Explore topic-wise MCQs in Electrical Engineering.

This section includes 19 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering knowledge and support exam preparation. Choose a topic below to get started.

1.

Voltage applied across a ceramic dielectric produces an electrolytic field 100 times greater than air. What will be the value of dielectric constant ?

A. 50
B. 100
C. 150
D. 200
Answer» C. 150
2.

"The total electric flux through any closed surface surrounding charges is equal to the amount oflcharge enclosed". The above statement is associated with

A. Coulomb's square law
B. Gauss's law
C. Maxwell's first law
D. Maxwell's second law
Answer» C. Maxwell's first law
3.

The time constant of an R-C circuit is defined as the time during which capacitor charging voltage actually rises to ______ percent of its______value.

A. 37, initial
B. 63.2, initial
C. 63.2, final
D. 37, final
Answer» D. 37, final
4.

While comparing magnetic and electric circuits, the flux of magnetic circuit is compared with which parameter of electrical circuit ?

A. E.m.f.
B. Current
C. Current density
D. Conductivity
Answer» C. Current density
5.

A rectangular magnet of magnetic moment M is cut into two piece of same length, the magnetic moment of each piece will be

A. M
B. M/2
C. 2 M
D. M/4
Answer» C. 2 M
6.

The self-inductance of the coil may be defined as equal to the e.m.f. induced in volts when the current in the circuit changes at the rate of unit weber turns.

A. Yes
B. No
C. none
D. none
Answer» C. none
7.

A conductor 2 metres long moves at right angles to a magnetic field of flux density 1 tesla with a velocity of 12.5 m/s. The induced e.m.f. in the conductor will be

A. 10 V
B. 15 V
C. 25V
D. 50V
Answer» D. 50V
8.

The polarity of the induced voltage can be determined by using the left-hand generator rule.

A. Yes
B. No
C. none
D. none
Answer» B. No
9.

Two infinite parallel plates 10 mm apart have maintained between them a potential difference of 100 V. The acceleration of an electron placed between them is

A. 0.56 x 1015 m/s2
B. 1.5 x 1015 m/s2
C. 1.6 x 1015 m/s2
D. 1.76 x 1015 m/s2
Answer» E.
10.

The initial rate of rise of current through a coil of inductance 10 H when suddenly connected to a D.C. supply of 200 V is_______Vs

A. 50
B. 20
C. 0.05
D. 500
Answer» C. 0.05
11.

The core of a coil has a length of 200 mm. The inductance of coil is 6 mH. If the core length is doubled, all other quantities, remaining the same, the in ductance will be

A. 3 mH
B. 12 mH
C. 24mH
D. 48mH
Answer» B. 12 mH
12.

Those materials are well suited for making permanent magnets which have______retentivity and _______coercivity.

A. low, high
B. high, high
C. high, low
D. low, low
Answer» C. high, low
13.

Those magnetic materials are best suited for making armature and transformer cores which have____permeability and_______hystersis loss.

A. high, high
B. low, high
C. high, low
D. low, low
Answer» D. low, low
14.

"The surface integral of the normal component of the electric displacement D over any closed surface equals the charge enclosed by the surface". The above statement is associated with

A. Gauss's law
B. Kirchhoff s law
C. Faraday's law
D. Lenz's law
Answer» B. Kirchhoff s law
15.

As per Faraday's laws of electromagnetic induction, an e.m.f. is induced in a conductor whenever it

A. lies perpendicular to the magnetic flux
B. lies in a magnetic field
C. cuts magnetic flux
D. moves parallel to the direction of the magnetic field
Answer» D. moves parallel to the direction of the magnetic field
16.

When a conductor moves in the field, so that it makes an angle 8 with the lines of flux, the force F is given as : F = Bl sin2 0.

A. Yes
B. No
C. none
D. none
Answer» C. none
17.

The number of Faraday tubes of flux passing through a surface in an electric field is called

A. electric flux
B. electric flux density
C. magnetic flux density
D. electric charge density
Answer» B. electric flux density
18.

at a point may be defined as equal to the lines of force passing normally through a unit cross section at that point.

A. Electric intensity
B. Magnetic flux density
C. Electric flux
D. None of the above
Answer» B. Magnetic flux density
19.

The time constant and R-C circuit may also be defined as the time during which the charging current falls to ______ percent of its initial maximum value,

A. 37
B. 42
C. 63
D. 73
Answer» B. 42