Fixed Swing Crane Operations Practice Test

The number of rope layers on a drum directly affects what aspect of operation?

Hoist speed Rope wear Available line-pull Sheave alignment

Correct Answer:

Available line-pull

Explanation:

The main idea is that drum diameter sets how much rope the hoist can effectively pull with a given torque. The rope pull you get is essentially torque divided by the drum radius. As you wind more rope, the drum’s effective radius increases, so the same motor torque yields a smaller force on the rope. In other words, increasing rope layers reduces the available line-pull. Hoist speed is mostly about motor RPM and gearing, not the drum’s wrap count. Rope wear can be influenced by load and rope condition, but the direct, immediate effect of adding layers is not wear. Sheave alignment depends on rope path and pulleys, not how much rope sits on the drum.

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