Explore topic-wise MCQs in Electrical Engineering Questions.

This section includes 28 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering Questions knowledge and support exam preparation. Choose a topic below to get started.

1.

If the area of hysteresis loop of a material is large, the hysteresis loss in this material will be____________?
A. zero
B. small
C. large
D. none of the above
Answer» D. none of the above
Discussion
2.

The rate of rise of current through an inductive coil is maximum_____________?
A. at 63.2% of its maximum steady value
B. at the start of the current flow
C. after one time constant
D. near the final maximum value of current
Answer» C. after one time constant
Discussion
3.

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
Discussion
4.

A material for good magnetic memory should have____________?
A. low hysteresis loss
B. high permeability
C. low retentivity
D. high retentivity
Answer» E.
Discussion
5.

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
Discussion
6.

Permanent magnets are normally made of_____________?
A. alnico alloys
B. aluminium
C. cast iron
D. wrought iron
Answer» B. aluminium
Discussion
7.

The unit of magnetic flux is______________?
A. henry
B. weber
C. ampereturn/weber
D. ampere/metre
Answer» C. ampereturn/weber
Discussion
8.

Point out the wrong statement. Magnetic leakage is undesirable in electric machines because it___________?
A. lowers their power efficiency
B. increases their cost of manufacture
C. leads to their increased weight
D. produces fringing
Answer» B. increases their cost of manufacture
Discussion
9.

An air gap is usually inserted in magnetic circuits to____________?
A. increase m.m.f.
B. increase the flux
C. prevent saturation
D. none of the above
Answer» D. none of the above
Discussion
10.

Hard steel is suitable for making permanent magnets because_____________?
A. it has good residual magnetism
B. its hysteresis loop has large area
C. its mechanical strength is high
D. its mechanical strength is low
Answer» B. its hysteresis loop has large area
Discussion
11.

Hysteresis loss least depends on____________?
A. volume of material
B. frequency
C. steinmetz coefficient of material
D. ambient temperature
Answer» E.
Discussion
12.

The unit of reluctance is_____________?
A. metre/henry
B. henry/metre
C. henry
D. 1/henry
Answer» E.
Discussion
13.

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
Discussion
14.

Reciprocal of reluctance is_______________?
A. reluctivity
B. permeance
C. permeability
D. susceptibility
Answer» C. permeability
Discussion
15.

A ferrite core has less eddy current loss than an iron core because_______________?
A. ferrites have high resistance
B. ferrites are magnetic
C. ferrites have low permeability
D. ferrites have high hysteresis
Answer» B. ferrites are magnetic
Discussion
16.

Laminated cores, in electrical machines, are used to reduce____________?
A. copper loss
B. eddy current loss
C. hysteresis loss
D. all of the above
Answer» C. hysteresis loss
Discussion
17.

Silicon steel is used in electrical machines because it has_____________?
A. low coercivity
B. low retentivity
C. low hysteresis loss
D. high coercivity
Answer» D. high coercivity
Discussion
18.

The property of a material which opposes the creation of magnetic flux in it is known as_____________?
A. reluctivity
B. magnetomotive force
C. permeance
D. reluctance
Answer» E.
Discussion
19.

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
Discussion
20.

The relative permeability of a ferromagnetic material is_____________?
A. less than one
B. more than one
C. more than 10
D. more than 100 or 1000
Answer» E.
Discussion
21.

Relative permeability of vacuum is__________?
A. 1
B. 1 H/m
C. 1/4JI
D. 4n x 10-‘ H/m
Answer» B. 1 H/m
Discussion
22.

Permeability in a magnetic circuit corresponds to________ in an electric circuit
A. resistance
B. resistivity
C. conductivity
D. conductance
Answer» D. conductance
Discussion
23.

Conductivity is analogous to____________?
A. retentivity
B. resistivity
C. permeability
D. inductance
Answer» D. inductance
Discussion
24.

When both the inductance and resistance of a coil are doubled the value of________________?
A. time constant remains unchanged
B. initial rate of rise of current is doubled
C. final steady current is doubled
D. time constant is halved
Answer» B. initial rate of rise of current is doubled
Discussion
25.

Energy stored by a coil is doubled when its current is increased by percent___________?
A. 25
B. 50
C. 41.4
D. 100
Answer» D. 100
Discussion
26.

The unit of retentivity is____________?
A. weber
B. weber/sq. m
C. ampere turn/meter
D. ampere turn
Answer» C. ampere turn/meter
Discussion
27.

Conductance is analogous to_____________?
A. permeance
B. reluctance
C. flux
D. inductance
Answer» B. reluctance
Discussion
28.

In a magnetic material hysteresis loss takes place primarily due to___________?
A. rapid reversals of its magnetisation
B. flux density lagging behind magnetising force
C. molecular friction
D. it high retentivity
Answer» E.
Discussion