What is the mounting point for the boom and counter weight assembly?

What is the mounting point for the boom and counter weight assembly?

• A. Base
• B. Mast
• C. Turntable
• D. Frame

Answer: (C)

The turntable is the rotating platform that supports the upper works of a crane. The boom and its counterweight are part of those upper works, and they need to rotate relative to the ground system without twisting the base. The turntable provides the mounting surface and the slewing bearing that let the upper structure rotate smoothly while staying balanced. The base stays fixed to the ground, the mast is the vertical member that supports the upper assembly, and the frame is the overall structure; but the specific mounting point for the boom and counterweight is the turntable because it is the rotating joint that carries and balances the upper assembly.

The turntable is the rotating platform that supports the upper works of a crane. The boom and its counterweight are part of those upper works, and they need to rotate relative to the ground system without twisting the base. The turntable provides the mounting surface and the slewing bearing that let the upper structure rotate smoothly while staying balanced. The base stays fixed to the ground, the mast is the vertical member that supports the upper assembly, and the frame is the overall structure; but the specific mounting point for the boom and counterweight is the turntable because it is the rotating joint that carries and balances the upper assembly.