Elevator Mechanic Practice Exam

What is the function of adding more wraps to a capstan hoist?

1. Decrease tension

2. Increase control

3. Increase friction

4. Reduce load

The correct answer is: Decrease tension

The addition of more wraps to a capstan hoist primarily serves to increase friction. Friction is essential in a capstan hoist system because it allows for better gripping of the rope or cable being wound around the capstan, which in turn improves the hoisting capability. The increased friction from more wraps ensures that the load can be held securely and controlled effectively, preventing slippage when lifting or lowering loads. Furthermore, while increasing the number of wraps may initially give the impression of reducing tension, the reality is that the overall capacity of the hoist to handle the load increases because of the enhanced friction gripping effect. Thus, the primary function is to increase friction to manage loads more effectively and improve control over the operation.