DC Generators
In a D.C. generator

Magnetization characteristic = external characteristic
External characteristic = magnetization characteristic ohmic drop armature reaction
Internal characteristic = magnetization characteristic ohmic drop
External resistance = internal characteristic armature reaction

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

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