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DC Generators - Interview Questions and Answers

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76. A shunt generator running at 1000 r.p.m. has generated e.m.f. as 200 V. If the speed increases to 1200 r.p.m., the generated e.m.f. will be nearly
A. 150 V
B. 175 V
C. 240 V
D. 290 V
Explanation:
77. A cumulatively compounded long shunt generator when operating as a motor would be
A. cumulatively compounded long shunt
B. differentially compounded long shunt
C. cumulatively compounded short shunt
D. differentially compounded short shunt
Explanation:
78. To achieve sparkless commutation brushes of a D.C. generator are rockedm ahead so as to bring them
A. just ahead of magnetic neutral axis
B. in magnetic neutral axis
C. just behind the magnetic neutral axis
D. just ahead of magnetic neutral axis
Explanation:
79. The field coils of D.C. generator are usually made of
A. mica
B. copper
C. cast iron
D. carbon
Explanation:
80. Following D.C. generator will be in a position to build up without any residual magnetism in the poles
A. series generator
B. shunt generator
C. compound generator
D. self-excited generator
Explanation:
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