Magnetic Circuits Mcqs

This set of Electrical engineering Multiple Choice Questions & Answers (MCQs) focuses on study of “Magnetic Circuits ”. These questions are chosen from a collection of most authoritative and best reference books on Electrical engineering. Our aim is to prepare an individual for competitive exams like NTS, GAT, ECAT, University and College entrance exams, Jobs and interviews. One should practice our MCQS to assimilate Magnetic Circuits comprehensively.

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1.
Hysteresis loss least depends on____________?

Volume of material

Frequency

Steinmetz coefficient of material

Ambient temperature

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4.
The property of a material which opposes the creation of magnetic flux in it is known as_____________?

Reluctivity

Magnetomotive force

Permeance

Reluctance

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5.
Silicon steel is used in electrical machines because it has_____________?

Low coercivity

Low retentivity

Low hysteresis loss

High coercivity

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6.
A ferrite core has less eddy current loss than an iron core because_______________?

Ferrites have high resistance

Ferrites are magnetic

Ferrites have low permeability

Ferrites have high hysteresis

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7.
Laminated cores, in electrical machines, are used to reduce____________?

Copper loss

Eddy current loss

Hysteresis loss

All of the above

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8.
While comparing magnetic and electric circuits, the flux of magnetic circuit is compared with which parameter of electrical circuit ?

E.m.f.

Current

Current density

Conductivity

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11.
Hard steel is suitable for making permanent magnets because_____________?

It has good residual magnetism

Its hysteresis loop has large area

Its mechanical strength is high

Its mechanical strength is low

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12.
Those materials are well suited for making permanent magnets which have ________ retentivity and _________ coercivity

Low, high

High, high

High, low

Low, low

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14.
When both the inductance and resistance of a coil are doubled the value of________________?

Time constant remains unchanged

Initial rate of rise of current is doubled

Final steady current is doubled

Time constant is halved

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15.
Energy stored by a coil is doubled when its current is increased by percent___________?

25

50

41.4

100

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