DC Generators
If the value of shunt field resistance of a shunt generator is greater than the critical resistance, the generator will

Fail to excite
Excite to one half of full voltage
Excite to full voltage
None of the listed here

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

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

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