How do hydraulic elevators differ from traction elevators?

Hydraulic elevators utilize a fluid-driven piston to facilitate movement. This mechanism involves pumping hydraulic fluid into a cylinder, which then drives a piston upwards or allows it to descend, thereby moving the elevator car. This system is distinct from traction elevators, which employ cables and a pulley mechanism for movement.

The use of a fluid-driven piston is a defining characteristic of hydraulic elevators, allowing them to operate smoothly and efficiently, especially in mid-rise applications. The reliance on hydraulic fluid also means that these elevators can generally handle heavier loads, making them suitable for a variety of applications.

In contrast, traction elevators do not employ this mechanism and instead rely on cables wound around a drum or sheave, which facilitates movement with the help of a counterweight. This helps improve efficiency by balancing the weight of the elevator car.

The other options present various misconceptions about hydraulic elevators. They are not limited to serving single floors; in fact, they can service multiple floors as well. While hydraulic elevators can be utilized in buildings of significant height, they are more common in low to mid-rise settings rather than high rises, where traction elevators are typically the preferred choice due to their faster speeds and efficiency over greater distances. Moreover, while hydraulic elevators can operate without a counterweight, the system's