Electronics and Communication Engineering - Networks Analysis and Synthesis

31.
In the circuit of figure the current through 5 Ω resistance at t = ∞ is
0 A
10 A
6.67 A
5.1 A
Answer: Option
Explanation:

The 5 ohm resistance is short-circuited by inductance.


32.
In an infinite ladder Ckt as shown above each resistance of rΩ then RAB
1.61 Ω
none
Answer: Option
Explanation:

Let RAB = R

R = r + r || R

R = 1.61r.


33.
A series resonant circuit has R = 2 Ω, L = 0.1 H and C =10 μF. At resonance applied voltage = 10 ∠0 V. Voltage across inductance is likely to be
10 ∠0 V
10 ∠45° V
100 ∠90° V
100 ∠-90° V
Answer: Option
Explanation:

Voltage across inductance = QV and leads the applied voltage.


34.
The admittance parameter Y12 in the 2 port network in the figure
-0.2 mho
0.1 mho
-0.05 mho
0.05 mho
Answer: Option
Explanation:

I1 = y11 V1 + y12 V2 y12 = V1 = 0

If V1 = 0 then

y12 = 0.1 mho.


35.
The differential equation for the current i(t) in the Ckt is
Answer: Option
Explanation:

Apply KVL

.