Electrical Machines
If the field circuit of a DC shunt motor is opened

 The speed of motor will be reduced.
 The armature current will reduce.
  The motor will attain dangerously high speed.
 DC Shunt Motor

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Electrical Machines
Interpoles in a DC motor must be

 Series excited and should have the same polarity as that of the ahead main pole in the direction of rotation of armature.
 Shunt excited and should have the same polarity as that of the behind main pole in the direction of rotation of armature.
 Series excited and should have the same polarity as that of the behind main pole in the direction of rotation of armature.
 Shunt excited and should have the same polarity as that of the ahead main pole in the direction of rotation of armature.

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