A dc shunt generator when driven without connecting field winding shows an open-circuit terminal 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.
B. there is no residual magnetism in the field circuit.
C. field winding has got wrongly connected.
D. there is a fault in armature circuit.
Answer:C
A dc shunt generator when driven without connecting field winding shows an open-circuit terminal 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. B. there is no residual magnetism in the field circuit. C. field winding has got wrongly connected. D. there is a fault in armature circuit.