DC Generators
Due to armature reaction, the main pole flux of a dc generator is

Weakend only
Weakened as well as distorted
None of the listed here
Distorted only

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

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

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DC Generators
In a D.C. generator

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

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