DC Generators
In a cummulative compounded generator the shunt and series fields ______ each other.

Aid
None of the listed here
Oppose
Sometime aid, sometime oppose

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

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

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