DC Generators
The purpose of providing dummy coils in a generator is

To reduce eddy current losses
To enhance flux density
To amplify voltage
To provide mechanical balance for the rotor

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DC Generators
Inter-pole flux should be sufficient to

Neutralize both the armature reaction flux as well as commutating e.m.f. induced in the coil
None of these
Neutralize the commutating self induced e.m.f.
Neutralize the armature reaction flux

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

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

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