The recommended pulley diameter relative to rope diameter is at least four times the rope diameter.

• A. Not specified
• B. True
• C. Only for certain rope types
• D. False

Answer: (B)

When a rope passes over a pulley, the bend radius determines how gently the rope is curved. A pulley diameter that is at least four times the rope diameter keeps the rope from bending too sharply. This gentler bend reduces bending stress on the rope fibers, minimizes wear and abrasion at the contact arc, and lowers heat from friction. All of this helps preserve the rope’s strength and longevity and improves safety during loading and operation.

This is a general guideline used in rigging and rescue settings, not something limited to specific rope types. If the pulley were smaller, the rope would bend more tightly, increasing wear and potential damage. So the statement is true.