Explore topic-wise MCQs in Electrical Engineering.

This section includes 682 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering knowledge and support exam preparation. Choose a topic below to get started.

151.

In which of the following forms can Maxwell’s equation not be represented?

A. static
B. differential
C. integral
D. harmonic
Answer» B. differential
Discussion
152.

Find the Maxwell law derived from Ampere law.

A. div(i) = h
B. div(h) = j
C. curl(h) = j
D. curl(b) = d
Answer» D. curl(b) = d
Discussion
153.

Find the Maxwell equation derived from Faraday’s law.

A. div(h) = j
B. div(d) = i
C. curl(e) = -db/dt
D. curl(b) = -dh/dt
Answer» D. curl(b) = -dh/dt
Discussion
154.

Find the charge density when the electric flux density is given by 2x i + 3y j + 4z k.

A. 10
B. 9
C. 24
Answer» C. 24
Discussion
155.

The divergence of which quantity will be zero?

A. e
B. d
C. h
D. b
Answer» E.
Discussion
156.

When the conduction current density and displacement current density are same, the dissipation factor will be

A. zero
B. minimum
C. maximum
D. unity
Answer» E.
Discussion
157.

Find the force due to a current element of length 2cm and flux density of 12 tesla. The current through the element will be 5A.

A. 1 n
B. 1.2 n
C. 1.4 n
D. 1.6 n
Answer» C. 1.4 n
Discussion
158.

According to Faraday’s law, EMF stands for

A. electromagnetic field
B. electromagnetic force
C. electromagnetic friction
D. electromotive force
Answer» E.
Discussion
159.

Find the displacement current when the flux density is given by t3 at 2 seconds.

A. 3
B. 6
C. 12
D. 27
Answer» D. 27
Discussion
160.

For time varying currents, the field or waves will be

A. electrostatic
B. magneto static
C. electromagnetic
D. electrical
Answer» D. electrical
Discussion
161.

The open circuit line will have a reflection coefficient of

A. 0
B. 1
C. -1
D. ∞
Answer» C. -1
Discussion
162.

The radius of the point having a normalised resistance of 1 ohm is

A. 1
B. 0.2
C. 0.5
D. 0.25
Answer» D. 0.25
Discussion
163.

The normalised load impedance of the transmission line 50 ohm with a load of 30 ohm is

A. 30
B. 150
C. 5/3
D. 3/5
Answer» E.
Discussion
164.

The centre of the point having a normalised resistance of 1.2 ohm and reactance of 1.5 ohm is

A. (0.54,0)
B. (0.45,0)
C. (0.36,0)
D. (0.78,0)
Answer» B. (0.45,0)
Discussion
165.

Moving towards the clockwise direction in the Smith chart implies moving

A. towards generator
B. towards load
C. towards stub
D. towards waveguide
Answer» B. towards load
Discussion
166.

The circles in the Smith chart pass through which point?

A. (0,1)
B. (0,-1)
C. (-1,0)
D. (1,0)
Answer» E.
Discussion
167.

The Smith chart consists of the

A. constant r and variable x circles
B. variable r and constant x circles
C. constant r and constant x circles
D. variable r and variable x circles
Answer» D. variable r and variable x circles
Discussion
168.

The Smith chart is a polar chart which plots

A. r vs z
B. r vs znorm
C. t vs z
D. t vs znorm
Answer» C. t vs z
Discussion
169.

For R= 20 ohm and G= 0.8 mho, the attenuation constant will be

A. 16
B. 4
C. 2
D. 32
Answer» B. 4
Discussion
170.

Given that R = 20 ohm, L = 40 mH, C = 40 μF, G = 0.02 mho. Find whether the line is distortionless or not.

A. distorted line
B. distortionless line
C. all of the mentioned
D. none of the mentioned
Answer» C. all of the mentioned
Discussion
171.

The condition that holds good in a distortionless transmission line is

A. r/l = g/c
B. rl = gc
C. l/r = c/g
D. rg/lc
Answer» B. rl = gc
Discussion
172.

The attenuation constant is measured in the units of

A. ohm
B. neper
C. decibel
D. radian/sec
Answer» C. decibel
Discussion
173.

The resistance of a lossless transmission line is

A. 0
B. 1
C. -1
D. infinity
Answer» B. 1
Discussion
174.

The transmission line is said to be lossless when the

A. conductor is perfect and dielectric is lossless
B. conductor is perfect and dielectric is lossy
C. conductor is imperfect and dielectric is lossy
D. conductor is imperfect and dielectric is lossless
Answer» B. conductor is perfect and dielectric is lossy
Discussion
175.

