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
reverse the field connections
check armature insulation resistance
increase the field resistance

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DC Generators
Lap winding is composed of

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

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