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

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

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Electrical Machines
The speed of a DC series motor is

 Inversely proportional to the armature current.
 Proportional to field current.
 Proportional to the armature current.
 Proportional to the square of the armature current.

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