Identify the component that connects the boom to the upperworks of the crane.

• A. Boom base
• B. Counterweight
• C. Slew ring
• D. Jib mast

Answer: (A)

The thing that actually links the end of the boom to the rest of the crane is the boom base. It serves as the mounting point where the boom attaches to the upperworks, transferring the loads from lifting to the crane’s rotating structure and allowing the boom to be raised, lowered, and stabilized. The other parts have different roles: the slew ring is the bearing that enables the upperworks to rotate on the base, the counterweight balances the crane, and the jib mast is part of a jib extension rather than the main boom connection. So the boom base is the direct connector between the boom and the upperworks.