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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