The voltage current characteristics of compound generators are shown in figure.

Compound dc generator depending upon the number of series field turns, the cumulatively compounded may be 

Overcompounded
Flat compounded , and 
Undercompounded 

Overcompounded:  the generator full load terminal voltage  is higher than the no-load terminal voltage.

Flat compounded(Level compounded):  The terminal voltage of generator at full load is equal to the no-load terminal voltage.

Undercompounded:  the generator terminal voltage at full load  is less than the no-load terminal voltage.

In differential compounded generators, the terminal voltage drops very quickly with increasing armature current. 

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