Electrical Engineering MCQs

Page No. 279

In case of a flat compounded generator:


a voltage generated is less than the rated voltage


bgenerated voltage is proportional to the load on the generator


cvoltage remains constant irrespective of the load


d speed varies in proportion to the load on the generator



Interpole flux should be sufficient to_____________?


aneutralise the commutating self induced e.m.f.


bneutralise the armature reaction flux


cneutralise both the armature reaction flux as well as commutating e.m.f. induced in the coil


dperform none of the above functions



Following D.C. generator will be in a position to build up without any residual magnetism in the poles______________?


aseries generator


b shunt generator


ccompound generator


dself-excited generator



An exciter for a turbo generator is a_____________?


aseparately excited generator


b shunt generator


cseries generator


d compound generator


View Answer shunt generator

D.C. series generator is used_________________?


ato supply traction load


bto supply industrial load at constant voltage


cvoltage at the toad end of the feeder


dfor none of the above purpose



In a D.C. generator in case the resistance of the field winding is increased, then output voltage will____________?


aincrease


b decrease


cremain unaffected


dfluctuate heavily


View Answer decrease

For the parallel operation of two or more D.C. compound generators, we should ensure that_______________?


avoltage of the incoming generator should be same as that of bus bar


bpolarity of incoming generator should be same as that of bus bar


call the series fields should be run in parallel by means of equilizer connection


dseries fields of all generators should be either on positive side or negative side of the armature



Open circuited armature coil of a D.C. machine is________________?


a identified by the scarring of the commutator segment to which open circuited coil is connected


b indicated by a spark completely around the commutator


cboth A. and (b)


dnone of the above


View Answer both A. and (b)

Lap winding is composed of_____________?


aany even number of conductors


bany odd number of conductors


cthat even number which is exact multiple of poles + 2


d that even number which is exact multiple of poles



Satisfactory commutation of D.C. machines requires______________?


a brushes should be of proper grade and size


bbrushes should smoothly run in the holders


c smooth, concentric commutator properly undercut


dall of the above


View Answer all of the above

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