Electrical Machines
DC Motor

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

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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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Electrical Machines
With the increase in speed of a DC motor

 both back emf as well as line current increase.
 back emf falls and line current increases.
 both back emf as well as line current fall.
 back emf increases but line current falls.

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