Which option is not used to control swinging loads?

Which option is not used to control swinging loads?

• A. Bridge or trolley controls
• B. Bridge or hoist controls
• C. Trolley or hoist controls
• D. Limit switch and hoist controls

Answer: (D)

Controlling swinging loads relies on smooth, coordinated use of the crane’s moving parts to dampen motion. By moving the load horizontally with the bridge or the trolley, and coordinating any vertical movement with the hoist, you counteract the swing and bring the load to rest in a controlled way. The bridge, trolley, and hoist combinations are all ways to achieve that dampening through deliberate, gradual movements. A limit switch, though, is a safety device that simply stops movement when a travel limit is reached. It does not actively damp or control the load’s swing, so it isn’t used for swinging-load control.

Controlling swinging loads relies on smooth, coordinated use of the crane’s moving parts to dampen motion. By moving the load horizontally with the bridge or the trolley, and coordinating any vertical movement with the hoist, you counteract the swing and bring the load to rest in a controlled way. The bridge, trolley, and hoist combinations are all ways to achieve that dampening through deliberate, gradual movements.

A limit switch, though, is a safety device that simply stops movement when a travel limit is reached. It does not actively damp or control the load’s swing, so it isn’t used for swinging-load control.