The coaxial cable consists of

A. conductors
B. dielectric
C. conductor with dielectric
D. two conductors with dielectric
Answer» E.
Discussion
176.

The skin depth of the wave having a frequency of 3MHz and a velocity of 12 m/s is

A. 2
B. 3
C. 4
D. 6
Answer» D. 6
Discussion
177.

The relation between the skin depth and frequency is given by

A. skin depth α f
B. skin depth α 1/f
C. skin depth α √f
D. skin depth α 1/√f
Answer» E.
Discussion
178.

The attenuation constant is 0.5 units. The skin depth will be

A. 0.5
B. 0.25
C. 2
D. 4
Answer» D. 4
Discussion
179.

The skin depth is measured in

A. meter
B. millimetre
C. centimetre
D. micrometer
Answer» E.
Discussion
180.

The skin effect is a phenomenon observed in

A. insulators
B. dielectrics
C. conductors
D. semiconductors
Answer» D. semiconductors
Discussion
181.

The intrinsic impedance in free space is

A. 60Ï€
B. 12Ï€
C. 6Ï€
D. 120Ï€
Answer» E.
Discussion
182.

The intrinsic impedance of a wave with electric and magnetic field of 10 and 8 respectively is

A. 1.6
B. 1.11
C. 1.25
D. 0.8
Answer» C. 1.25
Discussion
183.

The transmission coefficient is given by 0.65. Find the return loss of the wave.

A. 9.11
B. 1.99
C. 1.19
D. 9.91
Answer» B. 1.99
Discussion
184.

The power of the electromagnetic wave with electric and magnetic field intensities given by 12 and 15 respectively is

A. 180
B. 90
C. 45
D. 120
Answer» C. 45
Discussion
185.

The standing wave ratio of short circuited and open circuited lines will be

A. 0
B. 1
C. -1
D. ∞
Answer» E.
Discussion
186.

The minimum impedance of a 75 ohm transmission line with a SWR of 2.5 is

A. 100
B. 50
C. 25
D. 30
Answer» E.
Discussion
187.

The current reflection coefficient of a line with voltage reflection coefficient of 0.65 is given by

A. 0
B. 0.65
C. -0.65
D. 0.35
Answer» D. 0.35
Discussion
188.

The maximum impedance of a 50 ohm transmission line with SWR of 3 is

A. 50/3
B. 3/50
C. 150
D. 450
Answer» D. 450
Discussion
189.

For matched line, the standing wave ratio will be

A. 0
B. ∞
C. -1
D. 1
Answer» E.
Discussion
190.

The range of the standing wave ratio is

A. 0 < s < 1
B. -1 < s < 1
C. 1 < s < ∞
D. 0 < s < ∞
Answer» D. 0 < s < ∞
Discussion
191.

Find the reflection coefficient of the wave with SWR of 3.5.

A. 0.55
B. 0.23
C. 0.48
D. 0.68
Answer» B. 0.23
Discussion
192.

Find the standing wave ratio, when a load impedance of 250 ohm is connected to a 75 ohm line.

A. 0.3
B. 75
C. 250
D. 3.33
Answer» E.
Discussion
193.

Given that the reflection coefficient is 0.6. Find the SWR.

A. 2
B. 4
C. 6
D. 8
Answer» C. 6
Discussion
194.

Standing wave ratio is defined as the

A. ratio of voltage maxima to voltage minima
B. ratio of current maxima to current minima
C. product of voltage maxima and voltage minima
D. product of current maxima and current minima
Answer» B. ratio of current maxima to current minima
Discussion
195.

The maxima and minima voltage of the standing wave are 6 and 2 respectively. The standing wave ratio is

A. 2
B. 3
C. 1/2
D. 4
Answer» C. 1/2
Discussion
196.

Standing waves occurs due to

A. impedance match
B. impedance mismatch
C. reflection
D. transmission
Answer» C. reflection
Discussion
197.

In matched line, the transmission coefficient is

A. 0
B. 1
C. -1
D. infinity
Answer» C. -1
Discussion
198.

The reflection coefficient of a transmission line having characteristic and load impedances as 50 and 30 ohm respectively is

A. 1/4
B. 1/8
C. 1/2
D. 3/4
Answer» B. 1/8
Discussion
199.

The transmission coefficient in a wave travelling through two media having permittivities 4 and 1 is

A. 1/4
B. 3/2
C. 3/4
D. 2/3
Answer» E.
Discussion
200.

The transmission coefficient in a wave travelling through two media having intrinsic impedances of 5.5 and 1.33 is

A. 0.389
B. 0.55
C. 0.133
D. 0.42
Answer» B. 0.55
Discussion