Electrical Engineering MCQs

Page No. 182

In a magnetic material hysteresis loss takes place primarily due to___________?


a rapid reversals of its magnetisation

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b flux density lagging behind magnetising force

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cmolecular friction

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dit high retentivity

✓


View Answer it high retentivity

Hysteresis loss least depends on____________?


avolume of material

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bfrequency

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csteinmetz coefficient of material

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dambient temperature

✓


View Answer ambient temperature

The unit of reluctance is_____________?


a metre/henry

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bhenry/metre

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chenry

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d1/henry

✓


View Answer 1/henry

Reciprocal of reluctance is_______________?


a reluctivity

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bpermeance

✓


cpermeability

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dsusceptibility

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View Answer permeance

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


areluctivity

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bmagnetomotive force

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c permeance

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dreluctance

✓


View Answer reluctance

Silicon steel is used in electrical machines because it has_____________?


alow coercivity

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b low retentivity

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clow hysteresis loss

✓


dhigh coercivity

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View Answer low hysteresis loss

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


a ferrites have high resistance

✓


b ferrites are magnetic

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cferrites have low permeability

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dferrites have high hysteresis

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


acopper loss

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beddy current loss

✓


chysteresis loss

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dall of the above

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View Answer eddy current loss

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


aE.m.f.

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bCurrent

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cCurrent density

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dConductivity

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View Answer Current

The unit of retentivity is____________?


aweber

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bweber/sq. m

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campere turn/meter

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dampere turn

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View Answer weber/sq. m

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