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Magnetic Circuit

Magnetic Circuit
Relative permeability of vacuum is

6
1
5
3

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Magnetic Circuit
The unit of retentivity is

Ampere turns
Ampere turn/meter
Weber
Weber/sq. m

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Magnetic Circuit
Silicon steel is used in electrical machines because it has

Low hysteresis loss
High coercivity
Low retentivity
Low coercivity

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Magnetic Circuit
Hysteresis loss least depends on

Volume of material
Steinmetz’s coefficient of material
Ambient temperature
Frequency

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Magnetic Circuit
Permeability in a magnetic circuit corresponds to_________ in an electric circuit.

Resistance
Resistivity
Conductance
Conductivity

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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, high
High, low
Low, low
High, high

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