Electrical Engineering MCQs

Page No. 281

The rapid wear of brushes takes place due to____________?


aabrasion from dust


b excessive spring pressure


chigh mica insulation between com-mutation bars


dall of the above factors



Which of the following components of a D.C, generator plays vital role for providing direct current of a D.C. generator ?


aDummy coils


bCommutator


cEye bolt


dEquilizer rings


View Answer Commutator

Compensating windings are used in D.C. generators______________?


amainly to reduce the eddy currents by providing local short-circuits


bto provide path for the circulation of cooling air


cto neutralise the cross-magnetising effect of the armature reaction


dnone of the above



The following constitute short-circuit in the armature winding.


aInsulation failure between two commutator bars


bInsulation failure between two turns of a coil


cTwo of more turns of the same coil getting grounded


d All of the above


View Answer All of the above

The number of brushes in a commutator depends on______________?


aspeed of armature


btype of winding


cvoltage


damount of current to be collected



Magnetic field in a D.C. generator is produced by_______________?


aelectromagnets


bpermanent magnets


cboth A. and B.


dnone of the above


View Answer electromagnets

To avoid formation of grooves in the commutator of a D.C. machine?


athe brushes of opposite polarity should track each other


b the brushes of same polarity should track each other


c brush position has no effect on the commutator grooving


dNone



The demagnetising component of armature reaction in a D.C. generator___________?


areduces generator e.m.f.


b increases armature speed


c reduces interpoles flux density


dresults in sparking trouble



A cumulatively compounded long shunt generator when operating as a motor would be____________?


a cumulatively compounded long shunt


bdeferentially compounded long shunt


ccumulatively compounded short shunt


ddifferentially compounded short shunt



Armature coil is short circuited by brushes when it lies_____________?


aalong neutral axis


b along field axis


cin any of the above positions


d in none of the above positions


View Answer along neutral axis

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