For a swinging load, which pair of controls governs it?

For a swinging load, which pair of controls governs it?

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

Answer: (A)

Swinging load is controlled by horizontal motion, so you govern it by moving the load along its path using the devices that drive horizontal travel: the bridge controller moves the entire bridge along the runway, and the trolley controller moves the trolley along the bridge. The hoist controller only raises and lowers the load, which affects vertical position, not sway. While vertical movement can position the load, it isn’t how you manage swing. Safety devices like limit switches don’t actively control sway; they stop motion when limits are reached. So, the combination of bridge and trolley controllers is what governs a swinging load.

Swinging load is controlled by horizontal motion, so you govern it by moving the load along its path using the devices that drive horizontal travel: the bridge controller moves the entire bridge along the runway, and the trolley controller moves the trolley along the bridge. The hoist controller only raises and lowers the load, which affects vertical position, not sway. While vertical movement can position the load, it isn’t how you manage swing. Safety devices like limit switches don’t actively control sway; they stop motion when limits are reached. So, the combination of bridge and trolley controllers is what governs a swinging load.