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The coil under going commutation lies along _____ while the coil getting short circuited lies along ____ for a practical dc machine.

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The coil under going commutation lies along _____ while the coil getting short circuited lies along ____ for a practical dc machine.

(a) gna, mna

(b) mna, gna

(c) gna, gna

(d) mna, mna

I got this question in semester exam.

Query is from Effect of Brush Shift and Compensation Windings topic in chapter DC Machines of Electrical Machines

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Right option is (a) gna, mna

To elaborate: In a practical dc machine, the coil undergoing commutation lies along GNA so as the brushes and the coils which actually get short circuited lies along mna. This lead to sparking as a voltage difference is created at the coils.

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