DC Generators
Which of the following will not prevent a self excited shunt generator from building upto its full voltage?

No residual magnetism
Speed too high
Wrong direction of rotation
Open field

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

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

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