What defines a telescoping boom crane?

A telescoping boom crane is defined by its unique design that features nested boom sections, allowing it to extend and retract. This extends the crane's reach and provides flexibility in lifting capabilities. The design enables the operator to adjust the boom length according to the specific requirements of a lift, making it highly versatile for various tasks in construction, maintenance, and other applications.

The ability to extend and retract the boom is crucial for reaching different heights and distances while maintaining stability and control. This adaptability can enhance efficiency and safety on job sites, as it allows for maneuvers in areas where space may be limited.

The other options do not accurately describe a telescoping boom crane. For instance, a crane with a fixed length boom lacks the essential mechanism of extension that characterizes telescoping cranes. Similarly, while some cranes can rotate freely, this trait isn't exclusive to telescoping boom cranes—many types of cranes have this capability. Finally, although telescoping boom cranes are often used in construction, their design isn't exclusive to this field, as they can serve various applications outside of construction as well.