Electrical Machines
If the frequency of input voltage of a transformer is increased keeping the magnitude of voltage unchanged, then

 both hysteresis loss(Ph) and eddy current loss(Pe) will increase
 Ph will increase but Pe will decrease
 Ph will decrease but Pe will remain same
 Pe will increase but Ph will decrease

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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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