Electrical Machines
For a given torque, reducing diverter resistance of a DC series motor causes

 decrease in speed but armature current remains the same.
 decrease in speed demanding less armature current.
 increase in speed demanding more armature current.
 increase in speed but armature currnet remains the same.

ANSWER DOWNLOAD EXAMIANS APP

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

ANSWER DOWNLOAD EXAMIANS APP