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

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

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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
So that two similar machines will pass approximately equal currents to the load
To increase the series flux
To increase the speed and hence generated e.m.f.

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