Electrical Machines
If in DC Shunt Motor the flux is reduced suddenly to zero, then

 the motor will attain dangerously high speed.
 the speed of motor will be reduced.
 the armature current will reduce.
 the motor will come to stop.

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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.
 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 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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Electrical Machines
In a DC machine the armature mmf is

 rotating with respect to field poles.
  rotating with respect to field poles as well as armature.
  stationary with respect to field poles.
  stationary with respect to armature.

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