DC Generators
An exciter for a turbo generator is a

Compound generator
Series generator
Shunt generator
Separately excited generator

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

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

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