Electrical Machines
Open circuit in a transformer is prefered with

 direct current
 rated transformer current
 high frequency supply
 rated transformer voltage

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Electrical Machines
The synchronous reactance( Xs) is the

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

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Electrical Machines
An ideal synchronous motor has no starting torque because

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

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