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In D.C. machines, in order to prevent excessive distortion of field form by the armature reaction, the field rrimf must be made | |
A. | equal to that of armature mmf [Wrong Answer] |
B. | less in comparison with the armature mmf [Wrong Answer] |
C. | large in comparison with the armature mmf [Correct Answer] |
D. | none of the above [Wrong Answer] |