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Measurements & Instrumentation Dynamic Characteristics

A first-order low-pass sensor has a time constant of 0.2 s. After a step input, it reaches about 63.2% of its final change after?

A0.1 s
B0.2 s
C0.4 s
D1 s

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Correct Answer: B. 0.2 s

Explanation: A first-order system reaches 1-e^-1≈63.2% of its final change after one time constant.

Reference: Standard measurements and instrumentation: dynamic characteristics

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