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Automatic Control Systems - Engineering

Q1:

When a unit step voltage drives a lag network the output

A remains constant at unit step value

B increases exponentially from zero to final value

C decreases exponentially from 1 to 0

D either (b) of (c) depending on values of R and C

ANS:B - increases exponentially from zero to final value

At t = 0 the capacitor behaves as a short-circuit and output voltage is 0. At t = ∞ capacitor behaves as an open-circuit and V0 = Vi.