Electrical Engineering MCQs

Page No. 181

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


aInductance


b Condenser


cVariable resistor


d Resistance


View Answer Inductance

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


ahigh, high


blow, high


chigh, low


dlow, low


View Answer high, low

A material for good magnetic memory should have____________?


a low hysteresis loss


b high permeability


clow retentivity


dhigh retentivity


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


bsmall


clarge


d none of the above


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


b20


c0.05


d500


View Answer 20

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


a at 63.2% of its maximum steady value


bat the start of the current flow


cafter one time constant


d near the final maximum value of current



Permanent magnets are normally made of_____________?


aalnico alloys


b aluminium


ccast iron


dwrought iron


View Answer alnico alloys

The unit of magnetic flux is______________?


a henry


bweber


campereturn/weber


dampere/metre


View Answer weber

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


alowers their power efficiency


b increases their cost of manufacture


cleads to their increased weight


dproduces fringing



An air gap is usually inserted in magnetic circuits to____________?


aincrease m.m.f.


b increase the flux


c prevent saturation


dnone of the above


View Answer prevent saturation

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