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.

51.

Pcomplex = 200 + J 150 from a source Vs = 200 cos t. The impedance across Vs is given by

A. 16 + J 12
B. 128 + J 96
C. 64 + J 48
D. 32 + J 24
Answer» D. 32 + J 24
Discussion
52.

S is open, V0 = 6 V, i = 0. S is closed at t = 0, the values of i and at t = 0+ are given by

A. 0, 6
B. 2, 0
C. 1, 3
D. 0, 3
Answer» E.
Discussion
53.

In the figure Vs = 10 cos t = 10 0 . The current drawn from Vs is given by the phasor

A. 2 2 45
B. 2 0
C. 2 90
Answer» C. 2 90
Discussion
54.

The network shown, if iR = (4 e 3t + 5 e 4t) amp and i L (0) = 15 amp, then at t = 0 would be equal to

A. 2
Answer» C.
Discussion
55.

A resistor R of 1 and two inductors L1 and L2 of inductances 1H and 2H respectively, are connected in parallel. At some time, the currents through L1 and L2 are 1A and 2A. The current through R at time t = will be

A. Zero
B. 1A
C. 2A
D. 3A
Answer» B. 1A
Discussion
56.

For the network shown below, the switch S is closed at t = 0 with the capacitor uncharged. The value of di(t) / dt at t = 0+ will be

A. 100 A/sec
B. 100 A/sec
C. 1000 A/sec
D. 1000 A/sec
Answer» C. 1000 A/sec
Discussion
57.

Consider the following properties of a particular network theorem:
1. The theorem is not concerned with type of elements.
2. The theorem is only based on the two Kirchoff s laws.
3. The reference directions of the branch voltages and currents are arbitarary except that they have to satisfy Kirchoff s laws.
Which one of the following theorems has the above characteristics?

A. Thevenin s theorem
B. Norton s theorem
C. Tellegen s theorem
D. Superposition theorem
Answer» D. Superposition theorem
Discussion
58.

For the circuit shown below, C1 = C2 = 2F and the capacitor C1 has a voltage of 20V when S is open. If the switch S is closed at t = 0, the voltage Vc2 will be a

A. Fixed voltage of 20V
B. Fixed voltage of 10V
C. Fixed voltage of 10V
D. Sinusoidal voltage
Answer» E.
Discussion
59.

In a series RLC circuit, the locus of the tip of the admittance phasor in the complex plane as the frequency is varied, is

A. A semicircle in the upper half of the G-B plane having the centre at
B. A circle in the upper half of the G-B plane having the centre at
C. A semicircle in the bottom half of the G-B plane having the centre at
D. A semicircle in the upper half of the G-B plane having the centre at
Answer» D. A semicircle in the upper half of the G-B plane having the centre at
Discussion
60.

Consider the following statements: Superposition theorem is applicable to a linear network in determining
1. The current responses
2. The voltage responses
3. The power responses.
Which of the statements given above are correct?

A. 1 and 2
B. 1, 2 and 3
C. 1 and 3
D. 2 and 3
Answer» B. 1, 2 and 3
Discussion
61.

The voltage V0 shown below is always equal to

A. 11 V
B. 8 V
C. 21 V
D. None of these
Answer» E.
Discussion
62.

Calculate the value of Vx for the circuit given below

A. 3 V
B. 19 V
C. 9 V
D. 19 V
Answer» B. 19 V
Discussion
63.

Find V0 for the circuit given below

A. 10 V
B. 15 V
C. 20 V
D. None of these
Answer» C. 20 V
Discussion
64.

The each branch of circuit graph shown below represent a circuit element. The value of voltage V1 is

A. 30 V
B. 25 V
C. 20 V
D. 15 V
Answer» E.
Discussion
65.

Let i(t) = 3 te 100 t A and V (t) = 0.6 (0.01 t) e 100 t V for the network of fig. shown below. The power being absorbed by the network element at t = 5 ms is

A. 18.4 W
B. 9.2 W
C. 16.6 W
D. 8.3 W
Answer» D. 8.3 W
Discussion
66.

Which one of the following is the
ratio
V24
V13

of the network shown in the given figure

A.
B.
C.
D.
Answer» B.
Discussion
67.

For the circuit given below, the power absorbed by the load RL is

A. 4W
B. 8W
C. 2W
D. None of these
Answer» C. 2W
Discussion
68.

If the switch S in the circuit shown below is opened at t = 0, what are the values of V(0+) and dv / dt (0+), respectively?

A. 100 V, 10,000 V/s
B. 100 V, 10,000 V/s
C. 100 V, 10,000 V/s
D. 100 V, 10,000 V/s
Answer» C. 100 V, 10,000 V/s
Discussion
69.

The ABCD parameters of the 2-port network shown in the figure are

A. <img src="http://images.interviewmania.com/wp-content/uploads/2019/05/197o1.png%20">
B. <img src="http://images.interviewmania.com/wp-content/uploads/2019/05/197o2.png%20">
C. <img src="http://images.interviewmania.com/wp-content/uploads/2019/05/197o3.png%20">
D. <img src="http://images.interviewmania.com/wp-content/uploads/2019/05/197o4.png%20">
Answer» C. <img src="http://images.interviewmania.com/wp-content/uploads/2019/05/197o3.png%20">
Discussion
70.

