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Exam Questions Papers - Engineering

Q1:

V(t) across R2 for t > 0 is given by,

A 2 - 2e-2t

B 2 - e-2t

C 2 - e-t

D 1 - e-t

ANS:B - 2 - e-2t

Time constant t = RC Req for t > 0 is; R1 = R2 = C = 1F ∴ t = 1/2 ∴ V(t) = VF - (VF - Vi)e-t/z VF = VR2(t = ∞) = 2 V Vi = VR2 (t = 0+) = 1 V V(t) = 2 - (2 - 1)e-t/1/2 V(t) = 2 - e-2t.