Answer / rajeevkumar

just read abt form factor....

Answer / shashidhar

Transformer Induced voltage equation contains 4.44 factor.

E=4.44*f*T*phi
E -Induced emf per phase
T -number of turns
f -frequency
phi -maximum flux per pole

From the equation we see that E is proportional to 4.4 and
it is in turn multiple of 11.
So always transmission voltage is multiple of 11

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