Electrical Engineering MCQs

Page No. 284

If B is the flux density, I the length of conductor and v the velocity of conductor, then induced e.m.f. is given by______________?


a Blv


bBlv2


cBl2v


dBl2v2


View Answer Blv

If a D.C. generator fails to build up the probable cause could not be_____________?


a imperfect brush contact


bfield resistance less than the critical resistance


c no residual magnetism in the generator


dfaulty shunt connections tending to reduce the residual magnetism



Brushes of D.C. machines are made of_________?


a carbon


bsoft copper


chard copper


d all of above


View Answer carbon

In D.C. generators, current to the external circuit from armature is given through_____________?


acommutator


b solid connection


cslip rings


d none of above


View Answer commutator

Iron losses in a D.C. machine are independent of variations in______________?


aspeed


b load


cvoltage


d speed and voltage


View Answer load

Iron losses in a D.C. machine are independent of variations in_____________?


aspeed


bload


cvoltage


dspeed and voltage


View Answer load

The armature of D.C. generator is laminated to_______________?


areduce the bulk


bprovide the bulk


cinsulate the core


dreduce eddy current loss



Laminations of core are generally made of________________?


acase iron


bcarbon


csilicon steel


dstainless steel


View Answer silicon steel

Which of the following could be lamina-proximately the thickness of laminations of a D.C. machine ?


a 0.005 mm


b 0.05 mm


c 0.5 m


d5 m


View Answer 0.5 m

The commutator segments are connected to the armature conductors by means of___________?


acopper lugs


b resistance wires


c insulation pads


d brazing


View Answer copper lugs

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