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.

501.

Leakage in capacitors is primarily caused by

A. transistors
B. resistors
C. inductors
D. dc motors
Answer» B. resistors
502.

If the thickness of the material increases, what happens to the dielectric strength?

A. increases
B. decreases
C. remains the same
D. becomes zero
Answer» C. remains the same
503.

Which medium has the highest dielectric strength?

A. water
B. mica
C. air
D. glass
Answer» D. glass
504.

If the Voltage increases, what happens to dielectric strength?

A. increases
B. decreases
C. remains the same
D. becomes zero
Answer» B. decreases
505.

The unit for dielectric strength is

A. v/m2
B. mv/m2
C. mv/m
D. vm
Answer» D. vm
506.

Calculate the energy stored in the combination of the capacitors.

A. 192kj
B. 1.92kj
C. 19.2kj
D. 1920j
Answer» D. 1920j
507.

Calculate the energy in the 4F capacitor.

A. 128kj
B. 1.28kj
C. 12.8kj d) 1280j
Answer» D.
508.

Calculate the energy in the 2F capacitor.

A. 8.6kj
B. 64kj
C. 64j
D. 6.4kj
Answer» E.
509.

When do we get maximum energy from a set of capacitors?

A. when they are connected in parallel
B. when they are connected in series
C. both in series and parallel
D. insufficient information provided
Answer» B. when they are connected in series
510.

Energy stored in 2000mF capacitor charged to a potential difference of 10V is?

A. 100j
B. 200j
C. 300j
D. 400j
Answer» B. 200j
511.

Work done in charging a capacitor is

A. qv
B. 1⁄2qv
C. 2qv
D. qv2
Answer» C. 2qv
512.

When a material has zero permittivity, the maximum potential that it can possess is

A. ∞
B. -∞
C. unity
D. zero
Answer» E.
513.

Find the electric field of a potential function given by 20 log x + y at the point (1,1,0).

A. -20 i – j
B. -i -20 j
C. i + j
D. (i + j)/20
Answer» B. -i -20 j
514.

Find the charge density from the function of flux density given by 12x – 7z.

A. 19
B. -5
C. 5
D. -19
Answer» D. -19
515.

Poisson equation can be derived from which of the following equations?

A. point form of gauss law
B. integral form of gauss law
C. point form of ampere law
D. integral form of ampere law
Answer» B. integral form of gauss law
516.

The function V = exsin y + z does not satisfy Laplace equation. State True/False.

A. true
B. false
Answer» C.
517.

Suppose the potential function is a step function. The equation that gets satisfied is

A. laplace equation
B. poisson equation
C. maxwell equation
D. ampere equation
Answer» B. poisson equation
518.

If Laplace equation satisfies, then which of the following statements will be true?

A. potential will be zero
B. current will be infinite
C. resistance will be infinite
D. voltage will be same
Answer» C. resistance will be infinite
519.

In free space, the Poisson equation becomes

A. maxwell equation
B. ampere equation
C. laplace equation
D. steady state equation
Answer» D. steady state equation
520.

The normal component of which quantity is always discontinuous at the boundary?

A. e
B. d
C. h
D. b
Answer» C. h
521.

Find the flux density at the boundary when the charge density is given by 24 units.

A. 12
B. 24
C. 48
D. 96
Answer» C. 48
522.

Find the permittivity of the surface when a wave incident at an angle 60 is reflected by the surface at 45 in air.

A. 1.41
B. 3.5
C. 2.2
D. 1.73
Answer» E.
523.

Find the electric field if the surface density at the boundary of air is 10-9.

A. 12Ï€
B. 24Ï€
C. 36Ï€
D. 48Ï€
Answer» D. 48Ï€
524.

Choose the best definition of dielectric loss.

A. absorption of electric energy by dielectric in an ac field
B. dissipation of electric energy by dielectric in a static field
C. dissipation of heat by dielectric
D. product of loss tangent and relative permittivity
Answer» B. dissipation of electric energy by dielectric in a static field
525.

For a conservative field which of the following equations holds good?

