Discussion
In LM 317 minimum value of voltage required between its input and output for proper functioning is :
Answer: A
The minimum input-output voltage for the LM317 is 3 V.
The LM317 adjustable regulator needs a minimum difference (dropout) between its input and output to keep regulating. The datasheet specifies line regulation for an input-output differential from 3 V up to 40 V, so designers keep at least about 3 V of headroom.
1 V is below that headroom, and 5 V or 10 V are larger margins than the minimum the device needs, so they are not the minimum value.
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