting the position of the boom itself, making it unrelated to retracting the boom. Thus, the gesture for retracting the boom is distinct and clearly serves its purpose, highlighting the importance of using the correct signal for effective communication during crane operations.