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Magnetic Circuit

Magnetic Circuit
If the area of hysteresis loop of a material is large, the hysteresis loss in this material will be

Large
None of the listed here
Small
Zero

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Magnetic Circuit
Hysteresis loss least depends on

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

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Magnetic Circuit
The rate of rise of current through an inductive coil is maximum

At the start of the current flow
At 63.2% of its maximum steady value
After one time constant
Near the final maximum value of current

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

Low coercivity
Low retentivity
High coercivity
Low hysteresis loss

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Magnetic Circuit
Those materials are well suited for making permanent magnets which have ________ retentivity and ________ coercivity.

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

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Magnetic Circuit
The unit of reluctance is

Meter/Henry
Henry/meter
1/Henry
Henry

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