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A dc shunt gener at or when driven without connecting field winding shows as open circuit terminal voltage of 12 V. When field winding is connected and excited the terminal voltage drops to zero because
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- field resistance is higher than critical resistance
- there is no residual magnetism in the field circuit
- field winding has got wrongly connected
- there is a fault in armature circuit
Correct Option: C
The wrongly connected field circuit can destroy the residual magnetism.
