Explore topic-wise MCQs in Network Theory.

This section includes 289 Mcqs, each offering curated multiple-choice questions to sharpen your Network Theory knowledge and support exam preparation. Choose a topic below to get started.

1.

In the circuit shown below, the values of i(0+) and i( ), will be respectively

A. 0 and 1 5A
B. 1 5A and 3A
C. 3A and 0A
D. 3A and 1 5A
Answer» D. 3A and 1 5A
Discussion
2.

For a two-port network the three parameters A, B and C are given by
A = x1, B = x2, C = 1 x2
then D is equal to under the network to be reciprocal

A. 1 x1
B. 0
C. 2 x1
D. 2 x1
Answer» D. 2 x1
Discussion
3.

For the figure given below which of these sets of E, R and C value will ensure that the state equation dVc / dt = 1.25 VC + 2 is valid

A. 2 V, 1 , 1.25 F
B. 1.6 V, 0.8 , 1 F
C. 1.6 V, 1 , 0.8 F
D. 2 V, 1.25 , 1 F
Answer» F.
Discussion
4.

Given T.F. H (s) = s + 2 / s2 + s + 4, under steady state condition, the sinusoidal input and output are respectively
x (t) = cos 2t
y (t) = cos (2t + ), then angle of will be

A. 45
B. 0
C. 45
D. 90
Answer» D. 90
Discussion
5.

Extra element present in the given circuit

A. C
B.
C. C
D. C
E. R
Answer» B.
Discussion
6.

The Laplace transform of a function f(t) u(t), where f (t) is periodic with period T, is A(s) times the L.T. of its first period. Then

A. A(s) = s
B.
C. A (s) = e
Answer» C. A (s) = e
Discussion
7.

The resonant frequency of the circuit

A.
B.
C.
Answer» B.
Discussion
8.

In the figure the transformer is ideal with adjustable turns ratio N2 / N1 . The turns ratio N2 / N1 for maximum power transfer to the load is

A. 1: 1
B. 100: 1
C. 1: 100
D. 1000: 1
Answer» D. 1000: 1
Discussion
9.

A single phase transformer is connected as shown in fig. when a voltage of 100 V (rms) was applied across AB, the voltmeter connected across AC measured 100 V (rms). The turns ratio N1: N2 is

A. 1: 1
B. 1: 2
C. 2: 1
D. 4: 1
Answer» C. 2: 1
Discussion
10.

Find the value of R so that V2 = 2 volt

A.
B. 2
C. 5
Answer» C. 5
Discussion
11.

Find VC (0+) for the circuit

A. 2 V
B. 2 V
C. 6 V
D. 8 V
Answer» B. 2 V
Discussion
12.

Given iL (0+) = 0, VC (0 ) = 0 in the steady state VC equals to

A. 200 V
B. 100 V
C. 0 V
D. 100 V
Answer» C. 0 V
Discussion
13.

What will be the value of Rth between A and B for the given circuit shown below?

A. 2 R
B. R
Answer» E.
Discussion
14.

What will be the voltage across the capacitor at t = 0+ for given figure?

A. 2 V
B. 2 V
C. 4 V
D. 1 V
Answer» C. 4 V
Discussion
15.

Switch S in position (1) for long time and moved to position (2) at t = 0 sec. obtain at t = 0+ the value of i L (0+)

A. 3 amp
B. 6 amp
C. 2 amp
D. 5 amp
Answer» B. 6 amp
Discussion
16.

For the networks shown in the figures (a) and (b) to be duals, it is necessary that R , L and C are respectively equal to

A.
B.
Answer» B.
Discussion
17.

The Y11-parameters for the given network shown below are

A.
Answer» B.
Discussion
18.

If L {f (t)} =
s2 + 2
, then the value of lim t f (t)

A. cannot be determined
B. Zero
C. 1
D.
Answer» B. Zero
Discussion
19.

Switch S in position (a) for a long time and moves to be at t = 0. The value of VC and dVC / dt at t = 0+

A. 12 V, 8 V
B. 12 V, 8 V
C. 4 V, 8 V
D. 4 V, 8 V
Answer» B. 12 V, 8 V
Discussion
20.

A series R-L circuit is initially released. A step voltage is applied to the circuit. If is the time constant of the circuit, the voltage across R and L will be same at time t equal to

A. log
B. 2
C.
Answer» B. 2
Discussion
21.

In figure shown A1, A2, A3 are ideal ammeters. If A1 and A3 read 5 A and 13 A respectively reading of A2 will be

A. 8 A
B. 12 A
C. 18 A
D. Indeterminate unless the actual values of R, C and W are specified
Answer» C. 18 A
Discussion
22.

The Resistance RAB in the circuit is

A. 12
B. 10.8
C. 6.75
D. 9
Answer» E.
Discussion
23.

In a series RLC circuit excited by a voltage
V (t) = A sin t where 2 < 1

A. a current lags the excitation voltage.
B. the excitation voltage lags the current.
C. the voltage across the inductor is < the voltage across the capacitor.
D. the voltage across the inductor is > the voltage across the capacitor.
Answer» C. the voltage across the inductor is < the voltage across the capacitor.
Discussion
24.

The transform of the square wave can be represented as

A.
B.
Answer» C.
Discussion
25.

System function H (s) =
1
, for a signal cos t, the steady state response is
s + 1
A.
B.
Answer» C.
Discussion
26.

