DC Motors
Three point starter can be used for

Both shunt and compound motor
Series motor only
Compound motor only
Shunt motor only

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DC Motors
If a D.C. shunt motor is working at full load and if shunt field circuit suddenly opens

Nothing will happen to motor
This will result in excessive speed, possibly destroying armature due to excessive centrifugal stresses
Motor will come to stop
This will make armature to take heavy current, possibly burning it

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