Red Seal Plumbing Practice Exam

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What is required to activate an electronically controlled water on/off device for a sink?

A switch
A timer
A beam of light is interrupted
A touch sensor

The correct answer is: A beam of light is interrupted

Electronically controlled water on/off devices for sinks can be activated in a variety of ways. However, the most common method involves the use of infrared sensors. These sensors detect when a beam of light has been interrupted, usually by a hand or object being placed within the sensor's field of detection. This causes the device to activate and turn on the water flow. The other options listed, such as a switch, timer, and touch sensor, are all possible methods of activating the device but are not commonly used and may not be specifically designed for this purpose. Therefore, the best option for activating an electronically controlled water on/off device for a sink is to interrupt a beam of light.