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

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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

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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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