Electrical Machines
DC Motor

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

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Electrical Machines
Two dc machines A and B, using the same conductor material, have armature circuit resistances of 0.4 Ω and 1.2 Ω respectively. Of the two machines,

 A is bigger than B for the same voltage rating
 B is bigger than A for the same current rating
 A is bigger than B for the same current rating
 both are of the same size for the same current rating

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Electrical Machines
Ward-Leonard system for controlling the speed of a DC motor is used where

 Very fine speed control over the whole range from zero to normal speed is required.
 The accuracy in speed control is required.
 All of above.
 The speed in both the direction is required.

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