DC Generators
If a self excited D.C. generator after being installed, fails to build up on its first trial run, the first thing to do is to

increase the speed of primemover
increase the field resistance
reverse the field connections
check armature insulation resistance

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DC Generators
Lap winding is composed of

That even number which is exact multiple of poles + 2
That even number which is exact multiple of poles
Any even number of conductors
Any odd number of conductors

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DC Generators
In D.C. generators the polarity of the interpoles

Is the same as that of the immediately preceding pole
Is the same as that of the main pole ahead
Is neutral as these poles do not play part in generating e.m.f.
Is opposite to that of the main pole ahead

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