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Nature of the flux density wave in the air gap is__________ (for armature current equal to 0)

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Nature of the flux density wave in the air gap is__________ (for armature current equal to 0)

(a) Flat topped with quarter wave symmetry

(b) Point topped with quarter wave symmetry

(c) Flat topped with half wave symmetry

(d) Point topped with half wave symmetry

This question was addressed to me in class test.

The question is from EMF and Torque Production topic in section Circuit Model, Emf and Torque of DC Machines

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The correct choice is (a) Flat topped with quarter wave symmetry

To elaborate: In a DC machine magnetic structure is such that the flux density wave in the air gap is flat topped with quarter wave symmetry as long as armature current is equal to 0. For non-zero value of armature current, this quarter wave symmetry is disturbed because of armature reaction.

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