Electrical Machines
A crusher is equipped with

 Synchronous motor.
 Reluctance motor.
 Slip ring induction motor.
 DC shunt motor.

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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 speed in both the direction is required.
 The accuracy in speed control is required.
 All of above.

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