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.
 All of above.
 The accuracy in speed control is required.

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Electrical Machines
A 10 kW, 230 V, dc shunt machine has four terminals brought out through four leads. For this machine

 armature winding has thick leads whereas field winding has thin leads
 both the windings have thin leads
 armature winding has thin leads whereas field winding has thick leads
 both the windings have thick leads

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