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

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

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DC Generators
Lap winding is composed of

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

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