The ABCD parameters of the 2-port network, shown in the figure are

A. <img src="http://images.interviewmania.com/wp-content/uploads/2019/05/196o1.png%20">
B. <img src="http://images.interviewmania.com/wp-content/uploads/2019/05/196o2.png%20">
C. <img src="http://images.interviewmania.com/wp-content/uploads/2019/05/196o3.png">
D. <img src="http://images.interviewmania.com/wp-content/uploads/2019/05/196o4.png%20">
Answer» B. <img src="http://images.interviewmania.com/wp-content/uploads/2019/05/196o2.png%20">
Discussion
71.

If the switch S in the circuit shown below is opened at t = 0, what are the values of V(0

A. 100 V, 10,000 V/s
B. 100 V, 10,000 V/s
C. 100 V, 10,000 V/s
D. 100 V, 10,000 V/s
Answer» C. 100 V, 10,000 V/s
Discussion
72.

In the circuit shown below, the values of i(0

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
73.

The voltage transfer ratio V2 / V1 in the two port network shown in the figure is

A. 10/12
B. 12/10
C. 1/2
D. 2/3
Answer» C. 1/2
Discussion
74.

For a two-port network the three parameters A, B and C are given by

A. 1 x1
B. 0
C. 2 x1
D. 2 x1
Answer» D. 2 x1
Discussion
75.

In a balanced Wheatstone bridge, if the positions of detector and source are interchanged, the bridge will still remain balanced. This inference can be drawn from

A. reciprocity theorem
B. duality principle
C. compensation theorem
D. equivalance theorem
Answer» B. duality principle
Discussion
76.

Which one of the following combinations of open circuit voltage and Thevenin's equivalent resistance represents the Thevenin's equivalent of the circuit shown below in the figure?

A. 1 V, 10
B. 1 V, 1 k
C. 1 mV, 1 k
D. 1 mV, 10
Answer» B. 1 V, 1 k
Discussion
77.

Determine the Z-parameters of the T-network

A. 5, 8, 12, 0
B. 13, 8, 8, 20
C. 8, 20, 13, 12
D. 5, 8, 8, 12
Answer» C. 8, 20, 13, 12
Discussion
78.

The Resistance R

A. 12
B. 10.8
C. 6.75
D. 9
Answer» E.
Discussion
79.

The condition AD BC = 1 for a two port network implies that the networks is a

A. reciprocal network
B. jumped element network
C. lossless network
D. unilateral element network
Answer» B. jumped element network
Discussion
80.

For a transfer function of a physical two-port network

A. all the zeros must lie only in the left half of S-plane
B. the poles may lie anywhere in the S-plane.
C. the poles lying on the imaginary axis must be simple.
D. All of the above.
Answer» E.
Discussion
81.

In a series RLC circuit excited by a voltage

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
82.

In an unloaded transformer, the fluxes limiting the primary and secondary are 25 mwb and 15 mwb. The coefficient of coupling

A. cannot be calculated
B. <table><tr> <td rowspan="2"> </td> <td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>5</center></td><td rowspan="2"></td></tr><td align="center">3</td></table>
C.
D. <table><tr> <td rowspan="2"> </td> <td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>3</center></td><td rowspan="2"></td></tr><td align="center">5</td></table>
E. 25: 15
Answer» D. <table><tr> <td rowspan="2"> </td> <td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>3</center></td><td rowspan="2"></td></tr><td align="center">5</td></table>
Discussion
83.

An iron core coil with 25 turns has an inductance of 0.625 mH. In order to obtain an inductance of 0.1 mH, the number of turns will have to be changed to

A. 4
B. 10
C. 62.5
D. 157
Answer» E.
Discussion
84.

The rms voltage measured across each of the circuit elements in figure is as shown when the circuit is excited by a sinusoidal voltage sources. The rms value of the source voltage is

A. 21 V
B. 4 V
C. 5 V
D. 1 V
Answer» D. 1 V
Discussion
85.

A series RLC high Q circuit, the current peaks at a frequency

A. is equal to the resonant frequency.
B. is greater than the resonant frequency.
C. is less than the resonant frequency.
D. None of the above is true.
Answer» B. is greater than the resonant frequency.
Discussion
86.

In figure shown A

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
87.

H (s) =
V(s)
 =
(s + 3)
, i(t) in a unit step. V (t) in the steady state is given by
I(s)(s + 2)2

A. <table><tr> <td rowspan="2"></td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center><sub>3</sub></center></td><td rowspan="2"> </td></tr><td align="center">2</td></table>
B. <table><tr> <td rowspan="2"></td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center><sub>3</sub></center></td><td rowspan="2"> </td></tr><td align="center">4</td></table>
C. 1
D. 0
Answer» C. 1
Discussion
88.

