DC Generators
In a D.C. generator

Magnetization characteristic = external characteristic
External resistance = internal characteristic armature reaction
Internal characteristic = magnetization characteristic ohmic drop
External characteristic = magnetization characteristic ohmic drop armature reaction

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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 increase the series flux
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

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