A self excited dc shunt generator driven by its prime mover at the rated speed fails to build up voltage across its terminals at no load. What reason can be assigned for this?
A. The field circuit resistance is higher than the critical resistance.
B. The initial shunt field mmf does not assist the residual magnetism.
C. One of the interpole connection is reversed.
D. The brush-axis shifts slightly from the geometrical neutral axis of the machine.
Answer:B
A self excited dc shunt generator driven by its prime mover at the rated speed fails to build up voltage across its terminals at no load. What reason can be assigned for this?
A. The field circuit resistance is higher than the critical resistance. B. The initial shunt field mmf does not assist the residual magnetism. C. One of the interpole connection is reversed. D. The brush-axis shifts slightly from the geometrical neutral axis of the machine.