DC Generators
For a D.C. machines laboratory following type of D.C. supply will be suitable

Induction motor D.C. generator set
Mercury are rectifier
Synchronous motor D.C. generator set
Rotary converter

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DC Generators
In a D.C. generator

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

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