Explore topic-wise MCQs in Network Theory.

This section includes 15 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.

A rectangular voltage wave of magnitude A and duration B is applied to a series combination of resistance R and capacitance C. The voltage developed across the capacitor is ____________

A. A[1 – exp(-\(\frac{B}{RC}\))]
B. \(\frac{AB}{RC}\)
C. A
D. A exp(-\(\frac{B}{RC}\))
Answer» B. \(\frac{AB}{RC}\)
Discussion
2.

In the circuit given below, the switch is closed at time t=0. The voltage across the inductance just at t=0+ is ____________

A. 2 V
B. 4 V
C. -6 V
D. 8 V
Answer» C. -6 V
Discussion
3.

In the circuit given below, the capacitor initially has a charge of 10 C. The current in the circuit at t=1 sec after the switch S is closed will be ___________

A. 14.7 A
B. 18.5 A
C. 40 A
D. 50 A
Answer» B. 18.5 A
Discussion
4.

In the figure given below, what is the RMS value of the periodic waveform?

A. 2\(\sqrt{6}\) A
B. 6\(\sqrt{2}\) A
C. \(\sqrt{\frac{4}{3}}\) A
D. 1.5 A
Answer» B. 6\(\sqrt{2}\) A
Discussion
5.

An ideal capacitor is charged to a voltage VO and connected at t=0 across an ideal inductor L. If ω = \(\frac{1}{\sqrt{LC}}\), the voltage across the capacitor at time t>0 is ____________

A. VO
B. VO cos(ωt)
C. VO sin(ωt)
D. VO e-ωtcos(ωt)
Answer» C. VO sin(ωt)
Discussion
6.

In the circuit given below, the switch S1 is initially closed and S2 is opened. The inductor L carries a current of 10A and the capacitor is charged to 10 V with polarities as shown. The current through L during t=0+ is _____________

A. 55 A
B. 5.5 A
C. 45 A
D. 4.5 A
Answer» B. 5.5 A
Discussion
7.

In the circuit given below, the switch S1 is initially closed and S2 is opened. The inductor L carries a current of 10A and the capacitor is charged to 10 V with polarities as shown. The current through C during t=0+ is _____________

A. 55 A
B. 5.5 A
C. 45 A
D. 4.5 A
Answer» E.
Discussion
8.

In the circuit given below, for time t

A. 1 V
B. 2 V
C. 1.5 V
D. 3 V
Answer» E.
Discussion
9.

For a unit step signal u (t), the response is V1 (t) = (1-e-3t) for t>0. If a signal 3u (t) + δ(t) is applied, the response will be (considering zero initial conditions)?

A. (3-6e-3t)u(t)
B. (3-3e-3t)u(t)
C. 3u(t)
D. (3+3e-3t)u(t)
Answer» D. (3+3e-3t)u(t)
Discussion
10.

Initial voltage on capacitor VO as marked |VO| = 5 V, VS = 8 u (t), where u (t) is the unit step. The voltage marked V at t=0+ is _____________

A. 1 V
B. -1 V
C. \(\frac{13}{3}\) V
D. –\(\frac{13}{3}\) V
Answer» D. –\(\frac{13}{3}\) V
Discussion
11.

In the circuit shown below the current I(t) for t≥0+ (assuming zero initial conditions) is ___________

A. 0.5-0.125e-1000t A
B. 1.5-0.125e-1000t A
C. 0.5-0.5e-1000t A
D. 0.375e-1000t A
Answer» B. 1.5-0.125e-1000t A
Discussion
12.

In the circuit shown, the voltage source supplies power which is _____________

A. Zero
B. 5 W
C. 10 W
D. 100 W
Answer» B. 5 W
Discussion
13.

The switch in the circuit shown was on position X for a long time. The switch is then moved to position Y at time t=0. The current I(t) for t>0 is ________

A. 0.2e-125tu(t) mA
B. 20e-1250tu(t) mA
C. 0.2e-1250tu(t) mA
D. 20e-1000tu(t) mA
Answer» D. 20e-1000tu(t) mA
Discussion
14.

In the circuit given below, the input impedance ZIN of the circuit is _________

A. 0.52 – j4.30 Ω
B. 0.52 + j15.70 Ω
C. 64.73 + j17.77 Ω
D. 0.3 – j33.66 Ω
Answer» D. 0.3 – j33.66 Ω
Discussion
15.

A series RLC circuit has a resonance frequency of 1 kHz and a quality factor Q = 100. If each of R, L and C is doubled from its original value, the new Q of the circuit is _____________

A. 25
B. 50
C. 100
D. 200
Answer» C. 100
Discussion