Electrical Engineering MCQs

Page No. 276

Shunt generators are most suited for stable parallel operation because of their______________?


arising voltage characteristics


b identical voltage characteristics


cdrooping voltage characteristics


d linear voltage characteristics



As a result of armature reaction, the reduction in the total mutual air gap flux in a D.C. generator is approximately______________?


a 40 percent


b 25 percent


c10 percent


d5 percent


View Answer 5 percent

The critical resistance of the D.C. generator is the resistance of_____________?


afield


bbrushes


carmature


d load


View Answer field

The series field of a short-shunt D.C. generator is excited by_______________?


aexternal current


b armature current


cshunt current


dload current


View Answer load current

In a separately excited generator supplying rated load the armature reaction.


ais always present


bis always absent


cmay be sometimes present


dnone of the above


View Answer is always present

For both lap and wave windings, there are as many commutator bars as the number of_____________?


aslots


barmature conductors


c winding elements


dpoles


View Answer winding elements

Wave winding is composed of_______________?


aany even number of conductors


b any odd number of conductors


cthat even number which is exact multiple of poles + 2


dthat even number which is exact multiple of poles



The number of armature parallel paths in a two-pole D.C. generator having duplex lap winding is______________?


a2


b4


c6


d8


View Answer 4

In a D.C. generator:___________________?


aexternal resistance = internal char-acteristic – armature reaction


binternal characteristic = magnetisation characteristic – ohmic drop


cexternal characteristic = magnetisation characteristic – ohmic drop – armature reaction


dmagnetisation characteristic = external characteristic



In a D.C. generator the critical resistance can be increased by_____________?


aincreasing its field resistance


bdecreasing its field resistance


cincreasing its speed


ddecreasing its speed


View Answer increasing its speed

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