Explore topic-wise MCQs in Electrical Engineering.

This section includes 56 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.

Conductivity is analogous to

A. etentivity
B. esistivity
C. ermeability
D. nductance
Answer» D. nductance
2.

The property of a material which opposes the creation of magnetic flux in it is known as

A. eluctivity
B. agneto-motive force
C. ermeance
D. eluctance
Answer» E.
3.

The rate of rise of current through an inductive coil is maximum

A. t 63.2% of its maximum steady value
B. t the start of the current flow
C. fter one time constant
D. ear the final maximum value of current
Answer» C. fter one time constant
4.

Hysteresis loss least depends on

A. olume of material
B. requency
C. teinmetz’s coefficient of material
D. mbient temperature
Answer» E.
5.

The unit of reluctance is

A. eter/Henry
B. enry/meter
C. enry
D. /Henry
Answer» E.
6.

Hard steel is suitable for making permanent magnets because

A. t has good residual magnetism
B. ts hysteresis loop has large area
C. ts mechanical strength is high
D. ts mechanical strength is low
Answer» B. ts hysteresis loop has large area
7.

Reciprocal of reluctance is

A. eluctivity
B. ermeance
C. ermeability
D. usceptibility
Answer» C. ermeability
8.

A material for good magnetic memory should have

A. ow hysteresis loss
B. igh permeability
C. ow retentivity
D. igh retentivity
Answer» E.
9.

Permanent magnets are normally made of

A. lnico alloys
B. luminium
C. ast iron
D. rought iron
Answer» B. luminium
10.

Conductance is analogous to

A. ermeance
B. eluctance
C. lux
D. nductance
Answer» B. eluctance
11.

An air gap is usually inserted in magnetic circuits to

A. ncrease m.m.f.
B. ncrease the flux
C. revent saturation
D. one of the above
Answer» D. one of the above
12.

The unit of retentivity is

A. eber
B. eber/sq. m
C. mpere turn/meter
D. mpere turns
Answer» C. mpere turn/meter
13.

Silicon steel is used in electrical machines because it has

A. ow coercivity
B. ow retentivity
C. ow hysteresis loss
D. igh coercivity
Answer» D. igh coercivity
14.

In a magnetic material hysteresis loss takes place primarily due to

A. apid reversals of its magnetization
B. lux density lagging behind magnetizing force
C. olecular friction
D. t high retentivity
Answer» E.
15.

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. 0
B. 0
C. 0.05
D. 00
Answer» C. 0.05
16.

Laminated cores, in electrical machines, are used to reduce

A. opper loss
B. ddy current loss
C. ysteresis loss
D. ll of the above
Answer» C. ysteresis loss
17.

Energy stored by a coil is doubled when its current is increased by percent.

A. 25
B. 50.14
C. 41.4
D. 100
Answer» D. 100
18.

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
19.

Permeability in a magnetic circuit corresponds to_________ in an electric circuit.

A. Resistance
B. Resistivity
C. Conductivity
D. Conductance
Answer» D. Conductance
20.

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
21.

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
22.

Conductivity is analogous to%!

A. Retentivity
B. Resistivity
C. Permeability
D. Inductance
Answer» D. Inductance
23.

The property of a material which opposes the creation of magnetic flux in it is known as%!

A. Reluctivity
B. Magneto-motive force
C. Permeance
D. Reluctance
Answer» E.
24.

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
25.

Permeability in a magnetic circuit corresponds to_________ in an electric circuit.%!

A. Resistance
B. Resistivity
C. Conductivity
D. Conductance
Answer» D. Conductance
26.

Reciprocal of reluctance is%!

A. Reluctivity
B. Permeance
C. Permeability
D. Susceptibility
Answer» C. Permeability
27.

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
28.

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
29.

*$_Reciprocal of reluctance is?

A. Reluctivity
B. Permeance
C. Permeability
D. Susceptibility
Answer» C. Permeability
30.

*$_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
31.

*$_Permeability in a magnetic circuit corresponds to_________ in an electric circuit.?

A. Resistance
B. Resistivity
C. Conductivity
D. Conductance
Answer» D. Conductance
32.

*$_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
33.

*/*_In a magnetic material hysteresis loss takes place primarily due to?

A. Rapid reversals of its magnetization
B. Flux density lagging behind magnetizing force
C. Molecular friction
D. It high retentivity
Answer» E.
34.

*/*_A material for good magnetic memory should have?

A. Low hysteresis loss
B. High permeability
C. Low retentivity
D. High retentivity
Answer» E.
35.

*/*_The unit of retentivity is?

A. Weber
B. Weber/sq. m
C. Ampere turn/meter
D. Ampere turns
Answer» C. Ampere turn/meter
36.

*/*_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
37.

%_A material for good magnetic memory should have_%

A. Low hysteresis loss
B. High permeability
C. Low retentivity
D. High retentivity
Answer» E.
38.

%_The unit of retentivity is_%

A. Weber
B. Weber/sq. m
C. Ampere turn/meter
D. Ampere turns
Answer» C. Ampere turn/meter
39.

%_In a magnetic material hysteresis loss takes place primarily due to_%

A. Rapid reversals of its magnetization
B. Flux density lagging behind magnetizing force
C. Molecular friction
D. It high retentivity
Answer» E.
40.

_ 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
41.

_Permanent magnets are normally made of$?

A. Alnico alloys
B. Aluminium
C. Cast iron
D. Wrought iron
Answer» B. Aluminium
42.

_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
43.

_Relative permeability of vacuum is$?

A. 1
B. 1 H/m
C. 1/4JI
D. 4n √ó 10' H/m
Answer» B. 1 H/m
44.

_The unit of magnetic flux is$?

A. Henry
B. Weber
C. Ampere-turn/weber
D. Ampere/metre
Answer» C. Ampere-turn/weber
45.

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
46.

Conductance is analogous to$?

A. Permeance
B. Reluctance
C. Flux
D. Inductance
Answer» B. Reluctance
47.

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
48.

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
49.

Conductance is analogous to?

A. Permeance
B. Reluctance
C. Flux
D. Inductance
Answer» B. Reluctance
50.

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