DC Motors
For the same H.P. rating and full load speed, following motor has poor starting torque

Series
Shunt
Differentially compounded
Cumulatively compounded

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DC Motors
If a D.C. shunt motor is working at no load and if shunt field circuit suddenly opens

Nothing will happen to the motor
Motor will run at very slow speed
This will result in excessive speed, possibly destroying armature due to excessive centrifugal stresses
This will make armature to take heavy current, possibly burning it

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