DC Generators
An exciter for a turbo generator is a

Compound generator
Series generator
Separately excited generator
Shunt generator

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

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

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