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Electrical Engineering Objective Questions { Electromagnetism }

225. Reciprocal of reluctance is
A. reluctivity
B. perrneance
C. permeability
D. susceptibility
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226. While comparing magnetic and electric circuits, the flux of magnetic circuit is compared with which parameter of electrical circuit?
A. E.m.f
B. Current
C. Current density
D. Conductivity
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227. The unit of reluctance is
A. metre/henry
B. henry/metre
C. henry
D. Uhenty
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228. A ferritecore has less eddy current loss than an iron core because
A. ferrites have high resistance
B. ferrites are magnetic
C. ferrites have low permeability
D. ferrites have high hysteresis
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229. A ferromagnetic core subjected to cycles of magetisation will exhibit hysteresis when the cycle is
A. rotating
B. alternating
C. pulsating
D. any of the above
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230. In order to minimise loss due to hysteresis, the magnetic material should have
A. high resistivity
B. low hysteresis co-efficient
C. large B-H loop area
D. high retentivity
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231. Hysteresis loss least depends on
A. volume of material
B. frequency
C. Steinmetz co-efficient of material
D. ambient temperature
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