Electrical Machines
In dc machine armature windings are placed on rotor because of the necessity for

 commutation.
 development of torque.
 generation of voltage.
 electromechanical energy conversion.

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Electrical Machines
The synchronous reactance( Xs) is the

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

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