MAGNETIC CIRCUIT QUIZ

Hysteresis loss least depends on

Ambient temperature

Frequency

Volume of material

Steinmetz’s coefficient of material

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

Low, low

High, high

High, low

Low, high

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Silicon steel is used in electrical machines because it has

Low hysteresis loss

Low retentivity

Low coercivity

High coercivity

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While comparing magnetic and electric circuits, the flux of magnetic circuit is compared with which parameter of electrical circuit?

Current density

E.M.F

Conductivity

Current

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Energy stored by a coil is doubled when its current is increased by percent.

44.6

47.5

42.5

41.4

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Point out the wrong statement. Magnetic leakage is undesirable in electric machines because it

Increases their cost of manufacture

Leads to their increased weight

Lowers their power efficiency

Produces fringing

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The unit of reluctance is

1/Henry

Henry/meter

Henry

Meter/Henry

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Ferrites have high hysteresis

Ferrites have high resistance

Ferrites have high resistance

Ferrites have low permeability

None of the listed here

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In a magnetic material hysteresis loss takes place primarily due to

Flux density lagging behind magnetizing force

It high retentivity

Rapid reversals of its magnetization

Molecular friction

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

Reluctance

Permeance

Magneto-motive force

Reluctivity

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