Proximity sensor Interview questions and answer

Proximity switch interview questions and answer
types of proximity switch
what is the proximity switch
2 wire proximity sensor
3 wire proximity sensor
4 wire proximity sensor
Difference between 2 wire, 3 wire and 4 wire proximity switch
inductive proximity switch
capacitive proximity switch
magnetic proximity switch
infrared proximity switch
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[@bharatelectricalteach431]

Very nice Guru ji

[@mohsinraza9944]

Sounds not clear