Which of the following principles of operation is used by a photoelectric proximity switch?
A. Magnetic fields
B. Ultrasonic waves
C. Infrared light
D. Changes in capacitance
Answer:C
Which of the following principles of operation is used by a photoelectric proximity switch?
A. Magnetic fields B. Ultrasonic waves C. Infrared light D. Changes in capacitance
Explanation: A photoelectric proximity switch operates based on the detection of infrared light when an object comes into close proximity to the sensor.