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A dc shunt generator when driven without connecting field winding shows au open-circuit terminai voltage of 12 V. When field winding is connected and excited the terminal voltage drops to zero because | |
A. | field resistance is higher than critical resistance. [Wrong Answer] |
B. | there is no residual magnetism in the field circuit. [Wrong Answer] |
C. | field winding has got wrongly connected. [Correct Answer] |
D. | there is a fault in armature circuit. [Wrong Answer] |