Chemical Engineering > GATE 2011 > Signal Transmission
The range of standard current signal in process instruments is 4 to 20 mA. Which ONE of the following is the reason for choosing the minimum signal as 4 mA instead of 0 mA?
A
To minimise resistive heating in instruments
B
To distinguish between signal failure and minimum signal condition
C
To ensure a smaller difference between maximum and minimum signal
D
To ensure compatibility with other instruments

Correct : b

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