What is a sheave?

• A. A type of rope
• B. A grooved wheel for directing a rope
• C. A method of rigging
• D. A safety device used in lifting

Answer: (B)

A sheave is defined specifically as a grooved wheel that is used to guide or direct a rope, cable, or wire. The groove in the sheave allows the rope to ride smoothly, facilitating efficient movement and reducing friction as loads are lifted or moved. In rigging and lifting operations, sheaves are critical components in block and tackle systems, where they help to change the direction of force and distribute weight effectively. This function is essential in various applications, such as cranes, elevators, and other lifting equipment.

Understanding the role of a sheave is important for managing mechanical advantages and ensuring that lifting systems operate safely and efficiently. Recognizing this defines why the option related to the grooved wheel is the accurate description of a sheave.