Electrical Engineering MCQs

Page No. 278

In a D.C. generator the magnetic neutral axis coincides with the geometrical neutral axis, when_______________?


athere is no load on|he generator


b the generator runs on full load


c the generator runs on overload


d. the generator runs on designed speed



In a level compounded D.C. generator, full load terminal voltage is______________?


anegligibly low


bequal to no-load terminal voltage


c more than no-load terminal voltage


dless than no-load terminal voltage



The e.m.f. generated in a D.C. generator is directly proportional to____________?


aflux/pole


b speed of armature


cnumber of poles


d all of the above


View Answer speed of armature

In D.C. generators the polarity of the interpoles_____________?


ais the same as that of the main pole ahead


b is the same as that of the immediately preceding pole


cis opposite to that of the main pole ahead


dis neutral as these poles do not play part in generating e.m.f.



In over compounded generator, full load terminal voltage is______________?


aalmost zero


bless than no load terminal voltage


cmore than no load terminal voltage


dequal to no-load terminal voltage



Permeance is the reciprocal of______________?


aflux density


breluctance


campere-turns


dresistance


View Answer reluctance

Which of the following D.C. generators will be in a position to build up without any residual magnetism in the poles?


aSeries generator


bShunt generator


cCompound generator


dNone of the above


View Answer None of the above

Which of the following generator will have negligible terminal voltage while running on no-load?


aSeries generator


bShunt generator


cCompound generator


dSeparately excited generator


View Answer Series generator

In a D.C. generator the number of mechanical degrees and electrical degrees will be the same when____________?


a r.p.m. is more than 300


b r.p.m. is less than 300


cnumber of poles is 4


dnumber of poles is 2


View Answer number of poles is 2

D.C. generator generally preferred for charging automobile batteries is______________?


aseries generator


bshunt generator


clong shunt compound generator


d any of’the above



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