DC Generators
In a D.C. generator the magnetic neutral axis coincides with the geometrical neutral axis, when

The generator runs on overload
The generator runs on designed speed
The generator runs on full load
There is no load on the generator

ANSWER DOWNLOAD EXAMIANS APP

DC Generators
When two D.C. series generators are running in parallel, an equalizer bar is used

To increase the series flux
To reduce the combined effect of armature reaction of both machines
So that two similar machines will pass approximately equal currents to the load
To increase the speed and hence generated e.m.f.

ANSWER DOWNLOAD EXAMIANS APP