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The questions below are not necessarily limited to one answer more than one correct answer may be present Problem A. The time constant of a first order system is A) An indication of the reaction time of the system to a given input . B) The time at which the system reaches 63.2% of its final value C) Depending only on the input voltage D) None of the above Problem B. Draw the qualitative behavior of the voltage response of an RC circuit to a step input forcing function.

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Answer #1

Option b)

It coincides with 1/bandwidth and it's the time value in the first order lag 11+jωτ11+jωτ or 11+τs11+τs . In radioactive decay they use 50% ('half-life)

B)

RIH VTu RiIu VIH TH A capacitor connected to a Thevenin equivalent A capacitor connected to a Norton equivalent

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