In the circuit Vs = 10 cos t. Power drawn by the 2 ohm resistor 4 W. The power factor is

A. 0.3
B. 0.4
C. 0.6
D. 0.8
Answer» D. 0.8
Discussion
89.

Relative to a given fixed tree of a network

A. link currents form an independent set.
B. branch currents form an independent set.
C. link voltage form an independent set.
D. branch voltages form an independent set.
E. A, B and D
Answer» F.
Discussion
90.

The necessary and sufficient condition for a rational a function of s, T (s) to be a driving point impedance of an RC network is that all poles and zeros should be

A. Simple and lie on the negative real axis of the S-plane
B. Complex and lie in the left half of the S-plane
C. Complex and lie in the right half of the S-plane.
D. Simple and lie on the positive real axis of S-plane.
Answer» B. Complex and lie in the left half of the S-plane
Discussion
91.

Two, two-port networks are connected in cascade. The combination is to be represented as a single two-port network. The parameters of the network are obtained by multiplying the individual

A. Z-parameter matrix
B. h-parameter matrix
C. Y-parameter matrix
D. ABCD parameter matrix.
Answer» E.
Discussion
92.

The L.T. of a unit pulse in figure is

A. u (T)
B. <table><tr> <td rowspan="2"></td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center><sub>1 e<sup> Ts</sup></sub></center></td><td rowspan="2"></td></tr><td align="center">s</td></table>
C. 1 e Ts
D. <table><tr> <td rowspan="2"></td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center><sub> e<sup> Ts</sup></sub></center></td><td rowspan="2"></td></tr><td align="center">s + a</td></table>
E.
Answer» C. 1 e Ts
Discussion
93.

A 20 V battery is connected to a 5A current source. The power absorbed by the battery and current source when current enters the positive

A. 100 W, 100 W
B. 100 W, 100 W
C. 100 W, 100 W
D. 100 W, 100 W
Answer» B. 100 W, 100 W
Discussion
94.

For a current of 5 A; what is the voltage across AB?

A. 40 V
B. 60 V
C. 60 V
D. 40 V
Answer» D. 40 V
Discussion
95.

The total power dissipated, the energy stored in the inductor and the energy stored in the capacitor in the circuit shown in figure under steady state condition is

A. 50 W, 25 J, 50 J
B. 50 W, 0, 0
C. 50 W, 12.5 J, 0
D. 50 W, 12.5 J, 25 J
Answer» E.
Discussion
96.

The function of the given figure

A. <img src="http://images.interviewmania.com/wp-content/uploads/2019/05/182o1.png%20">
B. <img src="http://images.interviewmania.com/wp-content/uploads/2019/05/182o2.png%20">
C. <img src="http://images.interviewmania.com/wp-content/uploads/2019/05/182o3.png%20">
D. None of the above
Answer» C. <img src="http://images.interviewmania.com/wp-content/uploads/2019/05/182o3.png%20">
Discussion
97.

The unit step figure of the pulse in given figure is

A. <img src="http://images.interviewmania.com/wp-content/uploads/2019/05/181o1.png">
B. <img src="http://images.interviewmania.com/wp-content/uploads/2019/05/181o2.png%20">
C. <img src="http://images.interviewmania.com/wp-content/uploads/2019/05/181o3.png%20">
D. <img src="http://images.interviewmania.com/wp-content/uploads/2019/05/181o4.png%20">
Answer» C. <img src="http://images.interviewmania.com/wp-content/uploads/2019/05/181o3.png%20">
Discussion
98.

The equation of the waveform in terms of unit step functions can be written as

A. u (t 1) + u (t 2) + u (t 3) + u (t 4) 4 u (t 5)
B. u (t + 1) + 4 (t + 2) + 4 (t + 3) + 4 (t + 4) 4 (t 5)
C. u (t 1) u (t 2) + 44 (t 5)
D. None of the above.
Answer» B. u (t + 1) + 4 (t + 2) + 4 (t + 3) + 4 (t + 4) 4 (t 5)
Discussion
99.

The unit step function of the train of pulse is

A. I = u (t) u (t T) + 2u (t 2T) u (t 3T) + u (t 5T) u (t 6T)
B. I = u (t) + u (t T) + u (t 3T) u (t 5T) + u (t 6T)
C. I = u (t) u (t T) u (t 3T) + u (t 5T) + u (t 6T)
D. None of the above.
Answer» B. I = u (t) + u (t T) + u (t 3T) u (t 5T) + u (t 6T)
Discussion
100.

The waveform shown in the figure is non-recurring. Write an equation for this waveform, V (t)

A. 3r (t) u (t) 3r (t 1) u (t 1) u (t 1) 2 u (t 2)
B. 3r (t) u (t) 3r (t 1) u (t 1) 2 u (t 2)
C. 3r (t) u (t) 3r (t 1) u (t 1) u (t 1)
D. None of the above
Answer» B. 3r (t) u (t) 3r (t 1) u (t 1) 2 u (t 2)
Discussion