The Laplace transform of the sawtooth waveform is

A.
B.
C.
Answer» B.
Discussion
27.

The voltage of the source i.e. Vs, if i (t) = 20 e 2t

A. 10 e
B.
C. 10 e
D. 20 e
E. 20 e
Answer» B.
Discussion
28.

The Laplace transform of the function f (t) = et2 4t will be

A. does not exist
Answer» E.
Discussion
29.

The capacitor C1 in the circuit shown has a voltage of 20 V across it before the switch S is closed at time t = 0. C1 = 2 F and C2 = 3 F. The voltage across C2 after S is closed is

A. 8 V
B. 10 V
C. 12 V
D. 15 V
Answer» B. 10 V
Discussion
30.

For fig. at time t 0 after the switch K was closed, it is found that V2 = + 5 V, determine the value of i 2 (t 0) and d / dt i2 (t 0)

A. 2.5 amp, 5 amp/sec
B. 2.5 amp, 2.5 amp/sec
C. 5 amp, 2.5 amp/sec
D. 5 amp, 5 amp/sec
Answer» B. 2.5 amp, 2.5 amp/sec
Discussion
31.

The Thevenin equivalent voltage Vm appearing between the terminals A and B of the network shown is given by

A. J 16 (3 J 4)
B. J 16 (J 3 + 4)
C. J 6 (3 + J 4)
D. J 6 (3 J 4)
Answer» C. J 6 (3 + J 4)
Discussion
32.

The circuit shown in the figure is in steady state, when the switch is closed at t = 0. Assuming that the inductance is ideal, the current through the inductor at t = 0+ equals

A. 0A
B. 0 5 A
C. 1A
D. 2A
Answer» D. 2A
Discussion
33.

If, at t = 0+, the voltage across the coil is 120V, the value of resistance R is

A. 0
B. 20
C. 40
D. 60
Answer» B. 20
Discussion
34.

For the circuit shown in figure, the voltage Vs will be

A. 12 V
B. 8 V
C. 4 V
D. 13 V
Answer» E.
Discussion
35.

In the circuit shown in figure, the switch S is closed at time t = 0. The voltage across the inductance at t = 0+, is

A. 2V
B. 4V
C. 6 V
D. 8V
Answer» C. 6 V
Discussion
36.

In fig. (a) the values i L, Vc as shown have initial values i L (0 ) = 1 and Vc (0 ) = 2 fig. (b) is the equivalent circuit in the s-domain. The values of V1 and V2 are

A.
B.
C. 1 and 2
Answer» C. 1 and 2
Discussion
37.

The voltage marked Vx is given by

A. None of these.
Answer» C.
Discussion
38.

In the circuit V2 = 2 V and I1 = 2 amp. The value of Is is given by

A. 2
B. 4
C. 5
D. 6
Answer» C. 5
Discussion
39.

For the given graph, match List I with List II


List I List II
A.1, 2, 3, 4 1. Twigs
B.4, 5, 6, 72. Links
C.1, 2, 3, 4 3. Fundamental cutset
D. 1, 4, 5, 6, 7 4.Fundamental loop
A. 3 1 2 4
B. 2 3 1 4
C. 3 2 1 4
D. 1 2 3 4
Answer» B. 2 3 1 4
Discussion
40.

The dimension of LC is

A. zero
B.
C. (second)
D.
E. (second)
Answer» E. (second)
Discussion
41.

The Laplace transform of (t 2 2t) u (t 1) is

A. None of these
Answer» E.
Discussion
42.

For the circuit shown below in the figure, the voltage V0 is

A. 2 V
B. 1 V
C. 1 V
D. None of these
Answer» E.
Discussion
43.

The natural frequency Sn of the given circuit is

A. 1
B. -1
C. 2
Answer» C. 2
Discussion
44.

Given V2 = 1 e 2t, the value of V1 is given by

A. 3 + e
B. 1 + 3 e
C. 4 + 2 e
D. 4
Answer» E.
Discussion
45.

In the circuit of the given figure, the magnitude of VL and VC are twice that of VR. The inductance of the coil is

A. 2.14 mH
B. 5.30 H
C. 31.8 mH
D. 1.32 H
Answer» D. 1.32 H
Discussion
46.

Initial voltage on capacitor V0 as marked | V0 | = 5 V. Vs = 8 u(t), where u(t) is the unit step. The voltage marked V at t = 0+ is given by

A. 1 V
B. 1 V
Answer» D.
Discussion
47.

A voltage waveform V (t) = 12 t 2 is applied across 1 H inductor for t 0, with initial current through it being zero the current through the inductor for t 0 is given by

A. 12 t
B. 24 t
C. 12 t
D. 4 t
Answer» E.
Discussion
48.

In the circuit Vs = cos 2t. The value of C is chosen so that I from Vs is in phase with Vs. Then Ic leads IL by an angle given by

A. 45
B. 90
C. 135
D. 0
Answer» D. 0
Discussion
49.

S is in position (a) for a long time. S moved to position (b) at t = 0 , At t = 0+, the values of IC and VL are

A. 5, 0
B. 5, 0
C. 0, 4
D. 2, 3
Answer» B. 5, 0
Discussion
50.

A source Vs = 200 cos t delivers power to a load at power factor 0.8 lagging. The reactive power is 300 VAR. The Pav is given by

A. 200 watts
B. 225 watts
C. 400 watts
D. 300 watts
Answer» D. 300 watts
Discussion