Discussion
For a 4-pole DC machine having duplex lap winding, total number of parallel paths between the brushes are ______.
Answer: C
A 4-pole machine with a duplex lap winding has 8 parallel paths between the brushes. In a lap winding the number of parallel paths is equal to the number of poles multiplied by the multiplicity of the winding.
\[ A = mP = 2 \times 4 = 8 \]
A simple lap winding would give 4 paths and a duplex wave winding would give 4 paths too (2 times 2). The value 2 is for a simple wave winding and 16 is not the value for this winding. So the third option is correct.
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