Related Questions

If the area of hysteresis loop of a material is large, the hysteresis loss in this material will be
A Zero
B Small
C Large
D None of the above
No eddy current and hysteresis losses occur in
A Electrostatic instruments
B PMMC instruments
C Moving iron instruments
D Electrodynamo meter instruments
A ferrite core 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
In a magnetic material hysteresis loss takes place primarily due to
A Rapid reversals of its magnetization
B Flux density lagging behind magnetizing force
C Molecular friction
D It high retentivity
Which of the following steps is likely to result in reduction of hysteresis loss in a D.C. generator?
A Providing laminations in armature core
B Providing laminations in stator
C Using nonmagnetic material for frame
D Using material of low hysteresis coefficient for armature core material
The hysteresis loss in a D.C. machine least depends on
A Frequency of magnetic reversals
B Maximum value of flux density
C Volume and grade of iron
D Rate of flow of ventilating air
Hysteresis loss least depends on
A Volume of material
B Frequency
C Steinmetz’s coefficient of material
D Ambient temperature
The disc of an instrument using eddy current damping should be of
A conducting and magnetic material
B non-conducting and magnetic material
C conducting and non-magnetic material
D none of the above
Which of the fpllowing inductor will have the least eddy current losses ?
A Air core
B Laminated iron core
C Iron core
D Powdered iron core
Which of the following inductor will have the least eddy current losses?
A Air core
B Laminated iron core
C Iron core
D Powdered iron core

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