railway RRB JE (CBT I + CBT II) Mock Test 2024 Electronic Devices Optical Devices

The use of optical isolation in the input module side of a controller device is to:

1
Reduce the effect of electrical noise and prevent damage to the processor due to line voltage transient
2
Prevent damage the processor due to line voltage transient 
3
Provide common ground 
4
Reduce the effect of electrical noise
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