Electrical Machines
Dynamic braking is very effective for

 separately excited motors.
 differential compound motors.
 shunt motors.
 series motors.

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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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Electrical Machines
The synchronous reactance( Xs) is the

 reactance due to leakage flux
 combined reactance due to armature reaction and leakage flux
 reactance due to armature reaction of the machine
 reactance either due to armature reaction or leakage flux

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