What mechanism is typically used to control the speed of the elevator car?

The governor system is integral to controlling the speed of the elevator car. It acts as a safety device that monitors the speed of the elevator and can activate a braking mechanism if the car exceeds a predetermined speed. This is crucial for ensuring passenger safety and maintaining smooth operation, especially in scenarios where rapid descent or ascent might occur, potentially leading to accidents.

In contrast, while a mechanical brake system is important for stopping the elevator, it does not actively regulate speed during operation. The control panel switch allows users to select their desired floor but does not directly influence the speed of the car. A pulley system is involved in the mechanics of moving the elevator but does not contain any features designed to control speed specifically. Therefore, the governor system stands out as the key mechanism for speed control, providing a critical safety function necessary for elevator operation.