MCQOPTIONS

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.	12, 1 H inductors are used as edge to form a cube. The inductance between two diagonally opposite corners of the cube is ____________
A.	\(\frac{5}{6}\) H
B.	\(\frac{10}{6}\) H
C.	2 H
D.	\(\frac{3}{2}\) H
Answer» B. \(\frac{10}{6}\) H

2.	The discharge of a capacitor through a ballistic galvanometer produces a damped frequency of 0.125 Hz and successive swings of 120, 96 and 76.8 mm. The logarithmic decrement is?
A.	0.225
B.	0.565
C.	0.484
D.	0.7887
Answer» B. 0.565

3.	A rectifier type AC voltmeter consists of a series resistance R, an ideal full-wave rectifier bridge and a PMMC instrument. A DC current of 1 mA produces a full-scale deflection of the instrument. The resistance of the instrument is 100 Ω. A voltage of 100 V (rms) is applied to the input terminals. The value of R required is?
A.	63.56 Ω
B.	89.83 Ω
C.	89.83 kΩ
D.	141.3 kΩ
Answer» D. 141.3 kΩ

4.	A current I given by I = – 8 + 6\(\sqrt{2}\) (sin (ωt + 30°)) A is passed through three meters. The respective readings (in ampere) will be?
A.	8, 6 and 10
B.	8, 6 and 8
C.	– 8, 10 and 10
D.	-8, 2 and 2
E.	will be?a) 8, 6 and 10b) 8, 6 and 8c) – 8, 10 and 10d) -8, 2 and 2
Answer» D. -8, 2 and 2

5.	A 10 V is connected across a load whose V-I characteristics is given by 7I = V2 + 2V. The internal resistance of the battery is of magnitude 1Ω. The current delivered by the battery is ____________
A.	6 A
B.	5 A
C.	7 A
D.	8 A
Answer» C. 7 A

6.	In the circuit given below, the value of ZL for maximum power to be transferred is _____________
A.	R
B.	R + jωL
C.	R – jωL
D.	jωL
Answer» D. jωL

7.	A relay coil having voltage of magnitude 210 V and frequency 50 Hz is connected to a 210 V, 50 Hz supply. If it has resistance of 50 Ω and an inductance of 0.2 H, the apparent power is _____________
A.	549.39 VA
B.	275.6 VA
C.	157 VA
D.	187 VA
Answer» B. 275.6 VA

8.	An inductive coil connected to a 200 V, 50 Hz AC supply with 10 A current flowing through it dissipates 1000 W. The value of the impedance Z and Reactance XL are respectively ____________
A.	10 Ω and 15 Ω
B.	20 Ω and 17.3 Ω
C.	17.3 Ω and 20 Ω
D.	15 Ω and 10 Ω
Answer» C. 17.3 Ω and 20 Ω

9.	An inductive coil connected to a 200 V, 50 Hz AC supply with 10 A current flowing through it dissipates 1000 W. Which of the following will have least value?
A.	Resistance R
B.	Reactance XL
C.	Impedance Z
D.	Reactance XC
Answer» B. Reactance XL

10.	A voltage having the waveform of a sine curve is applied across a capacitor. When the frequency of the voltage is increased, what happens to the current through the capacitor?
A.	Increases
B.	Decreases
C.	Remains same
D.	Is zero
Answer» B. Decreases

11.	A periodic rectangular signal X (t) has the waveform as shown below. The frequency of the fifth harmonic of its spectrum is ______________
A.	40 Hz
B.	200 Hz
C.	250 Hz
D.	1250 Hz
Answer» E.

12.	In the circuit given below, the current source is 1∠0° A, R = 1 Ω, the impedances are ZC = -j Ω and ZL = 2j Ω. The Thevenin equivalent looking across A-B is __________
A.	\(\sqrt{2}\)∠0 V, (1+2j) Ω
B.	2∠45° V, (1-2j) Ω
C.	2∠45° V, (1+j) Ω
D.	\(\sqrt{2}\)∠45° V, (1+j) Ω
Answer» E.

13.	In the circuit given below, the value of Z which would cause parallel resonance at 500 Hz is ___________
A.	125 mH
B.	34.20 μF
C.	2 μF
D.	0.05 μF
Answer» E.

14.	In the circuit given below, Z1 = 10∠-60°, Z2 = 10∠60°, Z3 = 50∠53.13°. The Thevenin impedance as seen from A-B is _____________
A.	56.5∠45°
B.	60∠30°
C.	70∠30°
D.	34.4∠65°
Answer» B. 60∠30°

15.	A voltage waveform V (t) = 12t2 is applied across a 1 H inductor for t≥0, with initial current through it being 0. The current through the inductor for t greater than 0 is ___________
A.	12t
B.	24t
C.	12t3
D.	4t3
Answer» E.