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The axis along which no emf is produced in the armature conductors is called as ____________

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The axis along which no emf is produced in the armature conductors is called as ____________

(a) Geometrical Neutral Axis (GNA)

(b) Magnetic Neutral Axis (MNA)

(c) Axis of rotation

(d) Axis of revolution

I have been asked this question by my college professor while I was bunking the class.

I'd like to ask this question from Dynamics of Motor-Load Combination topic in section Dynamics of Electrical Drives of Electric Drives

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Correct choice is (b) Magnetic Neutral Axis (MNA)

To elaborate: The coil undergoing commutation must lie along the magnetic neutral axis so that no emf is induced and there is no sparking at the time of commutation.

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