DC Generators
D.C. generator generally preferred for charging automobile batteries is

Series generator
Shunt generator
Any of the above
Long shunt compound generator

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

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

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