NEIEP Mechanics Practice Exam

Which device is primarily responsible for detecting overspeed in an elevator?

1. Limit switch

2. Speed governor

3. Brake system

4. Relay controller

The correct answer is: Speed governor

The device that is primarily responsible for detecting overspeed in an elevator is the speed governor. This component is crucial for safety as it monitors the speed of the elevator car as it travels up and down the hoistway. If the elevator car exceeds a predetermined speed, the speed governor triggers a safety mechanism to slow down or stop the elevator, preventing it from exceeding safe operational limits. The speed governor operates by using a centrifugal system that responds to changes in speed, allowing it to act quickly in the event of potential overspeed conditions. This effectiveness in monitoring speed ensures that the elevator can operate safely for passengers and maintain compliance with safety regulations. While other devices like limit switches and brake systems play important roles in elevator function and safety, they are not primarily responsible for overspeed detection. Limit switches are designed to detect the position of the elevator, and brake systems function to stop the car when needed, but it’s the speed governor that actively monitors and responds to speed variations.