40 Important Magnetic Circuit MCQ Question and Answer | PDF Free Download
1.The property of a material which opposes the creation of magnetic flux in it is known as
- AReluctivity
- BMagnetomotive force
- CReluctance
- DPermeance
2.The unit of retentivity is
- AWeber
- BWeber/sq.m
- CAmpere turn/metre
- DAmpere turn
3.Reciprocal of reluctance is
- AReluctivity
- BPermanence
- CPermeability
- DSusceptibility
4.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
5.The unit of reluctance is
- AMetre/henry
- BHenry/metre
- CHenry
- D1/henry
6.A ferrite core has less eddy current loss than an iron core because
- AFerrites have high resistance
- BFerrites are magnetic
- C Ferrites have low permeability
- DFerrites have high hysteresis
7.A ferromagnetic core subjected to cycles of magnetization will exhibit hysteresis when the cycle is
- ARotating
- BAlternating
- CPulsating
- DAny of the above
8.In order to minimise loss due to hysteresis, the magnetic material should have
- AHigh resistivity
- BLow hysteresis is co-efficient
- CLarge B-H loop area
- DHigh retentivity
9.Hysteresis loss least depends on
- AVolume of material
- BFrequency
- CSteinmetz co-efficient of material
- DAmbient temperature
10.In electrical machines, Laminated cores are used to reduce
- ACopper loss
- B Eddy current loss
- CHysteresis loss
- DAll of the above
11.The area of hysteresis loss is a measure of
- APermittivity
- BPermeance
- CEnergy loss per cycle
- DMagnetic flux
12.Permeance is to reluctance as conductance is to
- AAmpere turns
- BInductance
- CCapacitance
- DResitance
13.The transformer cores operating at microwave frequency range, are usually made of
- ACarbon
- BCopper
- CSilicon steels
- DFerrites