DC Generators
Shunt generators are most suited for stable parallel operation because of their

linear voltage characteristics
drooping voltage characteristics
identical voltage characteristics
rising voltage characteristics

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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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