1.

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 revolutionI 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

Answer»

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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