A sensor requires 30 s to indicate 90% of the response to a step input. If the sensor is a first-order system, the time constant is [given, loge (0.1) = -2.3]

A sensor requires 30 s to indicate 90% of the response to a step input

1.	A sensor requires 30 s to indicate 90% of the response to a step input. If the sensor is a first-order system, the time constant is [given, loge (0.1) = -2.3]
A.	15 s
B.	13 s
C.	21 s
D.	28 s
Answer» C. 21 s

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A sensor requires 30 s to indicate 90% of the response to a step input. If the sensor is a first-order system, the time constant is [given, loge (0.1) = -2.3]

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