Which component is involved in safety by halting motion if descent speed is excessive?

• A. Chairlift Operation Inspection
• B. Rack and Pinion
• C. Overspeed Safety Sensor
• D. Talcum Powder Application

Answer: (C)

An overspeed safety sensor is used to halt motion when the descent speed becomes excessive. It constantly monitors how fast the descent is moving and compares it to a safe, preset limit. If the speed goes beyond that limit, the sensor sends a signal to the drive/control system to engage the brake and stop the machine, preventing a dangerous runaway or loss of control for riders. This safety feature is a direct part of the escalator/moving walk’s protection against excessive speed during descent.

The other options don’t perform this real-time speed monitoring and automatic stopping function. A chairlift operation inspection is a maintenance/verification activity rather than a live safety device. A rack and pinion is a mechanical gear arrangement and isn’t a safety sensor for speed. Talcum powder application is a lubrication/cleaning action and has no role in stopping motion due to overspeed.