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A synchronous machine with its field winding on stator and polyphase armature winding on rotor. At steady state, its air gap field is?

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A synchronous machine with its field winding on stator and polyphase armature winding on rotor. At steady state, its air gap field is?

(a) stationary w.r.t. stator

(b) rotating at double the speed Ns w.r.t. rotor

(c) rotating in direction opposite to rotor

(d) all of the mentioned

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Origin of the question is Synchronous Machine Applications in chapter Synchronous Machines of Electrical Machines

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Right choice is (d) all of the mentioned

To elaborate: All are correct.

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