Which type of elevator system predominantly uses cable-driven motion?

The correct answer is electric elevators, which predominantly utilize a cable-driven system for motion. In electric elevators, a motor drives a pulley system that raises and lowers the elevator car by pulling on a set of cables. This cable-driven mechanism allows for smooth and efficient movement both upward and downward.

Electric elevators are widely used in various types of buildings, from residential to commercial high-rises, because they can service multiple floors effectively and are suitable for greater heights compared to other systems. The design of these elevators facilitates easy maintenance and offers precise control over speed and positioning, making them a popular choice in modern construction.

In contrast, hydraulic elevators operate using a hydraulic system that relies on fluid pressure to raise and lower the elevator car, thus they do not use cables for motion. Pneumatic elevators utilize air pressure to drive the car up and down within a tube and also do not involve cables. Vacuum elevators function similarly, relying on air pressure differences to move the car, further distinguishing them from cable-driven systems.