In a personnel hoist, what is the role of the drive sheave in hoisting operations?

The drive sheave plays a crucial role in the operation of a personnel hoist by creating friction necessary for the movement of the hoisting ropes. It is a wheel that acts as the key component for transferring the driving force from the motor to the ropes, enabling smooth and controlled lifting and lowering of the hoist car. The friction generated between the ropes and the sheave is what allows the motor's power to be efficiently transmitted, facilitating the movement of the load.

In contrast, the other roles mentioned in the other options do not accurately describe the primary function of the drive sheave. While guiding the car, securing the hoisting ropes, and supporting the car's weight are essential elements of a hoisting system, they do not specifically relate to the friction aspect which is fundamental to the operation of the drive sheave.