A. ∫ e.dl = 0
B. ∫ h.dl = 0
C. ∫ b.dl = 0
D. ∫ d.dl = 0
Answer» B. ∫ h.dl = 0
526.

The charge within a conductor will be

A. 1
B. -1
C. ∞
Answer» D.
527.

When a dielectric loses its dielectric property, the phenomenon is called

A. dielectric loss
B. dielectric breakdown
C. polarisation
D. magnetization
Answer» C. polarisation
528.

Calculate the loss tangent when the dielectric constant in AC field is given by 3 + 2j.

A. (2/3)
B. (3/2)
C. (-3/2)
D. (-2/3)
Answer» E.
529.

Curie-Weiss law is used to calculate which one of the following?

A. permittivity
B. permeability
C. electric susceptibility
D. magnetic susceptibility
Answer» D. magnetic susceptibility
530.

Curie-Weiss law is applicable to which of the following materials?

A. piezoelectric
B. ferroelectric
C. pyroelectric
D. anti-ferroelectric
Answer» C. pyroelectric
531.

Solids do not have which type of polarisation?

A. ionic
B. orientational
C. interfacial
D. electronic
Answer» D. electronic
532.

Which of the following is not an example of elemental solid dielectric?

A. diamond
B. sulphur
C. silicon
D. germanium
Answer» D. germanium
533.

Compute the refractive index when the dielectric constant is 256 in air.

A. 2562
B. 16 c) 256
C. d) 64
Answer» C. d) 64
534.

The total polarisation of a material is the

A. product of all types of polarisation
B. sum of all types of polarisation
C. orientation directions of the dipoles
D. total dipole moments in the material
Answer» C. orientation directions of the dipoles
535.

In the given types of polarisation, which type exists in the semiconductor?

A. electronic
B. ionic
C. orientational
D. interfacial or space charge
Answer» E.
536.

Identify which type of polarisation depends on temperature.

A. electronic
B. ionic
C. orientational
D. interfacial
Answer» D. interfacial
537.

Polarizability is defined as the

A. product of dipole moment and electric field
B. ratio of dipole moment to electric field
C. ratio of electric field to dipole moment
D. product of dielectric constant and dipole moment
Answer» C. ratio of electric field to dipole moment
538.

The best definition of polarisation is

A. orientation of dipoles in random direction
B. electric dipole moment per unit volume
C. orientation of dipole moments
D. change in polarity of every dipole
Answer» C. orientation of dipole moments
539.

Find the mean free path of an electron travelling at a speed of 18m/s in 2 seconds.

A. 9
B. 36 c) 0.11 d) 4.5
Answer» C.
540.

The superconducting materials will be independent of which of the following?

A. magnetic field
B. electric field
C. magnetization
D. temperature
Answer» C. magnetization
541.

The magnetic susceptibility in a superconductor will be

A. positive
B. negative
C. zero
D. infinity
Answer» C. zero
542.

he magnetic field which destroys the superconductivity is called

A. diamagnetic field
B. ferromagnetic field
C. ferrimagnetic field
D. critical field
Answer» E.
543.

For a dielectric which of the following properties hold good?

A. they are superconductors at high temperatures
B. they are superconductors at low temperatures
C. they can never become a superconductor
D. they have very less dielectric breakdown voltage
Answer» C. they can never become a superconductor
544.

Find the dielectric constant for a material with electric susceptibility of 4.

A. 3
B. 5
C. 8
D. 16
Answer» C. 8
545.

A dielectric can be made a conductor by

A. compression
B. heating
C. doping
D. freezing
Answer» C. doping
546.

Identify a good dielectric.

A. iron
B. ceramics
C. plastic
D. magnesium
Answer» C. plastic
547.

The current flowing through an insulating medium is called

A. conduction
B. convection
C. radiation
D. susceptibility
Answer» C. radiation
548.

For conductors, the free electrons will exist at

A. valence band
B. middle of valence and conduction band
C. will not exist
D. conduction band
Answer» E.
549.

Alternating current measured in a transmission line will be

A. peak value
B. average value
C. rms value
D. zero
Answer» D. zero
550.

The current in a metal at any frequency is due to

A. conduction current
B. displacement current
C. both conduction and displacement current
D. neither conduction nor displacement current
Answer» B. displacement current