DC Generators
Magnetic field in a D.C. generator is produced by

Both (A) and (B)
Electromagnets
Permanent magnets
None of these

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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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