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

 development of torque.
 generation of voltage.
 commutation.
 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
 combined reactance due to armature reaction and leakage flux
 reactance either due to armature reaction or leakage flux

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Electrical Machines
An ideal synchronous motor has no starting torque because

 relative velocity between the stator and rotor mmf’s is zero.
 rotor is made up of salient poles.
 rotor winding is highly reactive.
  relative velocity between stator and rotor mmf’s is not zero.

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