Electrical Engineering MCQs

Page No. 281

The rapid wear of brushes takes place due to____________?


aabrasion from dust

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b excessive spring pressure

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chigh mica insulation between com-mutation bars

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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

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bCommutator

✓


cEye bolt

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dEquilizer rings

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View Answer Commutator

Compensating windings are used in D.C. generators______________?


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

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bto provide path for the circulation of cooling air

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cto neutralise the cross-magnetising effect of the armature reaction

✓


dnone of the above

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The following constitute short-circuit in the armature winding.


aInsulation failure between two commutator bars

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bInsulation failure between two turns of a coil

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cTwo of more turns of the same coil getting grounded

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d All of the above

✓


View Answer All of the above

The number of brushes in a commutator depends on______________?


aspeed of armature

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btype of winding

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cvoltage

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damount of current to be collected

✓



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


aelectromagnets

✓


bpermanent magnets

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cboth A. and B.

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dnone of the above

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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

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c brush position has no effect on the commutator grooving

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dNone

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


areduces generator e.m.f.

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b increases armature speed

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c reduces interpoles flux density

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dresults in sparking trouble

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


a cumulatively compounded long shunt

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bdeferentially compounded long shunt

✓


ccumulatively compounded short shunt

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ddifferentially compounded short shunt

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Armature coil is short circuited by brushes when it lies_____________?


aalong neutral axis

✓


b along field axis

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cin any of the above positions

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d in none of the above positions

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View Answer along neutral axis

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