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.Management Sciences
Category: Magnetic Circuit
Those magnetic materials are best suited for making armature and transformer cores which have ________ permeability and ________ hystersis loss
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A. high, high
B. low, high
C. high, low
D. low, low
A material for good magnetic memory should have____________?
A. low hysteresis loss
B. high permeability
C. low retentivity
D. high retentivity
The rate of rise of current through an inductive coil is maximum_____________?
A. at 63.2% of its maximum steady value
B. at the start of the current flow
C. after one time constant
D. near the final maximum value of current
Permeability in a magnetic circuit corresponds to________ in an electric circuit
A. resistance
B. resistivity
C. conductivity
D. conductance
Laminated cores, in electrical machines, are used to reduce____________?
A. copper loss
B. eddy current loss
C. hysteresis loss
D. all of the above
The property of a material which opposes the creation of magnetic flux in it is known as_____________?
A. reluctivity
B. magnetomotive force
C. permeance
D. reluctance
In a magnetic material hysteresis loss takes place primarily due to___________?
A. rapid reversals of its magnetisation
B. flux density lagging behind magnetising force
C. molecular friction
D. it high retentivity
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