Which signal indicates trolley operation?

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Multiple Choice

Which signal indicates trolley operation?

Explanation:
The signal for trolley operation is the one that tells the operator to move the trolley along the bridge. In overhead crane systems, signals are assigned to specific motions: travel controls the bridge moving along the runway, lowering controls the hoist lowering, the trolley signal moves the trolley itself (the carriage that carries the hoist) left or right along the bridge, and the emergency stop halts all motion. So the trolley signal is the correct choice because it specifically governs horizontal movement of the trolley, not the bridge or the hoist.

The signal for trolley operation is the one that tells the operator to move the trolley along the bridge. In overhead crane systems, signals are assigned to specific motions: travel controls the bridge moving along the runway, lowering controls the hoist lowering, the trolley signal moves the trolley itself (the carriage that carries the hoist) left or right along the bridge, and the emergency stop halts all motion. So the trolley signal is the correct choice because it specifically governs horizontal movement of the trolley, not the bridge or the hoist.

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