Electrical Engineering MCQs

Page No. 181

Which of the following circuit element stores energy in the electromagnetic field ?


aInductance

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b Condenser

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cVariable resistor

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d Resistance

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View Answer Inductance

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


ahigh, high

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blow, high

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chigh, low

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dlow, low

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View Answer high, low

A material for good magnetic memory should have____________?


a low hysteresis loss

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b high permeability

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clow retentivity

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dhigh retentivity

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View Answer high retentivity

If the area of hysteresis loop of a material is large, the hysteresis loss in this material will be____________?


a zero

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bsmall

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clarge

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d none of the above

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View Answer large

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


a 50

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b20

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c0.05

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d500

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View Answer 20

The rate of rise of current through an inductive coil is maximum_____________?


a at 63.2% of its maximum steady value

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bat the start of the current flow

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cafter one time constant

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d near the final maximum value of current

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Permanent magnets are normally made of_____________?


aalnico alloys

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b aluminium

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ccast iron

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dwrought iron

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View Answer alnico alloys

The unit of magnetic flux is______________?


a henry

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bweber

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campereturn/weber

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dampere/metre

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View Answer weber

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


alowers their power efficiency

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b increases their cost of manufacture

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cleads to their increased weight

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dproduces fringing

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An air gap is usually inserted in magnetic circuits to____________?


aincrease m.m.f.

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b increase the flux

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c prevent saturation

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dnone of the above

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View Answer prevent saturation

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