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

Under what condition can a crane be side loaded?

1. When lifting a heavy object

2. With a freely suspended load

3. When performing maintenance

4. After setting the load down

The correct answer is: With a freely suspended load

The correct answer highlights the condition of a crane being side loaded with a freely suspended load. Side loading refers to forces that are applied to the crane's structure from the side, rather than directly above, which can create uneven stress on the crane's components. In the case of a freely suspended load, the load hangs below the crane without any contact with other surfaces or restrictions that could cause lateral forces. The crane is designed to operate efficiently and safely while lifting loads vertically. If the load is freely suspended and the crane is properly set up, it can handle minor side loads that may occur due to wind or movement without significant risk of structural failure. Other scenarios, such as lifting a heavy object, performing maintenance, or after setting the load down, inherently come with different risks and stress factors that could lead to accidents or equipment failure if side loading occurs. For instance, lifting heavy objects generally requires careful monitoring of the crane’s load capacities to avoid tipping or overloading, while maintenance may require the crane to be stationary and not subjected to additional forces. Setting a load down does not typically involve side loading conditions since the load is no longer suspended. Thus, it is critical to recognize that a freely suspended load is a unique situation where side loading might