Electrical Machines
Armature coil is short circuited by brushes when it lies

  in none of above positions.
  along field axis.
  along neutral axis.
  in any of above positions.

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Electrical Machines
When the supply terminal of a DC shunt motor are interchanged

  The motor will run at its normal speed in the same direction as before.
 The direction of rotation will reverse.
 The motor will stop.
 The motor will run much faster in the same direction.

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