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Magnetic Circuit

Magnetic Circuit
The initial rate of rise of current through a coil of inductance 10 H when suddenly connected to a D.C. supply of 200 V is ___________Vs

70
20
50
500

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Magnetic Circuit
In a magnetic material hysteresis loss takes place primarily due to

Flux density lagging behind magnetizing force
It high retentivity
Rapid reversals of its magnetization
Molecular friction

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Magnetic Circuit
The unit of magnetic flux is

Henry
Ampere/metre
Weber
Ampere-turn/weber

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Magnetic Circuit
Those magnetic materials are best suited for making armature and transformer cores which have ________permeability and _________hysteresis loss.

Low, low
Low, high
High, high
High, low

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Magnetic Circuit
Conductance is analogous to

Inductance
Flux
Reluctance
Permeance

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Magnetic Circuit
When both the inductance and resistance of a coil are doubled the value of

Time constant is halved
Initial rate of rise of current is doubled
Time constant remains unchanged
Final steady current is doubled

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