A 4-pole generator with 16 coils has a
two layer lap winding. The pole pitch is
32
16
8
4
8
Here,
the winding is done of two layers with 16 coils.
Thus,
the total number of conductor = 2 
16 = 32
Hence,
the pole pitch of a DC generator is the ratio of the total number of the
conductor to the number of poles.
Hence,
the correct option is (C).
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