Electrical Engineering MCQs

Page No. 182

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


a rapid reversals of its magnetisation


b flux density lagging behind magnetising force


cmolecular friction


dit high retentivity


View Answer it high retentivity

Hysteresis loss least depends on____________?


avolume of material


bfrequency


csteinmetz coefficient of material


dambient temperature


View Answer ambient temperature

The unit of reluctance is_____________?


a metre/henry


bhenry/metre


chenry


d1/henry


View Answer 1/henry

Reciprocal of reluctance is_______________?


a reluctivity


bpermeance


cpermeability


dsusceptibility


View Answer permeance

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


areluctivity


bmagnetomotive force


c permeance


dreluctance


View Answer reluctance

Silicon steel is used in electrical machines because it has_____________?


alow coercivity


b low retentivity


clow hysteresis loss


dhigh coercivity


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


cferrites have low permeability


dferrites have high hysteresis



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


acopper loss


beddy current loss


chysteresis loss


dall of the above


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.


bCurrent


cCurrent density


dConductivity


View Answer Current

The unit of retentivity is____________?


aweber


bweber/sq. m


campere turn/meter


dampere turn


View Answer weber/sq. m

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