Electrical Machines
Which of the following machine will have maximum efficiency?

  Electrical power transformer.
 Electrical power generator.
 Induction motor.
 DC motor.

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

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