Electrical Engineering MCQs

Page No. 280

In a D.C. machine stray loss is the sum of_____________?


atotal copper loss and mechanical loss


b armature copper loss and iron loss


cshunt field copper loss and mechanical loss


diron loss and mechanical loss



The armature core of a D.C. generator is usually made of__________________?


asilicon steel


bcopper


cnon-ferrous material


dcast-iron


View Answer silicon steel

In any rotating machine that part which houses the conductors and in which e.m.f. induced is to be utilized is called____________?


a rotor


bstator


cfield


darmature


View Answer armature

The e.m.f. generated by a shunt wound D.C. generator isE. Now while pole flux remains constant, if the speed of the generator is doubled, the e.m.f. generated will be_______________?


aE/2


b2E


cslightly less than E


d E


View Answer 2E

A D.C. generator can be considered as____________?


arectifier


bprimemover


crotating amplifier


dpower pump


View Answer rotating amplifier

The voltage drop for which of the following types of brush can be expected to be least ?


aGraphite brushes


bCarbon brushes


c Metal graphite brushes


dNone of the above



Number of tappings for each equalizer ring is equal to_____________?


anumber of pole pairs


bnumber of poles


cnumber of parallel paths


dnumber of commutator segments


View Answer number of pole pairs

Two generators A and B have 6-poles each. Generator A has wave wound armature while generator B has lap wound armature. The ratio of the induced e.m.f. is generator A and B will be_______________?


a2 : 3


b3 : 1


c3 : 2


d1 : 3


View Answer 3 : 1

In D.C. generators, lap winding is used for______________?


ahigh voltage, high current


blow voltage, high current


c high voltage, low current


dlow voltage, low current



In a D.C. generator the ripples in the direct e.m.f. generated are reduced by_____________?


ausing conductor of annealed copper


busing commutator with large number of segments


cusing carbon brushes of superior quality


dusing equiliser rings



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