for the voltage built-up a self-excited D.C. generator, which of the following is not an essential condition. 

1.there must be some residual flux 

2.field winding mmf must aid the residual flux 

3.total field circuit resistance must be less than t critical value 

4.armature speed must be very high
in DC generator by

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for the voltage built-up a self-excited D.C. generator, which of the following is not an essential condition. 

1.there must be some residual flux 

2.field winding mmf must aid the residual flux 

3.total field circuit resistance must be less than t critical value 

4.armature speed must be very high

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