Electrical Machines
Which of the following represents the rotating losses of machine?

 Friction and windage losses
 Eddy current losses
 Hysteresis losses
 All of the them

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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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