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Magnetic Circuit

Magnetic Circuit
The unit of magnetic flux is

Weber
Ampere-turn/weber
Henry
Ampere/metre

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Magnetic Circuit
An air gap is usually inserted in magnetic circuits to

Increase the flux
Increase m.m.f.
Prevent saturation
None of the listed here

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Magnetic Circuit
Relative permeability of vacuum is

5
3
6
1

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

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

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Magnetic Circuit
The property of a material which opposes the creation of magnetic flux in it is known as

Magneto-motive force
Permeance
Reluctivity
Reluctance

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

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

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MORE MCQ ON Magnetic Circuit

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