Answer Posted / soumya ranjan mania

Dear friends,for your kind information form factor of full
sine wave is infinite,but it is 1.11 for halfwave,how
halfwave formfactor is related to our topic,as we need
fullsine wave so form factor has no related to generation of
voltage multiple of 11,so only answer is only the historical
perspective ie In early days when technology has not
advanced this much,the transmission lines consumes around
10% of the totalpower transferred. Normally loads are
designed as multiples of 10 or 100 KW. So the generation
done for required load power + transmission loss. ie 11KW,
110KW etc. So generated voltage also was designed as
multiples of 11.

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