The transfer function of transportation lag is e–sT. If

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The transfer function of transportation lag is e^–sT. If the lag is small as compare to the time constant of the system, it can be approximated by—

1. sT
2. 1 + sT
3. 1 – sT
4. 1/1 + sT

Correct Option: C

On expanding

e^–sT = 1 + (–sT) +	(–sT)²	+...........
	L²

e^–sT = 1 – sT neglecting higher order terms.