MAGNETIC CIRCUIT QUIZ

Conductivity is analogous to

Inductance

Permeability

Resistivity

Retentivity

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The unit of reluctance is

Meter/Henry

Henry

1/Henry

Henry/meter

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

At 63.2% of its maximum steady value

At the start of the current flow

Near the final maximum value of current

After one time constant

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

Conductance

Resistance

Conductivity

Resistivity

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Those magnetic materials are best suited for making armature and transformer cores which have permeability and _hysteresis loss.

High, low

Low, high

Low, low

High, high

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Hysteresis loss least depends on

Frequency

Steinmetz’s coefficient of material

Volume of material

Ambient temperature

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Reciprocal of reluctance is

Susceptibility

Permeability

Permeance

Reluctivity

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

Low, high

Low, low

High, low

High, high

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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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The relative permeability of a ferromagnetic material is

Less than one

More than one

More than 10

More than 100 Ωr 1000

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