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Answer Posted / jayaraj
1}///in earlier days we had used BJT transister in signal
conditioning circuits for amplification purposes so in BJT
transfer characteristics 4 to 20 milli amps is a linear
region,....but now-a-days we re using cmos only.... as a
convention only we are following this 4-20 range
2}///another reason...for not using 0 milli amp
coz if we use like that we cannot distinguish between true
signal zero and dead zero(break in wires)
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