MAGNETIC CIRCUIT QUIZ

Reciprocal of reluctance is

Susceptibility

Permeance

Permeability

Reluctivity

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

High, high

Low, low

High, low

Low, high

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Relative permeability of vacuum is

6

5

3

1

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

Magneto-motive force

Reluctivity

Reluctance

Permeance

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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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Hysteresis loss least depends on

Volume of material

Ambient temperature

Steinmetz’s coefficient of material

Frequency

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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

500

20

50

70

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Conductivity is analogous to

Resistivity

Retentivity

Inductance

Permeability

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Silicon steel is used in electrical machines because it has

High coercivity

Low coercivity

Low hysteresis loss

Low retentivity

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The unit of reluctance is

Henry

Henry/meter

1/Henry

Meter/Henry

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