Electrical Machines
Which of the following is done in speed control of DC motor by field flux control?

 Any of above.
 Inserting an additional resistance in the armature circuit.
 Inserting an additional resistance in the field circuit.
 Inserting resistance to armature circuit and field circuit.

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

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

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