DC Generators
The copper loss is constant for

Series generator only
Both shunt and compound generator
None of the listed here
Shunt generator only

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

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