| 1. | Laminated cores, in electrical machines, are used to reduce ? | |
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copper loss
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eddy current loss
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hysteresis loss
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all of the above
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Report Question| 2. | Reciprocal of reluctance is ? | |
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reluctivity
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permeance
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permeability
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susceptibility
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| 3. | The transformer cores operating at microwave frequency range, are usually made of ? | |
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carbon
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copper
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silicon steels
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ferrites
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| 4. | If the area of hysteresis loop of a material is large, the hysteresis loss in this material will be ? | |
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zero
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small
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large
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none of the above
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| 5. | The unit of retentivity is ? | |
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weber
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weber/sq. m
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ampere turn/metre
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ampere turn
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| 6. | A material for good magnetic memory should have ? | |
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low hysteresis loss
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high permeability
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low retentivity
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high retentivity
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| 7. | The unit of reluctance is ? | |
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metre/henry
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henry/metre
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henry
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1/henry
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| 8. | The property of a material which opposes the creation of magnetic flux in it is known as ? | |
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reluctivity
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magnetomotive force
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permeance
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reluctance
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| 9. | Hysteresis loss least depends on ? | |
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volume of material
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frequency
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steinmetz coefficient of material
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ambient temperature
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| 10. | Conductivity is analogous to ? | |
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retentivity
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resistivity
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permeability
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inductance
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