Networks - GATE practice papers - Electronics & Communication for Q. 522

Q.  What will be the value of time constant for the network shown below?


(Marks : 02)
- Published on 19 Oct 15

a. 5RC
b. 4RC
c. (4/5) RC
d. RC /5

ANSWER: (4/5) RC
 
By replacing the voltage source in terms of internal impedance, the equivalent circuit is shown below.

From the above equivalent network, it is obvious that

Req = (R x 4R) / 5R
= 4R /5
Also, the time constant (τ) = Req x C
= (4 /5) RC

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