Electrical Machines
A DC series motor must started on no load because it would

  Run at dangerously high speed.
 Draw more current without producing sufficient torque.
 Fail to start without load.
 Not develop starting torque.

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Electrical Machines
DC Motor

  dc series motor.
  dc shunt motor with field weakening.
  dc shunt with armature resistance control.
  dc compound motor.

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